渤海钻探取得液压自反馈可重复坐封封隔器专利

Group 1 - The State Intellectual Property Office of China has granted a patent to China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. for a "hydraulic self-feedback repeatable packer" with authorization announcement number CN121111173B, applied on November 2025 [1] - China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. was established in 2008 and is based in Tianjin, primarily engaged in oil and gas extraction, with a registered capital of 1,621,400,000 RMB [1] - The company has made investments in one enterprise, participated in 5,000 bidding projects, holds 10 trademark registrations, and has 3,380 patent registrations, along with 83 administrative licenses [1] Group 2 - China National Petroleum Corporation, established in 1990 and located in Beijing, is also primarily engaged in oil and gas extraction, with a registered capital of 48,690,000,000 RMB [1] - The corporation has invested in 110 enterprises, participated in 5,000 bidding projects, holds 1,427 trademark registrations, and has 5,000 patent registrations, along with 28 administrative licenses [1]