Abstract In the present work, high-speed imaging experiments are performed to measure the time-evolution of two-phase oil-water flow, water-saturation, oil ganglia number and size distribution in a pseudo-3D porous medium. The corresponding pore-resolved simulations are performed using the Volume-of-Fluid (VOF) method and predictions are validated using the aforementioned measurements. The experimentally-validated VOF model is used to understand the effects of water-flooding velocity and interfacial tension [i.e. Capillary number (Ca)] on the pore-scale oil recovery mechanisms. The pore-resolved VOF simulations reveal that the drainage phenomenon is dominated by Haines-jump events at low Ca values. The increase in Ca values results in the decrease in the frequency of Haines-jump events and after the transitional Ca, the drainage phenomenon is no longer governed by Haines-jump events and is governed by viscous fingering. Finally, VOF simulations are used to analyze the effect of successive step changes in the interfacial tension on the oil recovery.

中文翻译：

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伪 3D 多孔介质中的孔隙分辨两相流：测量和流体体积模拟

摘要 在目前的工作中，进行了高速成像实验，以测量伪三维多孔介质中油水两相流、水饱和度、油节数和尺寸分布的时间演化。使用流体体积 (VOF) 方法执行相应的孔隙解析模拟，并使用上述测量验证预测。实验验证的 VOF 模型用于了解水驱速度和界面张力 [即毛细管数 (Ca)] 对孔隙尺度采油机制的影响。孔隙解析的 VOF 模拟表明，排水现象主要是在低 Ca 值下的海恩斯跳跃事件。Ca 值的增加导致海恩斯跳跃事件的频率降低，在过渡 Ca 之后，排水现象不再受海恩斯跳跃事件的支配，而是受粘性指法支配。最后，VOF 模拟用于分析界面张力的连续阶跃变化对石油采收率的影响。