建立了底部钻具组合动态分析的数值模型,推导了动态分析的有限元微分方程。取井眼的轴线作为参考位置,井眼的弯曲效应由初应力代替,推导了初应力引起的等效结点力的计算式。 The numerical model of bottom hole assembly dynamic analysis was established and the finite element differential equation of dynamic analysis was deduced. Taking the axis of wellbore as a reference position, the bending effect of wellbore is replaced by initial stress, and the formula of equivalent node force caused by initial stress is deduced.