Tools and Machinery
| Fri 07 Aug 2026
Beijing, Aug. 7 -- CNPC Greatwall Drilling and China National Petroleum have applied Chinese patent for Salvage Method of Expansion Pipe Patching Tool. Li Hu, Li Peng, Song Rongchao, Chen Dongdong, Yu Meng, Zhu Gaolei, Li Xuefeng, Huo Xin, Wei Xiang, Sun Liwei, Zhang Nan, Yoo Young-kwon, Chen Ye, Guo Ziwei, Feng Xiaoqiang, Huo A..