دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a tool used in drilling to smooth the wall of a well, enlarge the hole to the specified size, help stabilize the bit, straighten the wellbore if kinks or doglegs are encountered, and drill directionally. See ream.

n: a tool used in a BHA (q.v.) to stabilize the bit, remove dog-legs, or enlarge the hole size.

a hole enlargement tool to open up a open hole or a window through the casing.