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Article: A cohesive element-Based numerical manifold method for hydraulic fracturing modelling with Voronoi grains

TitleA cohesive element-Based numerical manifold method for hydraulic fracturing modelling with Voronoi grains
Authors
KeywordsNumerical manifold method
Coupled hydro-mechanical model
Micro-structure
Hydraulic fracturing
Cohesive element
Issue Date2019
PublisherSpringer-Verlag Wien. The Journal's web site is located at http://www.springer.at/rock_mechanics
Citation
Rock Mechanics and Rock Engineering, 2019, v. 52 n. 7, p. 2335-2359 How to Cite?
AbstractIn this study, the cohesive element-based numerical manifold method with Voronoi grains is extended by incorporating a coupled hydro-mechanical (HM) model to investigate hydraulic fracturing of rock at micro-scale. The proposed hydraulic solving framework, which explicitly calculates the flow rate and fluid pressure of a compressible viscous fluid based on the cubic law and a linear fluid compressibility model, is first validated against analytical solutions for uncoupled transient and steady flow examples. Then the coupled HM procedure is further verified by two coupled examples, which respectively considers the elastic response of a pressurized fracture and hydraulic fracture (HF) propagation under different perforation inclinations and in situ stresses. Finally, the developed method is adopted to investigate the hydraulic fracture propagation in Augig granite possessing multi-fractures at micro-scale, based on which the effect of friction coefficient of natural fractures (NFs) on hydraulic fracture propagation is examined. The results show that the friction coefficient of the NFs has significant effects on the induced hydraulic fracture pattern. With increasing friction coefficient of the NFs, it becomes more difficult for the NFs to fail, which results in simpler HF patterns. This phenomenon is associated with the change in the type of interaction between HFs and NFs, i.e., from HFs being arrested by NFs to HFs crossing the NFs with offsets and then to HFs directly crossing NFs.
Persistent Identifierhttp://hdl.handle.net/10722/274986
ISSN
2017 Impact Factor: 2.819
2015 SCImago Journal Rankings: 1.939

 

DC FieldValueLanguage
dc.contributor.authorWu, Z-
dc.contributor.authorSun, H-
dc.contributor.authorWong, LNY-
dc.date.accessioned2019-09-10T02:33:01Z-
dc.date.available2019-09-10T02:33:01Z-
dc.date.issued2019-
dc.identifier.citationRock Mechanics and Rock Engineering, 2019, v. 52 n. 7, p. 2335-2359-
dc.identifier.issn0723-2632-
dc.identifier.urihttp://hdl.handle.net/10722/274986-
dc.description.abstractIn this study, the cohesive element-based numerical manifold method with Voronoi grains is extended by incorporating a coupled hydro-mechanical (HM) model to investigate hydraulic fracturing of rock at micro-scale. The proposed hydraulic solving framework, which explicitly calculates the flow rate and fluid pressure of a compressible viscous fluid based on the cubic law and a linear fluid compressibility model, is first validated against analytical solutions for uncoupled transient and steady flow examples. Then the coupled HM procedure is further verified by two coupled examples, which respectively considers the elastic response of a pressurized fracture and hydraulic fracture (HF) propagation under different perforation inclinations and in situ stresses. Finally, the developed method is adopted to investigate the hydraulic fracture propagation in Augig granite possessing multi-fractures at micro-scale, based on which the effect of friction coefficient of natural fractures (NFs) on hydraulic fracture propagation is examined. The results show that the friction coefficient of the NFs has significant effects on the induced hydraulic fracture pattern. With increasing friction coefficient of the NFs, it becomes more difficult for the NFs to fail, which results in simpler HF patterns. This phenomenon is associated with the change in the type of interaction between HFs and NFs, i.e., from HFs being arrested by NFs to HFs crossing the NFs with offsets and then to HFs directly crossing NFs.-
dc.languageeng-
dc.publisherSpringer-Verlag Wien. The Journal's web site is located at http://www.springer.at/rock_mechanics-
dc.relation.ispartofRock Mechanics and Rock Engineering-
dc.rightsThis is a post-peer-review, pre-copyedit version of an article published in [insert journal title]. The final authenticated version is available online at: http://dx.doi.org/[insert DOI]-
dc.subjectNumerical manifold method-
dc.subjectCoupled hydro-mechanical model-
dc.subjectMicro-structure-
dc.subjectHydraulic fracturing-
dc.subjectCohesive element-
dc.titleA cohesive element-Based numerical manifold method for hydraulic fracturing modelling with Voronoi grains-
dc.typeArticle-
dc.identifier.emailWong, LNY: lnywong@hku.hk-
dc.identifier.authorityWong, LNY=rp02069-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s00603-018-1717-5-
dc.identifier.scopuseid_2-s2.0-85059549202-
dc.identifier.hkuros305065-
dc.identifier.volume52-
dc.identifier.issue7-
dc.identifier.spage2335-
dc.identifier.epage2359-
dc.publisher.placeAustria-

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