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首页> 外文期刊>Advances in Water Resources >Direct simulations of two-phase flow on micro-CT images of porous media and upscaling of pore-scale forces
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Direct simulations of two-phase flow on micro-CT images of porous media and upscaling of pore-scale forces

机译：在多孔介质的微CT图像上两相流的直接模拟和孔尺度力的放大

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摘要

Pore-scale forces have a significant effect on the macroscopic behaviour of multiphase flow through porous media. This paper studies the effect of these forces using a new volume-of-fluid based finite volume method developed for simulating two-phase flow directly on micro-CT images of porous media. An analytical analysis of the relationship between the pore-scale forces and the Darcy-scale pressure drops is presented. We use this analysis to propose unambiguous definitions of Darcy-scale viscous pressure drops as the rate of energy dissipation per unit flow rate of each phase, and then use them to obtain the relative permeability curves. We show that this definition is consistent with conventional laboratory/ field measurements by comparing our predictions with experimental relative permeability. We present single and two-phase flow simulations for primary oil injection followed by water injection on a sand- pack and a Berea sandstone. The two-phase flow simulations are presented at different capillary numbers which cover the transition from capillary fingering at low capillary numbers to a more viscous fingering displacement pattern at higher capillary numbers, and the effect of capillary number on the relative permeability curves is investigated. Overall, this paper presents a new finite volume-based methodology for the detailed analysis of two-phase flow directly on micro-CT images of porous media and upscaling of the results to the Darcy scale.
机译：孔尺度力对通过多孔介质的多相流的宏观行为具有重大影响。本文使用一种新的基于流体体积的有限体积方法来研究这些力的影响，该方法用于直接在多孔介质的微CT图像上模拟两相流。给出了孔隙尺度力与达西尺度压降之间关系的分析分析。我们使用此分析提出达西规模的粘性压降作为每个相每单位流速的能量耗散率的明确定义，然后使用它们来获得相对渗透率曲线。通过将我们的预测结果与实验相对渗透率进行比较，我们表明该定义与常规实验室/现场测量结果一致。我们介绍了单相和两相流动模拟，分别进行一次注油和随后在沙包和Berea砂岩上注水。在不同的毛细管数下进行了两相流模拟，涵盖了从低毛细管数的毛细管指法到较高毛细管数的粘性指法位移模式的过渡，并研究了毛细管数对相对渗透率曲线的影响。总体而言，本文提出了一种基于有限体积的新方法，可直接在多孔介质的微CT图像上进行两相流的详细分析，并将结果放大至达西尺度。

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