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Nondestructive natural gas hydrate recovery driven by air and carbon dioxide
Current technologies for production of natural gas hydrates (NGH), which include thermal stimulation, depressurization and inhibitor injection, have raised concerns over unintended consequences. The possibility of catastrophic slope failure and marine ecosystem damage remain serious challenges to sa...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4196106/ https://www.ncbi.nlm.nih.gov/pubmed/25311102 http://dx.doi.org/10.1038/srep06616 |
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author | Kang, Hyery Koh, Dong-Yeun Lee, Huen |
author_facet | Kang, Hyery Koh, Dong-Yeun Lee, Huen |
author_sort | Kang, Hyery |
collection | PubMed |
description | Current technologies for production of natural gas hydrates (NGH), which include thermal stimulation, depressurization and inhibitor injection, have raised concerns over unintended consequences. The possibility of catastrophic slope failure and marine ecosystem damage remain serious challenges to safe NGH production. As a potential approach, this paper presents air-driven NGH recovery from permeable marine sediments induced by simultaneous mechanisms for methane liberation (NGH decomposition) and CH(4)-air or CH(4)-CO(2)/air replacement. Air is diffused into and penetrates NGH and, on its surface, forms a boundary between the gas and solid phases. Then spontaneous melting proceeds until the chemical potentials become equal in both phases as NGH depletion continues and self-regulated CH(4)-air replacement occurs over an arbitrary point. We observed the existence of critical methane concentration forming the boundary between decomposition and replacement mechanisms in the NGH reservoirs. Furthermore, when CO(2) was added, we observed a very strong, stable, self-regulating process of exchange (CH(4) replaced by CO(2)/air; hereafter CH(4)-CO(2)/air) occurring in the NGH. The proposed process will work well for most global gas hydrate reservoirs, regardless of the injection conditions or geothermal gradient. |
format | Online Article Text |
id | pubmed-4196106 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-41961062014-10-21 Nondestructive natural gas hydrate recovery driven by air and carbon dioxide Kang, Hyery Koh, Dong-Yeun Lee, Huen Sci Rep Article Current technologies for production of natural gas hydrates (NGH), which include thermal stimulation, depressurization and inhibitor injection, have raised concerns over unintended consequences. The possibility of catastrophic slope failure and marine ecosystem damage remain serious challenges to safe NGH production. As a potential approach, this paper presents air-driven NGH recovery from permeable marine sediments induced by simultaneous mechanisms for methane liberation (NGH decomposition) and CH(4)-air or CH(4)-CO(2)/air replacement. Air is diffused into and penetrates NGH and, on its surface, forms a boundary between the gas and solid phases. Then spontaneous melting proceeds until the chemical potentials become equal in both phases as NGH depletion continues and self-regulated CH(4)-air replacement occurs over an arbitrary point. We observed the existence of critical methane concentration forming the boundary between decomposition and replacement mechanisms in the NGH reservoirs. Furthermore, when CO(2) was added, we observed a very strong, stable, self-regulating process of exchange (CH(4) replaced by CO(2)/air; hereafter CH(4)-CO(2)/air) occurring in the NGH. The proposed process will work well for most global gas hydrate reservoirs, regardless of the injection conditions or geothermal gradient. Nature Publishing Group 2014-10-14 /pmc/articles/PMC4196106/ /pubmed/25311102 http://dx.doi.org/10.1038/srep06616 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Kang, Hyery Koh, Dong-Yeun Lee, Huen Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title | Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title_full | Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title_fullStr | Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title_full_unstemmed | Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title_short | Nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
title_sort | nondestructive natural gas hydrate recovery driven by air and carbon dioxide |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4196106/ https://www.ncbi.nlm.nih.gov/pubmed/25311102 http://dx.doi.org/10.1038/srep06616 |
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