Method and apparatus for detecting wear of a rotatable bit

Details Method and apparatus for detecting wear of a rotatable bit Method and apparatus for detecting wear of a rotatable bit

1985-09-26

1987-04-07

Novosad, Stephen J.

Boring or penetrating the earth

With bit wear signal generating

E21B 1202

Patent

active

046553002

ABSTRACT:
The present invention relates to a method and apparatus for detecting excessive wear of a rotatable bit used in drilling. In particular, the apparatus can detect loss of gauge or bearing failure in a bit. The method is accomplished by connecting a restricting means in the drill bit that can be manipulated to reduce the flow of drilling fluid through at least one port in the drill bit. A wire is connected between a sensor which senses wear and the restriction means to cause the restriction means to reduce the flow of drilling fluid and thereby signal the surface by the reduced flow as an indication of wear.

REFERENCES:
patent: 2560328 (1951-07-01), Bielstein
patent: 2925251 (1960-02-01), Arps
patent: 3062302 (1962-11-01), Toth et al.
patent: 3345867 (1967-10-01), Arps
patent: 3853184 (1974-12-01), McCullough

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