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用有限元法的间隙元理论对侧钻水平井下部钻具进行了力学分析研究,考虑了钻柱与井壁之间的接触摩擦阻力和阻力矩对钻具受力变形的影响,从而计算钻头处变井斜力.根据钻压和钻头处变井斜力,对钻具造斜性能进行预测,为139.7mm套管内侧钻水平井钻具的工程设计和施工决策提供了理论依据,为优选下部钻具组合提供了实用计算方法.经现场应用,钻具造斜率平均误差为8.6%.
The finite element method of gap element theory is used to study the mechanics of the lateral drilling of the lower horizontal drilling tool. The influence of the contact friction resistance and the resistance moment between the drill string and the lining wall on the deformation of the drilling tool is considered, Change the well inclination. According to the weight-on-bit and drill-bit changing inclination, the prediction of the beveling performance of the drill tool provides a theoretical basis for the engineering design and construction decision-making of the 139.7 mm casing horizontal drilling horizontal well drilling tool, and provides the basis for optimizing the lower- A practical method of calculation. The field application, the average error of the drilling tool made of 8.6%.