- Vietsovpetro Joint Venture (VSP)
- Premier Oil Vietnam Offshore B.V.
- Hoang Long & Hoan Vu Joint Operating Company (HL & HV JOC)
- Thang Long Joint Operating Company (TLJOC)
- Truong Son Joint Operating Company (TSJOC)
- Korea National Oil Corporation Vietnam (KNOC)
- Aquaterra Energy / Dai Hung - VSP Project
- M-I Drilling Fluids Vietnam
- Halliburton International Inc. / Halliburton Energy (HLL)
- BJ Services - PV Drilling Joint Venture Com. Ltd. (BJ)
- Weatherford Asia Pacific (WAP)
- Seadrill Management Pte. Ltd.
- Diamond Offshore General Company
- Transocean Sedco Forex International Inc.
- Premium Drilling (CAYMAN) Ltd.
- Expro Group
- Schlumberger Vietnam Services