Boring or penetrating the earth – With bit wear signal generating
Patent
1989-02-22
1990-03-27
Dang, Hoang C.
Boring or penetrating the earth
With bit wear signal generating
E21B 1202
Patent
active
049112520
ABSTRACT:
This invention relates to a method and apparatus for detecting excessive displacement of rotating cutter cones on rotary rock bits used in earth boring. The apparatus causes a detectable pressure change in the pressurized drilling fluid system triggered by a pre-determined displacement of a cone from its normal position. This is accomplished by penetration of a sensor by the displaced cone. In the simplest form the penetrated sensor forms an additional exit port for the drilling fluid thereby reducing pressure. In another embodiment the intact sensor maintains a nozzle restricting object in position within the bit body by a hydraulically actuated retainer penetration of the sensor permits loss of the hydraulic fluid and release of the restricting object which then restricts an exit port causing an immediate pressure increase.
REFERENCES:
patent: 2560328 (1951-07-01), Bielstein
patent: 3058532 (1962-10-01), Alder
patent: 3363702 (1968-01-01), Bielstein
patent: 3678883 (1972-07-01), Fischer
patent: 3853184 (1974-12-01), McCullough
patent: 4610313 (1986-09-01), Daly et al.
patent: 4655300 (1987-04-01), Davis, Jr. et al.
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