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Foam for Mobility Control in EOR - a Microfluidic Approach

机译：EOR中移动性控制的泡沫 - 微流体方法

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Foam injection is one of the processes that may be used for enhanced oil recovery, in particular for gas mobility control. The work we present is focussed on understanding foam formation and foam flow at small scale in very simple model geometries. To this purpose, a microfluidic device is used to accurately control diphasic flows confined at 10 to 100 micrometer scale. The microfluidic device is made of polydimethylsiloxane (PDMS), a transparent elastomer allowing simple and fast prototyping and easy observation of flows with optical microscopy. The experimental method is based on a microsystem that first permits formation of a dispersion of very monodisperse gas bubbles in water and surfactant at a flow-focusing geometry. The flow and the behaviour of the bubbles downstream is as well observed and measured in the model geometries including chamber, channels, etc. Complete phase diagram of the foam formed is shown, from very wet to very dry (small or high gas volume fraction) and with small or large bubbles according to pressures applied of both the gas and the aqueous phase. Image analysis is used to characterize the foam structure (quality, bubble size, bubble monodispersity). A simple analysis is done to give a criterion for the foam to be formed according to geometry, surface tension and pressures applied to the fluids. First results show that in a geometry modelling two permeabilities with simple large and small channels, fluid flow may be redirected from high permeabilities areas to small permeabilities ones Even if obtained without any oil, this observation may be compared to what happen to foam flows in fractured rocks and may explain part of the complex phenomena involved for increase oil recovery. To conclude, microfluidic tool appears as an interesting technique to characterize the behaviour of foam at the micrometric scale.
机译：泡沫注射是可用于增强的采油，特别是用于气体迁移率控制的方法之一。我们呈现的工作主要集中在非常简单的模型几何形状中以小规模的小规模理解泡沫形成和泡沫流动。为此目的，使用微流体装置来精确控制限制为10到100微米刻度的双色流量。微流体装置由聚二甲基硅氧烷（PDMS）制成，透明弹性体允许简单且快速的原型，并且易于观察光学显微镜的流动。实验方法基于微系统，首先在流动聚焦几何形状下形成水和表面活性剂中非常单分散气泡的分散。流和的行为气泡下游以及观察和模型中的几何形状，包括腔室，通道，等等形成的泡沫的完全相图测量被示出，从非常润湿到非常干燥（小的或高的气体体积分数）并且根据施加气相和水相的压力，具有小或大的气泡。图像分析用于表征泡沫结构（质量，泡沫尺寸，泡沫单分散性）。完成简单的分析以给出根据几何形状，表面张力和施加到流体的压力形成的泡沫的标准。第一个结果表明，在几何结构模型中，具有简单的大型和小通道的两个渗透性，即使在没有任何油的情况下获得的，可以将流体流从高渗透区域重定向到小的渗透率，并且可以将该观察与泡沫流动在裂缝中的泡沫流动进行比较岩石和可以解释涉及增加石油回收的复杂现象的一部分。为了得出结论，微流体工具作为一种有趣的技术，以表征泡沫在微米级的行为。

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