China Oilfield Services Limited, together with its subsidiaries, provides integrated oilfield services in China, Indonesia, Mexico, Norway, the Rest of the Middle East, and internationally. It operates through four segments: Geophysical exploration and engineering survey Services, Drilling Services, Oilfield technical services, and Ship services. The company's Drilling services segment offers various drilling services. Its Oilfield technical services segment provides complete oilfield technical services, including well logging, drilling fluid, directional well, cementing and completion, stimulation and data integration and other services. The Geophysical exploration and engineering survey services segment offers seismic exploration and engineering survey services. Its Ship services provide transportation of materials, cargo and personnel, maritime guarding and relocation and positioning of drilling platforms. It also provides vessel towing and anchoring services and transports crude oil and refined oil and gas products. China Oilfield Services Limited was incorporated in 2001 and is based in Sanhe, China. China Oilfield Services Limited is a subsidiary of China National Offshore Oil Corporation.