Analytical and experimental investigation of pore pressure induced strain softening around boreholes

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dc.contributor.authorLv, Adelina
dc.contributor.authorRamandi, Hamed Lamei
dc.contributor.authorMasoumi, Hossein
dc.contributor.authorSaadatfar, Mohammad
dc.contributor.authorRegenauer-Lieb, Klaus
dc.contributor.authorRoshan, Hamid
dc.date.accessioned2020-06-03T04:07:39Z
dc.date.issued2019
dc.date.updated2019-12-19T07:15:22Z
dc.description.abstractChanges in effective stress around a borehole due to pressure drop can cause formation instabilities leading to issues such as sand/solid production and wellbore stability. Analytical studies have been conducted in the past to gain insights into physical mechanisms involved in this complex process. The developed analytical solutions for such hydro-mechanical instability often consider perfectly plastic behaviour for the rock, whereas the field observations suggest strong strain softening as a result of pore pressure drop. In addition, these analytical solutions are not verified with experimental data in many instances. In this study, we developed a series of closed form solutions to predict the stress and strain changes around a borehole within poro-elasto-softening-plastic concept using Mohr Coulomb failure criterion. For the purpose of describing the pore pressure induced softening behaviour; an exponential function was used to relate the evolution of yield surface to plastic shear strain. In a further step, a series of hollow cylinder experiments were conducted on sandstone samples where different hydrostatic confinements at elevated pore pressures were applied. The hollow cylindrical samples were imaged before and after the experiments using 3D X-ray micro Computed Tomography technique (micro-CT) to precisely identify the collapsed-damaged and plastic zones formed around the borehole. Finally, the results from the experiments and micro-CT analysis were compared with the model prediction and a good agreement was observed.en_AU
dc.description.sponsorshipThis work was supported by the Australian Government Research Training Program Scholarship.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn1365-1609en_AU
dc.identifier.urihttp://hdl.handle.net/1885/204786
dc.language.isoen_AUen_AU
dc.publisherElsevieren_AU
dc.rights© 2018 Elsevier Ltden_AU
dc.sourceInternational Journal of Rock Mechanics and Minings Sciencesen_AU
dc.titleAnalytical and experimental investigation of pore pressure induced strain softening around boreholesen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.lastpage10en_AU
local.bibliographicCitation.startpage1en_AU
local.contributor.affiliationLv, Adelina, University of New South Walesen_AU
local.contributor.affiliationRamandi, Hamed Lamei, The University of New South Walesen_AU
local.contributor.affiliationMasoumi, Hossein , University of New South Walesen_AU
local.contributor.affiliationSaadatfar, Mohammad, College of Science, ANUen_AU
local.contributor.affiliationRegenauer-Lieb, Klaus, The University of New South Walesen_AU
local.contributor.affiliationRoshan, Hamid, University of New South Walesen_AU
local.contributor.authoremailu3270586@anu.edu.auen_AU
local.contributor.authoruidSaadatfar, Mohammad, u3270586en_AU
local.description.embargo2037-12-31
local.description.notesImported from ARIESen_AU
local.identifier.absfor040403 - Geophysical Fluid Dynamicsen_AU
local.identifier.absfor040312 - Structural Geologyen_AU
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciencesen_AU
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciencesen_AU
local.identifier.ariespublicationu3102795xPUB447en_AU
local.identifier.citationvolume113en_AU
local.identifier.doi10.1016/j.ijrmms.2018.11.001en_AU
local.identifier.scopusID2-s2.0-85056959049
local.identifier.uidSubmittedByu3102795en_AU
local.publisher.urlhttps://www.elsevier.com/en-auen_AU
local.type.statusPublished Versionen_AU

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