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Article: An anisotropic viscoplasticity model for shale based on layered microstructure homogenization

TitleAn anisotropic viscoplasticity model for shale based on layered microstructure homogenization
Authors
Keywordsanisotropy
creep
homogenization
shale
viscoplasticity
Issue Date2021
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312
Citation
International Journal for Numerical and Analytical Methods in Geomechanics, 2021, v. 45 n. 4, p. 502-520 How to Cite?
AbstractViscoplastic deformation of shale is frequently observed in many subsurface applications. Many studies have suggested that this viscoplastic behavior is anisotropic—specifically, transversely isotropic—and closely linked to the layered composite structure at the microscale. In this work, we develop a two-scale constitutive model for shale in which anisotropic viscoplastic behavior naturally emerges from semianalytical homogenization of a bilayer microstructure. The microstructure is modeled as a composite of soft layers, representing a ductile matrix formed by clay and organics, and hard layers, corresponding to a brittle matrix composed of stiff minerals. This layered microstructure renders the macroscopic behavior anisotropic, even when the individual layers are modeled with isotropic constitutive laws. Using a common correlation between clay and organic content and magnitude of creep, we apply a viscoplastic modified Cam-Clay plasticity model to the soft layers, while treating the hard layers as a linear elastic material to minimize the number of calibration parameters. We then describe the implementation of the proposed model in a standard material update subroutine. The model is validated with laboratory creep data on samples from three gas shale formations. We also demonstrate the computational behavior of the proposed model through simulation of time-dependent borehole closure in a shale formation with different bedding plane directions.
DescriptionHybrid open access
Persistent Identifierhttp://hdl.handle.net/10722/299146
ISSN
2023 Impact Factor: 3.4
2023 SCImago Journal Rankings: 1.132
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChoo, J-
dc.contributor.authorSemnani, SJ-
dc.contributor.authorWhite, JA-
dc.date.accessioned2021-04-28T02:26:47Z-
dc.date.available2021-04-28T02:26:47Z-
dc.date.issued2021-
dc.identifier.citationInternational Journal for Numerical and Analytical Methods in Geomechanics, 2021, v. 45 n. 4, p. 502-520-
dc.identifier.issn0363-9061-
dc.identifier.urihttp://hdl.handle.net/10722/299146-
dc.descriptionHybrid open access-
dc.description.abstractViscoplastic deformation of shale is frequently observed in many subsurface applications. Many studies have suggested that this viscoplastic behavior is anisotropic—specifically, transversely isotropic—and closely linked to the layered composite structure at the microscale. In this work, we develop a two-scale constitutive model for shale in which anisotropic viscoplastic behavior naturally emerges from semianalytical homogenization of a bilayer microstructure. The microstructure is modeled as a composite of soft layers, representing a ductile matrix formed by clay and organics, and hard layers, corresponding to a brittle matrix composed of stiff minerals. This layered microstructure renders the macroscopic behavior anisotropic, even when the individual layers are modeled with isotropic constitutive laws. Using a common correlation between clay and organic content and magnitude of creep, we apply a viscoplastic modified Cam-Clay plasticity model to the soft layers, while treating the hard layers as a linear elastic material to minimize the number of calibration parameters. We then describe the implementation of the proposed model in a standard material update subroutine. The model is validated with laboratory creep data on samples from three gas shale formations. We also demonstrate the computational behavior of the proposed model through simulation of time-dependent borehole closure in a shale formation with different bedding plane directions.-
dc.languageeng-
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312-
dc.relation.ispartofInternational Journal for Numerical and Analytical Methods in Geomechanics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectanisotropy-
dc.subjectcreep-
dc.subjecthomogenization-
dc.subjectshale-
dc.subjectviscoplasticity-
dc.titleAn anisotropic viscoplasticity model for shale based on layered microstructure homogenization-
dc.typeArticle-
dc.identifier.emailChoo, J: jchoo@hku.hk-
dc.identifier.authorityChoo, J=rp02364-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1002/nag.3167-
dc.identifier.scopuseid_2-s2.0-85097028704-
dc.identifier.hkuros322303-
dc.identifier.volume45-
dc.identifier.issue4-
dc.identifier.spage502-
dc.identifier.epage520-
dc.identifier.isiWOS:000595323700001-
dc.publisher.placeUnited Kingdom-

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