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<p>To simulate the stress environment of oil and gas drilling and examine the crushing effect of spherical and conical inserted teeth from a disc-like hybrid bit on green sandstone under varying penetration speeds and depths, an in situ stress triaxial tooth penetration rock-breaking system was developed. The study considered tooth shape, penetration depth, and penetration speed as key rock-breaking parameters. The brittleness index was used to evaluate rock fragmentation difficulty, while specific energy consumption assessed energy utilization efficiency. The morphology of fracture pits was quantitatively analyzed via three-dimensional contour scanning. Results show that both brittleness index and specific energy consumption increase with penetration speed and depth, indicating that excessive depth hinders fragment formation and increases energy demand. Compared to spherical teeth, conical teeth exhibit a lower brittleness index. Spherical teeth demonstrate superior fractal performance in terms of specific energy consumption. Penetration speed and depth have minimal influence on the crushing pit area of conical teeth but significantly reduce the pit area generated by spherical teeth. Thus, conical teeth are more suitable for pilot penetration, whereas spherical teeth are more effective in subsequent penetration stages for generating cracks and producing fragments.</p>

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Experimental Study on Rock-Breaking Difference Under Different Penetration Parameters of Disc-Like Hybrid Bit Spherical and Conical Inserted Teeth Under In Situ Stress Environment

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Xin Huang,
  • Weihao Yang,
  • Jucai Chang,
  • Jianyong Pang,
  • Chuanming Li,
  • Jiuqun Zou,
  • Haoxiang Tu

摘要

To simulate the stress environment of oil and gas drilling and examine the crushing effect of spherical and conical inserted teeth from a disc-like hybrid bit on green sandstone under varying penetration speeds and depths, an in situ stress triaxial tooth penetration rock-breaking system was developed. The study considered tooth shape, penetration depth, and penetration speed as key rock-breaking parameters. The brittleness index was used to evaluate rock fragmentation difficulty, while specific energy consumption assessed energy utilization efficiency. The morphology of fracture pits was quantitatively analyzed via three-dimensional contour scanning. Results show that both brittleness index and specific energy consumption increase with penetration speed and depth, indicating that excessive depth hinders fragment formation and increases energy demand. Compared to spherical teeth, conical teeth exhibit a lower brittleness index. Spherical teeth demonstrate superior fractal performance in terms of specific energy consumption. Penetration speed and depth have minimal influence on the crushing pit area of conical teeth but significantly reduce the pit area generated by spherical teeth. Thus, conical teeth are more suitable for pilot penetration, whereas spherical teeth are more effective in subsequent penetration stages for generating cracks and producing fragments.