Drill bit having angled nozzles for improved bit and well bore c

Details Drill bit having angled nozzles for improved bit and well bore c Drill bit having angled nozzles for improved bit and well bore c

1982-11-01

1985-05-14

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

E21B 1018

Patent

active

045166420

ABSTRACT:
A rotary drill bit comprising a bit body having a chamber therein adapted to receive drilling fluid under pressure, a plurality of nozzles in communication with the chamber for exit of the drilling fluid, and a plurality of depending legs at its lower end, each having a bearing journal. The bit further includes a plurality of roller cutters, one for each leg, each cutter comprising a generally conical cutter body rotatably mounted on the bearing journal of the respective leg, and a plurality of cutting elements thereon. Each nozzle has an orifice in a position below the top of an adjacent roller cutter but above the central axis of the respective bearing journal at its inner end with respect to the bit body. In addition, each nozzle directs the fluid to flow in the direction opposite the direction of rotation of the bit, with the flow being generally tangent to the cutter body of the adjacent roller cutter, and thereafter impinging portions of the bottom of the well bore immediately forward of the adjacent roller cutter, whereby the drilling fluid cleans these portions of the well bore bottom and the cutting elements immediately prior to their engagement for enhanced drill bit cutting action.

REFERENCES:
patent: 1922436 (1933-08-01), Herrington
patent: 2098758 (1937-11-01), Reed
patent: 2244617 (1941-06-01), Hannum
patent: 2815936 (1957-12-01), Peter et al.
patent: 3984158 (1976-10-01), Sorensen et al.
patent: 4106577 (1978-08-01), Summers
patent: 4187920 (1980-02-01), Johnson
patent: 4222447 (1980-09-01), Cholet
patent: 4239087 (1980-12-01), Castel et al.

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