Exhibit 21.1
Subsidiaries of the Registrant
Name |
| State of Incorporation or organization |
Ambar Lone Star Fluid Services LLC |
| Texas |
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 (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 |
Universal Pressure Pumping, Inc. |
| Delaware |
Universal Well Services, Inc. |
| Delaware |