دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a casing sub containing a seal bore and a left-handed thread;it is run as a crossover sub between casing sizes and to provide a tubing anchor.

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.