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在水驱项目中,油藏工程师计算的最重要的参数之一是平均含水饱和度随时间的变化,以此估算采收率。运用多年的图形分析法可以得到水突破后的平均含水饱和度。但是,使用该技术容易出现误差,因为难以确定分相流动曲线切线与该曲线交叉的确切点。根据相对渗透率驱替数据和油-水黏度比进行的所有分相流动计算,推导出了新函数。新函数有4个参数,它们随着流度比变化。介绍了确定新函数的4个参数的步骤,并且用油田实例验证了其应用优势。
In a water-flooding project, one of the most important parameters calculated by a reservoir engineer is the change in mean water saturation over time to estimate the recovery. Using years of graphical analysis can get the water after the average water saturation. However, the use of this technique is prone to errors because it is difficult to determine the exact point at which the split-phase flow curve tangent crosses the curve. A new function was derived from all phase-separated flow calculations based on relative permeability displacement data and oil-water viscosity ratio. The new function has 4 parameters, which vary with the flow ratio. The steps of determining the four parameters of the new function are introduced, and its application advantages are verified by field examples.