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中文摘要：
当油田进入特高含水期以后，在半对数坐标系下，油水相对渗透率比（Kro／Krw）与含水饱和度（Sw）的关系曲线直线段再次向下发生偏折，出现第二段直线段。在此基础上引进了二段直线法，即甲型水驱规律曲线在中高含水期及特高含水期各成直线段，可用于油藏开发预测和油田动态分析。通过对特高含水期采液指数、吸水指数和含水上升速度变化规律的研究，发现实际的采液、吸水指数和含水上升速度因结构调整的对策不同，变化规律不同。对特高含水期水驱油田开发具有一定的指导意义。
英文摘要：
When the oilfield enters the ultra-high water cut period, the straight line of the curve of the ratio of oil-water relative permeability Kro/Krw and the value of water saturation Sw under semi-log coordinate coordinates deflects downward and a second straight line appeared. Based on this, the two straight line method is introduced, that is, type A water drive curve was separated a straight line in the medianhigh water cut and the ultra-high water cut period, it can be applied to the oilfield development prediction and the dynamic analysis. It was found that the changes of index of producing fluid, index of absorbing water and the increased speed of water cut in the ultra-high water cut period are different due to different measures. It provides certain guidance for the development of ultra-high-water-cut reservoir.
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