不同出口及注入速度下微观水驱数值模拟研究

Numerical simulation of micro-water drive under different outlet and injection rates

油水两相在孔隙介质内的流动行为对于揭示油水运动的动力学机制具有重要意义。本文针对岩石微观孔隙,数值模拟探索不同出口及注入速度下的油水两相流动行为。发现:不同出口的设置采收率在27.7%~41.3%,多点出口的采收率为47.9%,明显高于单一出口下的采收率;随着注入速度由0.0005 m/s增大到0.0160 m/s,采收率先增大后减小,存在最适注入速度(0.0080 m/s)能够得到最大采收率,此外剩余油赋存类型发生明显变化。本研究从微观尺度入手,揭示微观孔隙结构内油水流动机制,对开采策略调整及提高原油采收率具有重要意义。

The flow behavior of oil and water in porous media is of great significance to reveal the dynamic mechanism of oil and water movement.In this paper,based on the micro-pore of rock,the oil-water two-phase flow behavior under different outlet and injection rates is explored by numerical simulation.It is found that the set recovery of different outlets is in the range of 27.7%~41.3%,and the recovery of multi-point outlets is 47.9%,which is significantly higher than that of single outlet.With the injection rate increasing from 0.0005 m/s to 0.0160 m/s,recovery first increases and then decreases.There is an optimal injection rate(0.0080 m/s)that can achieve maximum recovery.In addition,the occurrence type of remaining oil changes significantly.This study,starting from the microscopic scale,reveals the mechanism of oil and water flow in the microscopic pore structure,which is of great significance to the adjustment of production strategy and the improvement of oil recovery.