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International Conference on Gas Hydrates (ICGH) (6th : 2008)
FLUID FLOW THROUGH HETEROGENEOUS METHANE HYDRATE-BEARING SAND: OBSERVATIONS USING X-RAY CT SCANNING Seol, Yongkoo; Kneafsey, Timothy J.
Abstract
The effects of porous medium heterogeneity on methane hydrate formation, water flow through the heterogeneous hydrate-bearing sand, and hydrate dissociation were observed in an experiment using a heterogeneous sand column with prescribed heterogeneities. X-ray computed tomography (CT) was used to monitor saturation changes in water, gas, and hydrate during hydrate formation, water flow, and hydrate dissociation. The sand column was packed in several segments having vertical and horizontal layers with two distinct grain-size sands. The CT images showed that as hydrate formed, the water and hydrate saturations were dynamically redistributed by variations in capillary strength of the medium (the tendency for a material to imbibe water), which changed with the presence and saturation of hydrate. Water preferentially flowed through fine sand near higher hydrate-saturation regions where the capillary strength was elevated relative to the lower hydrate saturation regions. Hydrate dissociation initiated by depressurization varied with different grain sizes and hydrate saturations.
Item Metadata
Title |
FLUID FLOW THROUGH HETEROGENEOUS METHANE HYDRATE-BEARING SAND: OBSERVATIONS USING X-RAY CT SCANNING
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Creator | |
Contributor | |
Date Issued |
2008-07
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Description |
The effects of porous medium heterogeneity on methane hydrate formation, water flow through
the heterogeneous hydrate-bearing sand, and hydrate dissociation were observed in an experiment
using a heterogeneous sand column with prescribed heterogeneities. X-ray computed tomography
(CT) was used to monitor saturation changes in water, gas, and hydrate during hydrate formation,
water flow, and hydrate dissociation. The sand column was packed in several segments having
vertical and horizontal layers with two distinct grain-size sands. The CT images showed that as
hydrate formed, the water and hydrate saturations were dynamically redistributed by variations in
capillary strength of the medium (the tendency for a material to imbibe water), which changed
with the presence and saturation of hydrate. Water preferentially flowed through fine sand near
higher hydrate-saturation regions where the capillary strength was elevated relative to the lower
hydrate saturation regions. Hydrate dissociation initiated by depressurization varied with different
grain sizes and hydrate saturations.
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Extent |
1170649 bytes
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Subject | |
Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-09-17
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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 |
10.14288/1.0041132
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URI | |
Affiliation | |
Citation |
Seol, Yongkoo; Kneafsey, Timothy J. 2008. FLUID FLOW THROUGH HETEROGENEOUS METHANE HYDRATE-BEARING SAND: OBSERVATIONS USING X-RAY CT SCANNING. 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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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International