6-K

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGNISSUER

Pursuant to Rule 13a-16 or 15d-16 of

the Securities ExchangeAct of 1934

For the month ofAugust 2023

Commission FileNumber: 001-15006

PETROCHINA COMPANYLIMITED

9 Dongzhimen NorthStreet, Dongcheng District

Beijing, The People’sRepublic of China, 100007

(Address of Principal ExecutiveOffices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F   ☒            Form 40-F  ☐

EXHIBITS

FORWARD-LOOKING STATEMENTS

This announcement contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect our current views with respect to future events and are not a guarantee of future performance. Actual results may differ materially from information contained in these forward-looking statements as a result of a number of factors.

We do not intend to update or otherwise revise the forward-looking statements in this announcement, whether as a result of new information, future events or otherwise. Because of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this announcement might not occur in the way we expect, or at all.

You should not place undue reliance on any of these forward-looking statements.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this announcement to be signed on its behalf by the undersigned, thereunto duly authorized.

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

中國石油天然氣股份有限公司

PETROCHINA COMPANY LIMITED

(a joint stock limited company incorporatedin the People’s Republic of China with limited liability)

(Stock Code: 857)

VOLUNTARY ANNOUNCEMENT

THE PROPOSED INTERIM DIVIDEND OF THE COMPANY

This announcement is made by PetroChina Company Limited (the “Company”) on a voluntary basis to inform its shareholders and potential investors of the proposed interim dividend of the Company.

According to the articles of association of the Company: “Dividend shall be paid twice a year. The annual dividends of the Company shall be decided by the shareholders by way of an ordinary resolution. The shareholders may by way of an ordinary resolution authorize the board of directors to decide on the interim dividends.” The resolution regarding the authorization to the board of directors of the Company (the “Board”) to determine the 2023 interim profit distribution scheme of the Company has been considered and approved in the annual general meeting of the Company for the year 2022. The Company proposes to declare an interim dividend and to submit such resolution at the Board meeting which will be convened in the last ten-day period of August 2023. The Company will fulfill relevant information disclosure obligations in a timely manner.

As the 2023 interim profit distribution scheme of the Company shall be considered and approved by the Board, investors are advised to exercise caution when dealing in the securities of the Company.

Beijing, the PRC

10 August 2023

As at the date of this announcement, the Boardcomprises Mr. Dai Houliang as Chairman; Mr. Hou Qijun as Vice Chairman and non-executive Director; Mr. Duan Liangwei and Mr. Xie Jun asnon-executive Directors; Mr. Huang Yongzhang and Mr. Ren Lixin as executive Directors; and Mr. Cai Jinyong, Mr. Jiang, Simon X., Mr. ZhangLaibin, Ms. Hung Lo Shan Lusan and Mr. Ho Kevin King Lun as independent non-executive Directors.