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钻柱在上提、下放的开始和终了悬点的应力要发生很大变化,其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。本文在解有体积力作用下的一维波动方程的基础上计算钻柱截面的突发速度及泥浆压力的突发变化。从而说明井下发生的现象,说明钻柱的突发速度和井下发生的反压差对井下工具的破坏作用。由本文的分析可以看出钻柱不论是上提还是下放,缓慢停止是非常重要的。
Drill column in the mention, the decentralization of the beginning and the end of the hanging point of the stress changes to occur, of which the above mentioned process at the end of the greatest changes. The change in stress at the hanging point produces a velocity wave and a stress wave that pass down the drill pipe. Based on the one-dimensional wave equation under the action of bulk force, this paper calculates the burst velocity and the sudden change of the mud pressure in the section of the drill string. This shows the downhole phenomenon, indicating the burst speed of the drill string and downhole downhole differential pressure on the destruction of the role of tools. It can be seen from the analysis of this article that it is very important whether the drill string is raised or lowered.