EXHIBIT 21.1

The following is a list of all of Pioneer Drilling Companys direct and indirect subsidiaries:



| | 1. | Pioneer Drilling Services, Ltd., a Texas corporation100% direct subsidiary.
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| | 2. | Pioneer Global Holdings, Inc., a Delaware corporation100% indirect subsidiary100% owned by Pioneer Drilling Services, Ltd.
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| | 3. | Pioneer Services Holdings, L.L.C., a Delaware limited liability company100% indirect subsidiary100% owned by Pioneer Global Holdings,
Inc.
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| | 4. | Pioneer Latina Group SDAD, Ltda., a Panama corporation100% indirect subsidiaryowned by Pioneer Global Holdings, Inc. (99%) and
Pioneer Services Holdings, L.L.C. (1%).
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| | 5. | PDC Holdings de Mexico, S. de R.L. de C.V.100% indirect subsidiaryowned by Pioneer Global Holdings, Inc. (99%) and Pioneer Services
Holdings, L.L.C. (1%).
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| | 6. | PDC Logistics de Mexico, S. de R.L. de C.V.100% indirect subsidiaryowned by PDC Holdings de Mexico, S. de R.L. de C.V. (99.9%) and
Pioneer Services Holdings, L.L.C. (0.1%).
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| | 7. | PDC Drilling Mexicana, S. de R.L. de C.V.100% indirect subsidiaryowned by PDC Holdings de Mexico, S. de R.L. de C.V. (99.9%) and
Pioneer Services Holdings, L.L.C. (0.1%).
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| | 8. | Pioneer de Colombia SDAD, Ltda., a Panama corporation100% indirect subsidiaryowned by Pioneer Latina Group SDAD, Ltda. (99%) and
Pioneer Services Holdings, L.L.C. (1%).
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 9. | Pioneer de Colombia SDAD, Ltda., Surcusal Colombia, a Colombian branch100% indirect subsidiary100% owned by Pioneer de Colombia SDAD,
Ltda.
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| | 10. | Proveedora Internacional de Taladros S.A.S100% indirect subsidiary100% owned by Pioneer Global Holdings, Inc.
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| | 11. | Pioneer Production Services, Inc., a Delaware corporation100% direct subsidiary.
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| | 12. | Pioneer Wireline Services Holdings, Inc., a Delaware corporation100% indirect subsidiary100% owned by Pioneer Production Services, Inc.
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| | 13. | Pioneer Wireline Services, L.L.C., a Delaware limited liability company100% indirect subsidiary100% owned by Pioneer Wireline Services
Holdings, Inc.
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| | 14. | Pioneer Well Services, L.L.C., a Delaware limited liability company100% indirect subsidiary100% owned by Pioneer Production Services,
Inc.
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| | 15. | Pioneer Fishing & Rental Services, L.L.C., a Delaware limited liability company100% indirect subsidiary100% owned by Pioneer
Production Services, Inc.
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