Group 1 - The core point of the article highlights that China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. has obtained a patent for a "tail pipe hanger with sand clearing and anti-sand functions," with the authorization announcement number CN120968472B and an application date of October 2025 [1] - China National Petroleum Corporation Bohai Drilling Engineering Co., Ltd. was established in 2008, located in Tianjin, and primarily engages in oil and gas extraction, with a registered capital of 1,621.4 million RMB [1] - The company has participated in 5,000 bidding projects and holds 3,378 patents, along with 10 trademark registrations and 83 administrative licenses [1] Group 2 - China National Petroleum Corporation, established in 1990 and based in Beijing, also focuses on oil and gas extraction, with a registered capital of 48,690 million RMB [1] - This parent company has invested in 110 enterprises, participated in 5,000 bidding projects, and holds 5,000 patents, along with 1,436 trademark registrations and 28 administrative licenses [1]