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考虑小井眼细长钻柱沿井深和井眼圆周方向的随机接触碰撞，建立了钻柱瞬态动力学模型。运用动力间隙元不仅能合理描述钻柱与井壁的接触碰撞过程，还能考虑井壁变形和泥饼的能量吸收，并用Ｎｅｗｍａｒｋ法求解钻柱动力学平衡方程。通过钻井全尺寸模型装置上的钻柱动力学试验，对理论计算结果进行了验证，也为钻头干扰力确定提供了依据。经大庆油田１４口小井眼井应用表明，由钻柱动力学分析所设计的钻柱结构没有发生井下断钻具事故，防斜性能也比较好，机械钻速得到明显提高。
Considering the random contact and collision between the wellbore and the wellbore in the wellbore, a transient dynamic model of the drill string was established. The use of dynamic clearance element not only can reasonably describe the contact and collision between the drill string and the borehole wall, but also can take into account the deformation of the borehole wall and the energy absorption of the mud cake. The dynamic equilibrium equation of the drill string is solved by Newmark method. Through the drill string dynamics test on the drilling full-scale model device, the theoretical calculation results are verified, which also provides the basis for the determination of the bit interference force. The application of 14 wells in Daqing Oilfield shows that there is no downhole drilling tool accident occurred in the drill string structure designed by the dynamic analysis of the drill string, and the anti-tilting performance is also good, and the penetration rate of the machine is obviously improved.