EX-21 2 pten-ex21_1.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 Drilling Canada Limited |  | Nova Scotia |
Patterson-UTI Drilling Company LLC |  | Texas |
Patterson-UTI Drilling International, Inc. |  | Delaware |
Patterson-UTI Holding Company LLC |  | Delaware |
Patterson-UTI International (Argentina) S.R.L. |  | Argentina |
Patterson-UTI International (Colombia) Ltda. S. de R.L. |  | Colombia |
Patterson-UTI International (Colombia) Ltda. S. de R.L. |  | Panama |
Patterson-UTI International (Ecuador) S.A.S. |  | Ecuador |
Patterson-UTI International Holdings (BVI) Limited |  | British Virgin Islands |
Patterson-UTI International Holdings, Inc. |  | Delaware |
Patterson-UTI International Holdings (Netherlands) One B.V. |  | The Netherlands |
Patterson-UTI International Holdings (Netherlands) Two B.V. |  | The Netherlands |
Patterson-UTI International (India) B.V. |  | The Netherlands |
Patterson-UTI International (Kuwait) Limited |  | British Virgin Islands |
Patterson-UTI International (Netherlands) B.V. |  | The Netherlands |
Patterson-UTI Management Services, LLC |  | Delaware |
Pioneer Coiled Tubing Services, LLC |  | Delaware |
Pioneer Drilling Services, LLC |  | Texas |
Pioneer Energy Services LLC |  | Delaware |
Pioneer Fishing & Rental Services, LLC |  | Delaware |
Pioneer Global Holdings, Inc. |  | Delaware |
Pioneer Latina Group SDAD, Ltda. |  | Panama |
Pioneer Production Services, Inc. |  | Delaware |
Pioneer Services Holdings, LLC |  | Delaware |
Proveedora Internacional de Taladros S.A.S |  | Colombia |
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 |
Universal Wireline LLC |  | Delaware |
Warrior Rig Technologies Limited |  | British Columbia |
Warrior Rig Technologies US LLC |  | Delaware |
Western Wisconsin Sand Company, LLC |  | Wisconsin |