دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a special tube installed in a string of tubing, having matching wireline tool with locking pawls. It is used to hold a regulator, choke, or safety valve;to anchor a pump;or to permit installation of gas lift valves. Also called a landing nipple.

a machined profile in a heavy wall short tubing section that allows a plug to be set and the seal on the plug to effectively isolate the well.