Group 1 - The State Intellectual Property Office of China has granted a patent for an "Online Calibration Device for Drilling Fluid Instruments" to Sinopec Petroleum Engineering Technology Service Co., Ltd., Sinopec Shengli Petroleum Engineering Co., Ltd., and Shandong Shenggong Testing Technology Co., Ltd. The patent was applied for on October 2021 [1] - Sinopec Petroleum Engineering Technology Service Co., Ltd. was established in 2012, located in Beijing, with a registered capital of 4 billion RMB. The company has participated in 31 bidding projects and holds 5,000 patent records [1] - Sinopec Shengli Petroleum Engineering Co., Ltd. was also established in 2012, located in Dongying, with a registered capital of 700 million RMB. The company has participated in 5,000 bidding projects and holds 2,741 patent records [1] Group 2 - Shandong Shenggong Testing Technology Co., Ltd. was established in 2014, located in Dongying, with a registered capital of 50 million RMB. The company has participated in 51 bidding projects and holds 37 patent records [2]