Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling

Abstract Hydraulic fracturing is widely applied for economical gas production from shale reservoirs. Still, the swelling of the clay micro/nano pores due to retained fluid from hydraulic fracturing causes a gradual reduction of gas production. Four different gas-bearing shale samples with different...

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Autores principales:	Di Zhang, Jay N. Meegoda, Bruno M. Goncalves da Silva, Liming Hu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4751f65578c04dcb8c862e03ce4e0b48
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spelling	oai:doaj.org-article:4751f65578c04dcb8c862e03ce4e0b482021-12-02T18:01:48ZImpact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling10.1038/s41598-021-99523-22045-2322https://doaj.org/article/4751f65578c04dcb8c862e03ce4e0b482021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99523-2https://doaj.org/toc/2045-2322Abstract Hydraulic fracturing is widely applied for economical gas production from shale reservoirs. Still, the swelling of the clay micro/nano pores due to retained fluid from hydraulic fracturing causes a gradual reduction of gas production. Four different gas-bearing shale samples with different mineralogical characteristics were investigated to study the expected shale swelling and reduction in gas permeability due to hydraulic fracturing. To simulate shale softening, these shale samples were immersed in deionized (DI) water heated to 100 °C temperature and subjected to 8 MPa pressure in a laboratory reactor for 72 hours to simulate shale softening. The low-temperature nitrogen adsorption and density measurements were performed on the original and treated shale to determine the changes in micro and nano pore structure. The micro and nano pore structures changed, and the porosity decreased after shale treatment. The porosity decreased by 4% for clayey shale, while for well-cemented shale the porosity only decreased by 0.52%. The findings showed that the initial mineralogical composition of shale plays a significant role in the change of micro and nano pores and the pore structure alteration due to retained fluid from hydraulic fracturing. A pore network model is used to simulate the permeability of shale used in this study. To define pore structure properties, specific factors such as porosity, pore size, pore throat distribution, and coordination number were used. Furthermore, the anisotropy characteristics of shale were integrated into the model via a coordination number ratio. Finally, the change in permeability due to shale softening was determined and compared with untreated with the progress of shale softening. The simulation showed that the permeability of Longmaxi shale could decrease from 3.82E–16 m2 to 4.71E–17 m2 after treatment.Di ZhangJay N. MeegodaBruno M. Goncalves da SilvaLiming HuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Di Zhang Jay N. Meegoda Bruno M. Goncalves da Silva Liming Hu Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
description	Abstract Hydraulic fracturing is widely applied for economical gas production from shale reservoirs. Still, the swelling of the clay micro/nano pores due to retained fluid from hydraulic fracturing causes a gradual reduction of gas production. Four different gas-bearing shale samples with different mineralogical characteristics were investigated to study the expected shale swelling and reduction in gas permeability due to hydraulic fracturing. To simulate shale softening, these shale samples were immersed in deionized (DI) water heated to 100 °C temperature and subjected to 8 MPa pressure in a laboratory reactor for 72 hours to simulate shale softening. The low-temperature nitrogen adsorption and density measurements were performed on the original and treated shale to determine the changes in micro and nano pore structure. The micro and nano pore structures changed, and the porosity decreased after shale treatment. The porosity decreased by 4% for clayey shale, while for well-cemented shale the porosity only decreased by 0.52%. The findings showed that the initial mineralogical composition of shale plays a significant role in the change of micro and nano pores and the pore structure alteration due to retained fluid from hydraulic fracturing. A pore network model is used to simulate the permeability of shale used in this study. To define pore structure properties, specific factors such as porosity, pore size, pore throat distribution, and coordination number were used. Furthermore, the anisotropy characteristics of shale were integrated into the model via a coordination number ratio. Finally, the change in permeability due to shale softening was determined and compared with untreated with the progress of shale softening. The simulation showed that the permeability of Longmaxi shale could decrease from 3.82E–16 m2 to 4.71E–17 m2 after treatment.
format	article
author	Di Zhang Jay N. Meegoda Bruno M. Goncalves da Silva Liming Hu
author_facet	Di Zhang Jay N. Meegoda Bruno M. Goncalves da Silva Liming Hu
author_sort	Di Zhang
title	Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
title_short	Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
title_full	Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
title_fullStr	Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
title_full_unstemmed	Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
title_sort	impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4751f65578c04dcb8c862e03ce4e0b48
work_keys_str_mv	AT dizhang impactofdeionizedwateronchangesinporosityandpermeabilityofshalesmineralogyduetoclayswelling AT jaynmeegoda impactofdeionizedwateronchangesinporosityandpermeabilityofshalesmineralogyduetoclayswelling AT brunomgoncalvesdasilva impactofdeionizedwateronchangesinporosityandpermeabilityofshalesmineralogyduetoclayswelling AT liminghu impactofdeionizedwateronchangesinporosityandpermeabilityofshalesmineralogyduetoclayswelling
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Impact of de-ionized water on changes in porosity and permeability of shales mineralogy due to clay-swelling

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