دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a solid cylindrical body pointed at the bottom and equipped with a tool joint at the top for connection with a jar. It is used to make an opening in a collapsed casing and drive it back to its original shape.

n: The tool of requiring casing with box thread at the top. The bottom presents pyramid.

a hardened steel tool, commonly run on wireline, which is used to reshape the casing.