Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling
Gas hydrate-bearing sediments (GHBS) are vastly distributed around the globe. While gas production attempts are made through GHBS, long-term production remains a challenge due to complex inter-related mechanisms involved. Better understating of long-term responses requires sound physical modelling c...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_18001.pdf |
| _version_ | 1797835275883249664 |
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| author | Baghbanrezvan Sina Ng Charles wang wai |
| author_facet | Baghbanrezvan Sina Ng Charles wang wai |
| author_sort | Baghbanrezvan Sina |
| collection | DOAJ |
| description | Gas hydrate-bearing sediments (GHBS) are vastly distributed around the globe. While gas production attempts are made through GHBS, long-term production remains a challenge due to complex inter-related mechanisms involved. Better understating of long-term responses requires sound physical modelling conducted under controlled conditions. A novel centrifuge energy harvesting chamber (CEHC) at the HKUST centrifuge facility is used in this study. This is the first chamber that can operate at elevated gravities with the capability of sustaining the thermodynamically favourable conditions for gas hydrate formation, sustaining a continuous inflow of high-pressure water at the boundaries during dissociation, and an in-flight control of wellbore pressure and surcharge loading. Centrifuge modelling can recreate the insitu stress gradient in a relatively small model and expedite conduction and convection processes involved during dissociation. Consequently, long-term in-situ mechanisms can be evaluated with a small model and short time. A test was conducted at 40g to evaluate the temperature-pressure response as well as gas production behaviour of hydrate-bearing clayey-sand during depressurization. The results suggests that the gas flow rate is governed by the initial available latent heat as well as the conduction and convection heat through the surrounding sediments. However, as the depressurization progresses, the gas production rate is governed by the competing effects of hydrate dissociation and re-formation which both evolves the permeability of the sediment. Details of the experiment and test results are reported in this paper. |
| first_indexed | 2024-04-09T14:51:37Z |
| format | Article |
| id | doaj.art-01361c2a9cb6415a9d07adb776138640 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-04-09T14:51:37Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-01361c2a9cb6415a9d07adb7761386402023-05-02T09:28:20ZengEDP SciencesE3S Web of Conferences2267-12422023-01-013821800110.1051/e3sconf/202338218001e3sconf_unsat2023_18001Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modellingBaghbanrezvan Sina0Ng Charles wang wai1Geotechnical Centrifuge Facility, Hong Kong University of Science and Technology, Clear Water BayDepartment of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water BayGas hydrate-bearing sediments (GHBS) are vastly distributed around the globe. While gas production attempts are made through GHBS, long-term production remains a challenge due to complex inter-related mechanisms involved. Better understating of long-term responses requires sound physical modelling conducted under controlled conditions. A novel centrifuge energy harvesting chamber (CEHC) at the HKUST centrifuge facility is used in this study. This is the first chamber that can operate at elevated gravities with the capability of sustaining the thermodynamically favourable conditions for gas hydrate formation, sustaining a continuous inflow of high-pressure water at the boundaries during dissociation, and an in-flight control of wellbore pressure and surcharge loading. Centrifuge modelling can recreate the insitu stress gradient in a relatively small model and expedite conduction and convection processes involved during dissociation. Consequently, long-term in-situ mechanisms can be evaluated with a small model and short time. A test was conducted at 40g to evaluate the temperature-pressure response as well as gas production behaviour of hydrate-bearing clayey-sand during depressurization. The results suggests that the gas flow rate is governed by the initial available latent heat as well as the conduction and convection heat through the surrounding sediments. However, as the depressurization progresses, the gas production rate is governed by the competing effects of hydrate dissociation and re-formation which both evolves the permeability of the sediment. Details of the experiment and test results are reported in this paper.https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_18001.pdf |
| spellingShingle | Baghbanrezvan Sina Ng Charles wang wai Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling E3S Web of Conferences |
| title | Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling |
| title_full | Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling |
| title_fullStr | Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling |
| title_full_unstemmed | Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling |
| title_short | Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling |
| title_sort | gas production behaviour of gas hydrate bearing clayey sand during depressurization novel in flight centrifuge modelling |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_18001.pdf |
| work_keys_str_mv | AT baghbanrezvansina gasproductionbehaviourofgashydratebearingclayeysandduringdepressurizationnovelinflightcentrifugemodelling AT ngcharleswangwai gasproductionbehaviourofgashydratebearingclayeysandduringdepressurizationnovelinflightcentrifugemodelling |