دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a tool containing a spring-loaded finger, or dog, that pops out when the tool reaches the bottom end of the tubing string. The extended dog prevents the tool from being raised back into the tubing, thus indicating to an operator on the surface that the bottom of the tubing has been reached. The tool is removed from the tubing by jarring upward with enough force to shear a brass pin and allow the dog to rotate downward and into a slot in the body of the tubing end locator.

a wireline device that indicates when the end of tubing is reached.