Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands
In this work, the decomposition behaviour of methane hydrate in porous media was investigated microscopically using powder X-ray diffraction, cryogenic scanning electron microscopy and in situ Raman spectroscopy. The effect of grain sizes on the decomposition of methane hydrate was measured. The res...
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ROYAL SOC CHEMISTRY
2019
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/50442 2023-05-15T17:11:40+02:00 Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands Wen, Long Zhou, Xuebing Liang, Deqing 2019 http://ir.gig.ac.cn/handle/344008/50442 https://doi.org/10.1039/c9ra01611b 英语 eng ROYAL SOC CHEMISTRY RSC ADVANCES http://ir.gig.ac.cn/handle/344008/50442 doi:10.1039/c9ra01611b Chemistry Multidisciplinary MOLECULAR-DYNAMICS SIMULATIONS STRATIGRAPHIC TEST WELL CARBON-DIOXIDE NUMERICAL-ANALYSIS PARTICLE SIZES POROUS-MEDIA DISSOCIATION PERMEABILITY SEDIMENTS CORES 期刊论文 2019 ftchacadscgigcas https://doi.org/10.1039/c9ra01611b 2020-12-22T07:22:33Z In this work, the decomposition behaviour of methane hydrate in porous media was investigated microscopically using powder X-ray diffraction, cryogenic scanning electron microscopy and in situ Raman spectroscopy. The effect of grain sizes on the decomposition of methane hydrate was measured. The results showed that bulk hydrates could exist stably at 223 K and atmospheric pressure because of the self-preservation effect. However, hydrate formed in sands was relatively easier to decompose because it had a higher equilibrium pressure compared with bulk hydrate at the same temperature. In this case, there would be a higher decomposition driving force. Interestingly, the complete decomposition time for hydrate formed in sands did not decrease with the decrease in particle size. The shortest decomposition time was observed for the sands with the particle size range of 38-55 m, which was less than 30 minutes. Moreover methane hydrate was found to decompose faster in the porous medium containing 3.5 wt% NaCl, which suggested that there was almost no self-preservation effect. In situ Raman measurements showed that the integrated intensity ratio of methane in large and small cages (A(L)/A(S)) did not change during the decomposition process, suggesting that the methane hydrate crystal units decomposed as an entity in sands. This study provided important data as a basis for drilling fluid technology in hydrate mining. Report Methane hydrate Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) RSC Advances 9 26 14727 14735 |
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Open Polar |
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Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Chemistry Multidisciplinary MOLECULAR-DYNAMICS SIMULATIONS STRATIGRAPHIC TEST WELL CARBON-DIOXIDE NUMERICAL-ANALYSIS PARTICLE SIZES POROUS-MEDIA DISSOCIATION PERMEABILITY SEDIMENTS CORES |
spellingShingle |
Chemistry Multidisciplinary MOLECULAR-DYNAMICS SIMULATIONS STRATIGRAPHIC TEST WELL CARBON-DIOXIDE NUMERICAL-ANALYSIS PARTICLE SIZES POROUS-MEDIA DISSOCIATION PERMEABILITY SEDIMENTS CORES Wen, Long Zhou, Xuebing Liang, Deqing Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
topic_facet |
Chemistry Multidisciplinary MOLECULAR-DYNAMICS SIMULATIONS STRATIGRAPHIC TEST WELL CARBON-DIOXIDE NUMERICAL-ANALYSIS PARTICLE SIZES POROUS-MEDIA DISSOCIATION PERMEABILITY SEDIMENTS CORES |
description |
In this work, the decomposition behaviour of methane hydrate in porous media was investigated microscopically using powder X-ray diffraction, cryogenic scanning electron microscopy and in situ Raman spectroscopy. The effect of grain sizes on the decomposition of methane hydrate was measured. The results showed that bulk hydrates could exist stably at 223 K and atmospheric pressure because of the self-preservation effect. However, hydrate formed in sands was relatively easier to decompose because it had a higher equilibrium pressure compared with bulk hydrate at the same temperature. In this case, there would be a higher decomposition driving force. Interestingly, the complete decomposition time for hydrate formed in sands did not decrease with the decrease in particle size. The shortest decomposition time was observed for the sands with the particle size range of 38-55 m, which was less than 30 minutes. Moreover methane hydrate was found to decompose faster in the porous medium containing 3.5 wt% NaCl, which suggested that there was almost no self-preservation effect. In situ Raman measurements showed that the integrated intensity ratio of methane in large and small cages (A(L)/A(S)) did not change during the decomposition process, suggesting that the methane hydrate crystal units decomposed as an entity in sands. This study provided important data as a basis for drilling fluid technology in hydrate mining. |
format |
Report |
author |
Wen, Long Zhou, Xuebing Liang, Deqing |
author_facet |
Wen, Long Zhou, Xuebing Liang, Deqing |
author_sort |
Wen, Long |
title |
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
title_short |
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
title_full |
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
title_fullStr |
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
title_full_unstemmed |
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
title_sort |
microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands |
publisher |
ROYAL SOC CHEMISTRY |
publishDate |
2019 |
url |
http://ir.gig.ac.cn/handle/344008/50442 https://doi.org/10.1039/c9ra01611b |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
RSC ADVANCES http://ir.gig.ac.cn/handle/344008/50442 doi:10.1039/c9ra01611b |
op_doi |
https://doi.org/10.1039/c9ra01611b |
container_title |
RSC Advances |
container_volume |
9 |
container_issue |
26 |
container_start_page |
14727 |
op_container_end_page |
14735 |
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1766068451127853056 |