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<p>As a “hard bone” in the drilling process, high-abrasive tight formation causes serious wear to conventional polycrystalline diamond compact (PDC) cutters, which seriously restricts the rock-breaking efficiency of PDC bits. Based on the highly abrasive geological characteristics of the Western Sichuan block, a design method for the hybrid distribution of elliptical and circular PDC cutters is proposed. By establishing the cutting geometry model of elliptical PDC cutter bits and analyzing the cutting characteristics of elliptical PDC cutters under multiple working conditions, a Ø241.3&#xa0;mm novel PDC bit was designed. Full-scale PDC bit indoor experiments were conducted, and applications were carried out in the Xujiahe block. The research results indicate that the drilling speed of the novel PDC bit is 1.69&#xa0;m/h, which is 85.7% higher than the average drilling speed of the same well section. After exiting the well, only one elliptical PDC cutter was fractured, and the overall wear degree of the PDC bit was low. The conclusion states that lengthening the geometric characteristics of the elliptical PDC cutter and employing a mixed arrangement strategy can effectively optimize the rock-breaking energy distribution, providing a new technical scheme for efficient drilling in high-abrasive formations.</p>

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Cutting Mechanism of Elliptical PDC Cutter and Application in Highly Abrasive Formations

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Yangqing Sun,
  • Yingxin Yang,
  • Haitao Ren,
  • Shiwei Niu,
  • Lingqiang Zhou

摘要

As a “hard bone” in the drilling process, high-abrasive tight formation causes serious wear to conventional polycrystalline diamond compact (PDC) cutters, which seriously restricts the rock-breaking efficiency of PDC bits. Based on the highly abrasive geological characteristics of the Western Sichuan block, a design method for the hybrid distribution of elliptical and circular PDC cutters is proposed. By establishing the cutting geometry model of elliptical PDC cutter bits and analyzing the cutting characteristics of elliptical PDC cutters under multiple working conditions, a Ø241.3 mm novel PDC bit was designed. Full-scale PDC bit indoor experiments were conducted, and applications were carried out in the Xujiahe block. The research results indicate that the drilling speed of the novel PDC bit is 1.69 m/h, which is 85.7% higher than the average drilling speed of the same well section. After exiting the well, only one elliptical PDC cutter was fractured, and the overall wear degree of the PDC bit was low. The conclusion states that lengthening the geometric characteristics of the elliptical PDC cutter and employing a mixed arrangement strategy can effectively optimize the rock-breaking energy distribution, providing a new technical scheme for efficient drilling in high-abrasive formations.