| | | | | |
| Subsidiaries of the Registrant |
| |
| Entity | State/Country |
| Ambar Lone Star Fluid Services LLC | Texas |
| Black Gold Oilfield Services | Ecuador |
| BEP Ulterra Holdings, Inc. | Delaware |
| BEP Ulterra Intermediate Holdings, Inc. | Delaware |
| Current Power Solutions, Inc. | Texas |
| Drilling Technologies 1 LLC | Delaware |
| Drilling Technologies 2 LLC | Delaware |
| ESP Completion Technologies, LLC | Texas |
| ESP Completion Technologies SA | Panama |
| Great Plains Oilfield Rental, L.L.C. | Oklahoma |
| Keane Group Holdings, LLC | Delaware |
| Keane International Holdings, LLC | Delaware |
| Keystone Rock & Excavation, L.L.C. | Oklahoma |
| KGH Intermediate Holdco I, LLC | Delaware |
| KGH Intermediate Holdco II, LLC | Delaware |
| Mobile Data Technologies Ltd. | Alberta, Canada |
| MS Directional, LLC | Texas |
| NexTier Completion Solutions Inc. | Delaware |
| NexTier Holding Co. | Delaware |
| NexTier Integrated Services LLC | Delaware |
| NexTier International LLC | Delaware |
| NexTier Oilfield Solutions LLC | Delaware |
| Patterson Petroleum LLC | Texas |
| Patterson-UTI Drilling Canada Limited | Nova Scotia, Canada |
| Patterson-UTI Drilling Company LLC | Texas |
| Patterson-UTI Drilling International, Inc. | Delaware |
| Patterson-UTI Holding Company LLC | Delaware |
| Patterson-UTI International Arabian Gulf Oil & Gas Investment – L.L.C. – S.P.C | Abu Dhabi |
| Patterson-UTI International (Argentina) S.R.L. | Argentina |
| Patterson-UTI International (Colombia) Ltda. S. de R.L. | Panama |
| Patterson - UTI International (Colombia) Ltda. S. de R.L. Sucursal Colombia | Colombia |
| Patterson-UTI International (Ecuador) S.A.S. | Ecuador |
| Patterson-UTI International Holdings, Inc | Delaware |
| Patterson-UTI International (Kuwait) Limited | British Virgin Islands |
| Patterson-UTI International Resources LLC | Delaware |
| Patterson-UTI TW Holdings LLC | Delaware |
| Patterson-UTI TW Services LLC | Delaware |
| Patterson-UTI Management Services, LLC | Delaware |
| Penny Global Leasing Sarl | Luxembourg |
| Pioneer Coiled Tubing Services, LLC | Delaware |