Exhibit 23.5
[LETTERHEAD OF GAFFNEY, CLINE & ASSOCIATES (CONSULTANTS) PTE LTD.]
YDH/dh/PS-13-2127&PS-13-2128/2014/L0090b
27th March, 2014
CNOOC Limited
No. 25, Chaoyangmenbei Dajie
Dongcheng District
Beijing 100010, P.R. China
Dear Sir,
Consent of Gaffney, Cline & Associates (Consultants) Pte Ltd.
We consent to the reference to our firm under the caption “Experts” in this Post-Effective Amendment No. 1 to the Registration Statement on Form F-3 (File No. 333-188261) and related Prospectus Supplements of CNOOC Limited for the registration of debt securities and guarantees and to the incorporation by reference therein of our reports included in its Annual Report on Form 20-F for the year ended December 31, 2013, filed with the Securities and Exchange Commission.
| Yours sincerely, | ||||
| Gaffney, Cline & Associates (Consultants) Pte Ltd. | ||||
/s/ Stephen A. Sakowski | ||||
| Stephen A. Sakowski | ||||
| Technical Director | ||||
[Signature page to F-3 Consent - GCA]
