Group 1 - China National Petroleum Corporation (CNPC) and China National Petroleum Group Bohai Drilling Engineering Co., Ltd. applied for a patent titled "A Delayed Expansion Sealing Material and Its Preparation Method and Delayed Expansion Sealing System" [1] - The patent application was filed on November 2023, and it pertains to the technology field of sealing agents used in oil drilling [1] - The delayed expansion sealing material is composed of several raw materials with specific weight ratios, including 100 parts of diene carboxylic acid ester monomer, 10-30 parts of diene carboxylic acid monomer, 5-20 parts of graphite powder, and others [1] Group 2 - CNPC was established in 1990 and is primarily engaged in gas production and supply, with a registered capital of 48.69 billion RMB [1] - The company has invested in 105 enterprises and participated in 5,000 bidding projects, holding 1,446 trademark records and 5,000 patent records [1] - China National Petroleum Group Bohai Drilling Engineering Co., Ltd. was founded in 2008, focusing on oil and gas extraction, with a registered capital of 1.6214 billion RMB [2] - This subsidiary has invested in 1 enterprise and also participated in 5,000 bidding projects, holding 10 trademark records and 3,146 patent records [2]