Sou Hu Cai Jing·2026-01-20 04:05Group 1 - The State Intellectual Property Office of China shows that China National Petroleum Corporation Bohai Petroleum Equipment Manufacturing Co., Ltd., China National Petroleum Corporation, and Bohai Petroleum Equipment (Tianjin) Zhongcheng Machinery Manufacturing Co., Ltd. have applied for a patent titled "A Constant Pressure Drop Nozzle," with publication number CN121345439A, and application date of August 2025. The invention relates to drilling equipment technology, specifically a constant pressure drop nozzle designed to address issues in existing technologies where fixed specifications and non-adjustable outlet flow areas lead to discrepancies between actual and calculated flow rates, affecting downhole safety and drilling efficiency [1] - The constant pressure drop nozzle features elastic components and two sliding blocks that balance the elastic force and the reaction force from the drilling fluid, allowing for automatic adjustment of the effective cross-section of the spray channel to maintain a constant pressure drop [1] Group 2 - China National Petroleum Corporation Bohai Petroleum Equipment Manufacturing Co., Ltd. was established in 2008, located in Tianjin, primarily engaged in specialized equipment manufacturing. The company has a registered capital of 619,773.124226 million RMB and has invested in 28 enterprises, participated in 2,770 bidding projects, and holds 1,491 patents [2] - China National Petroleum Corporation, founded in 1990 and based in Beijing, focuses on oil and gas extraction. It has a registered capital of 48,690,000 million RMB, invested in 107 enterprises, participated in 5,000 bidding projects, and holds 5,000 patents [2] - Bohai Petroleum Equipment (Tianjin) Zhongcheng Machinery Manufacturing Co., Ltd. was established in 1996, also located in Tianjin, primarily engaged in general equipment manufacturing. The company has a registered capital of 20,847.42 million RMB, invested in 2 enterprises, participated in 1,939 bidding projects, and holds 163 patents [3]