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z <br />variable density (PDL) - ripe signals, foraation signals, <br />and fluid signals are usually easy to recognize on the vDL. <br />If these signals can to identified, a practical <br />dete^ ination _°or the presence or abs~nca of cement can be <br />made. VDL is lagged cn t:e 5 foot spaced receiver. <br />Casiaq collar locator (CCL) - Used to correlate the bond log <br />with cased hole logs and to match casing collars with the <br />collars that show un on t!:e S'DL portion of the display. <br />Gamma ray - Used to correlate the bond log with other logs. <br />PART III - LOGGING TECF?*JIQUE <br />Calibrate the tool in free pipe at the shop, prior to, and <br />following the log run. =nc!ude calibration data with log. <br />Run receivers spaced ~ feet end 5 feet from transmitter. <br />Run at least 7 bow-^:ce __ _ ~_d aluminum centralizers in <br />vertical holes, o cent_,_____~ in directional hales. ACC:, <br />is not an adeouate cenc_a!:_er. <br />Complete log header •-ith casing/cement data, tool/panel <br />data, gate settings .and tcol sketch showing centralizers. <br />Set the amplitude gate so that skipping does not occur at <br />amplitudes greater than 5 cv. <br />Record amplitude with fixed gate and note position on log. <br />Reccrd amplified amplit•.:.e cn a SX scale Por low amplitudes. <br />Reccrd amplitude and travel time on the 7 foot receiver. <br />Reccrd travel ..ime cn ,~ '00 us rczle (I50 - 250, ~00 - 700). <br />Lagging speed should be approximately 70 ftJmin. <br />Log repeat sections. <br />PART IV - QUALITY CONTROL <br />compare the tool calibration data to see i! the tool <br />"drifts" during loagina. Differences in the calibration <br />data may require you to re-log the well to obtain reliable <br />data. <br />Compare repeat ~ecticns tc see if lagging results are <br />repeatable. <br />Chect: the longed free pipe travel times with the service <br />company charts far the specific tool and casing size used. <br />Since the travel times deaend on such factors as casing <br />weight, type of fluid in the hole, etc., these charts should <br />be used only as quideli.^.es. when you are confident of the <br />