Axe-shaped PDC cutter is of special shape and presents better breaking performance in rock breaking experiment. However, the rock breaking rules of axe-shaped PDC cutter and the optimization method of its working parameters and shape are ambiguous. Therefore, a three-dimensional finite element model of cutting rock with axe-shaped PDC cutter was established with ABAQUS software, and the effects of back dip angle and axe edge angle on the rock breaking effect of axe-shaped PDC cutter were analyzed by finite element numerical simulation method. The results showed that the rock breaking efficiency of the axe-shaped PDC cutter was the highest when the back dip angle was 15 °; with the same back dip angle, the smaller the axe edge angle was, the easier the tangential crack was to propagate inside the rock, and the optimal axe edge angle was 110 °. According to the simulation results, the shape parameters of the bit with axe-shaped PDC cutter were optimized, and good results were obtained in the field test. The results of the study provide an important basis for the optimal design of the bit with axe-shaped PDC cutter.
Zou Deyong
,
Chen Yahui
,
Zhao Fangyuan
,
Cui Yudong
. Study on Rock Breaking Rules of Axe-shaped PDC Cutter with Numerical Simulation[J]. Special Oil & Gas Reservoirs, 2021
, 28(6)
: 137
-143
.
DOI: 10.3969/j.issn.1006-6535.2021.06.018
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