根据流体力学理论,压井排量对流体摩阻具有重要影响。针对天然气空井的压井计算,基于已有相关模型,将压井排量作为未知数,考虑了压井排量对摩阻的影响,改进了空井救援井压井的拟瞬态模型,并通过数学计算软件得到压井排量的计算方法。数值计算结果表明:压井排量随着压井液密度的增大而减小,随着井眼尺寸的增大而增大,随着井深的增加而减小;实例验证的误差控制在1%以内,表明该计算方法可以达到现场精度要求,对后续类似井的压井作业具有一定的指导意义。

According to the fluid dynamics theory, the kill rate has an important effect on the fluid friction. So in order to calculate the kill rate of empty well control, the kill rate's effect based on previous models is considered, the quasi-transient model of rescue well killing in empty wells is improved, and a mathematical computing software is used to calculate the kill rate. The numerical calculation results show that: the kill rate has a negative relation with the density of kill fluidand the depth of the well, but has a positive relation with the size of boreholes. The validation's error is controled with in 1%, indicating that the calculation method can achieve the field accuracy requirements, so subsequent similar wells killing can get certain guidance from this study.