Sou Hu Cai Jing·2025-11-29 02:28Core Insights - China National Petroleum Corporation (CNPC) and China Petroleum Group Chuanqing Drilling Engineering Company have obtained a patent for "Drilling Fluid Filtration Performance Evaluation Device, Testing Method, and Mud Cake Preparation Method" with authorization announcement number CN115290532B, applied for on August 2022 [1] Company Overview - CNPC was established in 1990 and is headquartered in Beijing, primarily engaged in oil and gas extraction. The company has a registered capital of 48.69 billion RMB [1] - CNPC has invested in 111 companies, participated in 5,000 bidding projects, holds 1,446 trademark records, and has 5,000 patent records, along with 28 administrative licenses [1] - China Petroleum Group Chuanqing Drilling Engineering Company was founded in 2008 and is located in Chengdu, focusing on oil and gas extraction. The company has a registered capital of 1.16 billion RMB [1] - Chuanqing Drilling has invested in 12 companies, participated in 3,902 bidding projects, holds 4,273 patent records, and has 32 administrative licenses [1]