Tools and Machinery
| Tue 24 Feb 2026
Beijing, Feb. 25 -- Daqing Drilling Eng Co Ltd and China National Petroleum have applied Chinese patent for Tubular Column Connector Connecting Structure and Top Drive Well Drilling Device. Liu Pengcheng, Qi Yue, Duan Lijun, Zhang Zhenhua, Li Yuhai, Yu Chenglong, Wan Faming, Ma Xiaowei, Bai Xiaojie, Zheng Lu, Zhang Yang, Liang B..