底水驱动油藏水平井见水以后含水率变化规律研究

STUDY FOR WATER CUT VARIATION OF HORIZONTAL WELL AFTER BREAKTHROUGH IN A RESERVOIR WITH BOTTOM

目前底水驱动油藏水平井见水以后含水率变化规律的研究主要是用数值模拟的方法，但数模需花费大量机时、费用和大力。本文提出了利用二相渗流近似计算的方法和虚拟前缘的方法来确定水平井见水后的含水率。应用这两种方法进行实例计算，其结果与数模结果比较接近。

The current situation which determines the water cut in horizontal wells after breakthrough is that reservoir engineers adopt numerical simulation methods. But it costs too much money,computer time and man-hours. The paper puts forward two methods to determine water cut after breakthrough. On the basis of reference [9], the first is an approximate method of two phase flow. The second method is virtual frontal method. Finally, the paper carries out example calculation by use of the two methods, and the results are compared with numerical simulation results. They are very close to each other.