COPC Updates on Bohai Bay Clean Up

HONG KONG, Aug. 12, 2011 /PRNewswire-Asia/ -- CNOOC Limited (the "Company", NYSE: CEO, SEHK: 0883) announced that, according to the latest statement by ConocoPhillips China Inc ("COPC"), the Operator of Penglai 19-3 oil field, more oil-based drilling mud (OBM) on the sea floor was identified. This addition brings the revised volume of OBM on the seabed to 400 cubic meters (2,500 barrels). The volume of oil released to the sea surface remains at 114 cubic meters (717 barrels). The total volume of fluids spilled from the incident amounts to 514 cubic meters (3,217 barrels) of oil and OBM and exceeds 240 cubic meters (1,500 barrels) as originally estimated by the Operator.

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After the incident occurred, COPC has deployed substantial resources for oil recovery and cleanup work. According to COPC, its response personnel has recovered 269 cubic meters (1,700 barrels) of OBM from the seabed near the Penglai 19-3 C platform, and approximately 70 cubic meters (440 barrels) of oil/water mix from the sea surface to date.

As the non-operator, the Company has also fully utilized its resources and personnel to assist COPC on shoreline protection activities with 111 people walking approximately 3,289 kilometers of shoreline and 19 vehicles patrolled approximately 48,645 kilometers of shoreline along the Bohai Bay area by 11 August.

In order to meet the requirements set by the State Oceanic Administration, the Company will continue to urge and assist COPC to stop the leaks and complete the cleanup work by the end of August, so as to minimize the impact of the oil spill incident on the marine environment.

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 of1995, 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 analysis made by the Company in light of its experience and perception of historical trends, current conditions and expected future developments, as well as other factors that the Company believes reasonable under the circumstances. However, whether actual results and developments will meet the Company's expectations and predictions depends on a number of risks and uncertainties which could cause the actual results, performance and financial conditions to differ materially from the Company's expectations, including those associated with fluctuations in crude oil and natural gas prices, the exploration or development activities, the capital expenditure requirements, the business strategy, the highly competitive nature of the oil and natural gas industries, the foreign operations, environmental liabilities and compliance requirements, and economic and political conditions in the People's Republic of China. For a description of these and other risks and uncertainties, please see the documents the Company has filed from time to time with the United States Securities and Exchange Commission, including 2010 Annual Report on Form 20-F filed on April 29, 2011.

Consequently, all of the forward-looking statements made in this press release are qualified by these cautionary statements. The Company cannot assure that the actual results or developments anticipated will be realized or, even if substantially realized, that they will have the expected effect on the Company, its business or operations.

SOURCE CNOOC Limited

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