Simulation and Experimental Research of PDC Bit Cutting Rock

Abstract

In order to achieve efficiently the optimal design and evaluation of PDC (polycrystalline diamond compact) bit, a finite element model for PDC bit cutting rock was established, forecasting the torque and the drilling pressure distribution trends of the cutting teeth on the bit. Through the PDC bit drilling rock, our experimental model validates the reasonableness and effectiveness of finite element simulation. It further demonstrates that the results of the changing trend of experiment and finite element simulation are very close and verify the accuracy and feasibility of the simulation model. The finite element model for single wing PDC cutting rock was established. This paper analyzes the distribution trends of the cutter torque and drilling pressure on bit under the conditions of the different penetration rates and rotational speeds. The “attack” of the cutting teeth is also analyzed. The results show that the torque of the cutting teeth is increased with the increasing penetration rate with the other conditions being the same. Under the same penetration rate and rotating speed, the drilling pressure of the cutting teeth tends to increase first with the increasing distance from the center axis of the drill bit, and then decrease. The cutting force of each tooth increases with the increasing penetration rate, and near the shoulder, it reaches the maximum, even though the cutting force is less affected by the rotating speed.