3D reconstruction of coal pore network and its application in CO2-ECBM process simulation at laboratory scale

Huihuang Fang; Hongjie Xu; Shuxun SangShiqi LiuShuailiang SongHuihu Liu

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3D reconstruction of coal pore network and its application in CO2-ECBM process simulation at laboratory scale

机译：3D reconstruction of coal pore network and its application in CO2-ECBM process simulation at laboratory scale

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Abstract Three-dimensional (3D) reconstruction of the equivalent pore network model (PNM) using X-ray computed tomography (CT) data are of significance for studying the CO2-enhanced coalbed methane recovery (CO2-ECBM). The docking among X-ray CT technology, MATLAB, with COMSOL software not only can realize the 3D reconstruction of PNM, but also the CO2-ECBM process simulation. The results show that the Median filtering algorithm enabled the de-noising of the original 2D CT slices, the image segmentation of all slices was realized based on the selected threshold, and the PNM can be constructed based on the Maximum Sphere algorithm. The mathematical model of CO2-ECBM process fully coupled the expanded Langmuir equation. At the same time for CO2 injection, CH4 pressure tends to decrease with the increase of CO2 pressure, but its difference is not obvious. The CH4 pressure in the slice center changed a lot, while at the edge it changed a little under different CO2 pressures. The injected CO2 was transported to matrix along the macro and micro-fractures with continuous flow. The injected CO2 first replaced the adsorbed CH4 by covering the inner surface of macro-pores and meso-pores to form the single molecular layer adsorption of CO2. Then they migrated to micro-pores by Fick’s diffusion, sliding flow, and surface diffusion. Furthermore, the CO2 replaced CH4 adsorbed by volumetric filling in micro-pores, and formed the multi-molecular layer adsorption of CO2. The gas pressure and migration path between CO2 and CH4 are opposite. This study can provide a theoretical basis for studying digital rock physics technology and enrich the development of CO2-ECBM technology.

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来源
《Frontiers of earth science》 |2022年第2期|523-539|共17页
作者
Huihuang Fang; Hongjie Xu; Shuxun SangShiqi LiuShuailiang SongHuihu Liu;
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作者单位

Anhui University of Science and Technology||Anhui University of Science and Technology||Hefei Comprehensive National Science Center;

Hefei Comprehensive National Science Center||Anhui University of Science and Technology||Anhui University of Science and Technology;

China University of Mining and Technology||China University of Mining and TechnologyShandong Provincial Lunan Geo-engineering Exploration InstituteAnhui University of Science and Technology||Anhui University of Science and Technology;

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正文语种英语
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CO2-ECBM; 3D reconstruction; numerical simulation; X-ray CT; COMSOL; Qinshui Basin;

3D reconstruction of coal pore network and its application in CO2-ECBM process simulation at laboratory scale

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