Group 1 - The State Intellectual Property Office of China has granted a patent for a "continuous rotary sliding drilling method" to China National Petroleum Corporation and China Petroleum Group Chuanqing Drilling Engineering Company [1] - China National Petroleum Corporation, established in 1990, is primarily engaged in oil and gas extraction, with a registered capital of 48.69 billion RMB [1] - The company has invested in 111 enterprises, participated in 5,000 bidding projects, and holds 1,446 trademark records and 5,000 patent records [1] - China Petroleum Group Chuanqing Drilling Engineering Company, founded in 2008, also focuses on oil and gas extraction, with a registered capital of 1.16 billion RMB [1] - This company has invested in 12 enterprises, participated in 3,902 bidding projects, and holds 4,273 patent records [1]