在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
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