Middle?deep strata of Bohai oilfield is the focus of further exploration and development, of which Bozhong X is a typical mid?deep oil and gas field. The main reservoir with dense lithology and strong abrasiveness is stored for more than 4 000 m depth, resulting in much more complex situations during the early drilling stage, which seriously restricted the reservoir exploration process. In order to solve the problems of complex pressure, serious tool choke and slow penetration rate in the deep?medium strata, this work figured out TorkBuster and Ninja teeth PDC bit efficiency improvement technology and its corresponding applications, using stratigraphic features of Bozhong X oil and gas field as a research sample. The rock breaking mainly involves combination of crushing and rotary shearing, which is mainly used to improve the drilling speed while ensuring the well quality. The TorkBuster with special Ninja teeth PDC bit in BZ?E well can properly overcome the high hardness and compact of granite gneiss, which can increase the drilling speed and prolong the service life of the bit at the same time. It provides a new method for improving the drilling speed in the deep?medium strata of Bohai oilfield and saving drilling cost.