裂缝性底水油藏中水平井两相渗流模型

TWO-PHASE FLOW IN A HORIZONTAL WELL PENETRATING A NATURALLY FRACTURED RESERVOIR UNDER BOTTOM WATER DRIVE

本文研究裂缝性底水油藏中水平井两相渗流问题。在流线不变的假定下，建立了底部注水时双重孔隙介质中水平井油、水两相垂直剖面二维渗流的数学模型，并用特征线方法进行了精确求解，给出了裂缝系统和岩块系统中的含水饱和度分布以及水平井见水时间公式，从而为利用水平井开采裂缝性底水油藏提供了必要的理论基础和计算方法。

This paper examines two-phase flow in a horizontal well penetrating a naturally fractured reservoir under bottom water drive. a mathematical model describing the vertical two-dimensional flow of oil-water in a horizontal well in a double-porosity mediun under bottom water injection is established, and its accurate solutions are obtained by using the method of characteristics. The saturation distribution in the fractured system and the matrix system as well as the formula of breakthrough time are presented. These results provide a theoretical basis and a computing method for efficient production of oil from naturally fractrued reservoirs under bottom water drive.