Investigation of effects of surface roughness on coal seam gas transport using a fractal-based lattice Boltzmann method

Xu Yu; Klaus Regenauer-Lieb; Fangbao Tian

doi:10.1080/22020586.2019.12073014

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Investigation of effects of surface roughness on coal seam gas transport using a fractal-based lattice Boltzmann method
Authors Xu Yu^a, Klaus Regenauer-Lieb^b and Fangbao Tian^c
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^a UNSW Sydney Minerals and Energy Resources Engineering, , Sydney, , NSW, 2052, Australia, [email protected] ^b UNSW Sydney Minerals and Energy Resources Engineering, Sydney, , NSW, 2052, Australia, [email protected] ^c UNSW Canberra Engineering and Information Technology, Canberra, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 2
DOI: https://doi.org/10.1080/22020586.2019.12073014
- Published online: 01 Dec 2019

Abstract

Summary

Understanding of gas flow through cleats in coal seams is important for many applications from gas content estimation, production rate assessment and well abandonment. Direct observations of the kinetic process of gas diffusion and adsorption in the cleat-matrix structure through experimental studies are difficult to perform. Therefore, robust numerical simulations are needed for investigations. We present a fundamental study of the microscopic mechanism of gas migration by a numerical model of coal seam gas diffusion and adsorption considering effects of surface roughness to study the effects of rough surfaces on the methane transport.

We found that surface roughness has a significant effect on gas transport by considering fractal dimension ranging from 1.5 to 1.8. Increases of surface roughness enlarge the gas-solid contact area causing higher adsorption capacities which decrease the concentration of gas breakthrough. Results of this work can provide an improved understanding of the effect of microscopic mechanisms of methane migration in coal on the overall reservoir scale.

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References

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/content/journals/10.1080/22020586.2019.12073014

Article Type: Research Article

Keyword(s): Coal seam gas; diffusion and adsorption; fractal dimension; lattice Boltzmann method

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oa Investigation of effects of surface roughness on coal seam gas transport using a fractal-based lattice Boltzmann method

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