دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device that holds the lower end of a tubing string in place by means of slips, used to prevent tubing movement when no packer is present.

n: It fasten the oil pipe in the casing ,which can decrease the stroke loss in the process of mechnical production.

a packer-like device without seals that keeps the tubing from moving. Common in rod pumped wells.