Capillary and viscous fracturing during drainage in porous media
Capillary and viscous fracturing during drainage in porous media
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DOI：
10.1103/physreve.103.063106
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发表时间：
2021-06-15
影响因子：
2.4
通讯作者：
Bourg, Ian C.
中科院分区：
文献类型：
--
作者：
Carrillo, Francisco J.;Bourg, Ian C.
详细了解多孔介质中流体流动和固体变形之间的耦合关系，对于开发与广泛的地质和生物过程有关的新技术至关重要。从这些联结中出现的一个特别具有挑战性的现象是在多相流过程中从流体侵入到压裂的转变。以前的研究表明，这种转变对流体流速、毛细管和多孔介质的结构特性高度敏感。然而，相关的流体流动和材料破坏状态的全面描述并不存在。在这里，我们使用我们新开发的多相Darcy-Brinkman-Biot框架来研究在广泛的流动、润湿性和固体流变学条件下，软多孔介质中粘性稳定多相流动过程中从排水到材料破坏的转变。我们证明了由无量纲数控制的三种不同的材料破坏模式的存在，这些模式量化了多孔介质中粘性力、毛细力和结构力的平衡，这与先前的实验和颗粒模拟相一致。据我们所知，这项研究是第一次有效地分离粘性力和毛细管力对压裂力学的影响。最后，我们考察了固结或压实对所述维数和系统破裂倾向的影响。
Detailed understanding of the couplings between fluid flow and solid deformation in porous media is crucial for the development of novel technologies relating to a wide range of geological and biological processes. A particularly challenging phenomenon that emerges from these couplings is the transition from fluid invasion to fracturing during multiphase flow. Previous studies have shown that this transition is highly sensitive to fluid flow rate, capillarity, and the structural properties of the porous medium. However, a comprehensive characterization of the relevant fluid flow and material failure regimes does not exist. Here, we used our newly developed multiphase Darcy-Brinkman-Biot framework to examine the transition from drainage to material failure during viscously stable multiphase flow in soft porous media in a broad range of flow, wettability, and solid rheology conditions. We demonstrate the existence of three distinct material failure regimes controlled by nondimensional numbers that quantify the balance of viscous, capillary, and structural forces in the porous medium, in agreement with previous experiments and granular simulations. To the best of our knowledge, this study is the first to effectively decouple the effects of viscous and capillary forces on fracturing mechanics. Last, we examine the effects of consolidation or compaction on said dimensional numbers and the system's propensity to fracture.