具有最大产量点的新型流入动态方程及其应用

国内外越来越多的注水开发油田生产资料呈现出一种新的流入动态曲线——曲线凹向压力轴，有一个最大产量点。将油相拟稳态流动方程与油相和液相相对流动能力方程相结合，建立了描述具有最大产量点的流入动态曲线的新型流入动态方程，可用来有效分析和预测某些注水开发油田油井的生产动态。根据新型流入动态方程导出提液稳油允许的最小流压界限方程，可确定油井提液稳油的合理工作制度。用实例计算说明新型流入动态方程的应用步骤和结果，计算值与实测值的比较证实该方程可以满足油藏工程精度要求，能确定具体油井允许的最小流压界限，为提液稳油提供技术支持。

A new inflow performance equation for the IPR curves with maximum flow rate and its application

The performance data from more waterflooding oilfields exhibit a new IPR curve concaving to the pressure axial and showing a maximum flow rate point. Combining pseudo-stable flow equation with relative flow behavior equation of oil and liquid phases leads to the establishment of a new inflow performance equation that can describe the IPR curve with maximum flow rate point. The equation can be used effectively to analyze and predict production behavior of some waterflooding oilfields and to derive an equation to determine the flowing pressure limit for stabilizing oil recovery rate with increasing liquid recovery rate. The comparison of the calculations with the field measurements verifies that the equation can meet the accuracy requirements in the context of reservoir engineering and can determine the allowable minimum flowing pressure of production well.