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1、LectureitemsLoggingUp?WirelineLogServices.WhatLogscanmeasure?TheroleoftheWellLogAnalystCreatingtheWellLog“LoggingOperation”Soundwavesthroughopenholeloggingoperation.LWD&MWDLoggingUpTologthewell,drillingmustbestoppedandthedrillstringmustberemovedfromtheborehole.Typica
2、lly,thewinchlowersthewirelinecableandsondetothebottomoftheborehole.Whenthesondeisonthebottom,thewinchslowlyrisesituptothesurface.Whenitmovesupthroughtheborehole,thesondetakesformationmeasurements.Thisiscalled"loggingup.Insomecases,measurementsmaybetakenasthesondeislo
3、weredintotheborehole.Theelectricalcablecarriespowertothesonde.Measurementsarenotstoredinthesonde.Instead,formationmeasurementsaretransmittedupholethroughthecabletotheloggingunitforprocessing.WirelineLogServicesThereareseveralwirelineloggingservices,someofwhicharesimi
4、lartoLWD,suchas(gammaray(GR),resistivity,andnuclear((porosityandbulkdensity).Otherservicesthatwirelinelogmeasurementshave,notofferedbyLWDasSeismic.Thisserviceusesadevice,suchasanairgun,atthesurfacetoproducesoundwavesintheformation.Ageophoneisloweredintotheborehole.As
5、itisrisesuptothesurface,thegeophonedetectsthesoundwavesandconvertsthemintoanelectricvoltage.LogsproducedbythisserviceareusedtodeterminethelithologyandporosityoftheformationFormationtestingandsamplingThewirelinetoolhasthecapabilityoftakingsamplesoftheformation.Therear
6、etwomethodsfortakingsamples.Inbothmethods,thesamplesarebroughttothesurfaceandanalyzedtoaccuratelydeterminethepropertiesoftheformation.i-Sidewallcoring-Ahollowcylinderisshotintotheformationandpulledouttoretrieveacoresample.ii-Fluidsampling-Thesondehaspadsattachedtoleg
7、s.Thelegsareextendedsothatthepadsareforcedagainstthewallsoftheborehole.Thisallowsformationfluidtoflowintooneormoretanksinsidethesonde.Cased-holeloggingWirelineloggingcanbedoneincasedholes.Casingisthin-walled,steelpipethatisrunintheholetopreventboreholecollapseasdrill
8、ingprogresses.Thecasingiscementedtotheboreholewall.Wirelinehasdevelopedinstrumentsthatcantakeformationmeasurementswithoutinterferen