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20095243()JournalofXianShiyouUniversity(NaturalScienceEdition)May2009Vol.24No.3:2008210225:(863)(:2006AA06Z225):(19602),,,,,.Email:htm@njut.edu.cn.:16732064X(2009)03200312041,2,1,3,1,1,1(1.,210009;2.,210009;3.,610051):.-,..:;;;.25GPa,,25GPa,,,.:;;;:TE26:A(CBL)[122],,,().,,,,.,.,,[325],:,,,;,.,-,,.1-,,,-.[6],-(1),p1p0p2,(1).1-©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()p1=fc2p2-fs0p0fs1-fc1.,fs0=2(1-2s)r20r1Es(r21-r20);fs1=(1+s)[-r20r1-(1-2s)r31]Es(r21-r20);fc1=(1+c)[r1r22+(1-2c)r31]Ec(r22-r21);fc2=2(2c-1)r1r22Ec(r22-r21);r0;r1;r2;EsEc;sc.(1),-p1,.2r,,;,p1,p2,:pr1;p2r2.r=r1-r2.:(1);(2);(3),.2.1r1,.p,p0p0+p,(1),p1-fs0fs1-fc1.p0p1[4]r=(1-s)r1Esr20p0-r21p1r21-r20+(1+s)Esr20r1(p0-p1)r21-r20(2),p0+pf1-fs0fs1-fc1p,r(p0+p)=(1-s)r1Es(r21-r20)r20(p0+p)-r21p1-fs0pfs1-fc1+(1+s)r20r1Es(r21-r20)p0+p-p1+fs0pfs1-fc1,r1=r(p0+p)-r(p0)=(1-s)pr1Es(r21-r20)r20+r21fs0fs1-fc1+(1+s)pr20r1Es(r21-r20)1+fs0fs1-fc1.2.2r2,,,p10,,p2,r2=p2(r2-r1)Ec.r=(1-s)pr1Es(r21-r20)r20+r21fs0fs1-fc1+(1+s)pr20r1Es(r21-r20)1+fs0fs1-fc1-p2(r2-r1)Ec.(3)(3),().3r3.1pr(3),rp,p,.,,,.,,244.5mm(95/8)20MPa,244.5mm(95/8)10MPa[7].3.2p2rr,23©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(r1),(3)(r0=78.54mm,s=0.3,c=0.23,Es=210GPa,Ec=20GPa,p2=10MPa,p=20MPa,19mm),r,2.2r1-r02,,,.6mm16mm(166.7%),73.0m27.6m(62.2%).,.157.1mm10.36mm,43.0m(2).3.4r(r2),(3)(r0=78.54mm,r1=88.54mm,s=0.3,c=0.23,Es=210GPa,Ec=20GPa,p2=10MPa,p=20MPa),r,3.3,,,.13mm25mm(92.3%),50.26m40.79m(18.8%).,.,,,.3r2-r13.5rEc,(3)(r0=78.54mm,r1=88.54mm,r2=107.54mm,s=0.3,c=0.23,Es=210GPa,p2=10MPa,p=20MPa),Ecr,4.44,.25GPa,,,,r1r2.,r1,,,,r1.25GPa,r1;r2,,,,r2x,r233©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.().25GPa,r2,5GPa15GPa,r238.0m12.7m(66.6%),,r2.4(1),.(2).,.(3),,,,,.:[1],,,.[C]//.2008.:,2008.[2].[J].,2003,31(3):36237.[3].[J].,1990,14(1):60266.[4],.[J].:,1994,18(1):10215.[5],.[J].,1996,24(4):31232.[6].[D].:,2006.[7],,,.SY/T546722007,[S].:(27)[3].FisherTZ8B[J].,1995,17(1):25232.[4].[J].,2005,25(3):55257.[5],.E31[J].:,2007,34(6):6142617.[6].[M].:,2004.[7].[M].:,1992.[8].[J].2007,36(3):37240.[9].[J].2000,22(2):1682173.[10].[J].,2004,28(6):58260.[11].[J].,1993,8(2):32236.[12].[J].,2004,28(2):12215.[13].[J].,1995,19(1):28234.[14]MarkA.SippelIntelligentComputingSystemforReservoirAnalysisandRiskAssessmentoftheRedRiverFormation[EB/OL].(2001210211)[2006208212].:43©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:coredisplacement;emulsionmigrationrate;influencingfactor;emulsiondropletdiameter;emulsiondropletconcentra2tionYANGDong2dong1,2,YUEXiang2an1,ZHANGYing2chun2,YANGJian2yuan2(1.EORCenter,KeyLaboratoryofEducationMinis2tryforPetroleumEngineering,ChinaUniversityofPetroleum(Beijing),Beijing102249,China;2.BohaiOilfieldResearchInstituteofExplorationandDevelopment,TianjinBranchCompany,CNOOC,Tanggu300452,Tianjin,China)JXSYU2009V.24N.3p.28230EffectofcasingpressuretestingonthesealingperformanceofcementsheathAbstract:Themicro2gapbetweencasingandcementsheathgeneratedfromcasingpressuretestingisoneofthemainreasonsleadingtothedeclineofthesealingperformanceofthecementsheath.Aquantitativeformulaforcalculatingofthesizeofthemicro2gapisdeducedaccordingtotheforcemodelofcasing22cementsheath,andthefactorsofinfluencingthesizeofmicro2gasareanalyzed.Theresultsshowthatduringpressuretesting,thesizeofthemicro2gapisdirectlyproportionaltowellheadpressure,itisnegativelinearcor2relationwiththepressureofthesurroundingrockandthethicknessofcementsheath,itisdecreaseswiththeincreaseofthewallthick2nessofthecasing.Thesizeofmicro2gapfirstlyincreasesandthendecreaseswiththeincreaseofYoung’smodulusofthecementsheath.WhentheYoung’smodulusis25GPa,thesizeofmicro2gasreachestothegreatestvalue.WhentheYoung’smodulusislessthan25GPa,theYoung’smodulusplaysamoreimportantroleinreducingthesizeofthemicro2gap.ItissuggestedthatthecementstoneofthelowerYoung’smodulusshouldbeselectedwhenthehigh2pressuretestingofcasingisneeded.Keywords:wellcementing;casingpressuretesting;annularmicro2gap;sealingperformanceofcementsheathYAOXiao1,2,ZHOUBing1,LIMei2ping3,LUOXiao1,ZHANGLiang1,HUASu2dong1(1.CollegeofMaterialsScienceandEngi2neering,NanjingUniversit