Group 1 - China National Petroleum Corporation (CNPC) and China Petroleum Group Chuanqing Drilling Engineering Company have obtained a patent for a "centimeter-level high solid phase plugging slurry mixed transportation plugging device" [1] - The patent includes a mixing system, storage tank, electric control cabinet, and pump system, all connected for efficient operation [1] - The device features a cone-shaped bottom for the storage tank, achieving over 96% utilization of plugging slurry with minimal residue [1] Group 2 - CNPC was established in 1990, located in Beijing, with a registered capital of 48.69 billion RMB and has invested in 106 companies [2] - China Petroleum Group Chuanqing Drilling Engineering Company was founded in 2008, located in Chengdu, with a registered capital of 1.16 billion RMB and has invested in 12 companies [2] - CNPC has participated in 5,000 bidding projects and holds 5,000 patent records, while Chuanqing Drilling has participated in 3,267 bidding projects and holds 4,008 patent records [2]