Please use this identifier to cite or link to this item: https://doi.org/10.3390/en12224225
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dc.titleEffect of shale anisotropy on hydration and its implications for water uptake
dc.contributor.authorLu, Y.
dc.contributor.authorZeng, L.
dc.contributor.authorJin, Y.
dc.contributor.authorChen, G.
dc.contributor.authorRen, J.
dc.contributor.authorLau, H.C.
dc.contributor.authorXie, Q.
dc.date.accessioned2021-12-29T04:31:55Z
dc.date.available2021-12-29T04:31:55Z
dc.date.issued2019
dc.identifier.citationLu, Y., Zeng, L., Jin, Y., Chen, G., Ren, J., Lau, H.C., Xie, Q. (2019). Effect of shale anisotropy on hydration and its implications for water uptake. Energies 12 (22) : 4225. ScholarBank@NUS Repository. https://doi.org/10.3390/en12224225
dc.identifier.issn19961073
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/212260
dc.description.abstractWater uptake induced by fluid-rock interaction plays a significant role in the recovery of flowback water during hydraulic fracturing. However, the existing accounts fail to fully acknowledge the significance of shale anisotropy on water uptake typically under in situ reservoir temperature. Thus we investigated the shale-hydration anisotropy using two sets of shale samples from the Longmaxi Formation in Sichuan Basin, China, which are designated to imbibe water parallel and perpendicular to shale bedding planes. All the samples were immersed in distilled water for one to five days at 80 °C or 120 °C. Furthermore, samples' topographical and elemental variations before and after hydration were quantified using energy-dispersive spectroscopy-field-emission scanning electron microscopy. Our results show that shale anisotropy and imbibition time strongly affect the width of pre-existing micro-fracture in hydrated samples. For imbibition parallel to lamination, the width of pre-existing micro-fracture initially decreases and leads to crack-healing. Subsequently, the crack surfaces slightly collapse and the micro-fracture width is enlarged. In contrast, imbibition perpendicular to lamination does not generate new micro-fracture. Our results imply that during the flowback process of hydraulic fracturing fluid, the shale permeability parallel to bedding planes likely decreases first then increases, thereby promoting the water uptake. © 2019 by the authors.
dc.publisherMDPI AG
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScopus OA2019
dc.subjectAnisotropy
dc.subjectHydration
dc.subjectHydraulic fracturing
dc.subjectShale reservoirs
dc.subjectWater uptake
dc.typeArticle
dc.contributor.departmentDEPT OF CIVIL & ENVIRONMENTAL ENGG
dc.description.doi10.3390/en12224225
dc.description.sourcetitleEnergies
dc.description.volume12
dc.description.issue22
dc.description.page4225
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