EdgeGuard Technical Paper

Roller Cone Bit Wear Resistance in Abrasive, High Angle, and Lateral Applications Addressed with Shirttail Protection Technology

Abstract

Complex wellbore geometries and abrasive formations impose much greater wear demands on roller cone drill bits and result in shorter bit life and reduced penetration rates. A technology has been developed to specifically protect vulnerable shirttail areas.

In abrasive, high angle, and lateral applications, a common dull mode is wear to the shirttail edge. When drilling curves and lateral applications, shirttail wear often leads to exposure and eventual failure of the seal or bearing.

This paper is the first published review of patented technology for the placement of hard, wear resistant pucks to vulnerable areas of the shirttail, including the leading and lower edges, of non-sealed and sealed bearing roller cone bits. Design, materials, and manufacturing aspects of bit development are discussed, and dull modes in abrasive, high angle, and lateral applications are examined and contrasted. Case history field data details performance in several applications.

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