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Title: Coupled thermal–hydrological–mechanical modeling of CO 2 -enhanced coalbed methane recovery

Abstract

CO 2 -enhanced coalbed methane recovery, also known as CO 2 -ECBM, is a potential win-win approach for enhanced methane production while simultaneously sequestering injected anthropogenic CO 2 to decrease CO 2 emissions into the atmosphere. Here, CO 2 -ECBM is simulated using a coupled thermal–hydrological–mechanical (THM) numerical model that considers multiphase (gas and water) flow and solubility, multicomponent (CO 2 and CH 4 ) diffusion and adsorption, heat transfer and coal deformation. The coupled model is based on the TOUGH-FLAC simulator, which is applied here for the first time to model CO 2 -ECBM. The capacity of the simulator for modeling methane production is verified by a code-to-code comparison with the general-purpose finite-element solver COMSOL. Then, the TOUGH-FLAC simulator is applied in an isothermal simulation to study the variations in permeability evolution during a CO 2 -ECBM operation while considering four different stress-dependent permeability models that have been implemented into the simulator. Finally, the TOUGH-FLAC simulator is applied in non-isothermal simulations to model THM responses during a CO 2 -ECBM operation.Our simulations show that the permeability evolution, mechanical stress, and deformation are all affected by changes in pressure, temperature and adsorption swelling, with adsorption swelling having the largest effect.more » The calculated stress changes do not induce any mechanical failure in the coal seam, except near the injection well in one case of a very unfavorable stress field.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3]
  1. China Univ. of Mining and Technology, Jiangsu (China). key Lab. of Coal-based CO2 Capture and Geological Storage, State Key Lab. for Geomechanics and Deep Underground Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geosciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geosciences Division
  3. China Univ. of Mining and Technology, Jiangsu (China). key Lab. of Coal-based CO2 Capture and Geological Storage, State Key Lab. for Geomechanics and Deep Underground Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE), Clean Coal and Carbon (FE-20)
OSTI Identifier:
1379888
Alternate Identifier(s):
OSTI ID: 1397665
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
International Journal of Coal Geology
Additional Journal Information:
Journal Volume: 179; Journal Issue: C; Journal ID: ISSN 0166-5162
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 58 GEOSCIENCES; Coupled THM model; CO2 sequestration; CBM production; TOUGH-FLAC; CO2-ECBM

Citation Formats

Ma, Tianran, Rutqvist, Jonny, Oldenburg, Curtis M., and Liu, Weiqun. Coupled thermal–hydrological–mechanical modeling of CO 2 -enhanced coalbed methane recovery. United States: N. p., 2017. Web. doi:10.1016/j.coal.2017.05.013.
Ma, Tianran, Rutqvist, Jonny, Oldenburg, Curtis M., & Liu, Weiqun. Coupled thermal–hydrological–mechanical modeling of CO 2 -enhanced coalbed methane recovery. United States. doi:10.1016/j.coal.2017.05.013.
Ma, Tianran, Rutqvist, Jonny, Oldenburg, Curtis M., and Liu, Weiqun. Mon . "Coupled thermal–hydrological–mechanical modeling of CO 2 -enhanced coalbed methane recovery". United States. doi:10.1016/j.coal.2017.05.013. https://www.osti.gov/servlets/purl/1379888.
@article{osti_1379888,
title = {Coupled thermal–hydrological–mechanical modeling of CO 2 -enhanced coalbed methane recovery},
author = {Ma, Tianran and Rutqvist, Jonny and Oldenburg, Curtis M. and Liu, Weiqun},
abstractNote = {CO 2 -enhanced coalbed methane recovery, also known as CO 2 -ECBM, is a potential win-win approach for enhanced methane production while simultaneously sequestering injected anthropogenic CO 2 to decrease CO 2 emissions into the atmosphere. Here, CO 2 -ECBM is simulated using a coupled thermal–hydrological–mechanical (THM) numerical model that considers multiphase (gas and water) flow and solubility, multicomponent (CO2 and CH 4 ) diffusion and adsorption, heat transfer and coal deformation. The coupled model is based on the TOUGH-FLAC simulator, which is applied here for the first time to model CO 2 -ECBM. The capacity of the simulator for modeling methane production is verified by a code-to-code comparison with the general-purpose finite-element solver COMSOL. Then, the TOUGH-FLAC simulator is applied in an isothermal simulation to study the variations in permeability evolution during a CO 2 -ECBM operation while considering four different stress-dependent permeability models that have been implemented into the simulator. Finally, the TOUGH-FLAC simulator is applied in non-isothermal simulations to model THM responses during a CO 2 -ECBM operation.Our simulations show that the permeability evolution, mechanical stress, and deformation are all affected by changes in pressure, temperature and adsorption swelling, with adsorption swelling having the largest effect. The calculated stress changes do not induce any mechanical failure in the coal seam, except near the injection well in one case of a very unfavorable stress field.},
doi = {10.1016/j.coal.2017.05.013},
journal = {International Journal of Coal Geology},
number = C,
volume = 179,
place = {United States},
year = {Mon May 22 00:00:00 EDT 2017},
month = {Mon May 22 00:00:00 EDT 2017}
}

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