Geophysical-China Oilfield Services Ltd.

Main business: marine seismic acquisition, seismic data processing & interpretation, geo-technical survey, subsea engineering, groundwork and foundation construction engineering, HQI-Seis and HQI-POCO system

Marketing Contact: Mr. Xia Yu

Marketing Manager of Geophysical-COSL

Tel: +86-22-5955 2220 

E-mail: xiayu2@cosl.com.cn


Drilling-China Oilfield Services Ltd.

Main business: offshore drilling, integrated drilling, casing & tubing running, pipe inspection & repair, rig management 

Marketing Contacts: Mr. Zhang Fangyi

Marketing Manager of Drilling-COSL

Tel: +86-10-8452 2511 

E-mail: zhangfy2@cosl.com.cn


WellTech -China Oilfield Services Limited

Main business: directional drilling, open-hole wireline logging, VSP, MWD, LWD, cased-hole logging, data processing & interpretation, 

Marketing Contact: Mr. Wei Xi

Marketing Manager of WellTech-COSL

Tel: +86-10-84522835

Email: weixi@cosl.com.cn


Oilfield Chemicals-China Oilfield Services Limited

Main business: drilling & completion fluids, cementing, solids control, drilling waste management, chemical products

Marketing Contact: Mr. Sun Gang

Marketing Manager of Oilfield Chemicals-COSL

Tel: +86-10-8452 2465

E-mail: sungang@cosl.com.cn


Shipping -China Oilfield Services Limited

Main business: marine support services-AHTS, PSV, multifunctional vessels, barges and shuttle tankers

Marketing Contact: Mr. Zhao Changkui

Marketing Manager of Shipping-COSL

Tel.: +86-10-8452 2463

Email: zhaochk@cosl.com.cn


Production Optimization-China Oilfield Services Limited

Main business: workover, production & optimization, completion service & products, liftboat operation 

Marketing Contact: Mr.Fang GuoYin

Marketing Director of Production Optimization-COSL

Tel:+86-22-5955 1839

Email:fanggy@cosl.com.cn