collar locator log

collar locator log

[′käl·ər ′lō‚kād·ər ‚läg]
(petroleum engineering)
Down-hole nuclear-log measurement to locate drill-hole casing collars, usually for precise location of perforating points.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.