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arXiv 2211.03356physics.flu-dynphysics.geo-ph
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Channeling:一类新的复杂多孔介质中的溶解

Channeling: a new class of dissolution in complex porous media

Hannah P. Menke, Julien Maes, Sebastian Geiger

摘要:

目前多孔介质中矿物溶解的概念模型包括三种溶解模式(虫孔、致密和均匀)-或区域-其发展取决于流动、扩散和反应速率的相对优势。在这里,我们研究了在酸注入过程中的孔隙结构的演变,使用数值模拟两个多孔介质结构的日益复杂。我们研究制度和despite之间的边界的存在,第四个制度称为通道,已经存在的快速流动的途径优先扩大溶解。在孔喉尺寸的分布导致不同流动路径的流速存在数量级差异的情况下,会发生堵塞。这种仅沿主要流动路径的溶解集中引起渗透率的立即、大的变化,而孔隙度的变化相对较小,导致孔隙度-渗透率关系不同于先前所见的任何关系。这项工作表明,我们目前的溶解制度的概念模型必须修改,包括沟道溶解的应用,如地质碳储存和地热能生产的准确预测。

英文摘要:

The current conceptual model of mineral dissolution in porous media is comprised of three dissolution patterns (wormhole, compact, and uniform) - or regimes - that develop depending on the relative dominance of flow, diffusion, and reaction rate. Here, we examine the evolution of pore structure during acid injection using numerical simulations on two porous media structures of increasing complexity. We examine the boundaries between regimes and characterise the existence of a fourth regime called channeling, where already existing fast flow pathways are preferentially widened by dissolution. Channeling occurs in cases where the distribution in pore throat size results in orders of magnitude differences in flow rate for different flow pathways. This focusing of dissolution along only dominant flow paths induces an immediate, large change in permeability with a comparatively small change in porosity, resulting in a porosity-permeability relationship unlike any that has been previously seen. This work demonstrates that our current conceptual model of dissolution regimes must be modified to include channeling for accurate predictions of dissolution in applications such as geologic carbon storage and geothermal energy production.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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