• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2025, Vol. 61 ›› Issue (23): 134-144.doi: 10.3901/JME.2025.23.134

Previous Articles    

Experimental and Numerical Simulation Research on the Nonlinear Coupled Longitudinal-torsional Vibration of a Drill-string

XIE Dou1, WU Qinyao1, SHE Lunyuan1, ZOU Min1, WANG Changcheng1, LI Weicheng2   

  1. 1. School of Mechanical Engineering, Xihua University, Chengdu 610039;
    2. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004
  • Received:2024-12-24 Revised:2025-08-03 Published:2026-01-22

Abstract: The nonlinear coupled longitudinal-torsional vibration of a drill-string is investigated by using a novel multifunctional experimental drilling rig capable of simulating key vibration modes, including stick-slip, bit-bounce, whirling, and helical buckling. Experimental and parametric studies first elucidate the stick-slip vibration mechanism and the longitudinal-torsional coupling effects. Results demonstrate that increasing the driving speed and reducing the effective weight-on-bit can help to alleviate the torsional vibration of drill-string and even eliminate the stick-slip phenomenon. Subsequently, steady-state drilling experiments examine bit-rock interaction, leading to the development of a mathematical model with characteristic parameter identification. Based on these findings, a lumped parameter model incorporating stick-slip, bit-bounce, and the regeneration effect of rock-breaking is established. The model's validity is confirmed through excellent agreement between simulations and experimental data, enabling further numerical analysis of nonlinear coupled longitudinal-torsional vibration. The research results provide theoretical basis for optimizing drill-string structure and drilling parameters to suppress harmful vibration and enhance drilling efficiency.

Key words: drill-string system, coupled longitudinal-torsional vibration, stick-slip vibration properties, bit-rock interaction, lumped parameter model

CLC Number: