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<p>This study investigated the friction characteristics of drill pipes in directional long-hole drilling operations in coal mines, addressing key engineering challenges including high friction resistance, low drilling efficiency, and the risk of pipe sticking. Given the contact mechanics between the drill pipe system and the borehole wall, an axial friction resistance model for drill pipes was established. The model comprehensively incorporated factors including borehole depth, formation combinations, friction coefficients, and borehole inclination. Furthermore, through multi-condition numerical simulations, the variation patterns of friction resistance under different geological formations and drilling parameters were systematically analyzed. The results indicate that axial friction exhibited a nonlinear cumulative trend with increasing borehole depth. Specifically, each 100&#xa0;m increase in depth resulted in an extra frictional resistance of ~ 10 kN–12 kN, with variations of ~ 7 kN across different formation combinations. Furthermore, borehole inclination and rig thrust exhibited a more significant influence on the friction accumulation rate, whereas drill pipe rotational speed and torque exhibited comparatively weaker effects. These findings provided quantitative support and practical guidance for friction control, optimization of drilling parameters, and risk prediction in long-reach directional drilling operations in coal mines.</p>

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Study on the friction distribution characteristics of directional long-hole drill pipe systems

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Yan Baoyong,
  • Yang Yinglin,
  • Chen Zeping,
  • Li Meng,
  • Yang Haili

摘要

This study investigated the friction characteristics of drill pipes in directional long-hole drilling operations in coal mines, addressing key engineering challenges including high friction resistance, low drilling efficiency, and the risk of pipe sticking. Given the contact mechanics between the drill pipe system and the borehole wall, an axial friction resistance model for drill pipes was established. The model comprehensively incorporated factors including borehole depth, formation combinations, friction coefficients, and borehole inclination. Furthermore, through multi-condition numerical simulations, the variation patterns of friction resistance under different geological formations and drilling parameters were systematically analyzed. The results indicate that axial friction exhibited a nonlinear cumulative trend with increasing borehole depth. Specifically, each 100 m increase in depth resulted in an extra frictional resistance of ~ 10 kN–12 kN, with variations of ~ 7 kN across different formation combinations. Furthermore, borehole inclination and rig thrust exhibited a more significant influence on the friction accumulation rate, whereas drill pipe rotational speed and torque exhibited comparatively weaker effects. These findings provided quantitative support and practical guidance for friction control, optimization of drilling parameters, and risk prediction in long-reach directional drilling operations in coal mines.