Patent Number: 6,167,833

Title: Wear indicator for rotary drilling tools

Abstract: A wear indicator is provided for a rotary drilling tool of the type which comprises a bit body having a leading surface for cutting, abrading or reaming a hole in a target substrate material such as a sub-surface formation, the wear indicator comprising or including one or more discrete areas of a visually distinct material to that from which the drilling tool is mainly composed, the visually distinct material being arranged or configured at or adjacent the surface of the bit such that progressive wear of the bit and hence the or each visually distinct discrete area provides a visual indication of surface wear of the tool.

Inventors: Caraway; Douglas Bruce (Kingwood, TX), Watts; Tony Martin (Houston, TX), Patton; Douglas Alan (Houston, TX), Nguyen; David Martin (Houston, TX)

Assignee: Camco International Inc.

International Classification: E21B 12/00 (20060101); E21B 12/02 (20060101); G01D 021/00 (); E21B 012/02 (); E21B 012/04 ()

Expiration Date: 01/02/2018