Stability Condition of Methane Hydrate in Fine-Grained Sediment
Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities (ρd = 1.40, 1.50 and 1.60 g/cm3) and various initial water saturations b...
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ftmdpi:oai:mdpi.com:/2077-1312/11/1/196/ 2023-08-20T04:07:56+02:00 Stability Condition of Methane Hydrate in Fine-Grained Sediment Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao agris 2023-01-12 application/pdf https://doi.org/10.3390/jmse11010196 EN eng Multidisciplinary Digital Publishing Institute Marine Energy https://dx.doi.org/10.3390/jmse11010196 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 11; Issue 1; Pages: 196 fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Text 2023 ftmdpi https://doi.org/10.3390/jmse11010196 2023-08-01T08:16:16Z Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities (ρd = 1.40, 1.50 and 1.60 g/cm3) and various initial water saturations by the multi-step heating method. The experimental result showed that the methane hydrate formation in fine-grained sediment required lower temperature and/or higher pressure compared to that in bulk state. At the same time, it is found that the deviation degree of P–T conditions of methane hydrate in fine-grained sediment with different dry density and initial water saturation are completely different from that in pure water. In addition, according to the nuclear magnetic resonance technique (NMR), the changes in NMR signal intensity during the formation and decomposition of methane hydrate in silt were analyzed. Regardless of formation and dissociation stages, liquid water always distributes in the small sediment pores. An empirical formula is developed to address the capillary suction of water and hydrate with respect to the unhydrated water within sediment. Furthermore, a phase equilibrium model is proposed to predict the stability conditions of hydrate-bearing fine-grained sediment. Text Methane hydrate MDPI Open Access Publishing Journal of Marine Science and Engineering 11 1 196 |
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fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model |
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fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao Stability Condition of Methane Hydrate in Fine-Grained Sediment |
topic_facet |
fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model |
description |
Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities (ρd = 1.40, 1.50 and 1.60 g/cm3) and various initial water saturations by the multi-step heating method. The experimental result showed that the methane hydrate formation in fine-grained sediment required lower temperature and/or higher pressure compared to that in bulk state. At the same time, it is found that the deviation degree of P–T conditions of methane hydrate in fine-grained sediment with different dry density and initial water saturation are completely different from that in pure water. In addition, according to the nuclear magnetic resonance technique (NMR), the changes in NMR signal intensity during the formation and decomposition of methane hydrate in silt were analyzed. Regardless of formation and dissociation stages, liquid water always distributes in the small sediment pores. An empirical formula is developed to address the capillary suction of water and hydrate with respect to the unhydrated water within sediment. Furthermore, a phase equilibrium model is proposed to predict the stability conditions of hydrate-bearing fine-grained sediment. |
format |
Text |
author |
Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao |
author_facet |
Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao |
author_sort |
Di Lu |
title |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_short |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_full |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_fullStr |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_full_unstemmed |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_sort |
stability condition of methane hydrate in fine-grained sediment |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/jmse11010196 |
op_coverage |
agris |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Journal of Marine Science and Engineering; Volume 11; Issue 1; Pages: 196 |
op_relation |
Marine Energy https://dx.doi.org/10.3390/jmse11010196 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse11010196 |
container_title |
Journal of Marine Science and Engineering |
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11 |
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1 |
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196 |
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1774719918236762112 |