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1、SimulationExperimentsinElectromagneticTomographyWellLogginginTwo-phaseFlow2006PetroleumScience,,o1.3No.3SimulationExperimentsinElectromagneticTomographyWellLogginginTwo—phaseFlowWuXilingandZhaoYanwei(ResearchCenterofWellLogging,SchoolofResourcesandlnformationChinaUniversityofPetrol
2、eum,Beo'ing102249,China)Abstract:ElectromagneticComputerTomography(ECT)isamethodtoprobetheinteriorofaninhomogeneousmediumviasurlhcemeasurementinanon-linearway.Duetotheeatdifferencesinconductivityandpermittivitybetweenoilandwaterinthewell,ElectromagneticTomographyWellLogging(ETWL),a
3、newflowimagingmeasurementsystem,isproposedtodescribethedistributionandmovementofoil/watertwo-phaseflowinthewellbyscanningthedetectedreglonandapplyingasuitabledataprocessingalgorithm.Theresultsofthenumericalsimulationandphysicalmodelingshowthatthesystemcouldprovideaclearimageofthefl
4、owprofile.Keywords:Oilwell,two-phaseflow,electromagnetictomography,welllogging1.IntroductionMultiphaseflowinanoilwellisadynamicphenomenonofinhomogeneousmedium,whichshouldbestudiedinanon.1inearway.Conventionalflowmeasuringtechniquesarelinearmethodsaveragingthelocalvalues.Thesecannot
5、giveaccuratedescriptionsofthefluiddistributionandmovementinthewel1.Fordecades,flowimagingwellloggingtechniques,asanon-linearmeasuringmethod,havemadegreatprogresswiththedevelopmentofmeasurementscienceandcomputertechnique(YoungandJohnson.1997).ThispaperpresentsElectromagneticTomograp
6、hyWeULogging(ETWL)usingtwo—phaseflowimagingsensors,basedonmultipleelectricalimpedancemeasurements.TheelectrodeconfigurationisoptimizedtoprovideimagedinfoITI1ationofthedistributionandmovementoffluidswithintheprobe'ssensingvolume.Sotheresultscanprovideasoundfoundationfortheproduction
7、profileanddynamicanalysisofanoilreservoir.Tomographyisusedtoobtaincross.sectionalimagesoftheobjectsbynon.destructivemeans.TomographyimagingisoriginallydevelopedformedicalpurposeasanimprovementtotheexistingX-rayradiographypractices.However,thereisagrowinginterestintomographyimagingf
8、oruseintheindustrialproces
