TYPES OF SUB COLLARS - AN OVERVIEW

types of sub collars - An Overview

A Totco ring will not be a sub but is bundled here for comfort. A little insert is positioned In the drill string concerning a pin in addition to a box connection.What exactly I would like to do is return to Individuals roots, speak about the origins of collars, their types, the best way to use them in scenes and security problems. FOR EDUCATIONAL

read more