砾岩多孔介质中的非达西流动特性实验研究

IF 2.3 4区 地球科学
Tong Zhang, Jun Wu, Yongnan Li, Ruilong Li, Ming Tang, Junlin Mao
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引用次数: 0

摘要

地质中的流动机制对地下活动至关重要。为了更好地了解孔隙尺寸分布和孔隙结构演变对多孔介质水力特性的影响,本研究进行了多种粒度范围内的轴向渗流试验。定量分析了孔径分布和演变对流态转换的影响。通过改变均匀系数 (Cu) (4 < Cu < 24) 和曲率系数 (Cc) (0.2 < Cc < 14) 来控制孔径分布。结果表明,系数大小似乎与颗粒材料的渗透性呈正相关,但不能影响主要由孔隙结构的异质性主导的流态转换。与孔隙空间和介质效应相比,孔隙结构的异质性对预达西流动的发生有显著影响,并与惯性力或流体速度的大小直接相关。研究表明,曲率系数(Cc)是流动转变过程中的一个重要特征参数。粒径比 \(\left( {\frac{{d_{60} }}{{d_{30} }} \right)\)可作为评估非达西流动特性的参考特征粒径之一。在轴向应力作用下,前达西流向后达西流过渡的临界水力梯度减小,甚至前达西流消失。这些发现将有助于识别地下水中的非达西流动转变,并促进对地下采掘条件下流体非线性演化行为的更好理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental study on non-Darcy flow characteristics in conglomerate porous medium

Experimental study on non-Darcy flow characteristics in conglomerate porous medium

The flow regime in geology is critical to the underground activity. In this study, axial seepage tests within a wide range of grain sizes were conducted to better understand the influence of pore size distribution and pore structure evolution on hydraulic characteristics in porous media. The effect of pore size distribution and evolution on flow regime transition was quantitatively analyzed. The pore size distribution was controlled by varying uniformity coefficient (Cu) (4 < Cu < 24) and curvature coefficient (Cc) (0.2 < Cc < 14). The results show that coefficient size appears to have a positive correlation with the permeability of the granular materials, but cannot impact the transition of flow regime that is mainly dominated by the heterogeneity of the pore structure. Compared to the pore space and the effect of medium, the heterogeneity of pore structure significantly impacts on the occurrence of pre-Darcy flow and directly correlates with the magnitude of inertial forces or fluid velocity. It demonstrates that the curvature coefficient (Cc) is an important characteristic parameter in flow transition. The particle size ratio \(\left( {\frac{{d_{60} }}{{d_{30} }}} \right)\) could be considered as one of the reference characteristic particle sizes for assessing non-Darcy flow characteristics. Subjected to the axial stress, the critical hydraulic gradient for the transition from pre-Darcy to post-Darcy flow was reduced, and even the pre-Darcy flow disappeared. These findings will contribute to the identification of non-Darcy flow transition in groundwater and promote a better understanding of the nonlinear evolution behavior of fluids under underground extraction conditions.

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来源期刊
Acta Geophysica
Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.80
自引率
13.00%
发文量
251
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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