دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an elevator that is bored to match a square shouldered tool joint. collar locator n: a logging device used to determine accurately the depth of a well;the log measures and records the depth of each casing collar, or coupling, in a well. Since the length of each joint of casing is written down, along with the number of joints of casing that were put into the well, knowing the number and depth of the collars allows an accurate measure of well depth.