US Patent Issued to CHINA PETROLEUM & CHEMICAL, SINOPEC SOUTHWEST OIL & GAS on Dec. 2 for "Wellbore staged operation method and rubber plug for said method" (Chinese Inventors)

ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,753, issued on Dec. 2, was assigned to CHINA PETROLEUM & CHEMICAL Corp. (Beijing) and SINOPEC SOUTHWEST OIL & GAS COMPANY (Sichuan, China).

"Wellbore staged operation method and rubber plug for said method" was invented by Wei Lei (Sichuan, China), Zhimin Hou (Sichuan, China), Haifeng Dong (Sichuan, China), Yancheng Yan (Sichuan, China), Lin Lan (Sichuan, China), Xingwen Wang (Sichuan, China), Xiaogang Wang (Sichuan, China), Zhiguo Qiao (Sichuan, China) and Zhou Fang (Sichuan, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A wellbore staged operation method includes running, after a first well drifting operation is performed on a wellbore, a pi...