COSL (CHINA OILFIELD SERVICES LIMITED) is a leading integrated oilfield services provider in offshore market. COSL’s four main services divisions – Drilling Services, Well Services, Geophysical Services, and Marine and Transportation Services – cover the exploration, development, and production phases of the oil and gas industry.

COSL owns and operates a large drilling fleet comprised of 44 Jack-up rigs and 15 semi-submersible drilling rigs, with operating water depth from 15ft to 10,000ft and drilling depth up to 30,000ft.

COSL has managed and operated sets of land drilling rigs (2000HP) and workover rigs (750 HP and 1000HP), both of which have the drilling capacity at a depth of 10,000 to 20,000 ft.

Through continuous input in technology research and development, advances technological facilities, R&D Centre and an excellent management team, COSL provides comprehensive onshore and offshore well services, including logging, drilling & completion fluids, directional drilling (LWD&RSS), cementing, well completion, well workover, oilfield production optimization, and drilling waste management.

COSL owns and operates the most capable, the largest and the most diverse marine support vessels fleet in China, with over 140 vessels including AHTS vessels, standby vessels, platform supply vessels, multi-purpose vessels and barges. COSL can provide comprehensive support and services, including anchor handling for different water depths, towing of drilling rigs/engineering barges, offshore transportation, standby, firefighting, rescue, oil spill response, for offshore oil and gas exploration, development, construction and oil/gas field production, which can fulfil different needs of clients. At present, COSL has 4 LNG-fuelled AHTS and 8 LNG-fuelled PSVs under construction and is targeting to put the new build into service in the second half of 2021. LNG-fuelled vessels are the combination of both environmentally friendly operation while having its focus on improving fuel economy.

COSL is also the major supplier for China offshore geophysical and surveying services, meanwhile a solid competitor in the worldwide marine seismic market, who is committed to delivering high-quality, efficient and innovative services both locally and globally. COSL offers its customers integrated geophysical and surveying services, including survey design and evaluation, geophysical data acquisition, seismic data processing and interpretation, reservoir study and engineering surveying.

COSL’s high-quality services cover the entire oilfield life cycle and the full value chain of the oilfield service industry, from exploring for oil and gas deposits to collecting and processing geological data to drilling, well completion and to supporting oil and gas production activities, such as offshore marine support. By offering comprehensive services involving the entire oilfield life cycle and the full value chain of the oilfield service industry, COSL is able to provide clients integrated project management service, or IPM service, that packages and customizes the various services and products to meet customer’s specific requirements.

Based on 40 years offshore experience, COSL have provided offshore drilling services, and drilling rig management services to various international clients in most of the major oilfield areas of the world, including the Far East, the South East Asia, the Middle East, West Africa, Europe and America, covering about 30 countries, such as Saudi, Indonesia, Oman, Nigeria, Norway, Mexico, etc. Our clients extend up to major IOCs and NOCs of the industry, such as Shell, BP, Husky, Chevron, Statoil, Saudi Aramco, Kuwait Oil Company, Petronas Carigali, PEMEX, PTTEP, Daewoo, Rosneft, Gazprom, and Santos, etc.