Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals
Clay mineral hydration and dehydration processes are reversible at temperatures <100 °C and strongly affect wellbore stability, fines migration, permeability, and dispersion of pore pressure. The hydration behavior of smectite-rich material as a function of relative humidity (activity of water, a...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_04009.pdf |
| _version_ | 1819066844358639616 |
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| author | Day-Stirrat Ruarri J. Bryndzia L. Taras |
| author_facet | Day-Stirrat Ruarri J. Bryndzia L. Taras |
| author_sort | Day-Stirrat Ruarri J. |
| collection | DOAJ |
| description | Clay mineral hydration and dehydration processes are reversible at temperatures <100 °C and strongly affect wellbore stability, fines migration, permeability, and dispersion of pore pressure. The hydration behavior of smectite-rich material as a function of relative humidity (activity of water, aw, controlled by salinity) and temperature was studied using in situ X-ray diffraction on a material retrieved from coring in the Gulf of Mexico. X-ray diffraction profile fitting was used to explore the competition for water between hydratable phases across a range of relative humidity, 2 % to 90 %, and temperature, 25°C to 95°C, conditions. X-ray diffraction profile fitting employed a modified multi-specimen approach in which proportions of minerals were modelled using Ca-exchanged preparations in air-dried and ethylene glycol solvated states. Across the range of hydration states, the mineral proportions and crystallographic parameters remained constant from the multi-specimen approach and only the number of water layers in hydratable phases varied. Quantitative clay mineralogy showed a natural material with a discrete smectite component and a mixed-layered illite-smectite, both capable of hydration/dehydration. Results of this study showed the discrete smectite component and the mixed-layered illite-smectite hydrated at different rates with discrete smectite up-taking more water at lower relative humidity than the mixed-layered illite-smectite. Over geological time this study highlights the non-static nature of smectite hydration with implications of long-term creep and permeability behavior. |
| first_indexed | 2024-12-21T16:08:49Z |
| format | Article |
| id | doaj.art-501a8f9a18c44ef1b8155dbf45f763bb |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-21T16:08:49Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-501a8f9a18c44ef1b8155dbf45f763bb2022-12-21T18:57:50ZengEDP SciencesE3S Web of Conferences2267-12422020-01-012050400910.1051/e3sconf/202020504009e3sconf_icegt2020_04009Hydration behavior by X-ray diffraction profile fitting of smectite-bearing mineralsDay-Stirrat Ruarri J.0Bryndzia L. Taras1Shell International Exploration and Production Inc., Shell Technology Center HoustonShell International Exploration and Production Inc., Shell Technology Center HoustonClay mineral hydration and dehydration processes are reversible at temperatures <100 °C and strongly affect wellbore stability, fines migration, permeability, and dispersion of pore pressure. The hydration behavior of smectite-rich material as a function of relative humidity (activity of water, aw, controlled by salinity) and temperature was studied using in situ X-ray diffraction on a material retrieved from coring in the Gulf of Mexico. X-ray diffraction profile fitting was used to explore the competition for water between hydratable phases across a range of relative humidity, 2 % to 90 %, and temperature, 25°C to 95°C, conditions. X-ray diffraction profile fitting employed a modified multi-specimen approach in which proportions of minerals were modelled using Ca-exchanged preparations in air-dried and ethylene glycol solvated states. Across the range of hydration states, the mineral proportions and crystallographic parameters remained constant from the multi-specimen approach and only the number of water layers in hydratable phases varied. Quantitative clay mineralogy showed a natural material with a discrete smectite component and a mixed-layered illite-smectite, both capable of hydration/dehydration. Results of this study showed the discrete smectite component and the mixed-layered illite-smectite hydrated at different rates with discrete smectite up-taking more water at lower relative humidity than the mixed-layered illite-smectite. Over geological time this study highlights the non-static nature of smectite hydration with implications of long-term creep and permeability behavior.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_04009.pdf |
| spellingShingle | Day-Stirrat Ruarri J. Bryndzia L. Taras Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals E3S Web of Conferences |
| title | Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals |
| title_full | Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals |
| title_fullStr | Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals |
| title_full_unstemmed | Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals |
| title_short | Hydration behavior by X-ray diffraction profile fitting of smectite-bearing minerals |
| title_sort | hydration behavior by x ray diffraction profile fitting of smectite bearing minerals |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_04009.pdf |
| work_keys_str_mv | AT daystirratruarrij hydrationbehaviorbyxraydiffractionprofilefittingofsmectitebearingminerals AT bryndzialtaras hydrationbehaviorbyxraydiffractionprofilefittingofsmectitebearingminerals |