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在分析注水油藏压力不稳定特征的基础上 ,导出了由于油水性质差异产生的拟表皮因子、前缘含水率导数与油水相对渗透率、含水饱和度的关系。提出了应用注水井压力落差试井分析求取拟表皮因子、前缘含水率导数之后 ,用拟牛顿法解方程组 ,求含水饱和度指数 ,继而确定油水相对渗透率的方法。实例计算表明该方法切实可行。
Based on the analysis of the characteristics of pressure instability in waterflooding reservoirs, the relationship between the quasi-epidermal factor, the leading edge moisture content derivative and the relative permeability and water saturation of oil-water is derived. This paper presents a method to find the water saturation index and then determine the relative permeability of oil and water by solving the equation set by quasi-Newton method after obtaining the derivative of the quasi-Newton’s equation by using well test analysis of pressure drop in the injection well. The example calculation shows that this method is feasible.