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针对低渗透油藏孔隙尺度小、采收率低的问题,采用宽度为200μm、深度分别为1.8μm和4.1μm的两个矩形通道,结合数字显微摄像技术和微流体测试技术,对岩层孔隙流动进行了模拟,得到了孔隙通道中单相油以及含油率(体积分数)为10%～60%的油水两相流的流动特性.实验结果表明:对于深度为1.8μm和4.1μm的两个矩形通道,单相油流动的摩擦系数低于理论值,并与雷诺数呈线性关系;泊肃叶数小于理论预测值,通道尺度越小,泊肃叶数实验值与理论值的差异越大.油水两相流流动的摩擦系数与雷诺数也满足线性关系,在不同含油率时有的高于理论值,有的低于理论值;泊肃叶数总体随含油率增加而减小,在含油率为20%与60%时出现跳跃式增长,分析表明泊肃叶数随含油率变化是受壁面亲水性的影响.
Aiming at the problems of low porosity and low oil recovery in low permeability reservoirs, two rectangular channels with a width of 200 μm and a depth of 1.8 μm and 4.1 μm were used. Combined with digital microscopy and microfluidic testing techniques, Flow was simulated and the flow characteristics of oil-water two-phase flow with single-phase oil in the pore channel and oil content (volume fraction) of 10% -60% were obtained.The experimental results show that for two-phase flow of 1.8μm and 4.1μm The friction coefficient of rectangular channel and single-phase oil flow is lower than the theoretical value and linear with the Reynolds number. The number of Poiseuille leaves is less than the theoretical predicted value. The smaller the channel size, the larger the difference between experimental value and theoretical value . The friction coefficient and Reynolds number of oil-water two-phase flow also satisfy the linear relationship, and at different oil rates, some are higher than the theoretical value, and some are lower than the theoretical value. The number of Poiseuille leaves generally decreases with the increase of oil content. The leaching rate increased with the oil content of 20% and 60%. The analysis shows that the change of Poiseuille number with the oil content is influenced by the hydrophilicity of the wall.