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Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this notice, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this notice.



(Incorporated in the People's Republic of China as a joint stock limited liability company)

(Stock Code: 2883) SUPPLEMENTAL NOTICE OF ANNUAL GENERAL MEETING

Reference is made to the notice (the "Initial Notice") of annual general meeting ("AGM") dated

17 April 2015, by which the AGM of China Oilfield Services Limited (the "Company") will be held at Room 504, CNOOC Plaza, 25 Chaoyangmen North Avenue, Dongcheng District, Beijing, the PRC, at 10.00 a.m. on Tuesday, 2 June 2015. This supplemental notice shall be read together with the Initial Notice.

THIS SUPPLEMENTAL NOTICE IS HEREBY GIVEN that the following proposed resolution will be considered and, if thought fit, approved by shareholders of the Company at the AGM as ordinary resolutions, in addition to the proposed resolutions set out in the Initial Notice:

(1) To re-elect Mr. Li Yong as an executive director of the Company with immediate effect.

(2) To re-elect Mr. Liu Jian as a non-executive director of the Company with immediate effect.

By Order of the Board of

China Oilfield Services Limited Yang Haijiang

Company Secretary

21 May 2015

Notes:

Second Proxy Form

1. A member entitled to attend and vote at the AGM is entitled to appoint one or more proxies (whether they are members of the Company or not) to attend and vote on his/ her/its behalf at the meeting(s).
2. The instrument appointing a proxy must be in writing signed by the appointer or his attorney duly authorised in writing.
For appointer who is a legal person, the instrument appointing proxy should be signed under its seal or signed by its director or an attorney duly authorised in writing. For the instrument appointing proxy signed by an authorised person,

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the power of attorney or other documents of authorization must be notarised. To be valid, the notarised power of attorney or other documents of authorisation and the proxy form must be delivered to the Office of the Board of the Company not less than 24 hours before the time appointed for holding of the AGM.
3. Since the proxy form (the "First Proxy Form") sent together with the Initial Notice does not contain the proposed resolutions for the re-election of Directors set out in this supplemental notice, a new proxy form (the "Second Proxy Form") has been prepared and is sent together with the Company's circular of which this supplemental notice of AGM forms part.
4. Shareholders are requested to complete and return the Second Proxy Form in accordance with the instructions printed thereon to the registrar of H Shares of the Company, Computershare Hong Kong Investor Services Limited at 17M Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong not less than 24 hours before the time appointed for the holding of the relevant meeting or any adjournment thereof (as the case may be).
5. A shareholder who has not yet lodged the First Proxy Form with the Company is requested to lodge the Second Proxy Form if he/she wishes to appoint proxies to attend the AGM on his/her behalf. In this case, the First Proxy Form should not be lodged with the Company.
6. A shareholder who has already lodged the First Proxy Form with the Company should note that:
(i) if no Second Proxy Form is lodged with the Company, the First Proxy Form will be treated as a valid proxy form lodged by him/her if correctly completed. The proxy so appointed by the shareholder will be entitled to vote at his/ her discretion or to abstain from voting on any resolution properly put to the AGM, including the resolution for, among other matters, the proposed re-election of Directors of the Company, as set out in this supplemental notice of AGM.
(ii) if the Second Proxy Form is lodged with the Company 24 hours prior to the time appointed for holding the AGM (the "Closing Time"), the Second Proxy Form will revoke and supersede the First Proxy Form previously lodged by him/her. The Second Proxy Form will be treated as a valid proxy form lodged by the shareholder if correctly completed.
(iii) if the Second Proxy Form is lodged with the Company after the Closing Time, the Second Proxy Form will be invalid. However, it will revoke the First Proxy Form previously lodged by the shareholder, and any vote that may be cast by the purported proxy (whether appointed under the First Proxy Form or the Second Proxy Form) will not be counted in any poll which will be taken on a proposed resolution. Accordingly, shareholders are advised not to lodge the Second Proxy Form after the Closing Time. In such case, if such Shareholders wish to vote at the AGM, they will have to attend in person and vote at the AGM themselves.
7. Shareholders are reminded that completion and delivery of the First Proxy Form and/or the Second Proxy Form will not preclude shareholders from attending and voting in person at the AGM or at any adjourned meeting should they so wish.

General

8. Shareholders should refer to other notes in the Initial Notice in relation to the AGM.

As at the date hereof, the executive directors of the Company are Messrs. Li Yong and Li Feilong, the non-executive directors of the Company are Messrs. Liu Jian (Chairman) and Zeng Quan and the independent non-executive directors of the Company are Messrs. Tsui Yiu Wa, Fong Wo, Felix and Law Hong Ping, Lawrence.

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