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 International (Argentina) S.R.L. |
| Argentina |
|
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 Holding Company LLC |
| Delaware |
|
Patterson-UTI Management Services, LLC |
| Delaware |
|
Pioneer Coiled Tubing Services, LLC |
| Delaware |
|
Pioneer de Colombia SDAD, Ltda. |
| Panama |
|
Pioneer de Colombia SDAD, Ltda., Surcusal Colombia |
| Colombia |
|
Pioneer Energy Services LLC |
| Delaware |
|
Pioneer Drilling Services, LLC |
| Texas |
|
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 |
|