Junk sub is a short section of pipe that is located just above a bit or mill on a drillstring and is designed to catch large junk fragments in an outer bowl. Eddies in the circulating drilling mud cause the fragments to fall into the bowl. A junk sub is always run with mills and whenever drilling metal or cement. As many as three junk subs can be run on a string. Junk subs can have either long or short barrels. A junk sub is in contrast to a junk basket that uses reverse circulation and catches the fish on the inside of the tool.

Sé el primero en comentar

Dejar una contestacion

Tu dirección de correo electrónico no será publicada.