China Oilfield Services Limited — Proxy Solicitation & Information Statement 2005

Nov 25, 2005

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

Proxy Form for Extraordinary General Meeting

Number of Shares H Shares/ related to this Domestic Shares* proxy form [(note 1)] I(We) [(note 2)] of being the holder(s) of [(note 1)] H Share(s)/ Domestic Share(s)* of China Oilfield Services Limited (“COSL” or the “Company”) now appoint [(note 3)] (I.D. No.: of address: )/

or failing him, the Chairman of the meeting as my(our) proxy to attend and vote for me(us) on the special resolution in accordance with the instructions below and on my(our) behalf at the Extraordinary General Meeting (“EGM”) to be held at 10:00 a.m. on 12 January, 2006 (Thursday) at Room 403, CNOOC Plaza, No.6, Dongzhimenwai Xiaojie, Beijing, the People’s Republic of China (“PRC”) for the purpose of considering and, if thought fit, passing the resolution as set out in the notice convening the said meeting. In the absence of any indication, the proxy may vote for or against the resolution or abstain at his own discretion [ (note 4)] .

By way of Special Resolution: For Against 1. To consider and approve the proposed issue of a short-term debenture in the PRC in an aggregate principal amount not exceeding RMB2,000,000,000.

Date:

Signature: [(note 5)]

Notes:

1. Please insert the number of share(s) registered in your name(s) relating to this form of proxy. If no number is inserted, this form of proxy will be deemed to relate to all of the shares in the capital of the Company registered in your name(s).

2. Please insert full name(s) and address(es) in BLOCK LETTERS .

3. Please insert the name and address of your proxy. If this is left blank, the chairman of the EGM will act as your proxy. One or more proxies, who do not have to be shareholder(s) of the Company, may be appointed to attend and vote in the meeting provided that such proxies must attend the meeting in person on your behalf. Any alteration made to this proxy form must be signed by the signatory.

4. Attention: If you wish to vote FOR any resolution, please indicate with a “ ” in the appropriate space under “For”. If you wish to vote AGAINST any resolution, please indicate with a “ ” in the appropriate space under “Against”. In the absence of any such indication, the proxy will vote or abstain at his discretion.

5. This form of proxy must be signed under hand by you or your attorney duly authorised in writing. If the appointer is a corporation, this form must be signed under its common seal or under hand by any director or agent duly authorised by such corporation. If a person has been authorised to sign this form of proxy on behalf of an individual or corporate shareholder, the power of attorney or other document authorising such person to sign this form of proxy must be notarised and together with this form delivered, in the case of a holder of Domestic Share(s), to the Company at 65/F., Bank of China Tower, 1 Garden Road, Hong Kong, and in the case of a holder of H Share(s), to Computershare Hong Kong Investor Services Limited at 46th Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong, at least 24 hours before the time designated for the holding of the EGM.

* Please delete as appropriate.