EX-21.1 3 pten-ex211_11.htm EX-21.1

Exhibit 21.1

Subsidiaries of the Registrant

Name |  | State of Incorporation or organization
Ambar Lone Star Fluid Services LLC |  | Texas
Current Power Solutions, Inc. |  | Texas
Drilling Technologies 1 LLC |  | Delaware
Drilling Technologies 2 LLC |  | Delaware
Great Plains Oilfield Rental, L.L.C. |  | Oklahoma
Keystone Rock & Excavation, L.L.C. |  | Oklahoma
MS Directional, LLC |  | Texas
Patterson Petroleum LLC |  | Texas
Patterson UTI Energy Arabia DMCC |  | Dubai Multi Commodities Centre
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 Global Resources Management Office Limited |  | Dubai International Financial Centre
Patterson-UTI International (Netherlands) B.V. |  | 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, Inc. |  | Delaware
Patterson-UTI International (India) B.V. |  | The Netherlands
Patterson-UTI International (Kuwait) Limited |  | British Virgin Islands
Patterson-UTI Management Services, LLC |  | Delaware
PTL Prop Solutions, L.L.C. |  | Oklahoma
Seventy Seven Energy LLC |  | Delaware
Seventy Seven Land Company LLC |  | Oklahoma
Seventy Seven Operating LLC |  | Oklahoma
Superior QC, LLC |  | Delaware
Universal Pressure Pumping, Inc. |  | Delaware
Warrior Rig Technologies Limited |  | Alberta
Warrior Rig Technologies US LLC |  | Delaware
Western Wisconsin Sand Company, LLC |  | Wisconsin