Exhibit 15.8

	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

We consent to the reference to our firm in the form and context in which they appear in this Annual Report on Form 20-F, and the inclusion of our reports herein for CNOOC Limited, filed with the Securities and Exchange Commission.

/s/ RYDER SCOTT COMPANY, L.P.

RYDER SCOTT COMPANY, L.P.

TBPE Firm Registration No. F-1580

 Houston, Texas

 April 6, 2018

SUITE  600,  1015  4TH  STREET, S.W.	CALGARY, ALBERTA T2R 1J4	TEL (403) 262-2799	FAX (403) 262-2790
621  17TH STREET, SUITE 1550	DENVER, COLORADO 80293-1501	TEL (303) 623-9147	FAX (303) 623-4258