The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir

Abstract The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synt...

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Autores principales:	Yongfei Li, Yanling Wang, Kun Wang, Foster Gomado, Gangxiao Wang, Longhao Tang, Xufeng Rong
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/12d2be96f0634744963b765440a57da8
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spelling	oai:doaj.org-article:12d2be96f0634744963b765440a57da82021-12-02T11:41:13ZThe effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir10.1038/s41598-018-25100-92045-2322https://doaj.org/article/12d2be96f0634744963b765440a57da82018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25100-9https://doaj.org/toc/2045-2322Abstract The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synthesized and characterized by different methods. the contact angles of water and n-decane on the shale increased from 36° and 0° to 121° and 105°, respectively, after treated by N-ethyl-N-hydroxyethyl perfluorooctanoamide (0.5 wt.%). The surface free energy reduced from 72 mN/m to 7.4 mN/m. The results agreed with that of imbibition and capillary tube rise test. Additionally, the analysis of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of shale surface remarkably increased. These results fully proved that the shale wettability is changed to super gas-wetting. Besides, the thermal analysis revealed that the novel fluorocarbon surfactant has good thermal stability. This indicates that it can be better applied to reservoir modifications at higher temperatures.Yongfei LiYanling WangKun WangFoster GomadoGangxiao WangLonghao TangXufeng RongNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yongfei Li Yanling Wang Kun Wang Foster Gomado Gangxiao Wang Longhao Tang Xufeng Rong The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
description	Abstract The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synthesized and characterized by different methods. the contact angles of water and n-decane on the shale increased from 36° and 0° to 121° and 105°, respectively, after treated by N-ethyl-N-hydroxyethyl perfluorooctanoamide (0.5 wt.%). The surface free energy reduced from 72 mN/m to 7.4 mN/m. The results agreed with that of imbibition and capillary tube rise test. Additionally, the analysis of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of shale surface remarkably increased. These results fully proved that the shale wettability is changed to super gas-wetting. Besides, the thermal analysis revealed that the novel fluorocarbon surfactant has good thermal stability. This indicates that it can be better applied to reservoir modifications at higher temperatures.
format	article
author	Yongfei Li Yanling Wang Kun Wang Foster Gomado Gangxiao Wang Longhao Tang Xufeng Rong
author_facet	Yongfei Li Yanling Wang Kun Wang Foster Gomado Gangxiao Wang Longhao Tang Xufeng Rong
author_sort	Yongfei Li
title	The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
title_short	The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
title_full	The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
title_fullStr	The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
title_full_unstemmed	The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
title_sort	effect of n-ethyl-n-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/12d2be96f0634744963b765440a57da8
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The effect of N-ethyl-N-hydroxyethyl perfluorooctanoamide on wettability alteration of shale reservoir

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