Methane diffusion in coal matrix considering heterogeneity of micromechanical properties by nanoindentation

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Yidong Cai , Ding Jia , Dameng Liu , Ranjith Pathegama Gamage , Qian Li , Yingfang Zhou , Zhentao Li
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引用次数: 0

Abstract

The coal matrix exhibits significant heterogeneity at the micro-scale. In this study, a heterogeneous mechanical model of coal matrix from different coal ranks was constructed by using nanoindentation. Additionally, a fluid-solid coupling model was developed to consider matrix shrinkage and stress sensitivity, enabling the incorporation of porosity changes during methane diffusion. The methane concentration and matrix deformation characteristics in the simulation area at different times was obtained. The effects of matrix shrinkage and stress sensitivity on porosity changes and matrix deformation were compared. And the deformation of the matrix under different micromechanical properties was compared. The findings indicate that the nanoindentation method effectively characterizes the micromechanical heterogeneity of coal matrices. Furthermore, during the diffusion process, we observed an initial increase followed by a decrease in matrix deformation, with matrix shrinkage leading to more pronounced deformation. Notably, harder coal matrices exhibited reduced deformation. This study enhances the understanding of the dynamic changes in the matrix during coalbed methane extraction.

通过纳米压痕法研究煤基质中甲烷扩散的微机械特性异质性
煤基质在微观尺度上表现出明显的异质性。本研究利用纳米压痕技术构建了不同煤级煤基质的异质力学模型。此外,还建立了一个流固耦合模型,以考虑基质收缩和应力敏感性,从而将甲烷扩散过程中的孔隙率变化纳入其中。研究获得了不同时间模拟区域的甲烷浓度和基质变形特征。比较了基质收缩和应力敏感性对孔隙度变化和基质变形的影响。并比较了不同微机械性能下基体的变形。研究结果表明,纳米压痕法能有效表征煤基质的微观力学异质性。此外,在扩散过程中,我们观察到基体变形先增加后减小,基体收缩导致更明显的变形。值得注意的是,较硬的煤基质的变形量减少。这项研究加深了人们对煤层气抽采过程中基质动态变化的理解。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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