Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent
1997-02-13
1998-11-03
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
With fluid conduit lining or element
761084, E21B 1060, B21K 502
Patent
active
058295399
ABSTRACT:
A rotary drill bit, for drilling holes in subsurface formations, comprises a bit body, cutting structures mounted on the bit body, and a fluid supply system for supplying drilling fluid to the surface of the bit body, to cool and clean the cutting structures. The fluid supply system comprises a number of nozzles mounted in the bit body, a main passage in the bit body and a number of auxiliary passages leading from the main passage to the nozzles. Some or all of the passages are at least partly lined with an erosion-resistant lining material. The lining material may comprise a hard facing applied to the internal surface of a preformed passage or a rigid tube which itself defines the internal surface of the passage.
REFERENCES:
patent: 3112803 (1963-12-01), Rowley
patent: 3180440 (1965-04-01), Bridwell
patent: 3298451 (1967-01-01), Eckel et al.
patent: 4083417 (1978-04-01), Arnold
patent: 4630692 (1986-12-01), Ecer
patent: 4640711 (1987-02-01), Lichti et al.
patent: 4685359 (1987-08-01), Worthen et al.
patent: 5072796 (1991-12-01), Shen et al.
Barnes Michael
Caraway Douglas
Deane John
Lamb Haydn
Murdock Andrew
Bagnell David J.
Camco Drilling Group Limited
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