Exhibit 21.1

OIL STATES INTERNATIONAL, Inc.
SUBSIDIARIES

SUBSIDIARY	STATE/COUNTRY
Capstar Drilling, L.L.C.	Delaware
Crown Camp Services Ltd.	Alberta, Canada
General Marine Leasing, L.L.C.	Delaware
Oil States Energy Services, Inc.	Delaware
Oil States Industries, Inc.	Delaware
Oil States Industries (Asia) Pte Ltd	Singapore
Oil States Industries (UK) Limited	United Kingdom
Oil States Skagit SMATCO L.L.C.	Delaware
PTI Group, Inc.	Alberta, Canada
PTI Premium Camp Services Ltd.	Alberta, Canada
Sooner, Inc.	Delaware
Sooner Pipe, L.L.C.	Delaware
Stinger Wellhead Protection, Incorporated	Texas
Stinger Wellhead Protection (Canada) Incorporated	Alberta, Canada
A-Z Terminal Corporation	Oklahoma
Specialty Rental Tools & Supply, L.L.C.	Delaware
PTI Travco Modular Structures Ltd.	Alberta, Canada
PTI Noble Structures, Inc.	Alberta, Canada
Schooner Petroleum Services, Inc.	Delaware
Well Testing, Inc.	Delaware