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文章通过水平井井内切点以上非垂直井段钻柱弯曲刚性对轴力和摩擦力的影响分析 ,采用了弹性梁的变形微分方程以及单元体的静力平衡和力矩平衡关系 ,建立了钻进时轴力的二维计算模式。同时 ,对切点以下导向动力钻具组合采用纵横弯曲法大变形进行分析时 ,考虑了动力钻具结构弯曲角的影响 ,得出导向动力钻具三弯矩方程组 ,并对DTU钻具组合中第二段梁内存在方向相反的两个结构弯角对其梁柱左右端转角增量及变形前后的梁柱右端位移值进行分析 ,得出了DTU钻具组合的井底钻压计算模式。并给出了利用钻进时的钻重和视压力 ,计算出井底钻压的方法及步骤
Based on the analysis of the influence of the bending stiffness of drill string on the axial force and friction force above the non-vertical wellbore in the horizontal well, the deformation differential equation of the elastic beam and the static balance and moment balance of the unit body are adopted. Time axis of the two-dimensional computing model. In the meantime, the influence of the bending angle of the dynamic drilling structure is taken into account when using the large deformation of longitudinal and transverse bending method for the following guided power drill assembly. The three-moment equations of the power steering drill are obtained, In the second section of the beam there are two opposite angles in the structure of the corner of the beam left and right corner of the incremental and post-deformation of the right and left beam displacement analysis, obtained DTU drill hole bottom hole compaction calculation mode . And gives the method and steps of calculating the bottom hole WOB using the weight of drilling and visual pressure when drilling