1.Schlumberger India Technology Centre Private Limited
2.Asian Energy Services Limited
3.HSL Asia Limited
4.Alphageo (India) Limited
5.Halliburton India Operations Pvt. Ltd.
6.OGD Services Limited
7.Petrofac Engineering Services India Private Limited
8.Baker Hughes Oilfield Services India Private Limited
9.Oil States Industries (India) Private Limited
10.Fluor Daniel India Private Limited