基于水驱开发全过程的新型水驱特征曲线

A New Water-Flooding Characteristic Curve Based on the Whole Water-Flooding Process

注水开发油藏高含水期,油水相对渗透率之比与含水饱和度不再为线性关系,导致传统的水驱特征曲线不再适用。针对上述问题,基于Willhite相对渗透率曲线表征公式,提出了适应于水驱开发全过程的油水相对渗透率比值与含水饱和度的关系式,结合油藏工程方法,得到新型水驱特征曲线。将新型水驱特征曲线应用于江苏油田高6断块,综合含水率为92%时,新型水驱特征曲线的预测误差为1.24%,比常规乙型水驱特征曲线的拟合效果更好,预测误差更小。该研究成果对水驱油藏高含水期开发调整具有重要意义。

The oil-water relative permeability ratio no longer linearly correlates with water saturation in the high watercut stage of waterflooding development,which leads to certain limitations to the traditional waterflooding characteristic curve application. According to the Willhite relative permeability equation,a correlation between the oilwater relative permeability ratio and water saturation was proposed for the whole waterflooding process. A new waterflooding characteristic curve was gained by combining with the conventional reservoir engineering method. This new waterflooding characteristic curve was applied to the Faultblock Gao6 in Jiangsu Oilfield. The relative forecast error is only 1. 24% when the comprehensive watercut is 92%,which is more effective and accuracy than that of traditional B waterflooding characteristic curve. This research could provide certain significance for the development and adjustment of waterflooding reservoir in high watercut stage.