利用相渗曲线预测油井流入动态的新方法

A New Method of Predicting Inflow Performance of Oil Well by Using Phase Permeation Curve

近年来,越来越多试井资料证实,注水保持压力开发的油田,当井底流压低于饱和压力后,流入动态曲线向压力轴偏转并出现最大产量点。经研究,提出了一种利用相渗曲线预测油井气液两相流入动态的新方法,考虑了低渗透油藏启动压力梯度和油井井底出现气、液两相流动的影响,从理论上解释了上述实际问题,可用来确定油井最低允许流动压力和启动生产压差,预测不同含水、不同流动压力下采油井的产量。

Recent years, more and more testing data show that for developing oilfield by water injection to keep pressure, when flowing pressure at bottom less than that of saturation pressure, inflow performance curve deflects to pressure axial and appears the maximal point. Based on researching phase penetration curve, a new method of predicting inflow performance relationship of oil wells is present, considering the influence of start-up pressure gradient in low permeability reservoirs and two phases flow of gas and liquid at the bottom of oil wells. It theoretically interprets the above actual problems, determines the minimum allowable flowing pressure and start-up drawdown pressure and predicts the oil wells' productivity under condition of different water cut and flowing pressure.