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<p>Drill string dynamics in horizontal wells are more complex than in vertical or deviated wells due to significant wall contact, leading to higher failure risks. Moving beyond localized analyses and simplified equal-diameter models, this study establishes a comprehensive nonlinear model of the entire drill string within the ADAMS multibody dynamics environment. The model incorporates the actual drill string assembly, borehole trajectory, and contact mechanics to simulate key drilling operations: lifting, lowering, rotary drilling, and sliding. Results quantitatively reveal a highly non-uniform and condition-dependent distribution of torque and drag. Critically, the build-up section is identified as the dominant source of torque and drag. The analysis further demonstrates significant asymmetry between tripping-in and tripping-out drag, and captures the nonlinear, substantial increase in friction force induced by hookload-driven buckling. This work provides an enhanced theoretical basis for optimizing tool selection, wellpath design, and drilling parameters in horizontal wells.</p>

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Multi-body dynamics model of horizontal well drillstring and analysis of torque and drag

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Zebing Wu,
  • Yifei Lin,
  • Zhe Li,
  • Jun Xu,
  • Zhe Yan,
  • Zihao Zhang,
  • Kenan Liu,
  • Xiaochun Zhu

摘要

Drill string dynamics in horizontal wells are more complex than in vertical or deviated wells due to significant wall contact, leading to higher failure risks. Moving beyond localized analyses and simplified equal-diameter models, this study establishes a comprehensive nonlinear model of the entire drill string within the ADAMS multibody dynamics environment. The model incorporates the actual drill string assembly, borehole trajectory, and contact mechanics to simulate key drilling operations: lifting, lowering, rotary drilling, and sliding. Results quantitatively reveal a highly non-uniform and condition-dependent distribution of torque and drag. Critically, the build-up section is identified as the dominant source of torque and drag. The analysis further demonstrates significant asymmetry between tripping-in and tripping-out drag, and captures the nonlinear, substantial increase in friction force induced by hookload-driven buckling. This work provides an enhanced theoretical basis for optimizing tool selection, wellpath design, and drilling parameters in horizontal wells.