公告日期：2025-04-17

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

（在中华人民共和国注册成立的股份有限公司）

（Stock Code 股份代号：2883）

16 April 2025
Dear registered shareholder(s),

Reminder letter regarding the Arrangement of Electronic Dissemination of Corporate Communications (Note 1)

With reference to the notification letter dated 28 February 2024 titled “Arrangement of Electronic Dissemination of Corporate Communications”, China Oilfield
Services Limited (the “Company”) is writing to remind you that the Company has adopted electronic dissemination of corporate communications (the “Corporate
Communications”), which mean any documents issued or to be issued by the Company for the information or action of holders of any of its securities, including
but not limited to (a) the directors’ report, its annual accounts together with a copy of the auditors’ report and, where applicable, its summary financial report; (b)
the interim report and, where applicable, its summary interim report; (c) a notice of meeting; (d) a listing document; (e) a circular and (f) a proxy form.

Please note that both the English and Chinese versions of all future Corporate Communications will be available electronically on the website of the Company at
www.cosl.com.cn and the HKEXnews website at www.hkexnews.hk in place of printed copies.

Solicitation of electronic contact details

The Company have not received your email address for the electronic dissemination of Corporate Communications. To ensure timely receipt of the Actionable
Corporate Communications, the Company recommends you provide your email address by scanning your personalized QR code printed on the enclosed reply form
(the“Reply Form”).Alternatively,you ma……
[点击查看PDF原文]

提示：本网不保证其真实性和客观性，一切有关该股的有效信息，以交易所的公告为准，敬请投资者注意风险。