Annual Results 2010 Analyst Presentation

China Oilfield Services Limited COSL or the Company , HKSE stock code: 2883, SSE stock code: 601808 cordially invites you or your representative to an analyst presentation to be held on 23 March 2011 Wednesday in respect of the Company s Annual Results 2010.

COSL is the leading integrated oilfield services provider in the offshore China market. Its services cover and put together each phase of offshore oil and gas exploration, development and production. Its four core business segments are geophysical services, drilling services, well services and marine support services.

COSL publicly offered H shares which were listed on the Main Board of the Stock Exchange of Hong Kong Limited since 20 November, 2002 under the ticker 2883. Since 26 March, 2004, COSL's stocks can be traded by means of Level I unlisted American Depositary Receipts at OTC over-the-counter market in the United States under the ticker CHOLY.

COSL listed its A shares on Shanghai Stock Exchange under the ticker 601808 since 28 September, 2007.

At the Analyst Presentation, senior management of COSL will share with you the highlights of the Company Annual Results 2010 as well as its latest business development and future strategies.

Details of the Presentation are as follows:

Date : 23 March 2011 Wednesday

Time : 10:00 a.m.

Venue : Harbour View Ballroom II&III, Level 4,

Four Seasons Hotel, 8 Finance Street, Central, Hong Kong

* Consecutive interpretation to both Mandarin and English will be provided during the Q&A session.

For confirmation, please fill in the attached reply slip and fax it to Ivy Wong/ Jenny Fang of iPR Ogilvy Ltd at 852 3170 6606 or 852 2136 6068. For immediate enquiries, please call 852 2136 6185.