US Patent Issued to China National Petroleum Corporation;, CNPC Engineering Technology R&D on Dec. 16 for "High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof" (Chinese Inventors)

ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,331, issued on Dec. 16, was assigned to China National Petroleum Corporation; (Beijing) and CNPC Engineering Technology R&D Co. Ltd. (Beijing).

"High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof" was invented by Hua Zhang (Beijing), Jianzhou Jin (Beijing), Yongjin Yu (Beijing), Congfeng Qu (Beijing), Fengzhong Qi (Beijing), Ming Xu (Beijing), Shuoqiong Liu (Beijing), Zhaohui Wang (Beijing), Yuchao Guo (Beijing), Jiliang Liu (Beijing), Bin Lyu (Beijing), Zhiwei Ding (Beijing), Chi Zhang (Beijing), Zishuai Liu (Beijing), Hongfei Ji (Beijing), Xiujian Xia (Beijing), Yong Li (Beijing), Chongfeng Zhou (Beijing...