Jin Rong Jie·2025-06-12 02:20Group 1 - China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. applied for a patent titled "A Rust Removal Device and Process for the Inner Wall of Oil Pipes Using Continuous Oil Pipes" [1] - The patent aims to address the issue of rust removal on oil pipes, which currently can only be done on the ground [1] - The device includes a continuous scraping module with specific components designed to facilitate the rust removal process [1] Group 2 - China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. was established in 2008, located in Tianjin, with a registered capital of 1,621,400,000 RMB [2] - The company has participated in 5,000 bidding projects and holds 3,169 patents [2] - China National Petroleum Corporation, established in 1990 and based in Beijing, has a registered capital of 48,690,000,000 RMB and has invested in 103 companies [2]