基于油田实测相对渗透率数据的统计分析,提出了高含水饱和度下油水相对渗透率比值与归一化含水饱和度间的新型函数表达式,实现了对常规相对渗透率比值关系曲线后段较为精确的拟合。利用新型油水相对渗透率比值表征关系式,结合油藏工程方法推导出两种适用于油田开发特高含水阶段(含水率大于90%)的新型水驱特征曲线。分别采用五点井网数值模拟结果和羊二庄油田、柳赞油田某区块实际生产数据,对新型水驱特征曲线的实用性进行了验证,结果表明,在甲型或乙型水驱特征曲线发生上翘以后,新型水驱特征曲线较常规水驱特征曲线的预测误差小,可用于预测特高含水阶段的油田生产动态、确定最终采收率以及可采储量。图7表4参18
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