LJRB(SH:600853) Sou Hu Cai Jing·2026-02-24 06:58Group 1 - The State Intellectual Property Office of China has granted a patent for an integrated testing method for horizontal well loss and replacement efficiency to Sinopec Petroleum Engineering Technology Service Co., Ltd. and Sinopec East China Petroleum Engineering Co., Ltd. The patent authorization announcement number is CN114575825B, with an application date of March 2022 [1] - Sinopec Petroleum Engineering Technology Service Co., Ltd. was established in 2012 and is based in Beijing, focusing on research and experimental development. The company has a registered capital of 4 billion RMB and has participated in 32 bidding projects, with a total of 2,469 patent information entries [1] - Sinopec East China Petroleum Engineering Co., Ltd. was also established in 2012 and is located in Nanjing, primarily engaged in civil engineering construction. The company has a registered capital of approximately 864.3 million RMB, has participated in 2,493 bidding projects, and holds 287 patent information entries [1] Group 2 - Sinopec Petroleum Engineering Technology Service Co., Ltd. has made one external investment and holds four administrative licenses [1] - Sinopec East China Petroleum Engineering Co., Ltd. has made three external investments and possesses 55 administrative licenses [1]