China Oilfield Services 

China Oilfield Services Limited, together with its subsidiaries, provides integrated oilfield services in China, Indonesia, Mexico, Norway, the Middle East, and internationally. The company operates through four divisions: Geophysical Services, Drilling Services, Well Services, and Marine and Transportation Services. It offers drilling services, including drilling lift boats and accommodation and rigs; well services, such as directional drilling, logging, drilling and completion fluids, cementing, workover, production and optimization, and well completion; and geophysics and geotechnical surveying, as well as marine support vessels comprising anchor handling, towing, cargo (passenger) transportation, stand-by, and oil lifting assisting services. The company was incorporated in 2001 and is based in Sanhe, China. China Oilfield Services Limited is a subsidiary of China National Offshore Oil Corporation.