دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a 1. special device placed in a string of tubing that can be operated by a wireline tool to open or close orifices to permit circulation between the tubing and the annulus. It may also be used to open or shut off production from various intervals in a well. Also called circulation sleeve, slidingsleeve nipple. 2. a device in a packer that prevents fluid from flowing from the tubing into the annulus.

a downhole piece of equipment in a tubing string that allows flow from annulus to tubing. Usually opened and closed by wireline.