Malfunction Occurred on the Single Point Mooring System of Haiyangshiyou 102

HONG KONG, April 22, 2011 /PRNewswire-Asia/ -- CNOOC Limited (the "Company" , NYSE: CEO, SEHK: 0883) announced today that, a malfunction occurred on the single point mooring system of the Floating, Production, Storage and Offloading (FPSO) vessel "Haiyangshiyou 102" serving in the Bohai Bay due to rough sea conditions. Operations were immediately shut down at the affected oilfields.

Till now, the "Haiyangshiyou 102" FPSO has been safely secured and tugged to safe area. There were no injuries during the process and no oil spill was found. The Company is actively working on the recovery plan to resume production as early as possible.

The oilfields affected this time include Bozhong ("BZ") 28-2 S, BZ 28-2 SN, BZ 34-1N and BZ 29-4. All of these four fields are owned and operated by the Company. The total production capacity was approximately 39,000 barrels per day.

The Company maintains appropriate insurance coverage of the operations related to the oilfields.

Notes to Editors:

More information about the Company is available at http://www.cnoocltd.com.

This press release includes "forward-looking statements" within the meaning of the United States Private Securities Litigation Reform Act of 1995, including statements regarding expected future events, business prospectus or financial results. The words "believe", "intend", "expect", "anticipate", "project", "estimate", "plan", "predict" and similar expressions are intended to identify such forward-looking statements. These statements are based on assumptions and analyses made by us that we believe are reasonable under the circumstances. However, whether actual results and developments will meet our expectations and predictions depend on a number of risks and uncertainties which could cause our actual results, performance and financial condition to differ materially from our expectations. For a description of these and other risks and uncertainties, please see the documents we file from time to time with the United States Securities and Exchange Commission, including our 2009 Annual Report on Form 20-F filed on April 23, 2010.