Mechanism of Rock Breaking by Convex Non-planar PDC Cutter and Its Applications in Gravel-bearing Formation
A study of convex non-planar PDC cutter was conducted to improve the impact resist-ance of PDC bits in gravel-bearing,soft-hard interlaced,and other inhomogeneous formations.By comparing simulation and laboratory experiments,the mechanism of rock breaking between convex non-planar cutter and conventional planar cutter was investigated.Compared to planar cutter,the con-tact stress generated by cutting rock with convex non-planar cutter is more uniform on the cutter,the load fluctuation during the cutting processes is significantly smaller,and the cutting stability is high-er.The special non-planar structure of the cutter changes the interaction mode between the cutting cutter and the rock,and is successfully applied in heterogeneous formations.
non-planar polycrystalline diamond compact(PDC)gear teeth bitgravel-bearing for-mationmechanism of rock breakingimpact damage
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