Boring or penetrating the earth – With bit wear signal generating
Patent
1975-09-15
1977-06-21
Purser, Ernest R.
Boring or penetrating the earth
With bit wear signal generating
73151, 175 40, 175206, E21B 1300
Patent
active
040305589
ABSTRACT:
A method for determining the amount and character of rotary drilling bit wear without interruption of the drilling operation.
The method comprises flowing a drilling fluid through the borehole and around the bit with sufficient velocity to remove the formation and bit cuttings as well as dust and other fragments knocked or worn loose from the bit, placing a magnetic in close proximity to the recovered material such that a portion of the ferrous cuttings, fragments and dust are attracted to the surface of the magnet, removing the ferrous cuttings, fragments and dust from the magnet and examining them under an optical microscope to enable observation of their size, shape and color, and comparing the quantity, size, shape and color of the recovered ferrous material with the quantity, size, shape and color of ferrous cuttings, fragments and dust indicative of known conditions of bit wear.scale.
REFERENCES:
patent: 2792115 (1957-05-01), Medearis
patent: 2965406 (1960-12-01), LeBus, Sr.
patent: 2966059 (1960-12-01), Dower
patent: 3089724 (1963-05-01), Crooks
patent: 3498455 (1970-03-01), Kirby
A Method for the Study of Wear Particles in Lubricating Oil, Seifert et al., Wear 21 (1972).
Favreau Richard E.
Purser Ernest R.
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