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      An Improved Coupled Modeling Method for Coalbed Methane Extraction after Hydraulic Fracturing

      1 , 2 , 1 , 2 , 3 , 4 , 1 , 2 , 1 , 2
      Geofluids
      Hindawi Limited

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          Abstract

          This paper proposes an improved coupled modeling method for coalbed methane extraction after hydraulic fracturing. Based on the damage mechanics theory, we introduce a state damage variable to record the damage changes at different times and construct the coupling governing equations of the seepage field and solid mechanics field in the hydraulic fracturing process. Then, the results of hydraulic fracturing simulation are used as initial values to perform coupling modeling for coalbed methane extraction. The method is implemented by the combination of different modules in COMSOL to solve the state damage variable, displacement, and pressure. Additionally, two 2D numerical examples are used to verify the precision of this method, and a 3D coalbed methane extraction simulation is performed to analyze the extraction effects and the evolution characteristics of the permeability before and after hydraulic fracturing. Numerical examples show that the proposed coupling modeling method can not only simplify the calculation steps of the CwM method and reduce the numerical errors caused, but also characterize the damage, porosity, permeability, and extraction effect caused by hydraulic fracturing in coal seams with permeability anisotropy.

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          Numerical simulation of progressive rock failure and associated seismicity

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            Thermo-hydro-mechanical-chemical couplings controlling CH4 production and CO2 sequestration in enhanced coalbed methane recovery

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              Control and prevention of gas outbursts in coal mines, Riosa–Olloniego coalfield, Spain

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                Author and article information

                Contributors
                Journal
                Geofluids
                Geofluids
                Hindawi Limited
                1468-8123
                1468-8115
                April 20 2022
                April 20 2022
                : 2022
                : 1-15
                Affiliations
                [1 ]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
                [2 ]Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China
                [3 ]College of Mining Engineering, Liaoning Technical University, Fuxin 123000, China
                [4 ]Mine Safety Technology Branch, China Coal Research Institute, Beijing 100013, China
                Article
                10.1155/2022/8995347
                113cec31-7159-4622-a667-7b696fc0477a
                © 2022

                https://creativecommons.org/licenses/by/4.0/

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