Fluid-solid coupling dynamic equations considering gas desorption con-traction and coal motion deformations

Xu, Peicheng; Tie, Y. C.; Wang, X.M.

doi:10.5755/j01.mech.23.3.18480

Cited by 3 publications

(1 citation statement)

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“…According to the basic assumptions, the seepage of CH 4 and CO 2 in coal follows Darcy's law based on the analysis of the mass conservation equation (Eq. 2;Xu et al 2017;Li et al 2016;Zhong et al 2016;Le et al 2017).…”

Section: Mass Conservation Equation Of Gas Seepage Motionmentioning

confidence: 99%

Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection

2019

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The technology used to enhance coalbed methane (CBM) recovery by injecting CO 2 (CO 2-ECBM) with heat, combining heat injection with CO 2 injection, is still in its infancy; therefore, theoretical studies of this CO 2-ECBM technology should be perused. First, the coupling equations of the diffusion-adsorption-seepage-heat transfer fields of gas are established. The displacement processes under different pressures and temperatures are simulated by COMSOL. Finally, the displacement effects, a comparison of the CO 2 storage capacity with the CH 4 output and the effective influencing radius of CO 2 injection are analyzed and discussed. The results show that (1) the displacement pressure and temperature are two key factors influencing the CH 4 output and the CO 2 storage capacity, and the increase in the CO 2 storage capacity is more sensitive to temperature and pressure than the CH 4 output. (2) The gas flow direction is from the injection hole to the discharge hole during the displacement process, and the regions with high velocity are concentrated at the injection hole and the discharge hole. (3) A reduction in the CH 4 concentration and an increase in the CO 2 concentration are obvious during the displacement process. (4) The effective influencing radius of injecting CO 2 with heat increases with the increase in time and pressure. The relationship between the effective influencing radius and the injection time of CO 2 has a power exponential function, and there is a linear relationship between the functional coefficient and the injection pressure of CO 2. This numerical simulation study on enhancing CBM recovery by injecting CO 2 with heat can further promote the implementation of CO 2-ECBM project in deep coal seams.

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Section: Mass Conservation Equation Of Gas Seepage Motionmentioning

confidence: 99%