Configurational diffusion transport of water and oil in dual continuum shales

Abstract Understanding fluid flow in shale rocks is critical for the recovery of unconventional energy resources. Despite the extensive research conducted on water and oil flow in shales, significant uncertainties and discrepancies remain in reported experimental data. The most noted being that whil...

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Autores principales:	Mohammed Abdul Qadeer Siddiqui, Filomena Salvemini, Hamed Lamei Ramandi, Paul Fitzgerald, Hamid Roshan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8d155a820c934ff49961bb23e262a67b
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spelling	oai:doaj.org-article:8d155a820c934ff49961bb23e262a67b2021-12-02T13:57:59ZConfigurational diffusion transport of water and oil in dual continuum shales10.1038/s41598-021-81004-12045-2322https://doaj.org/article/8d155a820c934ff49961bb23e262a67b2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81004-1https://doaj.org/toc/2045-2322Abstract Understanding fluid flow in shale rocks is critical for the recovery of unconventional energy resources. Despite the extensive research conducted on water and oil flow in shales, significant uncertainties and discrepancies remain in reported experimental data. The most noted being that while oil spreads more than water on shale surfaces in an inviscid medium, its uptake by shale pores is much less than water during capillary flow. This leads to misjudgement of wettability and the underlying physical phenomena. In this study, therefore, we performed a combined experimental and digital rock investigation on an organic-rich shale including contact angle and spontaneous imbibition, X-ray and neutron computed tomography, and small angle X-ray scattering tests to study the potential physical processes. We also used non-equilibrium thermodynamics to theoretically derive constitutive equations to support our experimental observations. The results of this study indicate that the pre-existing fractures (first continuum) imbibe more oil than water consistent with contact angle measurements. The overall imbibition is, however, higher for water than oil due to greater water diffusion into the shale matrix (second continuum). It is shown that more water uptake into shale is controlled by pore size and accessibility in addition to capillary or osmotic forces i.e. configurational diffusion of water versus oil molecules. While the inorganic pores seem more oil-wet in an inviscid medium, they easily allow passage of water molecules compared to oil due to the incredibly small size of water molecules that can pass through such micro-pores. Contrarily, these strongly oil-wet pores possessing strong capillarity are restricted to imbibe oil simply due to its large molecular size and physical inaccessibility to the micro-pores. These results provide new insights into the previously unexplained discrepancy regarding water and oil uptake capacity of shales.Mohammed Abdul Qadeer SiddiquiFilomena SalveminiHamed Lamei RamandiPaul FitzgeraldHamid RoshanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mohammed Abdul Qadeer Siddiqui Filomena Salvemini Hamed Lamei Ramandi Paul Fitzgerald Hamid Roshan Configurational diffusion transport of water and oil in dual continuum shales
description	Abstract Understanding fluid flow in shale rocks is critical for the recovery of unconventional energy resources. Despite the extensive research conducted on water and oil flow in shales, significant uncertainties and discrepancies remain in reported experimental data. The most noted being that while oil spreads more than water on shale surfaces in an inviscid medium, its uptake by shale pores is much less than water during capillary flow. This leads to misjudgement of wettability and the underlying physical phenomena. In this study, therefore, we performed a combined experimental and digital rock investigation on an organic-rich shale including contact angle and spontaneous imbibition, X-ray and neutron computed tomography, and small angle X-ray scattering tests to study the potential physical processes. We also used non-equilibrium thermodynamics to theoretically derive constitutive equations to support our experimental observations. The results of this study indicate that the pre-existing fractures (first continuum) imbibe more oil than water consistent with contact angle measurements. The overall imbibition is, however, higher for water than oil due to greater water diffusion into the shale matrix (second continuum). It is shown that more water uptake into shale is controlled by pore size and accessibility in addition to capillary or osmotic forces i.e. configurational diffusion of water versus oil molecules. While the inorganic pores seem more oil-wet in an inviscid medium, they easily allow passage of water molecules compared to oil due to the incredibly small size of water molecules that can pass through such micro-pores. Contrarily, these strongly oil-wet pores possessing strong capillarity are restricted to imbibe oil simply due to its large molecular size and physical inaccessibility to the micro-pores. These results provide new insights into the previously unexplained discrepancy regarding water and oil uptake capacity of shales.
format	article
author	Mohammed Abdul Qadeer Siddiqui Filomena Salvemini Hamed Lamei Ramandi Paul Fitzgerald Hamid Roshan
author_facet	Mohammed Abdul Qadeer Siddiqui Filomena Salvemini Hamed Lamei Ramandi Paul Fitzgerald Hamid Roshan
author_sort	Mohammed Abdul Qadeer Siddiqui
title	Configurational diffusion transport of water and oil in dual continuum shales
title_short	Configurational diffusion transport of water and oil in dual continuum shales
title_full	Configurational diffusion transport of water and oil in dual continuum shales
title_fullStr	Configurational diffusion transport of water and oil in dual continuum shales
title_full_unstemmed	Configurational diffusion transport of water and oil in dual continuum shales
title_sort	configurational diffusion transport of water and oil in dual continuum shales
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8d155a820c934ff49961bb23e262a67b
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Configurational diffusion transport of water and oil in dual continuum shales

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