中国石油申请估算断层地应力专利，提高断层地应力的估算精度

Group 1 - The core point of the article is that China National Petroleum Corporation (CNPC) has applied for a patent related to a method for estimating fault rock stress, which aims to improve estimation accuracy and reduce costs [1] Group 2 - CNPC was established in 1999 and is primarily engaged in oil and gas extraction, with a registered capital of 18,302,097,000 RMB [2] - The company has invested in 1,298 enterprises and participated in 443 bidding projects, holding 38 trademark records and 5,000 patent records [2] - CNPC also possesses 168 administrative licenses [2]