Drill bit having diamond impregnated inserts primary cutting structure

US6394202B2 · kind B2 · utility

Assignee

• SMITH INTERNATIONAL, INC. · US

Inventors

• David Truax · Houston, US
• Thomas W. Oldham · Diemelstraße, US
• Carl Edward Penuel · Houston, US
• Duane R. Van Waes · Cypress, US

Key dates

• Filing date: Jun 30, 1999
• Grant date: May 28, 2002
• Expiry date: Jun 30, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2005/001
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An earth-boring bit comprises a bit body bit body in which are mounted a plurality of cutting structures inserts, wherein at least a portion of the cutting structures comprise diamond-impregnated inserts having a total thermal exposure of less than 25 minutes above 1500° F. The diamonds can be natural or synthetic diamond. The bit body itself may be diamond-impregnated, in which case it is preferred that the diamonds in the inserts make up at least 40% of the total diamond in the bit.