Oil & Gas
| Wed 22 Jul 2026
Beijing, July 23 -- CNPC Greatwall Drilling and China National Petroleum have sought patent for Fluorescence-free Plugging Anti-collapse Agent, Preparation Method Thereof and Drilling Fluid. This invention was developed by Feng Zongwei, Zhang Xin, Niu Zuojun, Yao Rugang, Gao Peng, Hu Yanan, Li Yan, Yuan Yuan, Fu Yanshan, Park Su..