Abstract
In view of the problems of low rock-breaking efficiency, short service life, etc. of conventional PDC bits, a new type of coupling bionic PDC cutter was designed by taking pangolin scales, mole fingers, shark teeth and scallops as bionic prototypes. Based on the finite element method, elastic-plastic mechanics and other methods, the rock-breaking simulation model of the bionic PDC cutter is established. In the finite element software ABAQUS, the temperature-displacement coupling explicit penetration contact algorithm and explicit dynamics module are used to study the temperature field variation and rock-breaking mode of the bionic PDC cutter in the rotating state, and the simulation results are compared with those of the conventional PDC cutter. The simulation results show that the temperature transfer process of bionic PDC cutter is quite different from that of conventional PDC cutter when breaking rock; Bionic PDC cutter can effectively prevent the generation of bit mud pockets, reduce the accumulation of friction heat, avoid the generation of high temperature thermal failure and prolong the service life; Bionic PDC cutter break rock faster and break rock more thoroughly. The research shows that the bionic PDC bit has good field practicability and can be popularized and applied in the field in the future.
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