About: China Oilfield Services is an oilfield service. It is a majority owned subsidiary of Chinese state owned company CNOOC Group. It also has a listed sister company in Hong Kong, CNOOC Limited


Key Services: It has four major business segments of geophysical services, drilling services, well services and marine & transportation services covering the exploration, development and production phases of oil and gas industry, COSL is an all-round offshore oilfield service company with integrated functions and bundled service chain in China and even in the world.


Project Experience Includes:COSL possesses the largest fleet of offshore oilfield services facilities in China. To the end of 2013 , COSL operated 40 drilling rigs of which 30 are jack-up drilling rigs and 10 are semi-submersible drilling rigs, 2 accommodation rigs and 4 module rigs. In addition, COSL also owns and operates the largest and most diverse fleets in offshore China, including 69 working vessels and 3 oil tankers, 4 chemical carriers,7 seismic vessels,2 OBC teams, 7 surveying vessels, and a vast array of modern facilities and equipment for logging, drilling fluids, directional drilling, cementing and well work-over services.