Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates
Formation and dissociation of pore gas hydrates in permafrost can change its properties, including fluid flow capacity. Permeability is one of the most significant parameters in the study of hydrate-containing rocks, especially in the case of gas burial or extraction. Gas permeability variations in...
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ftmdpi:oai:mdpi.com:/2076-3263/12/9/321/ 2023-08-20T04:07:08+02:00 Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates Evgeny Chuvilin Maksim Zhmaev Sergey Grebenkin agris 2022-08-28 application/pdf https://doi.org/10.3390/geosciences12090321 EN eng Multidisciplinary Digital Publishing Institute Cryosphere https://dx.doi.org/10.3390/geosciences12090321 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 12; Issue 9; Pages: 321 frozen sand gas permeability methane carbon dioxide formation dissociation and self-preservation of pore gas hydrates Text 2022 ftmdpi https://doi.org/10.3390/geosciences12090321 2023-08-01T06:15:03Z Formation and dissociation of pore gas hydrates in permafrost can change its properties, including fluid flow capacity. Permeability is one of the most significant parameters in the study of hydrate-containing rocks, especially in the case of gas burial or extraction. Gas permeability variations in frozen sand partially saturated with CO2 or CH4 hydrates are studied experimentally at a constant negative temperature of −5 °C, as well as during freezing–thawing cycles. The gas permeability behavior is controlled by the formation and dissociation of pore gas hydrates in frozen sand samples. The samples with an initial ice saturation of 40 to 60% become at least half as permeable, as 40% of pore ice converts to hydrate. The dissociation process of accumulated hydrates was modeled by both depressurizing methane or CO2 to atmospheric pressure and by stepwise injection of gaseous nitrogen up to 3 MPa into a frozen sample. In sand samples, with a decrease in gas pressure and without subsequent injection of nitrogen, a decrease in pore hydrate dissociation due to self-preservation was noted, which is reflected by a deceleration of gas permeability. Nitrogen injection did not lead to a decrease in the rate of dissociation in the frozen hydrate-containing sample, respectively, as there was no decrease in the rate of gas permeability. Text Ice permafrost MDPI Open Access Publishing Geosciences 12 9 321 |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
topic |
frozen sand gas permeability methane carbon dioxide formation dissociation and self-preservation of pore gas hydrates |
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frozen sand gas permeability methane carbon dioxide formation dissociation and self-preservation of pore gas hydrates Evgeny Chuvilin Maksim Zhmaev Sergey Grebenkin Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
topic_facet |
frozen sand gas permeability methane carbon dioxide formation dissociation and self-preservation of pore gas hydrates |
description |
Formation and dissociation of pore gas hydrates in permafrost can change its properties, including fluid flow capacity. Permeability is one of the most significant parameters in the study of hydrate-containing rocks, especially in the case of gas burial or extraction. Gas permeability variations in frozen sand partially saturated with CO2 or CH4 hydrates are studied experimentally at a constant negative temperature of −5 °C, as well as during freezing–thawing cycles. The gas permeability behavior is controlled by the formation and dissociation of pore gas hydrates in frozen sand samples. The samples with an initial ice saturation of 40 to 60% become at least half as permeable, as 40% of pore ice converts to hydrate. The dissociation process of accumulated hydrates was modeled by both depressurizing methane or CO2 to atmospheric pressure and by stepwise injection of gaseous nitrogen up to 3 MPa into a frozen sample. In sand samples, with a decrease in gas pressure and without subsequent injection of nitrogen, a decrease in pore hydrate dissociation due to self-preservation was noted, which is reflected by a deceleration of gas permeability. Nitrogen injection did not lead to a decrease in the rate of dissociation in the frozen hydrate-containing sample, respectively, as there was no decrease in the rate of gas permeability. |
format |
Text |
author |
Evgeny Chuvilin Maksim Zhmaev Sergey Grebenkin |
author_facet |
Evgeny Chuvilin Maksim Zhmaev Sergey Grebenkin |
author_sort |
Evgeny Chuvilin |
title |
Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
title_short |
Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
title_full |
Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
title_fullStr |
Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
title_full_unstemmed |
Gas Permeability Behavior in Frozen Sand Controlled by Formation and Dissociation of Pore Gas Hydrates |
title_sort |
gas permeability behavior in frozen sand controlled by formation and dissociation of pore gas hydrates |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/geosciences12090321 |
op_coverage |
agris |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Geosciences; Volume 12; Issue 9; Pages: 321 |
op_relation |
Cryosphere https://dx.doi.org/10.3390/geosciences12090321 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences12090321 |
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Geosciences |
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12 |
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9 |
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321 |
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1774718592576651264 |