PETROCHINA(SH:601857) Sou Hu Cai Jing·2025-11-29 11:00Group 1 - The State Intellectual Property Office of China granted a patent to Daqing Oilfield Co., Ltd. and China National Petroleum Corporation for a method of establishing a velocity field that matches well seismic layers step by step, with the patent announcement number CN119065024B and application date of June 2023 [1] Group 2 - Daqing Oilfield Co., Ltd. was established in 2000, located in Daqing City, primarily engaged in oil and gas extraction, with a registered capital of 4,750 million RMB [1] - Daqing Oilfield Co., Ltd. has invested in 35 companies, participated in 5,000 bidding projects, holds 12 trademark records, 4,686 patent records, and possesses 7,344 administrative licenses [1] Group 3 - China National Petroleum Corporation was established in 1999, located in Beijing, primarily engaged in oil and gas extraction, with a registered capital of 18,302.097 million RMB [1] - China National Petroleum Corporation has invested in 1,293 companies, participated in 443 bidding projects, holds 38 trademark records, 5,000 patent records, and possesses 168 administrative licenses [1]