Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data
The numerical simulator TOUGH+HYDRATE (T+H) was used to predict the transient pure methane hydrate (no sediment) dissociation data. X-ray computed tomography (CT) was used to visualize the methane hydrate formation and dissociation processes. A methane hydrate sample was formed from granular ice in...
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Lawrence Berkeley National Laboratory
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ftunivnotexas:info:ark/67531/metadc930881 2023-05-15T17:11:23+02:00 Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data Gupta, A. Moridis, G.J. Kneafsey, T.J. Sloan, Jr., E.D. Lawrence Berkeley National Laboratory. Earth Sciences Division. 2009-08-15 Text https://doi.org/10.1021/ef9006565 https://digital.library.unt.edu/ark:/67531/metadc930881/ English eng Lawrence Berkeley National Laboratory rep-no: LBNL-2749E grantno: DE-AC02-05CH11231 doi:10.1021/ef9006565 osti: 974438 https://digital.library.unt.edu/ark:/67531/metadc930881/ ark: ark:/67531/metadc930881 Journal Name: Energy and Fuels; Journal Volume: 23; Journal Issue: 12 Computerized Tomography 58 Transients Sediments Pipelines 54 Hydrates Simulation Methane Production Water Gas Hydrates Simulators Stimulation Depressurization Dissociation Mass Transfer Article 2009 ftunivnotexas https://doi.org/10.1021/ef9006565 2017-09-30T22:08:02Z The numerical simulator TOUGH+HYDRATE (T+H) was used to predict the transient pure methane hydrate (no sediment) dissociation data. X-ray computed tomography (CT) was used to visualize the methane hydrate formation and dissociation processes. A methane hydrate sample was formed from granular ice in a cylindrical vessel, and slow depressurization combined with thermal stimulation was applied to dissociate the hydrate sample. CT images showed that the water produced from the hydrate dissociation accumulated at the bottom of the vessel and increased the hydrate dissociation rate there. CT images were obtained during hydrate dissociation to confirm the radial dissociation of the hydrate sample. This radial dissociation process has implications for dissociation of hydrates in pipelines, suggesting lower dissociation times than for longitudinal dissociation. These observations were also confirmed by the numerical simulator predictions, which were in good agreement with the measured thermal data during hydrate dissociation. System pressure and sample temperature measured at the sample center followed the CH{sub 4} hydrate L{sub w}+H+V equilibrium line during hydrate dissociation. The predicted cumulative methane gas production was within 5% of the measured data. Thus, this study validated our simulation approach and assumptions, which include stationary pure methane hydrate-skeleton, equilibrium hydrate-dissociation and heat- and mass-transfer in predicting hydrate dissociation in the absence of sediments. It should be noted that the application of T+H for the pure methane hydrate system (no sediment) is outside the general applicability limits of T+H. Article in Journal/Newspaper Methane hydrate University of North Texas: UNT Digital Library Energy & Fuels 23 12 5958 5965 |
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Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Computerized Tomography 58 Transients Sediments Pipelines 54 Hydrates Simulation Methane Production Water Gas Hydrates Simulators Stimulation Depressurization Dissociation Mass Transfer |
spellingShingle |
Computerized Tomography 58 Transients Sediments Pipelines 54 Hydrates Simulation Methane Production Water Gas Hydrates Simulators Stimulation Depressurization Dissociation Mass Transfer Gupta, A. Moridis, G.J. Kneafsey, T.J. Sloan, Jr., E.D. Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
topic_facet |
Computerized Tomography 58 Transients Sediments Pipelines 54 Hydrates Simulation Methane Production Water Gas Hydrates Simulators Stimulation Depressurization Dissociation Mass Transfer |
description |
The numerical simulator TOUGH+HYDRATE (T+H) was used to predict the transient pure methane hydrate (no sediment) dissociation data. X-ray computed tomography (CT) was used to visualize the methane hydrate formation and dissociation processes. A methane hydrate sample was formed from granular ice in a cylindrical vessel, and slow depressurization combined with thermal stimulation was applied to dissociate the hydrate sample. CT images showed that the water produced from the hydrate dissociation accumulated at the bottom of the vessel and increased the hydrate dissociation rate there. CT images were obtained during hydrate dissociation to confirm the radial dissociation of the hydrate sample. This radial dissociation process has implications for dissociation of hydrates in pipelines, suggesting lower dissociation times than for longitudinal dissociation. These observations were also confirmed by the numerical simulator predictions, which were in good agreement with the measured thermal data during hydrate dissociation. System pressure and sample temperature measured at the sample center followed the CH{sub 4} hydrate L{sub w}+H+V equilibrium line during hydrate dissociation. The predicted cumulative methane gas production was within 5% of the measured data. Thus, this study validated our simulation approach and assumptions, which include stationary pure methane hydrate-skeleton, equilibrium hydrate-dissociation and heat- and mass-transfer in predicting hydrate dissociation in the absence of sediments. It should be noted that the application of T+H for the pure methane hydrate system (no sediment) is outside the general applicability limits of T+H. |
author2 |
Lawrence Berkeley National Laboratory. Earth Sciences Division. |
format |
Article in Journal/Newspaper |
author |
Gupta, A. Moridis, G.J. Kneafsey, T.J. Sloan, Jr., E.D. |
author_facet |
Gupta, A. Moridis, G.J. Kneafsey, T.J. Sloan, Jr., E.D. |
author_sort |
Gupta, A. |
title |
Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
title_short |
Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
title_full |
Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
title_fullStr |
Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
title_full_unstemmed |
Modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of X-ray computed tomography and macroscopic data |
title_sort |
modeling pure methane hydrate dissociation using a numerical simulator from a novel combination of x-ray computed tomography and macroscopic data |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
2009 |
url |
https://doi.org/10.1021/ef9006565 https://digital.library.unt.edu/ark:/67531/metadc930881/ |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Journal Name: Energy and Fuels; Journal Volume: 23; Journal Issue: 12 |
op_relation |
rep-no: LBNL-2749E grantno: DE-AC02-05CH11231 doi:10.1021/ef9006565 osti: 974438 https://digital.library.unt.edu/ark:/67531/metadc930881/ ark: ark:/67531/metadc930881 |
op_doi |
https://doi.org/10.1021/ef9006565 |
container_title |
Energy & Fuels |
container_volume |
23 |
container_issue |
12 |
container_start_page |
5958 |
op_container_end_page |
5965 |
_version_ |
1766068177997922304 |