CNOOC Limited Announces Key Operational Statistics for Q1 2019

HONG KONG,April 25,2019 -- CNOOC Limited (the "Company",SEHK: 00883,NYSE: CEO,TSX: CNU) today announced its key operational statistics for the first quarter of 2019.

The Company achieved a total net production of 120.1 million barrels of oil equivalent ("BOE") for the first quarter of 2019,remaining stable compared to the same period last year. Production from offshore China increased 2.3% year over year ("YoY") to 79.3 million BOE,mainly attributable to commencement of production of new projects. Overseas production decreased 4.2% YoY to 40.8 million BOE,mainly due to completion of historical investment recovery of Missan project in Iraq and expiration of contract of SES block in Indonesia.

During the period,the Company made four new discoveries and drilled ten successful appraisal wells. In Bohai,the new discovery Luda 25-1 is expected to be a mid-sized oil-bearing structure. In Guyana,two new discoveries,namely Tilapia and Haimara,were made in the Stabroek block,which represent the eleventh and twelfth oil discoveries achieved in the block. In addition,on April 18,the operator,ExxonMobil has announced Yellowtail as the thirteenth discovery in the block.

For the new projects planned to commence production this year,Egina oilfield in Nigeria and Huizhou 32-5 oilfield comprehensive adjustment/Huizhou 33-1 oilfield joint development project in offshore China have commenced production successfully,other projects progressed smoothly.

The unaudited oil and gas sales revenue of the Company reached approximately RMB 42.05 billion for the first quarter of 2019,down 1.1% YoY. During the period,the Company's average realized oil price decreased 4.3% YoY to US$60.78 per barrel,which is in line with the international oil prices. The Company's average realized gas price was US$6.88 per thousand cubic feet,increasing by 6.3% YoY,primarily driven by the increased production proportion from gas fields of higher realized gas price.

For the first quarter of 2019,the Company's capital expenditure reached approximately RMB 14.08 billion,up 45.8% YoY as a result of increased workload.

Mr. Yuan Guangyu,CEO of the Company,said,"In the first quarter of the year,the Company's overall production and operations remained stable,capital expenditure increased substantially. Looking ahead,we will steadily increase oil and gas reserve and production,continuously adhere to the concept of green and low-carbon and promote the high-quality development of the Company,strive to achieve the overall target for the year."

Notes to Editors:

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

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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.

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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: mr@cnooc.com.cn

Ms. Ada Leung

Hill+Knowlton Strategies Asia

Tel: +852 2894 6225

Fax: +852 2576 1990

E-mail: CNOOC@hkstrategies.com

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