Numerical analysis of matrix swelling and its effect on microstructure of digital coal and its associated permeability during CO_(2)-ECBM process based on X-ray CT data

Hui-Huang Fang; Zhang-Fei Wang; Shu-Xun Sang; Yan-Hui Huang

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Numerical analysis of matrix swelling and its effect on microstructure of digital coal and its associated permeability during CO_(2)-ECBM process based on X-ray CT data

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Matrix swelling effect will cause the change of microstructure of coal reservoir and its permeability,which is the key factor affecting the engineering effect of CO2-ECBM technology.The Sihe and Yuwu collieries are taken as research objects.Firstly,visualization reconstruction of coal reservoir is realized.Secondly,the evolution of the pore/fracture structures under different swelling contents is discussed.Then,the influence of matrix phase with different swelling contents on permeability is discussed.Finally,the mechanism of swelling effect during the CO2-ECBM process is further discussed.The results show that the intra-matrix pores and matrix-edge fractures are the focus of this study,and the contacting area between matrix and pore/fracture is the core area of matrix swelling.The number of matrix particles decreases with the increase of size,and the distribution of which is isolated with small size and interconnected with large size.The swelling effect of matrix particles with larger size has a great influence on the pore/fracture structures.The number of connected pores/fractures is limited and only interconnected in a certain direction.With the increase of matrix swelling content,the number,porosity,width,fractal dimension,surface area and volume of pores/fractures decrease,and their negative contribution to absolute permeability increases from 0.368% to 0.633% and 0.868%-1.404%,respectively.With the increase of swelling content,the number of intra-matrix pores gradually decreases and the pore radius becomes shorter during the CO2-ECBM process.The matrix continuously expands to the connected fractures,and the width of connected fractures gradually shorten.Under the influence of matrix swelling,the bending degree of fluid flow increases gradually,so the resistance of fluid migration increases and the permeability gradually decreases.This study shows that the matrix swelling effect is the key factor affecting CBM recovery,and the application of this effect in CO_(2)-ECBM process can be discussed.

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《石油科学：英文版》 |2023年第1期|87-101|共15页
作者
Hui-Huang Fang; Zhang-Fei Wang; Shu-Xun Sang; Yan-Hui Huang;
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作者单位

School of Earth and Environment University of Science and Technology;

Institute of Energy Comprehensive National Science Center;

Low Carbon Energy Institute University of Mining and Technology;

School of Resources and Geosciences University of Mining and Technology;

Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization University of Mining and Technology;

State Key Laboratory of Petroleum Resources and Prospecting University of Petroleum;

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原文格式 PDF
正文语种 chi
中图分类金属学与热处理;
关键词
Matrix swelling; CO2-ECBM; Absolutely permeability; Numerical analysis; X-ray CT; Qinshui Basin;

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1. Direct Evidence of Coal Swelling and Shrinkage with Injecting CO_(2) and N_(2) Using in-situ Synchrotron X-ray Microtomography [J] . Guanglei Zhang ,P.G.Ranjith ,Herbert E.Huppert . 工程(英文) . 2022,第11期

Numerical analysis of matrix swelling and its effect on microstructure of digital coal and its associated permeability during CO_(2)-ECBM process based on X-ray CT data

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