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5 <br />evaluate cemented <br />ol, i.e. sensitivity to <br />id calibration. This <br />with two receivers <br />neasurement is self <br />,ofgreatinterestin <br />icher. It is usually <br />r upper half of the <br />nsity Lo¢ (VDL), <br />the sisnal prints a <br />:iple therefore, it is <br />to casing arrivals <br />can be seen due to <br />;rand out clearly. <br />rum the casing are <br />:asin~ cement and <br />-roux auxiliary for <br />is tool has eight <br />d5° intervals. The <br />wave thus passes <br />fitted corresponds <br />is the convolution <br />:, a measurement <br />roperly cemented <br />Fig. 5.7, -Principle oC the tarinble-deitsit~ recordin_. <br />(Scldunrbrrger documenq <br /> loo <br />I µ sec iooo <br />t <br /> r <br />, <br /> ' r <br />Stronq .F • . . <br /> V T .' - <br />Casinq <br />~ <br />tt . <br />Signal , <br /> w r ~ , <br /> rl. <br />Csq. collar ; Y ~ as <br /> <br />~~ t <br />~c <br /> ~ ; <br />{ <br />)y} <br /> }{ <br />(,Z , <br />WeaM . <br />Formation <br />Signor <br /> tt <br />~~ <br />o ~ \' <br />- <br />Csq c <br />llar ; , I <br />; ~;e <br />~~: <br /> l' <br />` <br />ioi µ sec ~ooo <br />•.•xct~ ) A`1 <br />"~4 Stronq <br />~ For motion <br />.11 $ignni <br />s%~~ l <br />1 <br />.. 1~~ ~ I Weak <br />' Casing <br />~+ Signal <br />Ji) ~ ,;y1 <br />t~~4;, i.~`~. <br />~~.11r~ <br />t .• ! Stronger <br />~ /~! ~ ~ ~ Casing <br />,` ' Signal <br />a. <br />~~ Fig. 5.8. -Examples o(VDL. <br />~ 15~~4(umber,grr document) <br />a. !n free casino, <br />b. In cemented cnsin~. <br />b. <br />