Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada
The Mallik site represents an onshore permafrost-associated gas hydrate accumulation in the Mackenzie Delta, Northwest Territories, Canada. A gas hydrate research well was drilled at the site in 1998. The objective of this study is the analysis of various gas production scenarios from several gas-hy...
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Lawrence Berkeley National Laboratory
2002
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ftunivnotexas:info:ark/67531/metadc785184 2023-05-15T17:09:30+02:00 Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada Moridis, George J. Collett, Timothy S. Dallimore, Scott R. Satoh, Tohru Hancock, Steven Weatherill, Brian United States. Office of the Assistant Secretary for Fossil Energy. 2002-05-08 38 pages Text https://digital.library.unt.edu/ark:/67531/metadc785184/ English eng Lawrence Berkeley National Laboratory rep-no: LBNL--50257 grantno: AC03-76SF00098 osti: 835142 https://digital.library.unt.edu/ark:/67531/metadc785184/ ark: ark:/67531/metadc785184 Journal Name: Journal of Petroleum Science and Engineering; Journal Volume: 43; Journal Issue: 3-4; Other Information: Submitted to Journal of Petroleum Science and Engineering, Volume 43, No.3-4; Journal Publication Date: 08/2004 Simulators Specific Heat Saturation Dissociation Thermal Conductivity Hydrates 58 Geosciences Sensitivity Methane Production Stability Gas Hydrates Hot Water Stimulation Northwest Territories 03 Natural Gas Permeability Aquifers Article 2002 ftunivnotexas 2017-09-23T22:07:46Z The Mallik site represents an onshore permafrost-associated gas hydrate accumulation in the Mackenzie Delta, Northwest Territories, Canada. A gas hydrate research well was drilled at the site in 1998. The objective of this study is the analysis of various gas production scenarios from several gas-hydrate-bearing zones at the Mallik site. The TOUGH2 general-purpose simulator with the EOSHYDR2 module were used for the analysis. EOSHYDR2 is designed to model the non-isothermal CH{sub 4} release, phase behavior and flow under conditions typical of methane-hydrate deposits by solving the coupled equations of mass and heat balance, and can describe any combination of gas hydrate dissociation mechanisms. Numerical simulations indicated that significant gas hydrate production at the Mallik site was possible by drawing down the pressure on a thin free-gas zone at the base of the hydrate stability field. Gas hydrate zones with underlying aquifers yielded significant gas production entirely from dissociated gas hydrate, but large amounts of produced water. Lithologically isolated gas-hydrate-bearing reservoirs with no underlying free gas or water zones, and gas-hydrate saturations of at least 50% were also studied. In these cases, it was assumed that thermal stimulation by circulating hot water in the well was the method used to induce dissociation. Sensitivity studies indicated that the methane release from the hydrate accumulations increases with gas-hydrate saturation, the initial formation temperature, the temperature of the circulating water in the well, and the formation thermal conductivity. Methane production appears to be less sensitive to the rock and hydrate specific heat and permeability of the formation. Article in Journal/Newspaper Mackenzie Delta Methane hydrate Northwest Territories permafrost University of North Texas: UNT Digital Library Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Northwest Territories |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Simulators Specific Heat Saturation Dissociation Thermal Conductivity Hydrates 58 Geosciences Sensitivity Methane Production Stability Gas Hydrates Hot Water Stimulation Northwest Territories 03 Natural Gas Permeability Aquifers |
spellingShingle |
Simulators Specific Heat Saturation Dissociation Thermal Conductivity Hydrates 58 Geosciences Sensitivity Methane Production Stability Gas Hydrates Hot Water Stimulation Northwest Territories 03 Natural Gas Permeability Aquifers Moridis, George J. Collett, Timothy S. Dallimore, Scott R. Satoh, Tohru Hancock, Steven Weatherill, Brian Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
topic_facet |
Simulators Specific Heat Saturation Dissociation Thermal Conductivity Hydrates 58 Geosciences Sensitivity Methane Production Stability Gas Hydrates Hot Water Stimulation Northwest Territories 03 Natural Gas Permeability Aquifers |
description |
The Mallik site represents an onshore permafrost-associated gas hydrate accumulation in the Mackenzie Delta, Northwest Territories, Canada. A gas hydrate research well was drilled at the site in 1998. The objective of this study is the analysis of various gas production scenarios from several gas-hydrate-bearing zones at the Mallik site. The TOUGH2 general-purpose simulator with the EOSHYDR2 module were used for the analysis. EOSHYDR2 is designed to model the non-isothermal CH{sub 4} release, phase behavior and flow under conditions typical of methane-hydrate deposits by solving the coupled equations of mass and heat balance, and can describe any combination of gas hydrate dissociation mechanisms. Numerical simulations indicated that significant gas hydrate production at the Mallik site was possible by drawing down the pressure on a thin free-gas zone at the base of the hydrate stability field. Gas hydrate zones with underlying aquifers yielded significant gas production entirely from dissociated gas hydrate, but large amounts of produced water. Lithologically isolated gas-hydrate-bearing reservoirs with no underlying free gas or water zones, and gas-hydrate saturations of at least 50% were also studied. In these cases, it was assumed that thermal stimulation by circulating hot water in the well was the method used to induce dissociation. Sensitivity studies indicated that the methane release from the hydrate accumulations increases with gas-hydrate saturation, the initial formation temperature, the temperature of the circulating water in the well, and the formation thermal conductivity. Methane production appears to be less sensitive to the rock and hydrate specific heat and permeability of the formation. |
author2 |
United States. Office of the Assistant Secretary for Fossil Energy. |
format |
Article in Journal/Newspaper |
author |
Moridis, George J. Collett, Timothy S. Dallimore, Scott R. Satoh, Tohru Hancock, Steven Weatherill, Brian |
author_facet |
Moridis, George J. Collett, Timothy S. Dallimore, Scott R. Satoh, Tohru Hancock, Steven Weatherill, Brian |
author_sort |
Moridis, George J. |
title |
Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
title_short |
Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
title_full |
Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
title_fullStr |
Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
title_full_unstemmed |
Numerical studies of gas production from several CH4-hydrate zones at the Mallik Site, Mackenzie Delta, Canada |
title_sort |
numerical studies of gas production from several ch4-hydrate zones at the mallik site, mackenzie delta, canada |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
2002 |
url |
https://digital.library.unt.edu/ark:/67531/metadc785184/ |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Canada Mackenzie Delta Northwest Territories |
geographic_facet |
Canada Mackenzie Delta Northwest Territories |
genre |
Mackenzie Delta Methane hydrate Northwest Territories permafrost |
genre_facet |
Mackenzie Delta Methane hydrate Northwest Territories permafrost |
op_source |
Journal Name: Journal of Petroleum Science and Engineering; Journal Volume: 43; Journal Issue: 3-4; Other Information: Submitted to Journal of Petroleum Science and Engineering, Volume 43, No.3-4; Journal Publication Date: 08/2004 |
op_relation |
rep-no: LBNL--50257 grantno: AC03-76SF00098 osti: 835142 https://digital.library.unt.edu/ark:/67531/metadc785184/ ark: ark:/67531/metadc785184 |
_version_ |
1766065605821071360 |