Apparatus for detecting drill bit wear

Details Apparatus for detecting drill bit wear Apparatus for detecting drill bit wear

1988-03-10

1988-11-22

Novosad, Stephen J.

Boring or penetrating the earth

With bit wear signal generating

E21B 1202

Patent

active

047858940

ABSTRACT:
An earth drilling bit incorporating a bit wear indicator. The bit wear indicator includes: a sensor to detect wear at a selected point on the bit; a device for altering the resistance of the bit to receiving drilling fluid from the drill string; and, a tensioned linkage extending between the wear sensor and the flow resistance altering means. On detecting a predetermined degree of wear, the wear sensor releases the tension in the tensioned linkage. This activates the flow resistance altering device, causing the flow rate and/or pumping pressure of the drilling fluid to change. This serves as a signal that the predetermined wear condition has been achieved. The bit wear indicator can be adapted to monitor many different types of bit wear, including bearing wear in roller-cone type bits and gauge wear in all types of bits.

REFERENCES:
patent: 2239106 (1941-04-01), Krall
patent: 2560328 (1951-07-01), Bielstein
patent: 2580860 (1952-01-01), Stokes
patent: 2925251 (1960-02-01), Arps
patent: 3011566 (1961-12-01), Graham
patent: 3062302 (1962-11-01), Toth et al.
patent: 3345867 (1967-10-01), Arps
patent: 3363702 (1968-01-01), Bielstein
patent: 3853184 (1974-12-01), McCullough
patent: 4655300 (1987-04-01), Davis et al.

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