Group 1 - Daqing Drilling Engineering Co., Ltd. and China National Petroleum Corporation have applied for a patent titled "A Calculation Method for Predicting the Lifespan of the Pack-off Rubber Sleeve," with publication number CN121459962A and application date of July 2024 [1] - The patent involves a method for predicting the lifespan of pack-off rubber sleeves used in oil drilling engineering, which includes collecting baseline data, analyzing it to obtain lifespan characteristics, and establishing a predictive model [1] - The method aims to enhance the accuracy of lifespan predictions for pack-off rubber sleeves by utilizing a trained model based on collected data [1] Group 2 - Daqing Drilling Engineering Co., Ltd. was established in 2024, located in Daqing City, with a registered capital of 916.7 million RMB, and has participated in 811 bidding projects [2] - China National Petroleum Corporation, founded in 1990 and based in Beijing, has a registered capital of 48.69 billion RMB, has invested in 109 companies, and participated in 5,000 bidding projects [2] - Daqing Drilling Engineering Co., Ltd. holds 217 patents and 8 trademark records, while China National Petroleum Corporation has 5,000 patents and 1,438 trademark records [2]