新型PDC钻头切削齿破岩仿真实验研究

doi:10. 11799/ ce202504030

Abstract

Abstract:

PDC (polycrystalline diamond composite) drill bit is one of the most widely used tools in mechanical rock breaking. In order to investigate the influence of different working parameters on the rock breaking rate in the simulation process of PDC drill bit cutting rock formation, a discrete element simulation of a single cutting tooth of a new type of PDC drill bit was established based on the EDEM (Discrete Element Method, DEM) software, which simulated the dynamic process of a single cutting tooth cutting rock wall, and analysed the rock breaking condition of the cutting tooth at different angles of itself, the angle of cutting into the wall, the rotation speed of the drill bit, the traction speed, and other key factors, and the rock breaking rate of the factors was obtained by the number of the destruction of the bonding bonds. The results showed that: The angle of the cutting tooth and the traction speed are the main factors affecting the rock breaking rate, the angle of cutting into the rock wall and the rotation speed of the drill bit are the secondary factors affecting the rock breaking rate. The highest rock breaking rate was achieved when the angle of the cutting teeth was 70°, the angle of cutting into the rock wall was 30°, the rotation speed of the drill bit was 31.4 rad/s, and the traction speed was 0.25 m/s. Under the same conditions, the rock breaking rate of cylindrical cutting teeth is 57.66%, and the rock breaking rate of circular platform cutting teeth is 56.36%, but the wear of circular platform cutting teeth is 29.72% lower than that of cylindrical cutting teeth, which effectively improves the service life of the tool, and has better rock-breaking performance. These findings can serve as a foundation for designing and selecting construction parameters of PDC drill bit when simulating the working process of cutting teeth for rock breaking by EDEM.

CLC Number:

TD421

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Simulation on rock breaking of a new cutting teeth for PDC drill bit

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