Ticker: CEO, Company: CNOOC LTD, Type: 20-F, Date: 2019-04-23, XBRL Interactive Financials
Original SEC Filing: Click here

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Webplus: CEO/20190423/20-F_1/1/000.htm SEC Original: dp105023_20f.htm
Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report. Shares 44,647,455,984 ý ¨ Yes ¨ ý Yes ý ¨ Yes ý ¨ Yes ý Large accelerated filer Accelerated filer ☐ Non-accelerated filer ☐ Emerging growth company ☐

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Webplus: CEO/20190423/20-F_1/2_EX-8.1/000.htm SEC Original: dp105023_ex0801.htm
Subsidiaries As of December 31, 2018, we owned, directly or indirectly, the following subsidiaries. Name of entity Our interest Jurisdiction of incorporation CNOOC China Limited 100% Tianjin, PRC CNOOC International Limited 100% British Virgin Islands China Offshore Oil (Singapore) International Pte Ltd 100% Singapore CNOOC Finance (2003) Limited 100% British Virgin Islands Malacca Petroleum Limited 100% Bermuda CNOOC Energy U.S.A.

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Webplus: CEO/20190423/20-F_1/3_EX-11.1/000.htm SEC Original: dp105023_ex1101.htm
CNOOC Limited (incorporated under the laws of Hong Kong with limited liability) Code of Ethics for Directors and Senior Officers 23 August 2018 I. INTRODUCTION This “CNOOC Limited Code of Ethics for Directors and Senior Officers” (the “Code of Ethics”) summarizes the major long-standing principles of conduct that our company, 1 II. COMPLIANCE WITH LAWS, RULES AND REGULATIONS III. PROHIBITION

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Webplus: CEO/20190423/20-F_1/4_EX-12.1/000.htm SEC Original: dp105023_ex1201.htm
CERTIFICATIONS I, Guangyu Yuan, certify that: 1. I have reviewed this annual report on Form 20-F of CNOOC Limited; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made,

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Webplus: CEO/20190423/20-F_1/5_EX-12.2/000.htm SEC Original: dp105023_ex1202.htm
CERTIFICATIONS I, Weizhi Xie, certify that: 1. I have reviewed this annual report on Form 20-F of CNOOC Limited; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made,

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Webplus: CEO/20190423/20-F_1/6_EX-13.1/000.htm SEC Original: dp105023_ex1301.htm
CERTIFICATIONS Guangyu Yuan, the Chief Executive Officer and Weizhi Xie, the Chief Financial Officer of CNOOC Limited, each certifies that, to the best of his knowledge: 1. the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and 2. the information contained in the Report fairly presents, in all material respects, the financial condition

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Webplus: CEO/20190423/20-F_1/7_EX-15.1/000.htm SEC Original: dp105023_ex1501.htm
CNOOC LIMITED Estimated Future Reserves and Income Attributable to Certain Leasehold Interests and Derived Through Certain Production Sharing Contracts SEC Parameters As of December 31, 2018 Eric T. Nelson, P.E. HE Zhang, P.E. Ph.D TBPE License No. 102286 TBPE License No. 118807 Managing Senior Vice President Senior Petroleum Engineer [SEAL] [SEAL] RYDER SCOTT COMPANY, L.P. TBPE Firm Registration No. F-1580

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Webplus: CEO/20190423/20-F_1/8_EX-15.2/000.htm SEC Original: dp105023_ex1502.htm
CNOOC LIMITED Estimated Future Reserves and Income CNOOC’s 25% Ownership of Pan American Energy SL SEC Parameters As of December 31, 2018 Eric T. Nelson, P.E. Anna M. Hardesty, P.E. TBPE License No. 102286 TBPE License No.65320 Managing Senior Vice President Senior Vice President [SEAL] [SEAL] RYDER SCOTT COMPANY, L.P. TBPE Firm Registration No. F-1580 RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

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Webplus: CEO/20190423/20-F_1/9_EX-15.3/000.htm SEC Original: dp105023_ex1503.htm
TBPE REGISTERED ENGINEERING FIRM F-1580 FAX (713) 651-0849 1100 LOUISIANA SUITE 4600 HOUSTON, TEXAS 77002-5294 TELEPHONE (713) 651-9191 January 21, 2019 CNOOC Limited c/o Suite 2300, 500 Centre St. S. Calgary, Alberta T2G 1A6 Canada Gentlemen: The properties reviewed by Ryder Scott account for a portion of CEU’s total net proved reserves as of December 31, 2018. Based on the

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Webplus: CEO/20190423/20-F_1/10_EX-15.4/000.htm SEC Original: dp105023_ex1504.htm
Independent Letter The Greater Angostura Fields Prepared for CNOOC Limited as of 31 December 2018 March 2019 This summary letter is based on Gaffney, Cline & Associates’ official report and has been provided at the request of CNOOC Limited. www.gaffney-cline.com Gaffney, Cline & Associates (Consultants) Pte. Ltd. 80 Anson Road #31-01C Fuji Xerox Towers Singapore 079907 Telephone: +65 6225 6951

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Webplus: CEO/20190423/20-F_1/11_EX-15.5/000.htm SEC Original: dp105023_ex1505.htm
Independent Letter The Missan Oil Fields In Eastern Iraq Prepared for CNOOC Limited as of 31 December 2018 March 2019 This summary letter is based on Gaffney, Cline & Associates’ official report and has been provided at the request of CNOOC Limited. www.gaffney-cline.com Gaffney, Cline & Associates (Consultants) Pte. Ltd. 80 Anson Road #31-01C Fuji Xerox Towers Singapore 079907 Telephone:

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Webplus: CEO/20190423/20-F_1/12_EX-15.6/000.htm SEC Original: dp105023_ex1506.htm
HYDROCARBON LIQUIDS & NATURAL GAS RESERVES AUDIT REPORT January 31, 2019 CNOOC Limited No. 25, Chaoyangmenbei Dajie Dongcheng District Beijing 100010, P.R. China Gentlemen: Our third party revision, completed on January 31, 2019 and presented herein, was prepared for public disclosure by CNOOC Limited in filings made with the SEC in accordance with the disclosure requirements set forth in the

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Webplus: CEO/20190423/20-F_1/13_EX-15.7/000.htm SEC Original: dp105023_ex1507.htm
DeGolyer and MacNaughton This is a digital representation of a DeGolyer and MacNaughton report. This file is intended to be a manifestation of certain data in the subject report and as such are subject to the same conditions thereof. The information and data contained in this file may be subject to misinterpretation; therefore, the signed and bound copy of this

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Webplus: CEO/20190423/20-F_1/14_EX-15.8/000.htm SEC Original: dp105023_ex1508.htm
January 24, 2019 CNOOC Limited c/o Suite 2300, 500 Centre Street SE Calgary, Alberta, Canada T2G 1A6 Re: Gentlemen: Reserves included herein are expressed as reserves as represented by CNOOC. Gross reserves are defined as the total estimated petroleum to be produced from these properties after December 31, 2018. Working interest reserves are defined as that portion of the gross

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Webplus: CEO/20190423/20-F_1/15_EX-15.10/000.htm SEC Original: dp105023_ex1510.htm
TBPE REGISTERED ENGINEERING FIRM F-1580 FAX (713) 651-0849 1100 LOUISIANA SUITE 4600 HOUSTON, TEXAS 77002-5294 TELEPHONE (713) 651-9191 Consent of Independent Consultant RYDER SCOTT COMPANY, L.P. Houston, Texas March 15, 2019 SUITE 800, 350 7TH AVENUE, S.W. CALGARY, ALBERTA T2P 3N9 TEL (403) 262-2799 FAX (403) 262-2790 621 17TH STREET, SUITE 1550 DENVER, COLORADO 80293-1501 TEL (303) 623-9147 FAX (303)

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Webplus: CEO/20190423/20-F_1/16_EX-15.11/000.htm SEC Original: dp105023_ex1511.htm
Gaffney, Cline & Associates (Consultants) Pte. Ltd. 80 Anson Road #31-01C Fuji Xerox Towers Singapore 079907 Telephone: +65 6225 6951 www.gaffney-cline.com 14 March 2019 CNOOC Limited No. 25, Chaoyangmenbei Daijie Dongcheng District Beijing 100010, P.R. China Dear Sirs, Consent of Gaffney, Cline & Associates “Independent Letter –The Missan Oil Fields In Eastern Iraq Estimated Proved Reserves and Financial Data, Based

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Webplus: CEO/20190423/20-F_1/17_EX-15.12/000.htm SEC Original: dp105023_ex1512.htm
RPS Consent of Independent Consultant RPS Andy Krichin Managing Director, Energy North America Houston, Texas th March 11 rpsgroup.com Page 1

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Webplus: CEO/20190423/20-F_1/18_EX-15.13/000.htm SEC Original: dp105023_ex1513.htm
Consent of Independent Consultant McDANIEL & ASSOCIATES CONSULTANTS LTD. McDaniel & Associates Consultants Ltd. 2200, Bow Valley Square 3 255 – 5 Avenue S.W. Calgary, Alberta T2P 3G6 Canada March 15, 2019 2200, Bow Valley Square 3, 255 – 5 Avenue SW, Calgary AB T2P 3G6 Tel: (403) 262-5506 Fax: (403) 233-2744 www.mcdan.com

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Webplus: CEO/20190423/20-F_1/19_EX-15.14/000.htm SEC Original: dp105023_ex1514.htm
DeGolyer and MacNaughton 5001 Spring Valley Road Suite 800 East Dallas, Texas 75244 Consent of DeGolyer and MacNaughton Very truly yours, DeGOLYER and MacNAUGHTON Texas Registered Engineering Firm F-716 Dallas, Texas March 15, 2019

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Company Info:

Ticker: CEO, Company: CNOOC LTD, Type: 20-F, Date: 2019-04-23, XBRL Interactive FinancialsCIK: 0001095595, Location: F4, SIC: 1311, SIC Desc: CRUDE PETROLEUM & NATURAL GAS
Business Phone & Address:
65TH FLOOR BANK OF CHINA TOWER, 1 GARDEN RD
HONG KONG