Rotary drill bits having nozzles to enhance recirculation

Details Rotary drill bits having nozzles to enhance recirculation Rotary drill bits having nozzles to enhance recirculation

1996-04-24

1997-12-23

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175400, E21B 1018

Patent

active

056998686

ABSTRACT:
A rotary drill bit for drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, and a plurality of blades formed on the leading face of the bit body and extending outwardly away from the axis of the bit towards the gauge region so as to define a fluid flow channel between the leading edge of each blade and the trailing edge of the adjacent preceding blade. A plurality of cutting elements are mounted along the leading edge of each blade, and there is provided, in one or more of the channels, a main nozzle which directs fluid along the leading edge of one blade so as to clean and cool the cutting elements on it, and a subsidiary nozzle which is located and orientated so as to direct fluid along the trailing edge of the preceding blade in a direction opposite to the direction of flow from the main nozzle, so as to tend to enhance partial recirculation of fluid flow in the flow channel between the blades.

REFERENCES:
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patent: 2931630 (1960-04-01), Grady
patent: 4098363 (1978-07-01), Rohde et al.
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patent: 4606418 (1986-08-01), Thompson
patent: 4676324 (1987-06-01), Barr et al.
patent: 4697654 (1987-10-01), Barr et al.
patent: 4848489 (1989-07-01), Deane
patent: 4883136 (1989-11-01), Trujillo

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