Oil & Gas
| Fri 30 Jan 2026
Beijing, Jan. 30 -- PetroChina has sought patent for Wellhead Sealing Device and Method. This invention was developed by Liu Yazhou, Wei Kai, Li Teng, Zhao Shujie, Liu Peiheng, Pang Ming, Du Xiaoxue, Li Yiyuan, Zhang Hengjia, Zhao Chao, Li Yang, Wang Wei, Li Hongjun, Ren Guoheng, Liu Fushun and Geng Haonan.
The patent applicati..