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1、ICCC20151PreliminaryComparativeEvaluationofWellbeCementShaleastheMajSubsurfaceHydraulicBarriers:MicroMechanicsMicrostructuresM.RadonjicH.DuD.KupresanA.OlabodeSustainableEnergyEnvironmentalResearch(SEER)labsCraftRadonjica
2、nouterpipewith10cmOD6mmwallthicknessaninnerpipewith6cmOD2.8mmwallthickness.Theweldingbeadontheinsidewalloftheinnerpipewasmachinedoutaquarterinchsteelplateringwasweldedatthebottomofthesampletosealthespacebetweenthetwopipe
3、s.Theannulusbetweeninnerouterpipeswascementedwithtwocementdesigns:1.56gcm30.87wcratiocementslurry1.96gcm30.38wcratiocementslurry.Bothslurrieswerepreparedinafourliter3.75hsepowerlabatyblenderat20800rpm.The0.87wcratiosampl
4、eswerecuredinawaterbathfaminimumperiodof28dayswiththewaterPHbeingkeptbetween1213bymixingthewaterwithCa(OH)2.The0.38wcratiosampleswerecuredftwoyearsinawaterbathwithapHofapproximately10to13.Defoamingagentbentonitewereuseda
5、sadditivesftheAPIClassHcement(APIRecommendedPractice10B).2.3.MicroindentationThemicroindentationtestusedanestablishedmethod.HardnessYoung’smoduluswereobtainedwithcomputationmethodfromW.OliverseeFigure1.Whenreachingaprese
6、tmaximumvaluethenmalloadisreduceduntilpartialcompleteunloadingofthesampleoccurs.Feachloadingunloadingcycletheappliedloadvalueisplottedwithrespecttothecrespondingpositionoftheindenter.Sixspotindentationwascompletedinafmof
7、a3lineprofileoneverysamplerangingfromouterpipepositiontotheinnerregionofthecementsheathcoveringitsentirecrosssection.Thetestingwasconductedoncementcontrolsamplesimmediatelyafterexpansionafter30dayperiodofrehydration.Thei
8、ndentationtestwasalsoconductedonshalesamplesasanaturalhydraulicbarrierindertocompareitsmechanicalpropertiestocementsamplesasanartificialhydraulicbarrier.Thefollowingsetofconditionswasusedinalltheindentationexperiments:th
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