A cased-hole acoustic logging technique using the dual source of opposite polarity-中国期刊网

摘要 Itisusuallydifficulttomeasureacousticvelocitiesthroughacasing,especiallywhenthecasingispoorlybondedwithformation.AnacousticloggingtechniqueusingthedualsourceofoppositepolarityisproposedtoenhancetheSignaltoNoiseRatiooftheformationsignalandtoreducethecasingwaveinthedataacquisitionprocess.Inwhatfollows,atheoreticalmodelingisusedtocaculatethewavefromsofcasedwells.Andthen,ascaledexperimentwasconductedinthe1:10scaledexperimentalwellusingtheproposedtechniqueinthepoorlybondedcondition.Theresultsshowthatthistechniquecaneffectivelysuppressthecasingwaveandenhancetheformationwave,eveninthepoorly-bondedcondition.Byanalyzingthemeasuredwavefroms,theamplitudeofcasingwaveisreducedto12%comparedtotheconventionalone-sourcetechnique,andthecompressionalwavevelocitycanbeeasilyobtainedbyusingthistechnique.Boththetheoreticalmodelingandexperimentresultsdemonstratethefeasibilityoftheproposedtechnique.Thisstudyestablishesthetheoreticalandexperimentalfoundationforthecased-hole,dualsourceofoppositepolarity,acousticloggingtooldevelopment.

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A cased-hole acoustic logging technique using the dual source of opposite polarity

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A cased-hole acoustic logging technique using the dual source of opposite polarity

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