Numerical Simulation of CO 2 -ECBM Based on Multi-Physical Field Coupling Model

Ziwen Li, Hongjin Yu () and Yansong Bai
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Ziwen Li: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Hongjin Yu: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yansong Bai: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2022, vol. 14, issue 18, 1-15

Abstract: In this paper, heat injection and CO 2 injection are combined, and the influence of coal seam parameters on CO 2 -ECBM is analyzed to improve the production of CH 4 and CO 2 reserves and the effective control of both greenhouse gases. A multi-physical field coupling model of CO 2 -ECBM was established based on Darcy’s law, Fick’s law of diffusion, the extended Langmuir model for adsorption, and the equation of state. Numerical simulation of CO 2 -ECBM under different coal seam parameters was carried out by COMSOL Multiphysics. The results show that increasing the injection pressure of the CO 2 injection well and the initial pressure of the coal seam can effectively increase the gas pressure and concentration gradient, which has a positive effect on improving the extraction concentration of CH 4 and the sequestration concentration of CO 2 in the coal seam. The increase of the initial temperature of the coal seam will promote the desorption and diffusion of the binary elemental gas, resulting in a decrease in the concentration of coalbed methane and a decrease in the displacement effect. In the process of displacement, the greater the initial permeability, the greater the fracture opening of the coal seam, which is more conducive to the seepage transport of the gas. The closer to the position of the injection well, the better the displacement effect and the lower the permeability rate ratio.

Keywords: CO 2 -ECBM; multi-physical field coupling; CO 2 and CH 4 concentration; permeability; displacement effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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