دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to hoist the drill stem out of the wellbore to perform one of a number of operations, such as changing bits or taking a core, and so forth, and then to return the drill stem to the well bore.

the round trip of pulling the drill string from a well and returning it to bottom. Usually done to change or check the bit or to change the BHA.