China Oilfield Services Limited, together with its subsidiaries, provides integrated oilfield services in China, Indonesia, Mexico, Norway, Rest of 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 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, production increase and resource material integration, and other services. The Geophysical exploration and engineering survey services segment offers seismic exploration and engineering survey services. Its Ship services provides transportation of materials, cargo and personnel, maritime protection, and relocation and positioning of drilling platforms and offshore engineering services. It also provides vessels towing and anchoring services and transport 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.