Integrated Services

COSL offers a wide range of oilfield services through four business segments, namely geophysical and surveying services, drilling services, well services, marine support services segments. COSL has a unique integrated business model offering individual service and packaged services that involve various phases of offshore oil and gas exploration, development and production, from geophysical surveys to drilling, well completion and to supporting oil and gas production activities, such as offshore marine support. COSL believes its integrated services model can bring benefit to clients by efficiency improvement and cost savings.

Geophysical and Surveying Services

Being a major provider of geophysical and surveying services in offshore China , as well as an important participant in the international market

Owning and operating six seismic vessels, two OBC teams and five engineering survey vessels

Providing marine seismic acquisition, geo-surveying, seismic data processing & interpretation and underwater engineering services

Drilling Services

Being a major drilling services provider in offshore China, as well as an important international drilling participant

Operating and managing forty-five drilling rigs (thirty-three jack-up rigs, twelve semi-submersible rigs),two accommodation rigs and five modular rigs, one 5000-feet semi-submersible rig is under construction

Providing offshore drilling, module rig drilling and drilling rig management services


Well Services

Being a major oilfield services provider in offshore China

Providing comprehensive well services: logging, drilling and completion fluids, directional drilling, mud logging, well testing, cementing, well completion, workover and oilfield production optimization


Marine Support Services

Owing and operating the largest and most comprehensive offshore utility fleet in Offshore China

More than 130 marine support vessels, including anchor-handling tug/supply vessels (AHTS), platform supply vessels (PSV), multi-purpose vessels, barges, and shuttle-tankers

Providing anchor handling, towing, supplying, oil lifting, transportation, stand-by vessel (guard-ship), firefighting, rescue, oil-spill assistance and workover support.