Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent
1990-11-21
1992-03-31
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
With fluid conduit lining or element
175399, 175400, 175408, 175426, E21B 1060, E21B 1056
Patent
active
050999346
ABSTRACT:
A rotary drill bit comprises a bit body having a shank for connection to a drill string and a passage for supplying drilling fluid to the face of the bit, which carries a plurality of polycrystalline diamond preform cutting elements. In order to reduce bit whirl, the cutting elements are so disposed as to apply a resultant lateral imbalance force to the bit as it rotates during drilling and the gauge of the bit body is provided with low friction bearing pads to transmit said resultant lateral force to the sides of the borehole. Each low friction bearing pad includes an outwardly facing cavity which is connected to the passage by a choked conduit so that, in use, drilling fluid under pressure is delivered to the cavity, which thereby acts as a low friction hydrostatic bearing surface.
REFERENCES:
patent: 2931630 (1960-04-01), Grady
patent: 3215215 (1965-11-01), Kellner
patent: 3455402 (1969-07-01), Tirospolsky
patent: 3908771 (1975-09-01), Garrett
patent: 3923109 (1975-12-01), Williams, Jr.
patent: 4463220 (1984-07-01), Gonzalez
patent: 4982802 (1991-01-01), Warren et al.
"Bit Whirl-A New Theory of PDC Bit Failure", paper No. SPE 15971, by J. F. Brett, T. M. Warren and S. M. Behr, Society of Petroleum Engineers, 64th Annual Technical Conference, San Antonio, Texas, Oct. 8-11, 1989.
"Development of a Whirl Resistant Bit", paper No. 19572, by T. M. Warren, Society of Petroleum Engineers, 64th Annual Technical Conference, San Antonio, Texas, Oct. 8-11, 1989.
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