Tools and Machinery
| Sat 18 Jul 2026
Beijing, July 18 -- CNPC Greatwall Drilling and China National Petroleum have submitted a patent application for Coring Drill Bit and Coring Drilling Equipment. Zhang Zengqiang, Su Yang, Wang Haodi, Xie Mengyu, Guo Haiquan, Dong Chenchen, Sun Shaoliang, Wang Kewei, Shi Lin, Liu Haohong, Xu Weishou, Ping Shanhai, Xu Tao, Dang Yuf..