Rotary drill bits with extended bearing surfaces

Details Rotary drill bits with extended bearing surfaces Rotary drill bits with extended bearing surfaces

1998-09-24

2000-10-10

Bagnell, David

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

E21B 1060

Patent

active

061291617

ABSTRACT:
A rotary drill bit comprises a bit body having a leading face and a gauge region, cutting elements mounted on the bit body, fluid channels extending outwardly across the leading face towards the gauge region, and nozzles for supplying fluid to the channels. At the outer end of each alternate channel, in the gauge region, is an outwardly facing junk slot which extends across only a part of the width of the channel, and a bearing surface which extends across the other part of the channel and bears against a wall of the borehole being drilled. In the channel, inwardly of the bearing surface, is an opening into an enclosed passage which passes internally through the bit body to an outlet. The bearing surfaces at the end of the channels increase the peripheral bearing surface area of the drill bit, thus improving stability, but fluid can still escape from all parts of each channel.

REFERENCES:
patent: 5794725 (1998-08-01), Trujillo et al.
patent: 5819860 (1998-10-01), Newton et al.
patent: 5967246 (1999-10-01), Caraway et al.

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