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International Conference on Gas Hydrates (ICGH) (6th : 2008)
NUMERICAL STUDY ON PERMEABILITY HYSTERESIS DURING HYDRATE DISSOCIATION IN HOT WATER INJECTION Konno, Yoshihiro; Masuda, Yoshihiro; Takenaka, Tsuguhito; Oyama, Hiroyuki; Ouchi, Hisanao; Kurihara, Masanori
Abstract
Hot water injection is a production technique proposed to gas recovery from methane hydrate reservoirs. However, from a practical point of view, the injected water experiences a drop in temperature and re-formation of hydrates may occur in the reservoir. In this work, we proposed a model expressing permeability hysteresis in the processes between hydrate growth and dissociation, and studied hydrate dissociation behavior during hot water injection. The model of permeability hysteresis was incorporated into the simulator MH21-HYDRES (MH21 Hydrate Reservoir Simulator), where the decrease in permeability with hydrate saturation during hydrate growth process was assumed to be much larger than the decrease during hydrate dissociation process. Laboratory hydrate dissociation experiments were carried out for comparison. In each experiment, we injected hot water at a constant rate into a sand-packed core bearing hydrates, and the histories of injection pressure, core temperature, and gas/water production rates were measured. Numerical simulations for the core experiments showed the re-formation of hydrates led to the increase in injection pressure during hot water injection. The simulated tendencies of pressure increase varied markedly by considering permeability hysteresis. Since the experimental pressure increases could not be reproduced without the permeability hysteresis model, the influence of permeability hysteresis should be considered to apply hot water injection to hydrate reservoirs.
Item Metadata
Title |
NUMERICAL STUDY ON PERMEABILITY HYSTERESIS DURING HYDRATE DISSOCIATION IN HOT WATER INJECTION
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Creator | |
Contributor | |
Date Issued |
2008-07
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Description |
Hot water injection is a production technique proposed to gas recovery from methane hydrate
reservoirs. However, from a practical point of view, the injected water experiences a drop in
temperature and re-formation of hydrates may occur in the reservoir. In this work, we proposed a
model expressing permeability hysteresis in the processes between hydrate growth and
dissociation, and studied hydrate dissociation behavior during hot water injection. The model of
permeability hysteresis was incorporated into the simulator MH21-HYDRES (MH21 Hydrate
Reservoir Simulator), where the decrease in permeability with hydrate saturation during hydrate
growth process was assumed to be much larger than the decrease during hydrate dissociation
process. Laboratory hydrate dissociation experiments were carried out for comparison. In each
experiment, we injected hot water at a constant rate into a sand-packed core bearing hydrates, and
the histories of injection pressure, core temperature, and gas/water production rates were
measured. Numerical simulations for the core experiments showed the re-formation of hydrates
led to the increase in injection pressure during hot water injection. The simulated tendencies of
pressure increase varied markedly by considering permeability hysteresis. Since the experimental
pressure increases could not be reproduced without the permeability hysteresis model, the
influence of permeability hysteresis should be considered to apply hot water injection to hydrate
reservoirs.
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Extent |
335198 bytes
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Subject | |
Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-09-30
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0041118
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URI | |
Affiliation | |
Citation |
Konno, Yoshihiro; Masuda, Yoshihiro; Takenaka, Tsuguhito; Oyama, Hiroyuki; Ouchi, Hisanao; Kurihara, Masanori. 2008. NUMERICAL STUDY ON PERMEABILITY HYSTERESIS DURING HYDRATE DISSOCIATION IN HOT WATER INJECTION. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
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Peer Review Status |
Unreviewed
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Copyright Holder |
Konno, Yoshihiro
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International