Attached files

file filename
10-K - PTEN-10K-20161231 - PATTERSON UTI ENERGY INCpten-10k_20161231.htm
EX-32.1 - EX-32.1 - PATTERSON UTI ENERGY INCpten-ex321_7.htm
EX-31.2 - EX-31.2 CERTIFICATION OF CHIEF FINANCIAL OFFICER - PATTERSON UTI ENERGY INCpten-ex312_9.htm
EX-31.1 - EX-31.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER - PATTERSON UTI ENERGY INCpten-ex311_8.htm
EX-23.1 - EX-23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM. - PATTERSON UTI ENERGY INCpten-ex231_10.htm
EX-10.31 - EX-10.31AMENDMENT NO. 3 TO CREDIT AGREEMENT - PATTERSON UTI ENERGY INCpten-ex1031_889.htm
EX-10.20 - EX-10.20 EMPLOYMENT AGREEMENT - PATTERSON UTI ENERGY INCpten-ex1020_888.htm

Exhibit 21.1

Subsidiaries of the Registrant

 

Name

 

State of

Incorporation or

organization

Ambar Lone Star Fluid Services LLC

 

Texas

Drilling Technologies 1 LLC

 

Delaware

Drilling Technologies 2 LLC

 

Delaware

Patterson Petroleum LLC

 

Texas

Patterson UTI Energy Arabia DMCC

 

UAE

Patterson UTI International Saudi Arabia Limited

 

Kingdom of Saudi Arabia

Patterson-UTI Drilling Canada Limited

 

Nova Scotia

Patterson-UTI Drilling Company LLC

 

Texas

Patterson-UTI Drilling International, Inc.

 

Delaware

Patterson-UTI International (Netherlands) Coöperatief U.A.

 

The Netherlands

Patterson-UTI International Holdings (BVI) Limited

 

British Virgin Islands

Patterson-UTI International Holdings (Netherlands) One B.V.

 

The Netherlands

Patterson-UTI International Holdings (Netherlands) Two B.V.

 

The Netherlands

Patterson-UTI International Holdings GP (BVI), Inc.

 

British Virgin Islands

Patterson-UTI International Holdings GP 1 LLC

 

Delaware

Patterson-UTI International Holdings, Inc.

 

Delaware

Patterson-UTI International (India) B.V.

 

The Netherlands

Patterson-UTI International (Kuwait) Limited

 

British Virgin Islands

Patterson-UTI Management Services, LLC

 

Delaware

PTEN International Holdings (Netherlands) 1 C.V.

 

The Netherlands

PTEN International Leasing (Netherlands) 2 C.V.

 

The Netherlands

Pyramid Merger Sub, Inc.

 

Delaware

Universal Pressure Pumping, Inc.

 

Delaware

Universal Well Services, Inc.

 

Delaware

Warrior Rig Technologies Limited

 

Alberta

Warrior Rig Technologies US LLC

 

Delaware