EXHIBIT 21.1

The following is a list of all of Pioneer Energy Services Corp.'s direct and indirect subsidiaries:

1. Pioneer Drilling Services, Ltd., a Texas corporation - 100% direct subsidiary.

2. Pioneer Global Holdings, Inc., a Delaware corporation - 100% indirect subsidiary-100% owned by Pioneer Drilling Services, Ltd.

3. Pioneer Services Holdings, LLC, a Delaware limited liability company - 100% indirect subsidiary-100% owned by Pioneer Global Holdings, Inc.

4. Pioneer Latina Group SDAD, Ltda., a Panama corporation - 100% indirect subsidiary-owned by Pioneer Global Holdings, Inc. (99%) and Pioneer Services Holdings, LLC (1%).

5. Pioneer de Colombia SDAD, Ltda., a Panama corporation - 100% indirect subsidiary-owned by Pioneer Latina Group SDAD, Ltda. (99%) and Pioneer Services Holdings, LLC (1%).

6. Pioneer de Colombia SDAD, Ltda., Surcusal Colombia, a Colombian branch - 100% indirect subsidiary-100% owned by Pioneer de Colombia SDAD, Ltda.

7. Proveedora Internacional de Taladros S.A.S - 100% indirect subsidiary-100% owned by Pioneer Global Holdings, Inc.

8. Pioneer Production Services, Inc., a Delaware corporation - 100% direct subsidiary.

9. Pioneer Wireline Services Holdings, Inc., a Delaware corporation - 100% indirect subsidiary-100% owned by Pioneer Production Services, Inc.

10. Pioneer Wireline Services, LLC, a Delaware limited liability company - 100% indirect subsidiary-100% owned by Pioneer Wireline Services Holdings, Inc.

11. Pioneer Well Services, LLC, a Delaware limited liability company - 100% indirect subsidiary-100% owned by Pioneer Production Services, Inc.

12. Pioneer Fishing & Rental Services, LLC, a Delaware limited liability company - 100% indirect subsidiary-100% owned by Pioneer Production Services, Inc.

13. Pioneer Coiled Tubing Services, LLC, a Delaware limited liability company - 100% indirect subsidiary-100% owned by Pioneer Production Services, Inc.