低渗透油藏油水相渗曲线影响因素分析

Analysis on Influence Factors of Oil-water Relative Permeability Curve in Low Permeability Reservoirs

在关于低渗透油层储藏渗流特征的变化探究过程中,借助于对低渗透油藏油水相渗曲线的作用要素进行认识研究,结果表明:存在渗透率差异的油藏对于油水相渗曲线的影响是相异的,在油和水的相渗曲线图形中可以看出,其中两相的渗流区域会跟着渗透率的变低而变小,随着渗透率愈发升高,则两相区就会愈发变大。当温度低于油层储藏温度时,由于温度的升高,油水两相共流区区域变大,但高于油层储藏温度时,跟着温度持续升高,油水相渗曲线的改变较小。活性剂驱可以十分明显的增大油水两相渗流区,由于界面张力的不断下降,油相的相对渗透率会增大,残余油饱和度下降。

During researching the change of percolation characteristics in low permeability reservoirs, the influence factors of oil-water relative permeability curves in low permeability reservoir were analyzed. The results show that different permeability of reservoir has different effect on oil and water relative permeability curve; the oil-water two-phase percolation area decreases with decreasing of the permeability, the higher the permeability, the bigger the two-phase seepage zone. When the temperature is lower than the reservoir temperature, with the increase of temperature, the change of oil-water relative permeability curve is not obvious. Surfactant flooding can obviously increase oil-water two phase flow area;with the decrease of the interfacial tension, oil phase relative permeability increases, residual oil saturation reduces.