Tools and Machinery
| Tue 14 Jul 2026
Beijing, July 15 -- CNPC Greatwall Drilling and China National Petroleum have applied Chinese patent for Method and Device for Determining Size of Oil Pipe Leakage Point. Liu Jinfeng, Li Peng, Li Liangliang, Li Fuxing, Wang Tao, Dong Jiafeng, Shi Yaming, Sun Shaoliang, Gao Qingchun, Li Guangqian, Liu Yang, Li Yang, Cao Lei, Jin ..