不同供液状况的有杆抽油泵举升过程参数模拟计算方法

A simulation calculation method for the lift process parameters of sucker-rod pump under different liquid supplying conditions

有杆抽油泵举升过程中,根据供液能力的差别,分别确定了泵吸入口压力和活塞受力的计算方法;在静态模型建立的基础上,以抽油杆受力波动方程为指导,对井筒举升过程抽油杆运动阻尼系数计算方法进行了修正,建立了有杆抽油泵举升动态模型。以地面实测示功图为约束,计算不同供液工况下井筒纵向空间的压力、抽油杆柱受力等数值分布,对泵吸入口压力、动液面、地层流压等参数进行模拟计算,建立了不同供液状况下有杆抽油泵举升过程参数连续模拟计算方法。研究结果表明,该方法能够满足供液不足工况下油井动液面计算的精度要求,为井筒举升分析、工作制度优化调整提供了理论依据。

The methods for calculating pump intake pressure and piston stress were determined respectively based on the differences of liquid supply capacity in the lift process of sucker-rod pump.After the static model was established,the method for calculating the damping factor in the process of well lift was modified according to the sucker-rod wave theory,and the dynamic model of the lift of sucker-rod pump was established.the numerical distribution of pressure and sucker rod string stress in the vertical space of well under different liquid supplying conditions was calculated under the constraint of surface dynamometer card,the pump intake pressure,dynamic liquid level,formation flow pressure and other parameters were simulation calculated,and the method for the continuous simulation calculation of the lift process parameters of sucker-rod pump under different liquid supplying conditions was established.The research results show that this method can meet the required calculation accuracy of dynamic liquid level in oil wells under the working conditions with insufficient liquid supply and provide theoretical basis for the analysis and working system optimization and adjustment of well lift.