COSL is an all-round offshore oilfield services company that possesses a comparatively complete service chain and covers every phase of oil and gas exploration, development, and production. COSL has become one of the few integrated oilfield services providers that can provide integrated and turnkey services to customers wordwide.With a reliable guarantee of experienced elite staff, COSL is capable of providing integrated services for drilling design, budget planning, field operations and well completion reporting, site surveying, towing, positioning, drilling, cementing, mud servicing, wire-line logging, directional drilling, mud logging, well completion servicing, acid and fracture servicing, EOR, well testing, coring, ROV, fishing,communicating, and other industry-related tasks, all of which are designed to effectively control risk factors and costs and enable COSL to successfully satisfy clients time-sensitivity and cost-reduction requirements. A partial list of COSL's past clients, both domestic and international include CNOOC, Petro China, Sinopec, Devon Energy, Prime Line, ENI, Husky Oil and Roc Oil.