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

Abstract The technology used to enhance coalbed methane (CBM) recovery by injecting CO2 (CO2-ECBM) with heat, combining heat injection with CO2 injection, is still in its infancy; therefore, theoretical studies of this CO2-ECBM technology should be perused. First, the coupling equations of the diffu...

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Autores principales:	Hui-Huang Fang, Shu-Xun Sang, Shi-Qi Liu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	CO2-ECBM Numerical simulation Displacement effect COMSOL CO2 storage capacity Effective influencing radius Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/5e668a0469534305968a5945c8e16f04
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spelling	oai:doaj.org-article:5e668a0469534305968a5945c8e16f042021-12-02T08:29:35ZNumerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection10.1007/s12182-018-0291-51672-51071995-8226https://doaj.org/article/5e668a0469534305968a5945c8e16f042019-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0291-5https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The technology used to enhance coalbed methane (CBM) recovery by injecting CO2 (CO2-ECBM) with heat, combining heat injection with CO2 injection, is still in its infancy; therefore, theoretical studies of this CO2-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 CO2 storage capacity with the CH4 output and the effective influencing radius of CO2 injection are analyzed and discussed. The results show that (1) the displacement pressure and temperature are two key factors influencing the CH4 output and the CO2 storage capacity, and the increase in the CO2 storage capacity is more sensitive to temperature and pressure than the CH4 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 CH4 concentration and an increase in the CO2 concentration are obvious during the displacement process. (4) The effective influencing radius of injecting CO2 with heat increases with the increase in time and pressure. The relationship between the effective influencing radius and the injection time of CO2 has a power exponential function, and there is a linear relationship between the functional coefficient and the injection pressure of CO2. This numerical simulation study on enhancing CBM recovery by injecting CO2 with heat can further promote the implementation of CO2-ECBM project in deep coal seams.Hui-Huang FangShu-Xun SangShi-Qi LiuKeAi Communications Co., Ltd.articleCO2-ECBMNumerical simulationDisplacement effectCOMSOLCO2 storage capacityEffective influencing radiusScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 1, Pp 32-43 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	CO2-ECBM Numerical simulation Displacement effect COMSOL CO2 storage capacity Effective influencing radius Science Q Petrology QE420-499
spellingShingle	CO2-ECBM Numerical simulation Displacement effect COMSOL CO2 storage capacity Effective influencing radius Science Q Petrology QE420-499 Hui-Huang Fang Shu-Xun Sang Shi-Qi Liu Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
description	Abstract The technology used to enhance coalbed methane (CBM) recovery by injecting CO2 (CO2-ECBM) with heat, combining heat injection with CO2 injection, is still in its infancy; therefore, theoretical studies of this CO2-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 CO2 storage capacity with the CH4 output and the effective influencing radius of CO2 injection are analyzed and discussed. The results show that (1) the displacement pressure and temperature are two key factors influencing the CH4 output and the CO2 storage capacity, and the increase in the CO2 storage capacity is more sensitive to temperature and pressure than the CH4 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 CH4 concentration and an increase in the CO2 concentration are obvious during the displacement process. (4) The effective influencing radius of injecting CO2 with heat increases with the increase in time and pressure. The relationship between the effective influencing radius and the injection time of CO2 has a power exponential function, and there is a linear relationship between the functional coefficient and the injection pressure of CO2. This numerical simulation study on enhancing CBM recovery by injecting CO2 with heat can further promote the implementation of CO2-ECBM project in deep coal seams.
format	article
author	Hui-Huang Fang Shu-Xun Sang Shi-Qi Liu
author_facet	Hui-Huang Fang Shu-Xun Sang Shi-Qi Liu
author_sort	Hui-Huang Fang
title	Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
title_short	Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
title_full	Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
title_fullStr	Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
title_full_unstemmed	Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection
title_sort	numerical simulation of enhancing coalbed methane recovery by injecting co2 with heat injection
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/5e668a0469534305968a5945c8e16f04
work_keys_str_mv	AT huihuangfang numericalsimulationofenhancingcoalbedmethanerecoverybyinjectingco2withheatinjection AT shuxunsang numericalsimulationofenhancingcoalbedmethanerecoverybyinjectingco2withheatinjection AT shiqiliu numericalsimulationofenhancingcoalbedmethanerecoverybyinjectingco2withheatinjection
_version_	1718398487589027840

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

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