Oil & Gas
| Fri 03 Apr 2026
Beijing, April 3 -- Daqing Oilfield and PetroChina have submitted a patent application for External Broken Rod Blowout Preventer Device for Wellhead of Oil Pumping Unit. Tang Kai, Yang Haibo, He Chenggang, Zhang Chunchao, Chai Guobao, Liu Yu, Gao Jinxiu, Yue Dongwei, Lyu Yang, Li Zhibo, Niu Wenjuan and Zhao Haonan developed the ..