What do China Oilfield Services do?

Written by Editorial Team | Last Updated: August 2026

China Oilfield Services Limited (COSL) is a premier offshore oilfield services provider that delivers comprehensive drilling, well services, marine support, geophysical exploration, and geotechnical investigation services. Operating primarily in the offshore energy sector, the enterprise assists exploration and production companies in extracting oil and gas resources safely and efficiently across regional and international maritime fields.

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China Oilfield Services Limited (COSL) trades under the stock code 2883 on the Stock Exchange of Hong Kong.

China Oilfield Services Limited (COSL) provides comprehensive offshore oil and natural gas exploration, development, and production services.

China's major petroleum and hydrocarbon oil fields are strategically distributed across several massive sedimentary basins located in the northern, northeastern, and western regions of the country, as well as significant offshore tracts.