A multi-scale model for CO<sub>2</sub> sequestration enhanced coalbed methane recovery

doi:10.1007/s11705-009-0138-0

Front Chem Eng Chin

2009, Vol. 3

Issue (1) : 20-25 https://doi.org/10.1007/s11705-009-0138-0

RESEARCH ARTICLE

A multi-scale model for CO₂ sequestration enhanced coalbed methane recovery

G. X. WANG¹(

), X. R. WEI¹, V. RUDOLPH¹, C. T. WEI², Y. QIN²

1. School of Engineering, University of Queensland, St Lucia Qld 4072, Australia; 2. School of Resources and Geoscience, China University of Mining & Technology, Xuzhou221008, China

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Abstract

This paper presents a multi-scale model to simulate the multicomponent gas diffusion and flow in bulk coals for CO₂ sequestration enhanced coalbed methane recovery. The model is developed based on a bi-dispersed structure model by assuming that coal consists of microporous micro-particles, meso/macro-pores and open microfractures. The bi-disperse diffusion theory and the Maxwell-Stefan approach were incorporated in the model, providing an improved simulation of the CH₄—CO₂/CH₄—N₂ counter diffusion dynamics. In the model, the counter diffusion process is numerically coupled with the flow of the mixture gases occurring within macro-pores or fractures in coal so as to account for the interaction between diffusion and flow in gas transport through coals. The model was validated by both experimental data from literature and our CO₂ flush tests, and shows an excellent agreement with the experiments. The results reveal that the gas diffusivities, in particular the micro-pore diffusivities are strongly concentration-dependent.

Keywords multi-scale model gas transport coal coalbed methane CO₂ sequestration

Corresponding Author(s): WANG G. X.,Email:gxwang@uq.edu.au

Issue Date: 05 March 2009

Cite this article:

G. X. WANG,X. R. WEI,V. RUDOLPH, et al. A multi-scale model for CO₂ sequestration enhanced coalbed methane recovery[J]. Front Chem Eng Chin, 2009, 3(1): 20-25.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0138-0
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I1/20

Fig.1 Illustrations of coal texture and gas transport in coal. (a) Cleats; (b) gas diffusion and flow

Fig.2 Scaling for gas transport in coal. (a) A cylindrical coal sample; (b) a bi-modal particle

Fig.3 Flowchart for simulation using “loose coupling” algorithm

Fig.4 Comparison of simulation results with literature data for CO core flush tests

Fig.5 Predicted results compared with experimental data for CO core flush tests

Fig.6 Simulation of CH recovery from coal with flue gas injection at various N—CO concentrations

Fig.7 Predicted effect of pressure and concentration on CH recovery

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