Exhibit 99.2

Second-Quarter 2011 Results—Supplemental Information

1)		What were multiclient sales in the second quarter of 2011?
		Multiclient sales, including transfer fees, were $187 million in the second quarter of 2011.
2)		What was the WesternGeco backlog at the end of the second quarter of 2011?
		WesternGeco backlog, which is based on signed contracts with customers, was approximately $824 million at the end of the second quarter of 2011.
3)		What were the Schlumberger pretax and after-tax returns-on-sales for the second quarter of 2011, excluding charges?
		The Schlumberger pretax return on sales, excluding charges, was 16.4% for the second quarter of 2011 versus 14.6% for the first quarter of 2011.
		The Schlumberger after-tax return on sales, excluding charges, was 12.3% for the second quarter of 2011 versus 11.2% for the first quarter of 2011.
4)		What was the Schlumberger Net Debt† at the end of the second quarter of 2011?
		Net debt was $4.3 billion at June 30, 2011—$320 million higher than at the end of the previous quarter.
		Liquidity was used primarily due for stock repurchases of $707 million and capital expenditures of $951 million during the quarter, offset in part by $385 million from divestiture of Global Connectivity Services.

†		Net Debt represents gross debt less cash, short-term investments and fixed income investments, held to maturity.

5)		What was included in “Interest and other income, net” for the second quarter of 2011?
		“Interest and other income, net” for the second quarter of 2011 consisted of the following:

		($ millions)
Equity in net earnings of affiliated companies		$	20
Interest Income			9
		$	29

6)		How did interest income and interest expense change during the second quarter of 2011?
		Interest income of $9 million was down $1 million sequentially. Interest expense of $69 million decreased $5 million sequentially.
7)		Why was there a difference between the consolidated Schlumberger pretax income and the total pretax income of Oilfield Services and Distribution?
		The difference consisted of such items as corporate expenses and interest income and interest expense not allocated to the segments, as well as interest on postretirement medical benefits, stock-based compensation expense and the amortization expense associated with intangible assets recorded in connection with the Smith merger.
8)		What was the effective tax rate (ETR), excluding charges, for the second quarter of 2011?
		The ETR for the second quarter of 2011 was 24.8% compared to 23.6% in the prior quarter, excluding charges in both periods.
		The ETR for full-year 2011 is expected to be in the mid twenties, although some volatility may be experienced in the ETR on a quarterly basis primarily due to the geographic mix of earnings.
9)		What is the capex guidance for 2011?
		Schlumberger capex is expected to approach $4.2 billion for the full-year 2011. Capex in 2010 was $2.91 billion.
10)		How was the segment reporting changed in the first quarter of 2011?
		Beginning with the first quarter of 2011, Schlumberger’s primary reporting is based on the three Product Groups: Reservoir Characterization, Drilling and Reservoir Production. These three groups comprise what is now referred to as “Oilfield Services”. In addition, we now report our Distribution business as a separate and distinct segment. Geographical results now reflect the results of all three of the Groups, including the legacy Smith Oilfield and M-I SWACO businesses. Furthermore, the results of WesternGeco are also now included in both the Group and Geographic results and are no longer reported separately. The Distribution business, which is predominantly North American-centric, is not included in the geographic results.
		All prior period amounts have been restated to conform to the new structure.

D)		Non-GAAP Financial Measures
		In addition to financial results determined in accordance with generally accepted accounting principles (GAAP), this document also includes non-GAAP financial measures (as defined under SEC Regulation G). The following is a reconciliation of these non-GAAP measures to the comparable GAAP measures:

( Stated in millions except per share amounts )

		Second Quarter 2011
										Noncont.								Diluted
		Pretax				Tax				Interest				Net				EPS
Schlumberger income from continuing operations, as reported		$	1,498			$	374			$	5			$	1,119			$	0.82
Merger and integration costs			32				8				—				24				0.02
Donation to Schlumberger Foundation			50				10				—				40				0.03
Schlumberger income from continuing operations, excluding charges		$	1,580			$	392			$	5			$	1,183			$	0.87

		Second Quarter 2011
						Excluding
		GAAP				Charges
Pretax return on sales			15.6	%			16.4	%
After tax return on sales			11.6	%			12.3	%
Effective tax rate			25.0	%			24.8	%

( Stated in millions except per share amounts )

		First Quarter 2011
										Noncont.								Diluted
		Pretax				Tax				Interest				Net				EPS
Schlumberger income from continuing operations, as reported		$	1,238			$	295			$	(1	)		$	944			$	0.69
Merger and integration costs			34				6				—				28				0.02
Schlumberger income from continuing operations, excluding charges		$	1,272			$	301			$	(1	)		$	972			$	0.71

		First Quarter 2011
						Before
		GAAP				Charges
Pretax return on sales			14.2	%			14.6	%
After tax return on sales			10.8	%			11.2	%
Effective tax rate			23.8	%			23.6	%

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This document, the second-quarter 2011 earnings release and other statements we make contain “forward-looking statements” within the meaning of the federal securities laws, which include any statements that are not historical facts, such as our forecasts or expectations regarding business outlook; growth for Schlumberger as a whole and for each of its segments (and for specified products or geographic areas within each segment); oil and natural gas demand and production growth; oil and natural gas prices; operating margins; Schlumberger’s effective tax rate; improvements in operating procedures and technology; capital expenditures by Schlumberger and the oil and gas industry; the business strategies of Schlumberger’s customers; future global economic conditions; and future results of operations. These statements are subject to risks and uncertainties, including, but not limited to, current global economic conditions; changes in exploration and production spending by Schlumberger’s customers and changes in the level of oil and natural gas exploration and development; general economic and business conditions in key regions of the world; pricing erosion; seasonal factors; the ability of the oilfield service industry to meet activity levels; changes in government regulations and regulatory requirements, including those related to offshore oil and gas exploration, radioactive sources, explosives, chemicals, hydraulic fracturing services and climate-related initiatives; operational delays or program reductions in the Gulf of Mexico; and other risks and uncertainties detailed in our second quarter 2011 earnings release, our most recent Form 10-K and other filings that we make with the Securities and Exchange Commission. If one or more of these risks or uncertainties materialize (or the consequences of such a development changes), or should underlying assumptions prove incorrect, actual outcomes may vary materially from those forecasted or expected. Schlumberger disclaims any intention or obligation to update publicly or revise such statements, whether as a result of new information, future events or otherwise.

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