Our History

19 July 2013

COSL Canada was established in Calgary, Alberta.

29 September 2008

China Oilfield Services Limited completed the acquisition of Awilco Offshore ASA successfully

28 October 2007

China Oilfield Services Limited was successfully listed on Shanghai stock exchange.

26 March 2004

The stocks of China Oilfield Services Limited can be traded by means of levelⅠunlisted American Depositary Receipts "ADRs" at OTC over-the-counter market in the United States. The ticker symbol is CHOLY.

20 November 2002

China Oilfield Services Limited was successfully listed on mainboard of HongKong stock market.

China Oilfield Services Limited was successfully listed on mainboard of HongKong stock market.

26 September 2002

Our Company Was Restructured into a Joint Stock Limited Liability Company

With the approval of the PRC Government, COSL was officially chartered with State Administration for Industry and Commerce.

29 December 2001

CNOOC Incorporated Two Shipping Companies into One

CNOOC combined two marine support and transportation subsidiaries, CHina Offshore Oil Southern Shipping Company and China Offshore Oil Northern Shipping Company, into one entity.

25 December 2001

CNOOC Incorporated CNOOCS as the Operating Company

Prior to December 2001, CNOOC provided drilling, well and geophysical services primarily through five PRC wholly owned subsidiaries, namely, China Offshore Oil Southern Drilling Company, China Offshore Oil Northern Drilling Company, China Offshore Geophysical Company Limited, China Offshore Logging Company Limited and CNOOC Petrotech Services Company. On December 25, 2001, CNOOC incorporated these five companies as the operating company CNOOCS for the business operations that perform drilling, well and geophysical services.

15 February 1982

China National Offshore Oil Corporation CNOOC, PRC State-owned Enterprise Established