高含水期水驱曲线的推导及上翘问题的分析

甲型和乙型水驱曲线，是预测水驱油田可采储量和采收率的重要方法之一。然而，当油田开发进入高含水期之后，甲型和乙型水驱曲线总会发生上翘现象，并影响到方法的有效应用。基于油田两相流动的基本原理，对高含水期的甲型和乙型水驱曲线，进行了重新推导，并对其后期上翘问题作了有效的理论分析。利用甲型和乙型水驱曲线确定了可采储量和采收率，经济极限含水率为９５％或水油比１９时外推的结果是可靠的。

Derivation of Water Drive Curve at High Water-Cut Stage and Its Analysis of Upwarding Problem

A type and B type Water drives are important methods to predict recoverable reserves and recovery efficiency of water drive oilfields. However,after oilfield enter high water-cut stage, A type and B type water drive curves start to upward,at this time,the use of the methods are invalid. According to fundamentals of oil-water two phase now,A type and B type water drive curves at high water-cut stage are derived and given theortical analysis of water drive curve upward in this paper.