The invention belongs to the field of technical equipment used in
oil and natural gas drilling engineering, mine exploiting, geological drilling, constructional
engineering,
tunnel engineering, shielding and non-excavation, and relates to a novel PDC
drill bit utilizing the
impact effect for improving heart
rock breaking efficiency. The PDC
drill bit solves the problems that in the drilling process, a center rock column left in the center part influences drilling efficiency, and the position deviating from the center of a well hole shakes left and right. According to the technical scheme, the upper end of a
turbine is fixed through a nut, the lower end of the
turbine is fixed through a boss on a
turbine shaft, an upper
cam is connected to the turbine shaft through threads, a lower
cam is fixed to a punch hammer through a sunk screw, the upper section of the punch hammer is hollow, a pore passage enabling
drilling fluid to flow out is formed in the upper end of a shell on the lower portion, a pressing head with the top end provided with a tip-shaped PDC tooth is added to the
tail end of a connecting cavity, as a main
impact part, the lower end of the punch hammer becomes thin, and a bi-directional thrust
ball bearing is placed at the lower end. The equipment enables the heart to generate longitudinal
impact, improves the
rock breaking efficiency and reduces drilling cost.