Group 1 - China National Petroleum Pipeline Engineering Co., Ltd. applied for a patent titled "A Design Method and Structure for Mitigating Frost Heave Deformation of Pipelines in Frozen Soil Areas" with publication number CN119962125A, filed on November 2023 [1] - The patent aims to provide a method to mitigate frost heave deformation of oil and gas pipelines by creating a complete thermal insulation layer between the pipeline and the trench bottom, using isolation backfill and insulation materials [1] - The company was established in 1995, located in Langfang, with a registered capital of 60 million RMB, and has participated in 1,751 bidding projects [1] Group 2 - China National Petroleum Corporation (CNPC) was founded in 1990, located in Beijing, with a registered capital of 48,690 million RMB, and has invested in 107 companies [2] - CNPC has participated in 5,000 bidding projects and holds 5,000 patents, along with 1,443 trademark registrations [2] - China Petroleum Pipeline Bureau Engineering Co., Ltd. was established in 2000, located in Langfang, with a registered capital of 500,670.44 million RMB, and has invested in 33 companies [2] - The company has also participated in 5,000 bidding projects and holds 1,292 patents, along with 13 trademark registrations [2]