دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the last string of casing set in a well. 2. the string of casing that is set at the top of or through the producing zone, often called the oil string or production casing.

in a side-by-side dual completion, the tubing string that connects the deeper zone to the surface.