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基于波动方程建立震击器震击作业过程中的震击碰撞纵向冲击振动模型,并结合震击器工作时的特殊边界条件和初始条件,推导出震击器作业时下部钻杆在上部钻杆冲击作用下的位移、应力、速度分布的解析表达式,并由此得到了碰撞过程的冲击持续时间。最后结合油田施工现场的实际工作情况,运用ANSYS仿真模拟碰击过程中下部钻杆在纵向冲击作用下的各种响应,与上述理论推导的解析解相对比,结果表明两者匹配良好,由此验证解析解的可靠性。
Based on the wave equation, the longitudinal impact vibration model of shock impact during jar operation was established. Based on the special boundary conditions and initial conditions of the jar operation, The analytical expressions of displacement, stress and velocity distribution under impact are obtained, and the impact duration of the collision process is obtained. Finally, based on the actual working conditions of the oilfield construction site, the ANSYS simulation is used to simulate the response of the lower drill pipe under the impact of longitudinal impact. Compared with the analytic solution derived from the above theory, the results show that the two match well, Verify the reliability of the analytical solution.