EXHBIT 21.1

OIL STATES INTERNATIONAL, Inc.

SUBSIDIARIES

SUBSIDIARY	STATE/COUNTRY
Acute Technological Services, Inc.	Texas
Capstar Holding, L.L.C.	Delaware
Crown Camp Services Ltd.	Alberta, Canada
General Marine Leasing, L.L.C.	Delaware
MAC Investments, LLC	Delaware
Oil States Energy Services Holding, Inc.	Delaware
Oil States Energy Services L.L.C.	Delaware
Oil States Industries, Inc.	Delaware
Oil States Industries (Asia) Pte Ltd.	Singapore
Oil States Industries (UK) Limited	United Kingdom
OIS Accommodations SpinCo Inc.	Delaware
Oil States Skagit SMATCO L.L.C.	Delaware
OSES International, LLC	Delaware
PTI Group, Inc.	Alberta, Canada
PTI Group USA, L.L.C.	Delaware
PTI Noble Structures, Inc.	Alberta, Canada
PTI Travco Modular Structures Ltd.	Alberta, Canada
PTI Premium Camp Services Ltd.	Alberta, Canada
PTI USA Manufacturing L.L.C.	Delaware
Stinger Wellhead Protection (Canada) Incorporated	Alberta, Canada
Tempress Technologies, Inc.	Washington
The MAC Services Group Ltd.	Australia