Exhibit 21.1

SUBSIDIARIES OF BASIC ENERGY SERVICES, INC.

Name of Subsidiary	Jurisdiction of Formation	Effective Ownership
Basic Energy Services GP, LLC	Delaware	Basic Energy Services, Inc. — 100%
Basic Energy Services LP, LLC	Delaware	Basic Energy Services, Inc. — 100%
Basic Energy Services L.P.	Delaware	Basic Energy Services LP, LLC — 99.99% Basic Energy Services GP, LLC — 0.01%
Basic Marine Services, Inc.	Delaware	Basic Energy Services L.P. — 100%
First Energy Services Company	Delaware	Basic Energy Services L.P. — 100%
Oilwell Fracturing Services, Inc.	Oklahoma	Basic Energy Services L.P. — 100%
LeBus Oil Field Service Co.	Texas	Basic Energy Services L.P. — 100%
Globe Well Service, Inc.	Texas	Basic Energy Services L.P. — 100%
SCH Disposal, L.L.C.	Texas	Basic Energy Services L.P. — 100%
JS Acquisition LLC	Delaware	Basic Energy Services L.P. — 100%
JetStar Consolidated Holdings, Inc.	Delaware	JS Acquisition LLC — 100%
Acid Services, LLC	Kansas	JS Acquisition LLC — 100%
JetStar Energy Services, LLC	Texas	JS Acquisition LLC — 100%
Sledge Drilling Corporation	Texas	Basic Energy Services L.P. — 100%
Wildhorse Services, Inc.	Oklahoma	Basic Energy Services L.P. — 100%