Measurement & Testing
| Wed 26 Aug 2026
Beijing, Aug. 26 -- CNPC Greatwall Drilling and China National Petroleum have received a patent for Totally-closed Liquid-collecting Measuring Top Sheave for Swabbing. This invention was developed by Saishi, Kan Kai, Dong Fangping, Zhuang Yan, Wu Yongxing, Liu Xiutao, Niu Ningsheng, Su Rongbin, Mao Jin, Li Yuanpan, Shen Jianguo ..