• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (5): 119-135.doi: 10.3901/JME.2022.05.119

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Study on Axial-lateral-torsion Coupling Vibration Model and Stick-slip Characteristics of Drilling String in Ultra-HPHT Curved Wells

GUO Xiao-qiang1, LIU Jun1,2, WANG Jian-xun1, LI Xiao1, WEI An-chao3, ZHU Hai-yan4   

  1. 1. School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500;
    2. School of Mechanical Engineering, Chengdu University, Chengdu 610106;
    3. Zhanjiang Branch, CNOOC (China) Co. Ltd, Zhanjiang 524057;
    4. School of Energy, Chengdu University of Technology, Chengdu 610059
  • Received:2021-05-07 Revised:2021-11-22 Online:2022-03-05 Published:2022-04-28

Abstract: Aiming at the vibration failure of drill string system in ultra-high temperature and high pressure(ultra-HPHT) curved well,the axial-lateral-torsion nonlinear coupling vibration model of drill string system is established using finite element method, energy method and Hamiltonian principle. The influence of wellbore trajectory change, wellbore constraint, interaction between bit and rock and ultra-HPHT of wellbore on elastic modulus of drill string and viscosity of drilling fluid are considered. The finite element method(FEM) are used to realize the numerical solution of the nonlinear vibration model. The correctness and effectiveness of the axial-lateral-torsion nonlinear coupling vibration model is verified by comparing the measured data on-site with the theoretical calculation results of the model. Based on this, with the help of the parameters of M directional well in Ledong ultra-HPHT block,South China Sea, the vibration response characteristics and stick slip vibration characteristics of the drill string system are analyzed. It is found that, when other requirements were met(for example, the strength of tools, low friction torque of drilling string and well trafficability of tools), the rotary speed and bottom hole assembly(BHA) length should be increased as much as possible, which can effectively improve the drilling efficiency. An optimize parameters of weight on bit(WOB) and the torsional impact tool were exist which depended on the well structure, downhole tool size, etc. and can be determined using the proposed analysis method, so as to effectively improve the drilling efficiency and the safety of BHA tools.

Key words: ultra-HPHT, drill string system, nonlinear vibration, stick-slip vibration characteristics, rate of penetration

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