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<p>At present, global oil and gas exploration is gradually turning to deep unconventional reservoir development. Special-shaped cutters are widely used in complex formations with their excellent performance, but their rock breaking mechanism needs further study. Based on the finite element model of heterogeneous granite embedded with Voronoi, the differences of geometrical parameters, stress distribution and rock-breaking efficiency of cylindrical PDC cutters, Cusp-shaped PDC cutters and Axe-shaped PDC cutters at different cutting angles and cutting depths are discussed. Results show that increasing the cutting angle of PDC cutters inhibits brittle rock fracture, enhances the deterioration of the influenced area, and that brittle fracture in the forced rock removal zone is closely associated with cutting depth. Axe-shaped PDC cutter has better rock-breaking efficiency, and the optimal attack angle is 110°. The drilling experiment of PDC bit shows that increasing WOB can effectively improve the rock-breaking efficiency. Axe-shaped PDC bit has a significant ROP enhancement effect at high WOB, and Cusp-shaped PDC bit is not suitable for hard formations. This paper provides a reference for the optimization of PDC cutter layout in deep complex formations. </p>

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Rock cutting and ROP improving mechanism of specially-shaped PDC cutter in hard brittle granite

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Weiji Liu,
  • Zhihang Liu,
  • Rui Li,
  • Xiaohua Zhu

摘要

At present, global oil and gas exploration is gradually turning to deep unconventional reservoir development. Special-shaped cutters are widely used in complex formations with their excellent performance, but their rock breaking mechanism needs further study. Based on the finite element model of heterogeneous granite embedded with Voronoi, the differences of geometrical parameters, stress distribution and rock-breaking efficiency of cylindrical PDC cutters, Cusp-shaped PDC cutters and Axe-shaped PDC cutters at different cutting angles and cutting depths are discussed. Results show that increasing the cutting angle of PDC cutters inhibits brittle rock fracture, enhances the deterioration of the influenced area, and that brittle fracture in the forced rock removal zone is closely associated with cutting depth. Axe-shaped PDC cutter has better rock-breaking efficiency, and the optimal attack angle is 110°. The drilling experiment of PDC bit shows that increasing WOB can effectively improve the rock-breaking efficiency. Axe-shaped PDC bit has a significant ROP enhancement effect at high WOB, and Cusp-shaped PDC bit is not suitable for hard formations. This paper provides a reference for the optimization of PDC cutter layout in deep complex formations.