WHITING PETROLEUM CORP - FORM 8-K - EX-1.1

Attached files

file	filename
8-K - FORM 8-K - WHITING PETROLEUM CORP	d596808d8k.htm
EX-4.1 - EX-4.1 - WHITING PETROLEUM CORP	d596808dex41.htm
EX-4.2 - EX-4.2 - WHITING PETROLEUM CORP	d596808dex42.htm
EX-4.4 - EX-4.4 - WHITING PETROLEUM CORP	d596808dex44.htm
EX-4.3 - EX-4.3 - WHITING PETROLEUM CORP	d596808dex43.htm
EX-5.1 - EX-5.1 - WHITING PETROLEUM CORP	d596808dex51.htm
EX-12.1 - EX-12.1 - WHITING PETROLEUM CORP	d596808dex121.htm

Exhibit 1.1

Execution Version

WHITING PETROLEUM CORPORATION

(a Delaware corporation)

$1,100,000,000 Aggregate Principal Amount of

5.000% Senior Notes due 2019

$800,000,000 Aggregate Principal Amount of

5.750% Senior Notes due 2021

UNDERWRITING AGREEMENT

Dated: September 9, 2013

WHITING PETROLEUM CORPORATION

(a Delaware corporation)

$1,100,000,000 Aggregate Principal Amount of

5.000% Senior Notes due 2019

$800,000,000 Aggregate Principal Amount of

5.750% Senior Notes due 2021

UNDERWRITING AGREEMENT

September 9, 2013

WELLS FARGO SECURITIES, LLC

as Representative of the several Underwriters

WELLS FARGO SECURITIES, LLC

375 Park Avenue

5th Floor

New York, NY 10152

Ladies and Gentlemen:

Whiting Petroleum Corporation, a Delaware corporation (the “Company”) confirms its agreement with Wells Fargo Securities, LLC (“Wells Fargo Securities”), each of the other Underwriters named in Schedule A hereto (collectively, the “Underwriters”, which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for whom Wells Fargo Securities is acting as representative (in such capacity, the “Representative”), with respect to the issue and sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective principal amount of the Company’s 5.000% Senior Notes due 2019 (the “2019 Notes”) and 5.750% Senior Notes due 2021 (the “2021 Notes” and, collectively with the 2019 Notes, the “Notes”), set forth in said Schedule A. The Notes will be guaranteed (collectively, the “Guarantees”) by Whiting Oil and Gas Corporation (the “Guarantor”). The Notes and the Guarantees are collectively referred to herein as the “Securities.” The Securities will be issued pursuant to an indenture (the “Base Indenture”) to be dated as of September 12, 2013 (the “Closing Date”), among the Company, the Guarantor and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”). Certain terms of the Securities will be established pursuant to a supplemental indenture for each series of Notes dated as of the Closing Date (collectively, the “Supplemental Indenture”) to the Base Indenture (together with the Base Indenture, the “Indenture”).

The Company understands that the Underwriters propose to make a public offering of the Securities as soon as the Representative deems advisable after this agreement (the “Agreement”) has been executed and delivered.

The Company hereby confirms its engagement of Raymond James & Associates, Inc. (“Raymond James”) as, and Raymond James hereby confirms its agreement with the Company to render services as, a “qualified independent underwriter”, within the meaning of Rule 5121 of the Financial Industry Regulatory Authority, Inc. (“FINRA”) with respect to the offering and sale of the Securities. Raymond James, solely in its capacity as the qualified independent underwriter and not otherwise, is referred to herein as the “QIU.” The purchase price per Note at which the Notes will be sold to the public shall not be higher than the maximum price recommended by the QIU.

The Company has filed with the Securities and Exchange Commission (the “Commission”) an automatic shelf registration statement on Form S-3 (No. 333-183729), including the related preliminary prospectus or prospectuses, which registration statement became effective upon filing under Rule 462(e) of the rules and regulations of the Commission (the “1933 Act Regulations”) under the Securities Act of 1933, as amended (the “1933 Act”). Such registration statement covers the registration of the Securities under the 1933 Act. Promptly after execution and delivery of this Agreement, the Company will prepare and file a prospectus in accordance with the provisions of Rule 430B (“Rule 430B”) of the 1933 Act Regulations and paragraph (b) of Rule 424 (“Rule 424(b)”) of the 1933 Act Regulations. Any information included in such prospectus that was omitted from such registration statement at the time it became effective but that is deemed to be part of and included in such registration statement pursuant to Rule 430B is referred to as “Rule 430B Information.” Each prospectus used in connection with the offering of the Securities that omitted Rule 430B Information is herein called a “preliminary prospectus.” Such registration statement, at any given time, including the amendments thereto to such time, the exhibits and any schedules thereto at such time, the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act at such time and the documents otherwise deemed to be a part thereof or included therein by 1933 Act Regulations, is herein called the “Registration Statement.” The Registration Statement at the time it originally became effective is herein called the “Original Registration Statement.” The final prospectus in the form first furnished to the Underwriters for use in connection with the offering of the Securities, including the documents incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act at the time of the execution of this Agreement and any preliminary prospectuses that form a part thereof, is herein called the “Prospectus.” For purposes of this Agreement, all references to the Registration Statement, any preliminary prospectus, the Prospectus or any amendment or supplement to any of the foregoing shall be deemed to include the copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system (“EDGAR”).

All references in this Agreement to financial statements and schedules and other information that is “described,” “contained,” “included” or “stated” in the Registration Statement, any preliminary prospectus or the Prospectus (or other references of like import) shall be deemed to mean and include all such financial statements and schedules and other information that is incorporated by reference in or otherwise deemed by 1933 Act Regulations to be a part of or included in the Registration Statement, any preliminary prospectus or the Prospectus, as the case may be; and all references in this Agreement to amendments or supplements to the Registration Statement, any preliminary prospectus or the Prospectus shall be deemed to mean and include the filing of any document under the Securities Exchange Act of 1934, as amended (the “1934 Act”) that is incorporated by reference in or otherwise deemed by 1933 Act Regulations to be a part of or included in the Registration Statement, such preliminary prospectus or the Prospectus, as the case may be.

SECTION 1. Representations and Warranties.

(a) Representations and Warranties by the Company. The Company represents and warrants to each Underwriter as of the date hereof, the Applicable Time referred to in Section 1(a)(ii) hereof and as of the Closing Time referred to in Section 2(c) hereof, and agree with each Underwriter, as follows:

(i) Status as a Well-Known Seasoned Issuer. (A) At the time of filing the Original Registration Statement, (B) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the 1933 Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of prospectus), (C) at the time the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) of the 1933 Act Regulations) made any offer relating to the Securities in reliance on the exemption of Rule 163 of the 1933 Act Regulations and (D) at the date hereof, the Company was and is a “well-known seasoned issuer” as defined in Rule

405(1)(i)(A) of the 1933 Act Regulations (“Rule 405”), including not having been and not being an “ineligible issuer” as defined in Rule 405. The Registration Statement is an “automatic shelf registration statement,” as defined in Rule 405, and the Securities, since their registration on the Registration Statement, have been and remain eligible for registration by the Company on a Rule 405 “automatic shelf registration statement.” The Company has not received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations objecting to the use of the automatic shelf registration statement form.

At the time of filing the Original Registration Statement, at the earliest time thereafter that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the 1933 Act Regulations) of the Securities and at the date hereof, the Company was not and is not an “ineligible issuer,” as defined in Rule 405.

(ii) Registration Statement, Prospectus and Disclosure at Time of Sale. The Original Registration Statement became effective upon filing under Rule 462(e) of the 1933 Act Regulations (“Rule 462(e)”) on September 5, 2012, and any post-effective amendment thereto also became effective upon filing under Rule 462(e). No stop order suspending the effectiveness of the Registration Statement has been issued under the 1933 Act and no proceedings for that purpose or pursuant to Section 8A of the 1933 Act have been instituted or are pending or, to the knowledge of the Company, are contemplated by the Commission, and any request on the part of the Commission for additional information has been complied with.

Any offer that is a written communication relating to the Securities made prior to the filing of the Original Registration Statement by the Company or any person acting on its behalf (within the meaning, for this paragraph only, of Rule 163(c) of the 1933 Act Regulations) has been filed with the Commission in accordance with the exemption provided by Rule 163 of the 1933 Act Regulations (“Rule 163”) and otherwise complied with the requirements of Rule 163, including without limitation the legending requirement, to qualify such offer for the exemption from Section 5(c) of the 1933 Act provided by Rule 163.

At the respective times the Original Registration Statement and each amendment thereto became effective, at each deemed effective date with respect to the Underwriters pursuant to Rule 430B(f)(2) of the 1933 Act Regulations and at the Closing Time, the Registration Statement complied and will comply in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations, and did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading.

Neither the Prospectus nor any amendments or supplements thereto, at the time the Prospectus or any such amendment or supplement was issued and at the Closing Time, included or will include an untrue statement of a material fact or omitted or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

Each preliminary prospectus (including the prospectus or prospectuses filed as part of the Original Registration Statement or any amendment thereto) complied when so filed in all material respects with the 1933 Act Regulations and each preliminary prospectus and the Prospectus delivered to the Underwriters for use in connection with this offering was identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

As of the Applicable Time, neither (x) the Issuer General Use Free Writing Prospectus (as defined below) issued at or prior to the Applicable Time (as defined below) and the Statutory Prospectus (as defined below) as of the Applicable Time, all considered together (collectively, the “General Disclosure Package”), nor (y) any individual Issuer Limited Use Free Writing Prospectus, when considered together with the General Disclosure Package, included any untrue statement of a material fact or omitted to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

As used in this subsection and elsewhere in this Agreement:

“Applicable Time” means 4:50 pm (Eastern Daylight Time) on September 9, 2013 or such other time as agreed by the Company and Wells Fargo Securities.

“Issuer Free Writing Prospectus” means any “issuer free writing prospectus,” as defined in Rule 433 of the 1933 Act Regulations (“Rule 433”), relating to the Securities that (i) is required to be filed with the Commission by the Company, (ii) is a “road show that is a written communication” within the meaning of Rule 433(d)(8)(i), whether or not required to be filed with the Commission or (iii) is exempt from filing pursuant to Rule 433(d)(5)(i) because it contains a description of the Securities or of the offering that does not reflect the final terms, in each case in the form filed or required to be filed with the Commission or, if not required to be filed, in the form retained in the Company’s records pursuant to Rule 433(g).

“Issuer General Use Free Writing Prospectus” means any Issuer Free Writing Prospectus, including the Final Term Sheet (as defined herein) that is intended for general distribution to prospective investors, as evidenced by its being specified in Schedule C hereto.

“Issuer Limited Use Free Writing Prospectus” means any Issuer Free Writing Prospectus that is not an Issuer General Use Free Writing Prospectus.

“Statutory Prospectus” as of any time means the prospectus relating to the Securities that is included in the Registration Statement immediately prior to that time, including any document incorporated by reference therein and any preliminary or other prospectus deemed to be a part thereof.

Each Issuer Free Writing Prospectus, as of its issue date and at all subsequent times through the completion of the public offer and sale of the Securities or until any earlier date that the issuer notified or notifies the Representative as described in Section 3(f), did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement or the Prospectus, including any document incorporated by reference therein and any preliminary or other prospectus deemed to be a part thereof that has not been superseded or modified.

The representations and warranties in this subsection shall not apply to statements in or omissions from the Registration Statement, the Prospectus or any Issuer Free Writing Prospectus made in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representative expressly for use therein.

(iii) Incorporated Documents. The documents incorporated or deemed to be incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus, at the time they were or hereafter are filed with the Commission, complied and will comply in all material respects with the requirements of the 1934 Act and the rules and

regulations of the Commission thereunder (the “1934 Act Regulations”), and, when read together with the other information in the Prospectus, (a) at the time the Original Registration Statement became effective, (b) at the earlier of the time the Prospectus was first used and the date and time of the first contract of sale of Securities in this offering and (c) at the Closing Time, did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading.

(iv) Independent Accountants. The accountants who certified the financial statements and supporting schedules included in the Registration Statement, the General Disclosure Package and the Prospectus are independent public accountants with respect to the Company as required by the 1933 Act, the 1933 Act Regulations, the 1934 Act Regulations and the Public Accounting Oversight Board.

(v) Financial Statements. The financial statements included in the Registration Statement, the General Disclosure Package and the Prospectus, together with the related schedules and notes, present fairly in all material respects, on the basis set forth in the Prospectus, the financial position of the Company and its consolidated subsidiaries at the dates indicated and the statement of income, stockholders’ equity and cash flows of Company and its consolidated subsidiaries for the periods specified; said financial statements have been prepared in conformity with generally accepted accounting principles in the United States (“GAAP”) applied on a consistent basis throughout the periods involved. The supporting schedules, if any, included in the Registration Statement present fairly in all material respects in accordance with GAAP the information required to be stated therein. The pro forma financial statements and the related notes thereto included in the Registration Statement, the General Disclosure Package and the Prospectus present fairly in all material respects the information shown therein, have been prepared in accordance with the Commission’s rules and guidelines with respect to pro forma financial statements and have been properly compiled on the bases described therein, and the assumptions used in the preparation thereof are reasonable and the adjustments used therein are appropriate to give effect to the transactions and circumstances referred to therein. The summary financial information included in the General Disclosure Package and the Prospectus present fairly in all material respects the information shown therein and have been compiled on a basis consistent with that of the audited financial statements included in the Registration Statement. The Company’s ratio of earnings to fixed charges set forth in each of the General Disclosure Package and the Prospectus and Exhibit 12 to the Registration Statement have been calculated in compliance in all material respects with the requirements of Item 503(d) of Regulation S-K under the 1933 Act Regulations. The interactive data in eXtensible Business Reporting Language incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus fairly presents the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto.

All disclosures contained in the Registration Statement, the General Disclosure Package or the Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply in all material respects with Regulation G of the 1934 Act and Item 10 of Regulation S-K under the 1933 Act, to the extent applicable.

(vi) No Material Adverse Change in Business. Since the respective dates as of which information is given in the Registration Statement, the General Disclosure Package and the Prospectus, except as otherwise stated therein, (A) there has been no material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company, the Guarantor and their respective subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business (a “Material Adverse Effect”), (B) there

have been no transactions entered into by Company, the Guarantor, or any of their respective subsidiaries, other than those in the ordinary course of business, which are material with respect to the Company, the Guarantor and their respective subsidiaries considered as one enterprise, and (C) except as described in the Prospectus, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock.

(vii) Good Standing of the Company. The Company has been duly organized and is validly existing as a corporation in good standing under the laws of the State of Delaware and has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Prospectus and the General Disclosure Package and to enter into and perform its obligations under this Agreement; and the Company is duly qualified as a foreign corporation to transact business and is in good standing in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect.

(viii) Good Standing of Subsidiaries. The Guarantor has been duly organized and is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the General Disclosure Package and the Prospectus and to enter into and perform its obligations under this Agreement, the Indenture and the Securities, and is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect; except as otherwise disclosed in the Registration Statement, all of the issued and outstanding capital stock of the Guarantor has been duly authorized and validly issued, is fully paid and non-assessable and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity; none of the outstanding shares of capital stock of the Guarantor was issued in violation of the preemptive or similar rights of any securityholder of the Guarantor. As of the date of this Agreement, the only subsidiaries of the Company are the Guarantor, Whiting Programs, Inc., Sustainable Water Resources, LLC and Shaw Resources Limited, LLC. The subsidiaries of the Company, other than the Guarantor, do not constitute a “significant subsidiary” as defined in Rule 1-02 of Regulation S-X.

(ix) Capitalization. The authorized, issued and outstanding capital stock of the Company is as included or incorporated by reference in the General Disclosure Package and the Prospectus (except for subsequent issuances, if any, pursuant to reservations, agreements or employee benefit plans referred to in the Prospectus). The shares of issued and outstanding capital stock of the Company have been duly authorized and validly issued and are fully paid and non-assessable; none of the outstanding shares of capital stock of the Company was issued in violation of the preemptive or other similar rights of any securityholder of the Company.

(x) Authorization and Enforceability of Agreements. This Agreement has been duly authorized, executed and delivered by the Company and the Guarantor.

(xi) The Securities. The Notes to be purchased by the Underwriters from the Company will be in the form contemplated by the Indenture, have been duly authorized by the Company for issuance and sale pursuant to this Agreement and the Indenture and, at the Closing Date, will have been duly executed by the Company and, when issued and authenticated in the manner provided for in the Indenture and delivered against payment of the purchase price

therefor, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles, and will be entitled to the benefits of the Indenture. The Guarantees of the Notes will be in the respective forms contemplated by the Indenture, have been duly authorized by the Guarantor for issuance and sale pursuant to this Agreement and the Indenture and, at the Closing Date, will have been duly executed by the Guarantor and, when the Notes have been issued and authenticated in the manner provided for in the Indenture and delivered against payment of the purchase price therefor, will constitute valid and binding obligations of the Guarantor, enforceable in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles, and will be entitled to the benefits of the Indenture.

(xii) The Indenture. The Indenture has been duly qualified under the Trust Indenture Act. The Indenture has been duly authorized by the Company and the Guarantor and, at the Closing Date, will have been duly executed and delivered by the Company and the Guarantor and will constitute a valid and binding agreement of the Company and the Guarantor, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles.

(xiii) Description of Documents. The Securities and the Indenture will conform in all material respects to the descriptions thereof in the General Disclosure Package and the Prospectus under the captions “Description of the Notes” and “Description of the Debt Securities.”

(xiv) Regulations T, U and X. None of the transactions contemplated by this Agreement (including, without limitation, the use of the proceeds from the sale of the Securities) will violate or result in a violation of Section 7 of the 1934 Act or the 1934 Act Regulations, including, without limitation, Regulations T, U, and X of the Board of Governors of the Federal Reserve System.

(xv) Absence of Defaults and Conflicts. Neither the Company, the Guarantor, nor any of their respective subsidiaries is (A) in violation of its respective charter or by-laws or (B) in default in the performance or observance of any obligation, agreement, covenant or condition contained in any contract, indenture, mortgage, deed of trust, loan or credit agreement, note, lease or other agreement or instrument to which Company, the Guarantor, or any of their respective subsidiaries is a party or by which it or any of them may be bound, or to which any of the property or assets of Company, the Guarantor, or any of their respective subsidiaries is subject (collectively, “Agreements and Instruments”), except for such violations or defaults that would not result in a Material Adverse Effect; and the execution, delivery and performance of this Agreement, the Indenture and the Securities and the consummation of the transactions contemplated herein and in the Registration Statement (including the offering, issuance and sale of the Securities pursuant to this Agreement and the use of the proceeds to the Company from the sale of the Securities as described in the General Disclosure Package and the Prospectus under the caption “Use of Proceeds”) and compliance by the Company with its obligations hereunder and under the Indenture and the Securities have been duly authorized by all necessary corporate action and do not and will not, whether with or without the giving of notice or passage of time or both, conflict with or constitute a breach of, or default or Repayment Event (as defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any

property or assets of Company, the Guarantor, or any of their respective subsidiaries pursuant to, the Agreements and Instruments (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not result in a Material Adverse Effect), nor will such action result in any violation of (A) the provisions of the charter or by-laws of Company, the Guarantor, or any of their respective subsidiaries or (B) any applicable law, statute, rule, regulation, judgment, order, writ or decree of any government, government instrumentality or court, domestic or foreign, having jurisdiction over Company, the Guarantor, or any of their respective subsidiaries or any of their assets, properties or operations (except for such violations that would not result in a Material Adverse Effect). As used herein, a “Repayment Event” means any event or condition which gives the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by Company, the Guarantor, or any of their respective subsidiaries.

(xvi) Absence of Labor Dispute. No labor dispute with the employees of the Company, the Guarantor or any of their respective subsidiaries exists or, to the knowledge of the Company or the Guarantor, is imminent, and the Company and the Guarantor are not aware of any existing or imminent labor disturbance by the employees of any of their or any subsidiary’s principal suppliers, manufacturers, customers or contractors, which, in either case, would reasonably be expected to result in a Material Adverse Effect.

(xvii) Absence of Proceedings. There is no action, suit, proceeding, inquiry or investigation before or brought by any court or governmental agency or body, domestic or foreign, now pending, or, to the knowledge of the Company or the Guarantor, threatened, against or affecting the Company or any subsidiary of the Company, which is required to be disclosed in the Registration Statement (other than as disclosed therein), or which might reasonably be expected to result in a Material Adverse Effect, or which might reasonably be expected to materially and adversely affect the properties or assets thereof or the consummation of the transactions contemplated in this Agreement or the performance by the Company or the Guarantor of their respective obligations hereunder. The aggregate of all pending legal or governmental proceedings to which the Company, the Guarantor or any subsidiary of the Company is a party or of which any of their respective property or assets is the subject which are not described in the Registration Statement, including ordinary routine litigation incidental to the business, could not reasonably be expected to result in a Material Adverse Effect.

(xviii) Accuracy of Exhibits. There are no contracts or documents which are required to be described in the Registration Statement, the General Disclosure Package, the Prospectus or the documents incorporated by reference therein or to be filed as exhibits thereto which have not been so described and filed as required.

(xix) Possession of Intellectual Property. The Company, the Guarantor and their respective subsidiaries own or possess, or can acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks, trade names or other intellectual property (collectively, “Intellectual Property”) necessary to carry on the business now operated by them, and neither the Company, the Guarantor, nor any of their respective subsidiaries has received any written notice or is otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of any facts or circumstances which would render any Intellectual Property invalid or inadequate to protect the interest of Company, the Guarantor, or any of their respective subsidiaries therein, and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, singly or in the aggregate, would result in a Material Adverse Effect.

(xx) Absence of Further Requirements. No filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any court or governmental authority or agency is necessary or required for the Company’s and the Guarantor’s execution, delivery and performance of this Agreement, the Indenture and the Securities, the issuance and delivery of the Securities or the consummation of the transactions contemplated hereby or by the General Disclosure Package and the Prospectus with respect to the Securities, except as such as have been already obtained or made and as may be required under the 1933 Act or the 1933 Act Regulations or state securities laws.

(xxi) Absence of Manipulation. Neither the Company nor any affiliate of the Company has taken, nor will the Company or any affiliate take, directly or indirectly, any action which is designed to or which has constituted or which would be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities or result in a violation of Regulation M under the 1934 Act.

(xxii) Possession of Licenses and Permits. The Company and its subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, “Governmental Licenses”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the business now operated by them, except where the failure so to possess would not, singly or in the aggregate, result in a Material Adverse Effect; the Company and its subsidiaries are in compliance with the terms and conditions of all such Governmental Licenses, except where the failure so to comply would not, singly or in the aggregate, result in a Material Adverse Effect; all of the Governmental Licenses are valid and in full force and effect, except when the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect would not, singly or in the aggregate, result in a Material Adverse Effect; and neither the Company, the Guarantor, nor any of their respective subsidiaries has received any written notice of proceedings relating to the revocation or modification of any such Governmental Licenses which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would result in a Material Adverse Effect.

(xxiii) Title to Property. The Company and its subsidiaries have good and marketable title to all real property owned by the Company and its subsidiaries, including, without limitation, all oil and gas producing properties, and good title to all other properties owned by them, including, without limitation, all assets and facilities used by the Company and its subsidiaries in the production and marketing of oil and gas, in each case, free and clear of all mortgages, pledges, liens, security interests, claims, restrictions or encumbrances of any kind except such as (a) are described in the Prospectus or (b) do not, singly or in the aggregate, materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by Company, the Guarantor, or any of their respective subsidiaries; and all of the leases and subleases material to the business of the Company and its subsidiaries, considered as one enterprise, and under which Company, the Guarantor, or any of their respective subsidiaries holds properties described in the General Disclosure Package and the Prospectus, including, without limitation, all oil and gas producing properties of the Company and its subsidiaries and all assets and facilities used by the Company and its subsidiaries in the production and marketing of oil and gas, are in full force and effect, except where such would not have a Material Adverse Effect, and neither the Company, the Guarantor, nor any of their respective subsidiaries has any written notice of any material claim of any sort that has been asserted by anyone adverse to the rights of Company, the Guarantor, or any of their respective subsidiaries under any of the leases or

subleases mentioned above, or affecting or questioning the rights of the Company or such subsidiary to the continued possession of the leased or subleased premises under any such lease or sublease, except where such would not have a Material Adverse Effect.

(xxiv) Environmental Laws. Except as described in the Registration Statement and except as would not, singly or in the aggregate, result in a Material Adverse Effect, (A) neither the Company, the Guarantor, nor any of their respective subsidiaries is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products, asbestos-containing materials or mold (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, “Environmental Laws”), (B) the Company and its subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements, (C) there are no pending or, to the knowledge of the Company, threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigation or proceedings relating to any Environmental Law against Company, the Guarantor, or any of their respective subsidiaries and (D) there are no events or circumstances that would reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting Company, the Guarantor, or any of their respective subsidiaries relating to Hazardous Materials or any Environmental Laws.

(xxv) Registration Rights. There are no persons with registration rights or other similar rights to have any securities registered pursuant to the Registration Statement or otherwise registered by the Company under the 1933 Act.

(xxvi) Independent Petroleum Engineers. Cawley, Gillespie & Associates, Inc., whose report as of December 31, 2012 is referenced in the Prospectus, was, as of the date of such report, and is, as of the date hereof, an independent petroleum engineer with respect to the Company and its subsidiaries.

(xxvii) Accuracy of Reserve Information. The information underlying the estimates of reserves of the Company and its subsidiaries, which was supplied by the Company to Cawley, Gillespie & Associates, Inc. for purposes of auditing the reserve reports and estimates of the Company and preparing the letter (the “Reserve Report Letter”) of Cawley, Gillespie & Associates, Inc., including, without limitation, production, costs of operation and development, current prices for production, agreements relating to current and future operations and sales of production, was true and correct in all material respects on the dates such estimates were made and such information was supplied and was prepared in accordance with customary industry practices; other than normal production of the reserves and intervening spot market product price fluctuations described in the General Disclosure Package and the Prospectus, neither the Company nor its subsidiaries is aware of any facts or circumstances that would result in an adverse change in the reserves, or the present value of future net cash flows therefrom, as described in the Prospectus and as reflected in the Reserve Report Letter, that would reasonably be expected to result in a Material Adverse Effect; estimates of such reserves and present values as described in the General Disclosure Package and the Prospectus and reflected in the Reserve Report Letter comply in all material respects with the applicable requirements of Regulation S-X and Regulation S-K under the 1933 Act.

(xxviii) Oil and Gas Agreements. The participation agreements, joint development agreements, joint operating agreements, farm-out agreements and other agreements described in the Prospectus relating to the Company or its subsidiaries’ rights with respect to the ownership, lease or operation of oil and gas properties, the acquisition of interests in oil and gas properties or the exploration for, development of or production of oil and gas reserves thereon, constitute valid and binding agreements of the Company and its subsidiaries that are parties thereto and, to the best knowledge of the Company, of the other parties thereto, enforceable in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors’ rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law).

(xxix) Insurance. The Company and each of its subsidiaries maintain insurance covering their properties, operations, personnel and businesses that, in the Company’s reasonable judgment, insures against such losses and risks as are adequate in accordance with customary industry practices to protect the Company and its subsidiaries and their businesses.

(xxx) Accounting Controls and Disclosure Controls. The Company and each of its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurances that (1) transactions are executed in accordance with management’s general or specific authorization; (2) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain accountability for assets; (3) access to assets is permitted only in accordance with management’s general or specific authorization; (4) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences; and (5) interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus is prepared in accordance with the Commission’s rules and guidelines applicable thereto. Since the end of the Company’s most recent audited fiscal year, there has been (I) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (II) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

The Company maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the 1934 Act is recorded, processed, summarized and reported, within the time periods specified in the Commission’s rules and forms, and is accumulated and communicated to the Company’s management, including its principal executive officer or officers and principal financial officer or officers, as appropriate, to allow timely decisions regarding disclosure.

(xxxi) Pending Proceedings and Examinations. The Registration Statement is not the subject of a pending proceeding or examination under Section 8(d) or 8(e) of the 1933 Act, and the Company is not the subject of a pending proceeding under Section 8A of the 1933 Act in connection with the offering of the Securities.

(xxxii) No Unlawful Contributions or Other Payments. Neither the Company, the Guarantor, nor any of their respective subsidiaries nor, to the knowledge of the Company and the

Guarantor, any director, officer, agent, employee or affiliate of Company, the Guarantor, or any of their respective subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder (the “FCPA”), including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA, and the Company, its subsidiaries and, to the knowledge of the Company, its affiliates have conducted their businesses in compliance with the FCPA.

(xxxiii) No Conflict with Money Laundering Laws. Except as would not reasonably be expected to result in a Material Adverse Effect, the operations of the Company, the Guarantor and their respective subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving Company, the Guarantor, or any of their respective subsidiaries with respect to the Money Laundering Laws is pending or, to the best knowledge of the Company and the Guarantor, threatened.

(xxxiv) Sarbanes-Oxley Compliance. There is and has been no failure on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply in all material respects with any provision of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the “Sarbanes-Oxley Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications.

(xxxv) No Conflict with OFAC Laws. Neither the Company, the Guarantor, nor any of their respective subsidiaries nor, to the knowledge of the Company and the Guarantor, any director, officer, agent, employee or affiliate of Company, the Guarantor, or any of their respective subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”).

(xxxvi) Company Not an “Investment Company”. Neither the Company nor the Guarantor is, and after receipt of payment for the Securities and the application of the proceeds thereof as contemplated under the caption “Use of Proceeds” in the General Disclosure Package and the Prospectus will be, an “investment company” within the meaning of the Investment Company Act of 1940, as amended.

(xxxvii) No Restrictions on Dividends. The Guarantor is not currently prohibited, directly or indirectly, under any agreement or other instrument to which it is a party or is subject from paying any dividends to the Company, from making any other distribution on the Guarantor’s shares of capital stock or other ownership interests, from repaying to the Company any loans or advances to the Guarantor from the Company or from transferring any of the Guarantor’s property or assets to the Company, except as described in or contemplated by the General Disclosure Package and the Prospectus. The Securities constitute “senior indebtedness” as such term is defined in any indenture or agreement governing any outstanding subordinated indebtedness of the Company.

(xxxviii) Ratings. Except as otherwise disclosed in the General Disclosure Package, no “nationally recognized statistical rating organization” as such term is defined under Section 3(a)(62) under the 1934 Act has indicated to the Company that it is considering (a) the downgrading, suspension, or withdrawal of, or any review for a possible change that does not indicate the direction of the possible change in, any rating so assigned or (b) any negative change in the outlook for any rating of the Company or any securities of the Company.

(b) Officer’s Certificates. Any certificate signed by any officer of Company, the Guarantor, or any of their respective subsidiaries delivered to the Representative or to counsel for the Underwriters shall be deemed a representation and warranty by the Company to each Underwriter as to the matters covered thereby.

SECTION 2. Sale and Delivery to Underwriters; Closing.

(a) Securities. On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to sell to each Underwriter, and each Underwriter, severally and not jointly, agrees to purchase from the Company, at a purchase price per 2019 Note equal to 99.000% of the principal amount thereof and per 2021 Note equal to 99.000% of the principal amount thereof and on the terms set forth in Schedule B, the respective aggregate principal amount of Notes set forth in Schedule A opposite the name of such Underwriter, plus any additional aggregate principal amount of Notes which such Underwriter may become obligated to purchase pursuant to the provisions of Section 10 hereof.

(b) Payment. Payment of the purchase price for, and delivery of one or more global certificates for, the Notes shall be made via facsimile and email and at the office of Whiting Petroleum Corporation, 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, or at such other place as shall be agreed upon by the Representative and the Company, at 9:00 A.M. (Eastern Daylight Time) on the third (fourth, if the pricing occurs after 4:30 P.M. (Eastern Daylight Time) on any given day) business day after the date hereof (unless postponed in accordance with the provisions of Section 10), or such other time not later than ten business days after such date as shall be agreed upon by the Representative and the Company (such time and date of payment and delivery being herein called “Closing Time”).

Payment shall be made to the Company by wire transfer of immediately available funds to a bank account designated by the Company, against delivery of the Notes to Wells Fargo Securities for the respective accounts of the Underwriters through the facilities of the Depositary Trust Company (“DTC”). It is understood that each Underwriter has authorized Wells Fargo Securities, for its account, to accept delivery of, receipt for, and make payment of the purchase price for, the aggregate principal amount of Notes, which it has agreed to purchase. Wells Fargo Securities, individually and not as representative of the Underwriters, may (but shall not be obligated to) make payment of the purchase price for the aggregate principal amount of the Notes, if any, to be purchased by any Underwriter whose funds have not been received by the Closing Time, but such payment shall not relieve such Underwriter from its obligations hereunder.

(c) Denominations; Registration. Certificates for the Notes shall be in global form and registered in the name of Cede & Co., as nominee for DTC. The Company will deliver the Notes to Wells Fargo Securities for the accounts of the Underwriters through the facilities of the DTC, against payment of the purchase price in federal (same day) funds by official bank check or checks or wire transfer to an account for the Company at a bank reasonably acceptable to Wells Fargo Securities drawn to the order of the Company prior to the Closing Time.

SECTION 3. Covenants of the Company and the Guarantor. The Company and the Guarantor, jointly and severally, covenant with each Underwriter as follows:

(a) Compliance with Securities Regulations and Commission Requests; Payment of Filing Fees. The Company, subject to Section 3(b), will comply with the requirements of Rule 430B and will notify the Representative immediately, and confirm the notice in writing, (i) when any post-effective amendment to the Registration Statement or new registration statement relating to the Securities shall become effective, or any supplement to the Prospectus or any amended Prospectus shall have been filed, (ii) of the receipt of any comments from the Commission with respect to the Registration Statement, (iii) of any request by the Commission for any amendment to the Registration Statement or the filing of a new registration statement or any amendment or supplement to the Prospectus or any document incorporated by reference therein or otherwise deemed to be a part thereof or for additional information, (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or such new registration statement or of any order preventing or suspending the use of any preliminary prospectus, or of the suspension of the qualification of the Securities for offering or sale in any jurisdiction, or of the initiation or threatening of any proceedings for any of such purposes or of any examination pursuant to Section 8(e) of the 1933 Act concerning the Registration Statement, (v) if the Company becomes the subject of a proceeding under Section 8A of the 1933 Act in connection with the offering of the Securities and (vi) of the receipt by the Company of any notice of objection of the Commission to the use of the Registration Statement pursuant to Rule 401(g)(2) under the 1933 Act. The Company will effect the filings required under Rule 424(b), in the manner and within the time period required by Rule 424(b) (without reliance on Rule 424(b)(8)), and will take such steps as it deems necessary to ascertain promptly whether the form of prospectus transmitted for filing under Rule 424(b) was received for filing by the Commission and, in the event that it was not, it will promptly file such prospectus. The Company will make every reasonable effort to prevent the issuance of any stop order and, if any stop order is issued, to obtain the lifting thereof at the earliest possible moment. The Company shall pay the required Commission filing fees relating to the Securities within the time required by Rule 456(b)(1)(i) of the 1933 Act Regulations without regard to the proviso therein and otherwise in accordance with Rules 456(b) and 457(r) of the 1933 Act Regulations (including, if applicable, by updating the “Calculation of Registration Fee” table in accordance with Rule 456(b)(1)(ii) either in a post-effective amendment to the Registration Statement or on the cover page of a prospectus filed pursuant to Rule 424(b)).

(b) Filing of Amendments and Exchange Act Documents. The Company will give the Representative notice of its intention to file or prepare any amendment to the Registration Statement or a new registration statement relating to the Securities or any amendment, supplement or revision to either any preliminary prospectus (including any prospectus included in the Original Registration Statement or amendment thereto at the time it became effective) or to the Prospectus, whether pursuant to the 1933 Act, the 1934 Act or otherwise, and the Company will furnish the Representative with copies of any such documents a reasonable amount of time prior to such proposed filing or use, as the case may be, and will not file or use any such document to which the Representative or counsel for the Underwriters shall reasonably object. The Company has given the Representative notice of any filings made pursuant to the 1934 Act or 1934 Act Regulations within 48 hours prior to the Applicable Time; the Company will give the Representative notice of its intention to make any such filing from the Applicable Time to the Closing Time and will furnish the Representative(s) with copies of any such documents a reasonable amount of time prior to such proposed filing and will not file or use any such document to which the Representative(s) or counsel for the Underwriters shall reasonably object.

(c) Final Term Sheet. The Company will coordinate with the Underwriters to prepare a final term sheet in the form set forth on Schedule B hereto, and the Company will file such term sheet pursuant to Rule 433(d) under the 1933 Act within the time required by such rule (such term sheet, the “Final Term Sheet”).

(d) Delivery of Registration Statements. The Company has furnished or will deliver to the Representative and counsel for the Underwriters, without charge, copies (one of which shall be manually signed) of the Original Registration Statement and of each amendment thereto (including exhibits filed therewith or incorporated by reference therein or deemed to be a part thereof) and copies (one of which shall be manually signed) of all consents and certificates of experts, and will also deliver to the Representative, without charge, a conformed copy of the Original Registration Statement and of each amendment thereto (without exhibits) for each of the Underwriters. The copies of the Original Registration Statement and each amendment thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(e) Delivery of Prospectuses. The Company has delivered to each Underwriter, without charge, as many copies of each preliminary prospectus as such Underwriter reasonably requested, and the Company hereby consents to the use of such copies for purposes permitted by the 1933 Act. The Company will furnish to each Underwriter, without charge, during the period when the Prospectus is required to be delivered under the 1933 Act, such number of copies of the Prospectus (as amended or supplemented) as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(f) Continued Compliance with Securities Laws. The Company will comply with the 1933 Act and the 1933 Act Regulations and the 1934 Act and the 1934 Act Regulations so as to permit the completion of the distribution of the Securities as contemplated in this Agreement and in the Prospectus. If at any time when a prospectus is required by the 1933 Act to be delivered in connection with sales of the Securities, any event shall occur or condition shall exist as a result of which it is necessary, in the reasonable opinion of counsel for the Underwriters or for the Company, to amend the Registration Statement or amend or supplement the Prospectus in order that the Prospectus will not include any untrue statements of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the light of the circumstances existing at the time it is delivered to a purchaser, or if it shall be necessary, in the reasonable opinion of such counsel, at any such time to amend the Registration Statement or to file a new registration statement or amend or supplement the Prospectus in order to comply with the requirements of the 1933 Act or the 1933 Act Regulations, the Company will promptly prepare and file with the Commission, subject to Section 3(b), such amendment, supplement or new registration statement as may be necessary to correct such statement or omission or to comply with such requirements. The Company will use its best efforts to have such amendment or new registration statement declared effective as soon as practicable (if it is not an automatic shelf registration statement with respect to the Securities) and the Company will furnish to the Underwriters such number of copies of such amendment, supplement or new registration statement as the Underwriters may reasonably request. If at any time following the issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement (or any other registration statement relating to the Securities) or the Statutory Prospectus or any preliminary prospectus or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company will promptly notify the Representative and will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict, untrue statement or omission.

(g) Blue Sky Qualifications. The Company and the Guarantor will use its best efforts, in cooperation with the Underwriters, to qualify the Securities for offering and sale under the applicable securities laws of such states and other jurisdictions (domestic or foreign) as the Representative may designate and to maintain such qualifications in effect for a period of not less than one year from the date hereof; provided, however, that neither the Company nor the Guarantor shall be obligated to file any general consent to service of process or to qualify as a foreign corporation or as a dealer in securities in any jurisdiction in which it is not so qualified or to subject itself to taxation in respect of doing business in any jurisdiction in which it is not otherwise so subject.

(h) Rule 158. The Company will timely file such reports pursuant to 1934 Act, as are necessary in order to make generally available to its securityholders as soon as practicable an earnings statement for the purposes of, and to provide to the Underwriters the benefits contemplated by, the last paragraph of Section 11(a) of the 1933 Act.

(i) Use of Proceeds. The Company will use the net proceeds received by it from the sale of the Securities in the manner specified in the Registration Statement, the General Disclosure Package and the Prospectus under “Use of Proceeds.”

(j) Restriction on Sale of Securities. During a period of 90 days from the date of the Prospectus, the Company will not, without the prior written consent of Wells Fargo Securities, directly or indirectly, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise transfer or dispose of any of the Company’s debt securities or any securities convertible into or exercisable or exchangeable for the Company’s debt securities or file any registration statement under the 1933 Act with respect to any of the foregoing (other than as contemplated by this Agreement), excluding any borrowings under the Guarantor’s credit agreement.

(k) Reporting Requirements. The Company, during the period when the Prospectus is required to be delivered under the 1933 Act, will file all documents required to be filed with the Commission pursuant to the 1934 Act within the time periods required by the 1934 Act and the 1934 Act Regulations.

(l) No Advisory or Fiduciary Relationship. The Company acknowledges and agrees that (i) the purchase and sale of the Securities pursuant to this Agreement, including the determination of the public offering price of the Securities and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other hand, (ii) in connection with the offering contemplated hereby and the process leading to such transaction each Underwriter is and has been acting solely as a principal and is not the agent or fiduciary of the Company or its stockholders, creditors, employees or any other party, (iii) no Underwriter has assumed or will assume an advisory or fiduciary responsibility in favor of the Company with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) and no Underwriter has any obligation to the Company with respect to the offering contemplated hereby (other than any confidentiality obligation that such Underwriter may generally have to the Company) except the obligations expressly set forth in this Agreement, (iv) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company, and (v) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the offering contemplated hereby and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

(m) Issuer Free Writing Prospectuses. The Company represents and agrees that, unless it obtains the prior consent of the Representative, and each Underwriter represents and agrees that, unless it obtains the prior consent of the Company and the Representative, it has not made and will not make any offer relating to the Securities that would constitute an “issuer free writing prospectus,” as defined in Rule 433, or that would otherwise constitute a “free writing prospectus,” as defined in Rule 405, required to be filed with the Commission. Any such free writing prospectus consented to by the Company and the Representative is hereinafter referred to as a “Permitted Free Writing Prospectus.” The Company represents that it has treated or agrees that it will treat each Permitted Free Writing Prospectus as an “issuer free writing prospectus,” as defined in Rule 433, and has complied and will comply with the requirements of Rule 164 and Rule 433 applicable to any Permitted Free Writing Prospectus, including timely filing with the Commission where required, legending and record keeping.

(n) DTC. The Company will use its commercially reasonable efforts to obtain the approval of DTC to permit the Notes to be eligible for “book-entry” transfer and settlement through the facilities of DTC, and agrees to comply with all of its agreements set forth in the representation letters of the Company to DTC relating to the approval of the Notes by DTC for “book-entry” transfer.

SECTION 4. Payment of Expenses.

(a) Expenses. The Company and the Guarantor, jointly and severally, will pay all expenses incident to the performance of its obligations under this Agreement, including (i) the preparation, printing and filing of the Registration Statement (including financial statements and any schedules or exhibits) as originally filed and of each amendment thereto, (ii) the reproduction and delivery to the Underwriters of this Agreement, the Indenture, any Agreement among Underwriters and such other documents as may be required in connection with the offering, purchase, sale, issuance or delivery of the Securities, (iii) the preparation, issuance and delivery of the global certificates for the Securities to the Underwriters, including any transfer taxes and any stamp or other duties payable upon the sale, issuance or delivery of the Securities to be issued and sold by the Company to the Underwriters, (iv) the fees and disbursements of the Company’s and the Guarantor’s counsel, accountants and other advisors, (v) the qualification of the Securities under securities laws in accordance with the provisions of Section 3(g) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection therewith and in connection with the preparation of one Blue Sky Survey, if any, and any supplement thereto for the Securities (provided that counsel fees in connection therewith do not exceed $5,000), (vi) the printing and delivery to the Underwriters of copies of each preliminary prospectus, any Permitted Free Writing Prospectus and of the Prospectus and any amendments or supplements thereto and any costs associated with electronic delivery of any of the foregoing by the Underwriters to investors, (vii) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in connection with the Indenture and the Securities, (viii) any fees payable in connection with the rating of the Securities with the ratings agencies, (ix) the filing fees for FINRA’s review of the offering of the Securities, and the reasonable fees and disbursements of counsel to the Underwriters in connection with compliance with FINRA’s rules and regulations (provided that counsel fees in connection therewith do not exceed $5,000), (ix) all fees and expenses (including reasonable fees and expenses of counsel) of the Company and the Guarantor in connection with approval of the Securities by DTC for “book-entry” transfer, (x) all other fees, costs and expenses referred to in Item 14 of Part II of the Registration Statement, and (xi) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the Securities, including without limitation, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations, travel and lodging expenses of the representatives and officers of the Company and any such consultants, and the cost of aircraft and other transportation chartered in connection with the road show. It is understood, however, that, except as provided in this Section 4, Section 6, Section 7 and Section 9 hereof, the Underwriters will pay all of their own costs and expenses, including the fees and expenses of their counsel.

(b) Termination of Agreement. If this Agreement is terminated by the Representative in accordance with the provisions of Section 5 or Section 9(a)(i) hereof, the Company shall reimburse the Underwriters for all of their out-of-pocket expenses, up to $200,000, including the reasonable fees and disbursements of counsel for the Underwriters.

SECTION 5. Conditions of Underwriters’ Obligations. The obligations of the several Underwriters hereunder are subject to the accuracy of the representations and warranties of the Company and each Guarantor contained in Section 1 hereof on the date hereof and at the Closing Time or in certificates of any officer of Company, the Guarantor, or any of their respective subsidiaries delivered pursuant to the provisions hereof at Closing Time, to the performance by the Company and each Guarantor of its covenants and other obligations hereunder, and to the following further conditions:

(a) Effectiveness of Registration Statement; Filing of Prospectus; Payment of Filing Fee. The Registration Statement has become effective and at Closing Time no stop order suspending the effectiveness of the Registration Statement shall have been issued under the 1933 Act or proceedings therefor initiated or threatened by the Commission, nor has the Company received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act objecting to the use of the automatic shelf registration form by the Company, and any request on the part of the Commission for additional information shall have been complied with to the reasonable satisfaction of counsel to the Underwriters. A prospectus containing the Rule 430B Information shall have been filed with the Commission in the manner and within the time period required by Rule 424(b) without reliance on Rule 424(b)(8) (or a post-effective amendment providing such information shall have been filed and become effective in accordance with the requirements of Rule 430B) and any materials required to be filed by the Company pursuant to Rule 433 of the 1933 Act shall have been filed with the Commission within the applicable time periods prescribed for such filings under such Rule 433. The Company shall have paid the required Commission filing fees relating to the Securities within the time period required by Rule 456(1)(i) of the 1933 Act Regulations without regard to the proviso therein and otherwise in accordance with Rules 456(b) and 457(r) of the 1933 Act Regulations and, if applicable, shall have updated the “Calculation of Registration Fee” table in accordance with Rule 456(b)(1)(ii) either in a post-effective amendment to the Registration Statement or on the cover page of a prospectus filed pursuant to Rule 424(b).

(b) FINRA. Prior to the Closing Time, FINRA shall have advised the Representative in writing that it has not objected to the underwriting and other terms and arrangements related to the offering of the Securities.

(c) Opinion of Counsel for Company. At Closing Time, the Representative shall have received the favorable opinion, dated as of Closing Time, in form and substance reasonably satisfactory to counsel for the Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters, of each of (i) Foley & Lardner LLP, counsel for the Company; and (ii) Bruce R. DeBoer, Vice President, General Counsel and Corporate Secretary of the Company.

(d) Letter from Counsel for Company. At Closing Time, the Representative shall have received a letter, dated as of Closing Time, in form and substance reasonably satisfactory to counsel for the Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters, of Foley & Lardner LLP, counsel for the Company.

(e) Opinion of Counsel for Underwriters. At Closing Time, the Representative shall have received the favorable opinion, dated as of Closing Time, of Vinson & Elkins L.L.P., counsel for the

Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters in a form and substance satisfactory to, and addressed to, the Underwriters, with respect to the issuance and sale of the Notes, the Registration Statement, the Prospectus, the General Disclosure Package and other related matters as the Representative may reasonably require.

(f) Officers’ Certificate. At Closing Time, there shall not have been, since the date hereof or since the respective dates as of which information is given in the Prospectus or the General Disclosure Package (exclusive of any amendment or supplement thereto subsequent to the date of this Agreement), any material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company, the Guarantor and their respective subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, and the Representative shall have received a certificate of the Chief Executive Officer, President or a Vice President of the Company and of the chief financial or chief accounting officer of the Company, dated as of Closing Time, to the effect that (i) there has been no such material adverse change, (ii) the representations and warranties in Section 1(a) hereof are true and correct with the same force and effect as though expressly made at and as of Closing Time, (iii) the Company has complied in all material respects with all agreements and satisfied all conditions on its part to be performed or satisfied at or prior to Closing Time, and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose pursuant to Rule 401(g)(2) or Section 8A under the 1933 Act have been instituted or are pending or, to their knowledge, contemplated by the Commission.

(g) Accountant’s Comfort Letter. At the time of the execution of this Agreement, the Representative shall have received from Deloitte & Touche LLP a letter dated such date, in form and substance satisfactory to the Representative, together with signed or reproduced copies of such letter for each of the other Underwriters containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement and the Prospectus.

(h) Bring-down Comfort Letter. At Closing Time, the Representative shall have received from Deloitte & Touche LLP a letter, dated as of Closing Time, to the effect that they reaffirm the statements made in the letter furnished pursuant to subsection (g) of this Section, except that the specified date referred to shall be a date not more than three business days prior to Closing Time.

(i) Form of Securities and Indenture. The Securities and the Indenture shall be executed by the Company, or the Guarantor, as the case may be, in form and substance reasonably satisfactory to the Representative and the Trustee.

(j) Reserve Engineers’ Letter. At the Closing Time, the Underwriters shall have received from Cawley, Gillespie & Associates, Inc., a letter, in form and substance reasonably satisfactory to the Underwriters, addressed to the Underwriters and dated the date hereof covering the matters described in Exhibit A.

(k) Credit Facility Amendment. At or prior to the Closing Time, the Company shall have executed the Fifth Amendment to the Fifth Amended and Restated Credit Agreement, dated as of October 15, 2010, among the Company, the Guarantor, the lenders party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent, and the various other agents party thereto.

(l) Additional Documents. At Closing Time, counsel for the Underwriters shall have been furnished with such documents and opinions as they may reasonably require for the purpose of enabling them to pass upon the issuance and sale of the Securities as herein contemplated, or in order to evidence the accuracy of any of the representations or warranties, or the fulfillment of any of the conditions, herein

contained; and all proceedings taken by the Company in connection with the issuance and sale of the Securities as herein contemplated shall be reasonably satisfactory in form and substance to the Representative and counsel for the Underwriters.

(m) Termination of Agreement. If any condition specified in this Section shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representative by notice to the Company at any time at or prior to Closing Time and such termination shall be without liability of any party to any other party except as provided in Section 4 and except that Sections 1, 6, 7 and 8 shall survive any such termination and remain in full force and effect.

SECTION 6. Indemnification.

(a) Indemnification of Underwriters. The Company and the Guarantor, jointly and severally, agree to indemnify and hold harmless each Underwriter, its directors, its officers, its affiliates, as such term is defined in Rule 501(b) under the 1933 Act (each, an “Affiliate”) and each person, if any, who controls any Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act as follows:

(i) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, arising out of any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment thereto), including the Rule 430B Information or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading or arising out of any untrue statement or alleged untrue statement of a material fact included in any preliminary prospectus, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading;

(ii) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, to the extent of the aggregate amount paid in settlement of any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or of any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission; provided that (subject to Section 6(d) below) any such settlement is effected with the written consent of the Company; and

(iii) against any and all expense whatsoever, as incurred (including the fees and disbursements of counsel chosen by the Wells Fargo Securities), reasonably incurred in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission, to the extent that any such expense is not paid under (i) or (ii) above;

provided, however, that this indemnity agreement shall not apply to any loss, liability, claim, damage or expense to the extent arising out of any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representative expressly for use in the Registration Statement, including the Rule 430B Information or any preliminary prospectus, the General Disclosure Package, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto).

(b) Indemnification of Company and the Guarantor. Each Underwriter severally agrees to indemnify and hold harmless the Company and the Guarantor, each of their respective directors, each of

their respective officers who signed the Registration Statement, and each person, if any, who controls the Company or any of the Guarantor within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act against any and all loss, liability, claim, damage and expense described in the indemnity contained in Subsection (a)(i) of this Section 6, as incurred, but only with respect to untrue statements or omissions, or alleged untrue statements or omissions, made in the Registration Statement (or any amendment thereto), including the Rule 430B Information, or any preliminary prospectus, any Issuer Free Writing Prospectus or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representative expressly for use in the Registration Statement, the General Disclosure Package, the Prospectus (or any amendment or supplement thereto) or any Issuer Free Writing Prospectus, it being understood and agreed upon that the only such information furnished by any Underwriter consists of the following information in the Prospectus furnished on behalf of each Underwriter: the concession figure appearing in the fourth paragraph under the caption “Underwriting (Conflicts of Interest),” and the information contained in the seventh and eighth paragraphs under the caption “Underwriting (Conflicts of Interest).”

(c) Actions against Parties; Notification. Each indemnified party shall give notice as promptly as reasonably practicable to each indemnifying party of any action commenced against it in respect of which indemnity may be sought hereunder, but failure to so notify an indemnifying party shall not relieve such indemnifying party from any liability hereunder to the extent it is not materially prejudiced as a result thereof and in any event shall not relieve it from any liability which it may have otherwise than on account of this indemnity agreement. In the case of parties indemnified pursuant to Section 6(a) above, counsel to the indemnified parties shall be selected by Wells Fargo Securities, and, in the case of parties indemnified pursuant to Section 6(b) above, counsel to the indemnified parties shall be selected by the Company. An indemnifying party may participate at its own expense in the defense of any such action; provided, however, that counsel to the indemnifying party shall not (except with the consent of the indemnified party) also be counsel to the indemnified party. In no event shall the indemnifying parties be liable for fees and expenses of more than one counsel (in addition to any local counsel) separate from their own counsel for all indemnified parties in connection with any one action or separate but similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances. In addition, the indemnifying party shall be entitled, to the extent that it wishes, jointly with any other similarly notified indemnifying party, to assume the defense of any claim or action brought against an indemnified party with counsel reasonably satisfactory to the indemnified party. After notice from the indemnifying party to the indemnified party of its election to assume the defense of such claim or action, the indemnifying party shall not be liable to the indemnified party under this Section 6 for any legal or other expenses subsequently incurred by the indemnified party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that Wells Fargo Securities shall have the right to employ one counsel (in addition to local counsel) to represent them and those other Underwriters and their respective officers, employees and controlling persons who may be subject to liability arising out of any claim in respect of which indemnity may be sought by the Underwriters against the indemnifying party under this Section 6 if, in the reasonable judgment of Wells Fargo Securities, either (i) there is an actual or potential conflict between the position of the indemnifying party on the one hand and the Underwriters on the other hand or (ii) there may be defenses available to it or them that are different from or additional to those available to the indemnifying party (in any of which events the indemnifying party shall not have the right to direct the defense of such action on behalf of the indemnified parties), in any of which events such reasonable fees and expenses shall be borne by the indemnifying party. No indemnifying party shall, without the prior written consent of the indemnified parties, settle or compromise or consent to the entry of any judgment with respect to any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever in respect of which indemnification or contribution could be sought under this Section 6 or Section 7 hereof (whether or not the indemnified parties are actual or potential parties thereto), unless

such settlement, compromise or consent (i) includes an unconditional release of each indemnified party from all liability arising out of such litigation, investigation, proceeding or claim and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party.

(d) Settlement without Consent if Failure to Reimburse. If at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel, such indemnifying party agrees that it shall be liable for any settlement of the nature contemplated by Section 6(a)(ii) effected without its written consent if (i) such settlement is entered into more than 45 days after receipt by such indemnifying party of the aforesaid request, (ii) such indemnifying party shall have received notice of the terms of such settlement at least 30 days prior to such settlement being entered into and (iii) such indemnifying party shall not have reimbursed such indemnified party in accordance with such request prior to the date of such settlement.

(e) Indemnification of the QIU. Without limitation and in addition to its obligation under the other subsections of this Section 6, the Company agrees to indemnify and hold harmless the QIU, its officers and employees and each person, if any, who controls the QIU within the meaning of the 1933 Act or the 1934 Act from and against any loss, claim, damage, liabilities or expense, as incurred, arising out of or based upon the QIU’s acting as a “qualified independent underwriter” (within the meaning of FINRA Rule 5121) in connection with the offering contemplated by this Agreement, and agrees to reimburse each such indemnified person for any legal or other expense reasonably incurred by them in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action.

SECTION 7. Contribution. If the indemnification provided for in Section 6 hereof is for any reason unavailable to or insufficient to hold harmless an indemnified party in respect of any losses, liabilities, claims, damages or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount of such losses, liabilities, claims, damages and expenses incurred by such indemnified party, as incurred, (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Guarantor on the one hand and the Underwriters on the other hand from the offering of the Securities pursuant to this Agreement or (ii) if the allocation provided by clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company and the Guarantor on the one hand and of the Underwriters on the other hand in connection with the statements or omissions, which resulted in such losses, liabilities, claims, damages or expenses, as well as any other relevant equitable considerations.

The relative benefits received by the Company and the Guarantor on the one hand and the Underwriters on the other hand in connection with the offering of the Securities pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Securities pursuant to this Agreement (before deducting expenses) received by the Company and the Guarantor and the total underwriting discount received by the Underwriters, in each case as set forth on the cover of the Prospectus, bear to the aggregate initial public offering price of the Securities as set forth on the cover of the Prospectus.

The relative fault of the Company and the Guarantor on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company and the Guarantor or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 7 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this Section 7. The aggregate amount of losses, liabilities, claims, damages and expenses incurred by an indemnified party and referred to above in this Section 7 shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue or alleged untrue statement or omission or alleged omission.

Notwithstanding the provisions of this Section 7, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of any such untrue or alleged untrue statement or omission or alleged omission.

No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

For purposes of this Section 7, each person, if any, who controls an Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act and each Underwriter’s officers, Affiliates and selling agents shall have the same rights to contribution as such Underwriter, and each director of the Company or a Guarantor, each officer of the Company or a Guarantor who signed the Registration Statement, and each person, if any, who controls the Company or a Guarantor within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act shall have the same rights to contribution as the Company and the Guarantor. The Underwriters’ respective obligations to contribute pursuant to this Section 7 are several in proportion to the aggregate principal amount of Notes set forth opposite their respective names in Schedule A hereto and not joint.

SECTION 8. Representations, Warranties and Agreements to Survive. All representations, warranties and agreements contained in this Agreement or in certificates of officers of Company, the Guarantor, or any of their respective subsidiaries submitted pursuant hereto, shall remain operative and in full force and effect regardless of (i) any investigation made by or on behalf of any Underwriter or its Affiliates or selling agents, any person controlling any Underwriter, any officer or director of any Underwriter, the QIU or its Affiliates, any person controlling the QIU, or any person controlling the Company and (ii) delivery of and payment for the Securities.

SECTION 9. Termination of Agreement.

(a) Termination; General. The Representative may terminate this Agreement, by notice to the Company, at any time at or prior to Closing Time (i) if there has been, since the time of execution of this Agreement or since the respective dates as of which information is given in the Prospectus (exclusive of any amendment or supplement thereto subsequent to the date of this Agreement) or the General Disclosure Package, any material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company, the Guarantor and their respective subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, or (ii) if there has occurred after the date hereof and prior to the Closing Time any material adverse change in the financial markets in the United States or the international financial markets, any outbreak of hostilities or escalation thereof or other calamity or crisis or any change or development involving a prospective change in national or international political, financial or economic conditions, in each case the

effect of which is such as to make it, in the reasonable judgment of the Representative, impracticable or inadvisable to proceed with the offering, sale or delivery of the Securities or to enforce contracts for the sale of the Securities, or (iii) if trading in any securities of the Company has been suspended or materially limited by the Commission or the New York Stock Exchange, or if trading generally on the American Stock Exchange or the New York Stock Exchange or in the Nasdaq National Market has been suspended or materially limited, or minimum or maximum prices for trading have been fixed, or maximum ranges for prices have been required, by any of said exchanges or by such system or by order of the Commission, FINRA or any other governmental authority, or (iv) if a material disruption has occurred in commercial banking or securities settlement or clearance services in the United States, or (v) if a banking moratorium has been declared by either federal or New York authorities.

(b) Liabilities. If this Agreement is terminated pursuant to this Section, such termination shall be without liability of any party to any other party except as provided in Section 4 hereof, and provided further that Sections 1, 6, 7 and 8 shall survive such termination and remain in full force and effect.

SECTION 10. Default by One or More of the Underwriters. If one or more of the Underwriters shall fail at Closing Time to purchase the Securities which it or they are obligated to purchase under this Agreement (the “Defaulted Securities”), the Representative shall have the right, within 24 hours thereafter, to make arrangements for one or more of the non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Securities in such amounts as may be agreed upon and upon the terms herein set forth; if, however, the Representative shall not have completed such arrangements within such 24-hour period, then:

(a) if the number of Defaulted Securities does not exceed 10% of the number of Securities to be purchased on such date, each of the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all non-defaulting Underwriters, or

(b) if the number of Defaulted Securities exceeds 10% of the number of Securities to be purchased on such date, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

No action taken pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default.

In the event of any such default which does not result in a termination of this Agreement, either the Representative or the Company shall have the right to postpone Closing Time for a period not exceeding seven days in order to effect any required changes in the Registration Statement or Prospectus or in any other documents or arrangements. As used herein, the term “Underwriter” includes any person substituted for an Underwriter under this Section 10.

SECTION 11. Tax Disclosure. Notwithstanding any other provision of this Agreement, immediately upon commencement of discussions with respect to the transactions contemplated hereby, the Company (and each employee, representative or other agent of the Company) may disclose to any and all persons, without limitation of any kind, the tax treatment and tax structure of the transactions contemplated by this Agreement and all materials of any kind (including opinions or other tax analyses) that are provided to the Company relating to such tax treatment and tax structure. For purposes of the foregoing, the term “tax treatment” is the purported or claimed federal income tax treatment of the transactions contemplated hereby, and the term “tax structure” includes any fact that may be relevant to understanding the purported or claimed federal income tax treatment of the transactions contemplated hereby.

SECTION 12. Notices. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be directed to Wells Fargo Securities at 375 Park Avenue, 5th Floor, New York, New York 10152, attention of Legal Department; notices to the Company shall be directed to them at 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, attention of James J. Volker.

SECTION 13. Parties. This Agreement shall inure to the benefit of and be binding upon the Underwriters and the Company and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the Underwriters, the QIU and the Company and their respective successors and the controlling persons and officers and directors referred to in Sections 6 and 7 and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. This Agreement and all conditions and provisions hereof are intended to be for the sole and exclusive benefit of the Underwriters, the QIU, the Company, and the Guarantor and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Securities from any Underwriter shall be deemed to be a successor by reason merely of such purchase.

SECTION 14. GOVERNING LAW. THIS AGREEMENT AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

SECTION 15. TIME. TIME SHALL BE OF THE ESSENCE OF THIS AGREEMENT. EXCEPT AS OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

SECTION 16. Counterparts. This Agreement may be executed in any number of counterparts (which may include counterparts delivered by any standard form of telecommunication), each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Agreement. Facsimile signatures or signatures received as a pdf attachment to electronic mail shall be treated as original signatures for all purposes of this Agreement.

SECTION 17. Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

SECTION 18. USA PATRIOT Act. In accordance with the requirements of the USA PATRIOT Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Underwriters are required to obtain, verify and record information that identifies its clients, including the Company and the Guarantor, which information may include the name and address of its clients, as well as other information that will allow the Underwriters to properly identify its clients.

If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement between the Underwriters and the Company in accordance with its terms.


Very truly yours, WHITING PETROLEUM CORPORATION

By		/s/ James J. Volker
Name:		James J. Volker
Title:		Chairman and Chief Executive Officer


GUARANTOR: WHITING OIL AND GAS CORPORATION

By:		/s/ James J. Volker
Name:		James J. Volker
Title:		Chairman and Chief Executive Officer


CONFIRMED AND ACCEPTED, as of the date first above written: WELLS FARGO SECURITIES, LLC

By:		/s/Rob Johnson
		Authorized Signatory

For itself as Representative of each of the other Underwriters named in Schedule A hereto.

SCHEDULE A


Name of Underwriter	Principal Amount of 2019 Notes		Principal Amount of 2021 Notes
Wells Fargo Securities, LLC	$	275,000,000	$	200,000,000
J.P. Morgan Securities LLC 11,025,000		275,000,000		200,000,000
Merrill Lynch Pierce Fenner & Smith Incorporated		132,000,000		96,000,000
BBVA Securities Inc.		44,000,000		32,000,000
SunTrust Robinson Humphrey, Inc.		44,000,000		32,000,000
U.S. Bancorp Investments, Inc.		44,000,000		32,000,000
Capital One Securities, Inc.		33,000,000		24,000,000
CIBC World Markets Corp.		33,000,000		24,000,000
RBC Capital Markets, LLC		33,000,000		24,000,000
Mitsubishi UFJ Securities (USA), Inc.		33,000,000		24,000,000
KeyBanc Capital Markets Inc.		22,000,000		16,000,000
RB International Markets (USA) LLC		22,000,000		16,000,000
Scotia Capital (USA) Inc.		22,000,000		16,000,000
Santander Investment Securities Inc.		22,000,000		16,000,000
Barclays Capital Inc.		11,000,000		8,000,000
BOSC, Inc.		11,000,000		8,000,000
Comerica Securities, Inc.		11,000,000		8,000,000
Fifth Third Securities, Inc.		11,000,000		8,000,000
Morgan Stanley & Co. LLC		11,000,000		8,000,000
Raymond James & Associates, Inc.		11,000,000		8,000,000

Total	$	1,100,000,000	$	800,000,000

Sch A-1

SCHEDULE B

Filed Pursuant to Rule 433

Registration No. 333-183729

September 9, 2013

Pricing term sheet dated September 9, 2013

to Preliminary Prospectus Supplement dated September 9, 2013

(the “Preliminary Prospectus Supplement”)

Whiting Petroleum Corporation

$1,900,000,000

$1,100,000,000 5.000% Senior Notes due 2019

$800,000,000 5.750% Senior Notes due 2021

The following information supplements the Preliminary Prospectus Supplement for the offering of 2019 Notes and 2021 Notes dated September 9, 2013, filed pursuant to Rule 424(b) under the Securities Act, Registration Statement No. 333-183729.


Issuer:		Whiting Petroleum Corporation, a Delaware corporation (“WLL”)

Guarantor:		Whiting Oil and Gas Corporation, a Delaware corporation

Title of Securities:		5.000% Senior Notes due 2019 (the “2019 Notes”) 5.750% Senior Notes due 2021 (the “2021 Notes”)

Distribution:		SEC Registered

Principal Amount:		2019 Notes: $1,100,000,000 2021 Notes: $800,000,000

Public Offering Price:		2019 Notes: 100.000% 2021 Notes: 100.000% Total: $1,900,000,000

Underwriting Discounts and Commissions:		2019 Notes: 1.000% 2021 Notes: 1.000% Total: $19,000,000

Proceeds, Before Expenses, to Whiting Petroleum Corporation:		2019 Notes: 99.000% 2021 Notes: 99.000% Total: $1,881,000,000

Interest Rate:		2019 Notes: 5.000% 2021 Notes: 5.750%

Interest Payment Dates:		September 15 and March 15, commencing March 15, 2014

Date of Maturity:		2019 Notes: March 15, 2019 2021 Notes: March 15, 2021

Sch B-1


Yield to Maturity:		2019 Notes: 5.000% 2021 Notes: 5.750%

Optional Redemption:		2019 Notes: Make-whole call @ Treasury + 50 bps prior to December 15, 2018, then 100% 2021 Notes: Make-whole call @ Treasury + 50 bps prior to December 15, 2020, then 100%

Change of Control:		2019 Notes: Put @ 101% of principal plus accrued interest 2021 Notes: Put @ 101% of principal plus accrued interest

CUSIP:		2019 Notes: 966387 AG7 2021 Notes: 966387 AH5

ISIN:		2019 Notes: US966387AG72 2021 Notes: US966387AH55

Trade Date:		September 9, 2013

Settlement Date:		September 12, 2013 (T + 3)

Joint Book-Running Managers:		Wells Fargo Securities, LLC J.P. Morgan Securities LLC Merrill Lynch, Pierce, Fenner & Smith Incorporated

Senior Co-Managers: Co-Managers:		BBVA Securities Inc. SunTrust Robinson Humphrey, Inc. U.S. Bancorp Investments, Inc. Capital One Securities, Inc. CIBC World Markets Corp. RBC Capital Markets, LLC Mitsubishi UFJ Securities (USA), Inc. KeyBanc Capital Markets Inc. RB International Markets (USA) LLC Scotia Capital (USA) Inc. Santander Investment Securities Inc. Barclays Capital Inc. BOSC, Inc. Comerica Securities, Inc. Fifth Third Securities, Inc. Morgan Stanley & Co. LLC Raymond James & Associates, Inc.

Sch B-2

Additional Information

All information (including financial information) presented in the Preliminary Prospectus Supplement is deemed to have changed to the extent affected by the changes described herein.

Prospectus Supplement Summary —Ratio of Earnings to Fixed Charges

The table that appears in the Preliminary Prospectus Supplement under “Prospectus Supplement Summary—Ratio of Earnings to Fixed Charges” is amended to include the following information regarding our pro forma ratio of earnings to fixed charges for the six months ended June 30, 2013 and the year ended December 31, 2012 to give effect to this offering and the anticipated application of the estimated net proceeds of this offering as described in “Use of Proceeds.”


	Pro Forma for the Six Months Ended June 30, 2013		Pro Forma for the Year Ended December 31, 2012
Ratio of earnings to fixed charges (1)		6.45x		7.20x

(1) For purposes of calculating the ratios above, earnings consist of income (loss) before income taxes and before income or loss from equity investees, plus fixed charges and amortization of capitalized interest and distributed income of equity investees, less capitalized interest. Fixed charges consist of interest expensed, interest capitalized, amortized premiums, discounts and capitalized expenses related to indebtedness and an estimate of interest within rental expense.

Capitalization

The table that appears in the Preliminary Prospectus Supplement under “Capitalization” is amended to reflect the following information regarding our capitalization as of June 30, 2013 on a pro forma basis to give effect to the sale of the Postle properties and as adjusted to give effect to the increased offering size and the anticipated application of the estimated net proceeds of this offering as described in “Use of Proceeds.”


	Pro Forma for Postle Sale and as Adjusted
Cash and cash equivalents	$	491,767
5.000% Senior Notes due 2019	$	1,100,000
5.750% Senior Notes due 2021	$	800,000
Total long-term debt	$	2,250,000
Total capitalization	$	6,027,378

Sch B-3

This communication is intended for the sole use of the person to whom it is provided by the sender.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy securities nor shall there be any sale of these securities in any jurisdiction in which such solicitation or sale would be unlawful prior to registration or qualification of these securities under the laws of any such jurisdiction.

The information in this term sheet supplements the Preliminary Prospectus Supplement and supersedes the information in the Preliminary Prospectus Supplement to the extent inconsistent with the information in the Preliminary Prospectus Supplement. This term sheet is qualified in its entirety by reference to the Preliminary Prospectus Supplement. Terms used herein but not defined herein shall have the respective meanings as set forth in the Preliminary Prospectus Supplement.

The issuer has filed a registration statement including a prospectus and a prospectus supplement with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus and prospectus supplement in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may obtain these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus and the prospectus supplement if you request them from Wells Fargo Securities, LLC by calling (800) 326-5897, from J.P. Morgan Securities LLC by calling (866) 803-9204 or from BofA Merrill Lynch at 222 Broadway, 11th Floor, New York, NY 10038, Attention: Prospectus Department, or at dg.prospectus_requests@baml.com.

ANY DISCLAIMER OR OTHER NOTICES THAT MAY APPEAR BELOW ARE NOT APPLICABLE TO THIS COMMUNICATION AND SHOULD BE DISREGARDED. SUCH DISCLAIMERS OR OTHER NOTICES WERE AUTOMATICALLY GENERATED AS A RESULT OF THIS COMMUNICATION BEING SENT VIA BLOOMBERG OR ANOTHER EMAIL SYSTEM.

Sch B-4

SCHEDULE C

1. The term sheet containing the terms of the Securities substantially in the form of Schedule B.

Sch C-1

Exhibit A

FORM OF RESERVE LETTER

TO BE DELIVERED PURSUANT TO

SECTION 5(j)

This letter, which is written at the request of Whiting Petroleum Corporation (the “Company”), is being delivered to the Underwriters pursuant to the terms of an underwriting agreement between the Company and the Underwriters relating to the public offering of $1,100,000,000 aggregate principal amount of the Company’s senior notes due 2019 and $800,000,000 aggregate principal amount of the Company’s senior notes due 2021, which are being offered by the Company pursuant to the prospectus dated September 9, 2013 (the “Prospectus”).

Our report letter dated as of January 11, 2013 to the Company presented our estimates of Proved Reserves, Probable Reserves, Possible Reserves and Future Net Revenues (including discounted values thereof) attributable to interests of the Company as of December 31, 2012 (the “2012 Report”). In addition, we also delivered previous reports to the Company for the year ended December 31, 2010 and 2011 (the “Previous Reports”). The 2012 Report and the Previous Reports are collectively referred to in this letter as the “Reports”.

In connection with the foregoing, we hereby inform you as follows:

As of the date of this letter and as of the date of the Reports, we are and were independent reserve engineers with respect to the Company as provided in the standards pertaining to the estimating and auditing of oil and gas reserve information promulgated by the Securities and Exchange Commission (the “SEC”). Neither we, nor to our knowledge, any of our employees, officers or directors, own interests in the oil and gas properties included in the Reports. We have not been employed by the Company on a contingent basis.

All terms used in this letter, where applicable, conform to the definitions set forth in Rule 4-10 of Regulation S-X promulgated by the SEC.

The estimates of the Company’s Proved Reserves, Probable Reserves, Possible Reserves, Future Net Revenues and the discounted values of Future Net Revenues contained in the Reports, and the computations made in connection therewith, were, unless otherwise stated, made in accordance with the provisions of Rule 4-10 of Regulation S-X promulgated by the SEC and have been prepared in a manner consistent and in compliance with the standards and definitions pertaining to the estimating and auditing of oil and gas reserve information promulgated by the SEC.

The engineering projections included in the 2012 Report were based on the latest available production data, the majority through [•], 2012. Although we were not requested to review subsequent data concerning either the performance of the wells or field operations, no additional information has been brought to our attention that would lead us to believe that there would be a material change in the estimated Proved Reserves, Probable Reserves, Possible Reserves, or Future Net Revenues attributable to the Company’s interests reflected in the 2012 Report.

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You may rely upon our Reports in the same manner as if such report were addressed to you.

We hereby consent to the references to our firm and the use of the Reports as set forth in the Prospectus.

This letter is solely for the information of the addressees and to assist the addressees in documenting their investigations in connection with the offering of the securities covered by the Prospectus.

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WHITING PETROLEUM CORP - FORM 8-K - EX-1.1 - September 12, 2013

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WHITING PETROLEUM CORP Reports