Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir
Depressurization combined with brine injection is a potential method for field production of natural gas hydrate, which can significantly improve production efficiency and avoid secondary formation of hydrate. In this work, the experiments of hydrate production using depressurization combined with b...
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2022
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ftdoajarticles:oai:doaj.org/article:ade5fac073e9465790b93664410889b1 2023-05-15T17:12:08+02:00 Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir Haopeng Zeng Yu Zhang Lei Zhang Zhaoyang Chen Xiaosen Li 2022-05-01T00:00:00Z https://doi.org/10.3390/e24060765 https://doaj.org/article/ade5fac073e9465790b93664410889b1 EN eng MDPI AG https://www.mdpi.com/1099-4300/24/6/765 https://doaj.org/toc/1099-4300 doi:10.3390/e24060765 1099-4300 https://doaj.org/article/ade5fac073e9465790b93664410889b1 Entropy, Vol 24, Iss 765, p 765 (2022) methane hydrate depressurization NaCl concentration gas production excess-water Science Q Astrophysics QB460-466 Physics QC1-999 article 2022 ftdoajarticles https://doi.org/10.3390/e24060765 2022-12-30T22:29:59Z Depressurization combined with brine injection is a potential method for field production of natural gas hydrate, which can significantly improve production efficiency and avoid secondary formation of hydrate. In this work, the experiments of hydrate production using depressurization combined with brine injection from a simulated excess-water hydrate reservoir were performed, and the effects of NaCl concentration on hydrate decomposition, temperature change, and heat transfer in the reservoir were investigated. The experimental results indicate that there is little gas production during depressurization in a excess-water hydrate reservoir, and the gas dissociated from hydrate is trapped in pores of sediments. The high-water production reduces the final gas recovery, which is lower than 70% in the experiments. The increasing NaCl concentration only effectively promotes gas production rate in the early stage. The final cumulative gas production and average gas production rate have little difference in different experiments. The NaCl concentration of the produced water is significantly higher than that which is in contact with hydrate in the sediments because the water produced by hydrate decomposition exists on the surface of undissociated hydrate. The high concentration of NaCl in the produced water from the reactor significantly reduces the promoting effect and efficiency of NaCl solution on hydrate decomposition. The injection of NaCl solution decreases the lowest temperature in sediments during hydrate production, and increases the sensible heat and heat transfer from environment for hydrate decomposition. The changes of temperature and resistance effectively reflect the distribution of the injected NaCl solution in the hydrate reservoir. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Entropy 24 6 765 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
methane hydrate depressurization NaCl concentration gas production excess-water Science Q Astrophysics QB460-466 Physics QC1-999 |
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methane hydrate depressurization NaCl concentration gas production excess-water Science Q Astrophysics QB460-466 Physics QC1-999 Haopeng Zeng Yu Zhang Lei Zhang Zhaoyang Chen Xiaosen Li Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
topic_facet |
methane hydrate depressurization NaCl concentration gas production excess-water Science Q Astrophysics QB460-466 Physics QC1-999 |
description |
Depressurization combined with brine injection is a potential method for field production of natural gas hydrate, which can significantly improve production efficiency and avoid secondary formation of hydrate. In this work, the experiments of hydrate production using depressurization combined with brine injection from a simulated excess-water hydrate reservoir were performed, and the effects of NaCl concentration on hydrate decomposition, temperature change, and heat transfer in the reservoir were investigated. The experimental results indicate that there is little gas production during depressurization in a excess-water hydrate reservoir, and the gas dissociated from hydrate is trapped in pores of sediments. The high-water production reduces the final gas recovery, which is lower than 70% in the experiments. The increasing NaCl concentration only effectively promotes gas production rate in the early stage. The final cumulative gas production and average gas production rate have little difference in different experiments. The NaCl concentration of the produced water is significantly higher than that which is in contact with hydrate in the sediments because the water produced by hydrate decomposition exists on the surface of undissociated hydrate. The high concentration of NaCl in the produced water from the reactor significantly reduces the promoting effect and efficiency of NaCl solution on hydrate decomposition. The injection of NaCl solution decreases the lowest temperature in sediments during hydrate production, and increases the sensible heat and heat transfer from environment for hydrate decomposition. The changes of temperature and resistance effectively reflect the distribution of the injected NaCl solution in the hydrate reservoir. |
format |
Article in Journal/Newspaper |
author |
Haopeng Zeng Yu Zhang Lei Zhang Zhaoyang Chen Xiaosen Li |
author_facet |
Haopeng Zeng Yu Zhang Lei Zhang Zhaoyang Chen Xiaosen Li |
author_sort |
Haopeng Zeng |
title |
Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
title_short |
Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
title_full |
Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
title_fullStr |
Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
title_full_unstemmed |
Study on Hydrate Production Behaviors by Depressurization Combined with Brine Injection in the Excess-Water Hydrate Reservoir |
title_sort |
study on hydrate production behaviors by depressurization combined with brine injection in the excess-water hydrate reservoir |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/e24060765 https://doaj.org/article/ade5fac073e9465790b93664410889b1 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Entropy, Vol 24, Iss 765, p 765 (2022) |
op_relation |
https://www.mdpi.com/1099-4300/24/6/765 https://doaj.org/toc/1099-4300 doi:10.3390/e24060765 1099-4300 https://doaj.org/article/ade5fac073e9465790b93664410889b1 |
op_doi |
https://doi.org/10.3390/e24060765 |
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Entropy |
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24 |
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6 |
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765 |
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1766068912912334848 |