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...
Main Authors: | , , , , , |
---|---|
Language: | unknown |
Published: |
2009
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/835142 https://www.osti.gov/biblio/835142 |
id |
ftosti:oai:osti.gov:835142 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:835142 2023-07-30T04:04:48+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 2009-12-16 application/pdf http://www.osti.gov/servlets/purl/835142 https://www.osti.gov/biblio/835142 unknown http://www.osti.gov/servlets/purl/835142 https://www.osti.gov/biblio/835142 03 NATURAL GAS 58 GEOSCIENCES AQUIFERS DISSOCIATION GAS HYDRATES HOT WATER HYDRATES METHANE NORTHWEST TERRITORIES PERMEABILITY PRODUCTION SATURATION SENSITIVITY SIMULATORS SPECIFIC HEAT STABILITY STIMULATION THERMAL CONDUCTIVITY 2009 ftosti 2023-07-11T08:40:14Z 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. Other/Unknown Material Mackenzie Delta Methane hydrate Northwest Territories permafrost SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Northwest Territories |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
03 NATURAL GAS 58 GEOSCIENCES AQUIFERS DISSOCIATION GAS HYDRATES HOT WATER HYDRATES METHANE NORTHWEST TERRITORIES PERMEABILITY PRODUCTION SATURATION SENSITIVITY SIMULATORS SPECIFIC HEAT STABILITY STIMULATION THERMAL CONDUCTIVITY |
spellingShingle |
03 NATURAL GAS 58 GEOSCIENCES AQUIFERS DISSOCIATION GAS HYDRATES HOT WATER HYDRATES METHANE NORTHWEST TERRITORIES PERMEABILITY PRODUCTION SATURATION SENSITIVITY SIMULATORS SPECIFIC HEAT STABILITY STIMULATION THERMAL CONDUCTIVITY 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 |
03 NATURAL GAS 58 GEOSCIENCES AQUIFERS DISSOCIATION GAS HYDRATES HOT WATER HYDRATES METHANE NORTHWEST TERRITORIES PERMEABILITY PRODUCTION SATURATION SENSITIVITY SIMULATORS SPECIFIC HEAT STABILITY STIMULATION THERMAL CONDUCTIVITY |
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. |
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 |
publishDate |
2009 |
url |
http://www.osti.gov/servlets/purl/835142 https://www.osti.gov/biblio/835142 |
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_relation |
http://www.osti.gov/servlets/purl/835142 https://www.osti.gov/biblio/835142 |
_version_ |
1772816396157190144 |