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应用弹性动力学分析方法, 在合理假设的基础上, 建立了震击作用动力学模型。模型将上击器震击解卡过程分为储能阶段、震击前阶段、震击阶段和震击后阶段。根据该动力学模型, 对现场某直井进行了实例计算, 结果表明, 在上击器震击解卡过程中, 只有作用在卡点的震击力才是真正起作用的震击动载荷, 如果该动载荷小于粘卡力, 则难以解卡。上击器震击时产生的震击力与上提拉力的比值不是固定值, 而是随钻柱结构变化而变化。一般而言, 上击器越靠近卡点, 解卡效果越好。
Applying the method of elastic dynamic analysis, the dynamic model of shock action is established on the basis of reasonable assumptions. The model divides the attacker’s jamming and jamming process into energy storage phase, pre-shock phase, shock phase and post-shock phase. According to this dynamic model, an example of a vertical well in the field is calculated. The results show that in the process of jammer jamming, only the shock force acting on the jam point is the true dynamic shock load. If The dynamic load is less than the stick force, it is difficult to solve the card. The ratio of the shock force to the pull-up force generated by the strike of the attacker is not a fixed value but varies with the change of the drill string structure. In general, the closer the attacker to the card point, the better the solution.