News Release

CNOOC Limited Announces Weizhou 6-13 Oilfield Commences Production

HONG KONG, March 20, 2018 /PRNewswire/ -- CNOOC Limited (the "Company", SEHK: 00883, NYSE: CEO, TSX: CNU) announced today that Weizhou 6-13 oilfield has commenced production ahead of schedule.

Weizhou 6-13 oilfield is located in Beibu Gulf in the South China Sea with an average water depth of approximately 35 meters. In addition to fully utilizing the existing facilities of Weizhou 12-1 oilfield, the project has also built one wellhead platform. Currently, there are seven wells in production and the project is expected to reach a peak production of approximately 9,400 barrels of crude oil per day in 2019, exceeding its ODP approximately 3,000 barrels of crude oil per day.

Weizhou 6-13 oilfield is an independent oilfield in which the Company holds 100% interest and acts as the operator.

Mr. Yuan Guangyu, CEO of the Company, said: "Weizhou 6-13 oilfield not only commenced production ahead of schedule, but also exceeded its ODP's estimates in both reserves and production. This is attributable to the Company's efforts in strengthening of its innovation and technology-driven philosophy and reinforcing its quality and efficiency enhancements."

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 "expect", "anticipate", "continue", "estimate", "objective", "ongoing", "may", "will", "project", "should", "believe", "plans", "intends" and similar expressions are intended to identify such forward-looking statements. These statements are based on assumptions and analyses made by the Company in light of its experience and its perception of historical trends, current conditions and expected future developments, as well as other factors the Company believes are appropriate under the circumstances. However, whether actual results and developments will meet the expectations and predictions of the Company depends on a number of risks and uncertainties which could cause the actual results, performance and financial condition to differ materially from the Company's expectations, including but not limited to those associated with fluctuations in crude oil and natural gas prices, the exploration or development activities, the capital expenditure requirements, the business strategy, whether the transactions entered into by the Group can complete on schedule pursuant to their terms and timetable or at all, 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 files from time to time with the United States Securities and Exchange Commission, including the Annual Report on Form 20-F filed in April of the latest fiscal year.

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

For further enquiries, please contact:

Ms. Jing Liu
Manager, Media & Public Relations
CNOOC Limited
Tel: +86-10-8452-3404
Fax: +86-10-8452-1441
E-mail: liujing1@cnooc.com.cn

Ms. Iris Wong
Hill+Knowlton Strategies Asia
Tel: +852-2894-6263
Fax: +852-2576-1990
E-mail: cnooc@hkstrategies.com

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SOURCE CNOOC Limited