In this study, we analyze experimentally the immiscible displacement of an oil phase from a porous medium. A 2D pore network etched in resin was considered as a random porous medium. This micromodel is made with a transparent material to allow direct visualization of the drainage process. In all experiments, the porous model is initially saturated with an oil-phase, which is displaced by an air phase. Air is injected continuously at a constant flow rate in a centre point of the micromodel. In this paper, we present an experimental characterization of the evolution of the gas cluster after the first breakthrough. We discuss the dependence of the phase distributions on viscous forces, capillary forces and flow rate injection. We have noticed that for low air rates injection, the main gas cluster is detached and connected at the permeable edge. The detachment and the connection durations are periodic and depend on fluids properties.

中文翻译：

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首次突破后在多孔介质中的相分布

在这项研究中，我们通过实验分析了油相从多孔介质中的不混溶驱替。在树脂中蚀刻的二维孔网络被认为是随机多孔介质。该微模型由透明材料制成，可以直接观察排水过程。在所有实验中，多孔模型最初都被油相饱和，并被空气驱替。在微模型的中心点以恒定的流速连续注入空气。在本文中，我们提出了第一个突破后天然气团簇演化的实验表征。我们讨论了相分布对粘性力，毛细力和流速注入的依赖性。我们已经注意到，对于低空速注入，主要气体团簇被分离并连接在可渗透的边缘。