Patent ID: 7654345
Filing Date: 2010-02-02
Classification: E21B

Abstract:
1. A wear resistant sub assembly for use with well boring equipment, comprising: a body with a body outer diameter, wherein the body comprises an end formed in the body, a locking portion and a seating groove; a sealing means disposed in the seating groove; a sleeve having a sleeve axis, an inner side and an outer side and wherein the sleeve outer diameter is larger than the body outer diameter, and wherein the sleeve slides into the seating groove with the sealing means; at least two spring locking apparatus disposed on the inner side removably engaging the locking portion of the body; a plurality of offset indentations formed on the outer side of the sleeve in rows of four to eight offset indentations along an angle sloping from about 7.5 degrees to about 45 degrees from the sleeve axis; and a metal carbide insert for each offset indentation, wherein the metal carbide inserts are interference fit into one of the offset indentations thereby forming a wear resistant sub assembly.