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Evaluation of ScCO2-water performance on bituminous coal : insights from experiments and 3D CT image reconstruction
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Luo, Peng, Zhang, Zhenyu, Geng, Xueyu, Xue, Kangsheng and Guang, Wenfeng (2022) Evaluation of ScCO2-water performance on bituminous coal : insights from experiments and 3D CT image reconstruction. Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 8 (4). 118. doi:10.1007/s40948-022-00420-3 ISSN 2363-8419.
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Official URL: http://dx.doi.org/10.1007/s40948-022-00420-3
Abstract
Evaluating the coupling of moisture content with supercritical CO2 (ScCO2) in coal is important for CO2 geological sequestration and enhanced coalbed methane recovery. Changes of minerals and microstructure in bituminous coal after ScCO2-water treatment were explored employing X-ray powder diffraction and micro-computed tomography (CT), and the seepage behavior evolution was further investigated by performing computational fluid dynamic analysis after 3D CT reconstruction. The results show that carbonate minerals dissolved remarkably after ScCO2-water treatment, but a reversible chemical reaction occurred in calcite minerals. The induced mineral dissolution, pore-fracture formation and expansion changed the pore-fracture structure in coal significantly. As a result, the amount and diameter of pores and throats obviously increased as the total volume and surface area of the pore-fracture increased to be nearly twice of the original coal. Additionally, the pore-fracture connectivity improved from 44.7 to 67.6% with a coordination number greater than 3 after ScCO2-water treatment. Pores of the equivalent radius of 75 μm were also found to contribute most to the permeability, rather than pores of the largest equivalent radius, as reported previously, indicating both the size and volume proportion of pores should be considered in permeability evaluation. Numerical modeling reveals that pore pressure decays faster along flow pathways after ScCO2-water treatment due to pore-fracture volume enhancement. The ScCO2-water treatment not only increased seepage channels in coal but also intensified the preferential flow. Along with the pore-fracture volume enhancement, the permeability heterogeneity in coal decreased after the ScCO2-water treatment, but the permeability enhancement along different directions varied.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
Journal or Publication Title: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources | ||||||
Publisher: | Springer | ||||||
ISSN: | 2363-8419 | ||||||
Official Date: | 12 June 2022 | ||||||
Dates: |
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Volume: | 8 | ||||||
Number: | 4 | ||||||
Article Number: | 118 | ||||||
DOI: | 10.1007/s40948-022-00420-3 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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