EX-21 2 pten-ex211_201412316.htm EX-21.1

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 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 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