Nozzle insert for rotary rock bit

Details Nozzle insert for rotary rock bit Nozzle insert for rotary rock bit

1996-07-03

1998-07-07

Bagnell, David J.

Boring or penetrating the earth

Miscellaneous

239489, 239601, E21B 1018

Patent

active

057754462

ABSTRACT:
A nozzle insert for a rotary rock bit has an orifice with a generally circular central region and a plurality of angularly spaced, non-circular outer regions around the periphery thereof so that flow of mud through each outer region develops a vortex pattern that increases entrainment of rock particles to prevent bit balling, and decreases overbalance pressure to enhance rate of penetration.

REFERENCES:
patent: 3275248 (1966-09-01), O'Brien et al.
patent: 4687066 (1987-08-01), Evans
patent: 5494124 (1996-02-01), Dove et al.
patent: 5495903 (1996-03-01), Griffin et al.
patent: 5632349 (1997-05-01), Dove et al.

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