Sou Hu Cai Jing·2025-06-28 22:21Group 1 - The State Intellectual Property Office of China granted a patent for a "Petroleum Drilling Fluid Additive Stirring Device" to China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. and China National Petroleum Corporation [1] - The patent aims to address the technical issue of liquid accumulation and residue affecting the quality of subsequent products in the stirring equipment used for petroleum drilling fluids [1] - The device includes a stirring box and stirring mechanism, which consists of a transmission rod, first and second cleaning brushes, and a rotating driver, designed to clean the bottom and side walls of the stirring box [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 3,227 patent records, along with 10 trademark records and 75 administrative licenses [2] - China National Petroleum Corporation, founded in 1990 and based in Beijing, has a registered capital of 48,690,000,000 RMB, with investments in 113 companies and 5,000 patent records [2]