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<p>During the drilling process, stick–slip vibration caused by torsional vibration is one of the most harmful factors to the drill string system, because it seriously affects bit life and drilling efficiency. To solve this problem, researchers have conducted extensive theoretical analyses, field and laboratory tests, as well as simulation studies, having achieved certain progress. However, to the author's knowledge, only a few scholars have carried out researches on horizontal wells, and these studies have not considered the effect of drilling fluid on the drill string as non-Newtonian rheological damping. Therefore, based on the spring-lumped mass principle, this paper comprehensively considers the frictional interaction between the horizontal string drill bit and the formation, the non-Newtonian rheological damping of drilling fluid, as well as the friction between the horizontal section drill string and the wellbore wall. It establishes a longitudinal–torsional coupling model for the horizontal well drill string system and explores in detail the stick–slip vibration characteristics of the horizontal drill string under different contact conditions. The simulation results indicate that as formation stiffness increases from 20 MN/m to 100 MN/m, the stick–slip vibration intensity of the bit intensifies, with a hysteresis angular displacement of 43.67&#xa0;rad occurring when the formation stiffness reaches 100 MN/m. Additionally, a larger formation surface profile amplitude reduces the stick–slip vibration intensity, and stick–slip vibration no longer occurs when this amplitude is 2&#xa0;mm. Through simulation, this study analyzed the influencing factors of stick–slip vibration in horizontal wells and put forward relevant engineering recommendations.</p>

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Analysis of Stick–Slip Vibration Characteristics of an Axial–Torsional Coupled Vibration Model in Horizontal Drill Strings

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Liangjie Mao,
  • Xinjie Zhao,
  • Lefan Zhang,
  • Xin He,
  • Feng Zhu

摘要

During the drilling process, stick–slip vibration caused by torsional vibration is one of the most harmful factors to the drill string system, because it seriously affects bit life and drilling efficiency. To solve this problem, researchers have conducted extensive theoretical analyses, field and laboratory tests, as well as simulation studies, having achieved certain progress. However, to the author's knowledge, only a few scholars have carried out researches on horizontal wells, and these studies have not considered the effect of drilling fluid on the drill string as non-Newtonian rheological damping. Therefore, based on the spring-lumped mass principle, this paper comprehensively considers the frictional interaction between the horizontal string drill bit and the formation, the non-Newtonian rheological damping of drilling fluid, as well as the friction between the horizontal section drill string and the wellbore wall. It establishes a longitudinal–torsional coupling model for the horizontal well drill string system and explores in detail the stick–slip vibration characteristics of the horizontal drill string under different contact conditions. The simulation results indicate that as formation stiffness increases from 20 MN/m to 100 MN/m, the stick–slip vibration intensity of the bit intensifies, with a hysteresis angular displacement of 43.67 rad occurring when the formation stiffness reaches 100 MN/m. Additionally, a larger formation surface profile amplitude reduces the stick–slip vibration intensity, and stick–slip vibration no longer occurs when this amplitude is 2 mm. Through simulation, this study analyzed the influencing factors of stick–slip vibration in horizontal wells and put forward relevant engineering recommendations.