Sinopec Oilfield Service : Form of proxy for the First H Shareholders Class Meeting for 2021

Sinopec Oilfield Service Corporation

(a joint stock limited company established in the People's Republic of China)

(Stock code: 1033)

Form of proxy for the First H Shareholders Class Meeting for 2021

Sinopec Oilfield Service Corporation (the "Company"), HEREBY APPOINT3 the Chairman of the H Shareholders Class

Meeting or

of

as my/our proxy to act for me/us and on my/our behalf at the first H shareholders class meeting for 2021 (the "H Shareholders Class Meeting") of the Company to be held at Beijing Shengli Hotel, No. 3 Beishatan, Deshengmen Wai, Chaoyang District, Beijing, the People's Republic of China (the "PRC") on Friday, 18 June 2021 at 10:15 a.m. and at any adjournment thereof and to vote for me/us and in my/our name(s) in respect of such resolution as indicated below, and, if no such indication is given, as my/our proxy thinks fit.

1. To consider and approve the authorisation to the Board to repurchase domestic shares and/or overseas-listed foreign shares of the Company.

Signature5

Note:

1. Full name(s) and address(es) to be inserted in BLOCK CAPITALS.
2. Please insert the number of shares registered in your name(s). If no number is inserted, this form of proxy will be deemed to relate to all the shares in the capital of the Company registered in your name(s).
3. If any proxy other than the Chairman of the H Shareholders Class Meeting is preferred, strike out the words "the Chairman of the H Shareholders Class Meeting or" and insert the name and address of the proxy desired in the space provided. Any shareholder may appoint one or more proxies to attend and vote on its behalf. A proxy need not be a shareholder of the Company.
4. Important: if you wish to vote for any of the resolutions, tick in the appropriate box marked "For". If you wish to vote against any of the resolutions, tick in the appropriate box marked "Against". Failure to tick a box will entitle your proxy to cast your vote at his discretion. Pursuant to the Articles of Association of the Company, the shares "withheld" or "abstained" from voting will not be counted in the calculation of the required majority.
5. This form of proxy must be signed by you or your attorney duly authorised in writing or, in the case of a body corporate, either under seal or under the hand of the director or attorney duly authorised in writing.
6. To be valid, the original power of attorney or other authorisation document(s) which has been notarised together with the completed form of proxy must be returned to the Company's business address or the Hong Kong Registrars Limited (the address is 17M Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong) not less than 24 hours before the designated time for holding the H Shareholders Class Meeting (i.e. before 10:15 a.m. on 17 June 2021, Hong Kong time).
7. Any alteration made to this form of proxy must be initiated by the person who signs it.
8. Any proxy who attends the H Shareholders Class Meeting on behalf of a shareholder shall present his identification document and the form of proxy signed by the appointing shareholder or the legal representative of the appointing shareholder. The form of proxy shall specify the date of issue.
9. This form of proxy should be read together with the circular dated 27 April 2021 published by the Company in relation to the annual general meeting for 2020.