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Numerical modelling and field experimental validation of the axial load transfer on the drill-strings in deviated wells
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.jngse.2019.103124
Yuchun Kuang , Wei Lin , Yang Liu , Qin Wang , Jianzhong Zhang

Abstract This paper studies the axial load transfer along the drill-strings in deviated wells by developing a finite element model based on the Euler beam theory and the augmentation Lagrangian contact algorithms. The model can simulate the entire drill-strings showing nonlinear contact model between drill-strings and casing. Special attention is given to the axial load loss, the pipe-casing contact force distribution and the slender pipe deformation. The efficacy of the proposed model is validated experimentally using a packer releasing procedure. Various drill-string factors, such as deviation angle, dogleg severity, hook load magnitude and buckling configurations, are considered for evaluating the efficiency of axial load transfer. Our analysis shows that the dogleg severity has a significant influence on the transfer, and the helical buckling of the drill-strings due to excessive loading could make it worse. This study provides a theoretical understanding of the variation of the contact force and the axial load transfer for the drill-strings in deviated wells. It can be used to better understand the working condition of downhole and guide field drilling.

中文翻译:

斜井钻柱轴向载荷传递数值模拟及现场试验验证

摘要 本文通过建立基于欧拉梁理论和增广拉格朗日接触算法的有限元模型,研究斜井中沿钻柱的轴向载荷传递。该模型可以模拟整个钻柱,显示出钻柱与套管之间的非线性接触模型。特别注意轴向载荷损失、管-套管接触力分布和细长管变形。使用封隔器释放程序通过实验验证了所提出模型的有效性。各种钻柱因素,如偏角、狗腿严重程度、大钩载荷大小和屈曲配置,都被考虑用于评估轴向载荷传递的效率。我们的分析表明,狗腿严重程度对转移有显着影响,并且由于过度加载而导致的钻柱螺旋屈曲可能会使情况变得更糟。该研究为斜井中钻柱的接触力变化和轴向载荷传递提供了理论理解。可用于更好地了解井下工作状况和指导现场钻井。
更新日期:2020-03-01
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