在多孔介质中通过形成液滴提高表面活性剂灌注的油层流动性

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Transport in Porous Media Pub Date : 2024-01-24 DOI:10.1007/s11242-023-02050-z
B. Haney, T. Cochard, A. Julien, J. Wu, R. Davis, L. Xiao, D. A. Weitz, Y.-Q. Song
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引用次数: 0

摘要

我们使用一种由规则间隔的方形柱子组成的二维阵列构成的微流体装置,研究了在表面活性剂淹没的情况下,最初被困的大油团形成油滴的情况。我们观察到,当油流动的毛细管数超过临界值时,油块破裂会形成横跨多个孔隙的被困斑块或大量移动油滴,这些油滴以与淹没流体平均速度相当的速度流出装置。不过,这些移动液滴只有在超过二级毛细管数量阈值时才能观察到。我们发现,这些液滴的形成涉及三种不同的被动液滴生成机制,即液滴在垂直流体的牵引下形成、在同轴流体的牵引下形成、或在与柱子碰撞而分裂时形成。我们的研究结果表明,只有当油液以移动液滴的形式存在时,才会发生油液突破,这表明液滴的形成可能是残留油液在多孔介质中流动的一个重要条件。此外,这种后阵列微流体装置还可用于生产单分散液滴,其大小可通过柱子间距来控制。
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Oil Ganglia Mobility Enhancement by Droplet Formation for Surfactant Flooding in Porous Media

We study the formation of oil droplets from an initially trapped large oil ganglion under surfactant flooding, using a microfluidic device consisting of a two-dimensional array of regularly spaced square posts. We observe that above a critical capillary number for oil mobilization, breakage of the ganglion results in the formation of either trapped patches spanning multiple pores or numerous mobile droplets that exit the device at a velocity comparable to the average flooding fluid velocity. These mobile droplets, however, are only observed when above a secondary capillary number threshold. The formation of these droplets is found to involve the simultaneous occurrence of three different passive droplet generation mechanisms where a droplet is formed as it is pulled by perpendicular fluid flow, as it is pulled by co-axial fluid flow, and or as it splits due to collision with a post. Our results show that oil breakthroughs only occur when the oil is in the form of mobile droplets, suggesting that droplet formation can be an important condition for the mobility of residual oil in porous media. Additionally, this post-array microfluidic device can be used for the production of monodisperse droplets whose size can be controlled by the spacing of the posts.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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