Journal article

Discrete fracture matrix modelling of fully-coupled CO2 flow - Deformation processes in fractured coal

KHSM Sampath, MSA Perera, D Elsworth, SK Matthai, PG Ranjith, Dong-yin Li

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2021

Abstract

CO2 interaction causes complex mechanical deformations and flow modifications in coal, depending on the spatial disposition of the fracture-matrix system. Sorption-induced matrix swelling reduces the local fracture aperture and correspondingly the fracture permeability, consequently influencing gas flow throughout the seam. Since these modifications are highly -heterogeneous and -localized, an explicitly-represented geometric model is essential for the accurate modelling of the fully-coupled process. In this study, the CO2 flow – coal deformation process is implemented in a numerical model at the scale of coal constituents (i.e. matrix blocks and cleats), through the inclusion of a spatially..

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