PDC drag bit with improved hydraulics

Details PDC drag bit with improved hydraulics PDC drag bit with improved hydraulics

1993-05-10

1994-11-15

Buiz, Michael Powell

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175429, E21B 1060

Patent

active

053639324

ABSTRACT:
A drag bit for soft, sticky formations is disclosed with a new fluid dynamics control mechanism that minimizes "bit-balling". Multiple blades carrying PDC cutters have tapered back sides to achieve greater velocity through the fluid channels. Multiple jet nozzles in each fluid channel create interacting vortices that produce extremely turbulent flow thereby minimizing the coagulation and deposition of the hydrated clay cuttings on the bit cutting surfaces.

REFERENCES:
patent: 4606418 (1986-08-01), Thompson
patent: 4667756 (1987-05-01), King et al.
patent: 4676324 (1987-06-01), Barr et al.
patent: 4733735 (1988-03-01), Barr et al.
patent: 4776411 (1988-10-01), Jones
patent: 4794994 (1989-01-01), Deane et al.
patent: 4848489 (1989-07-01), Deane
patent: 4883132 (1989-11-01), Tibbitts
patent: 5033560 (1991-07-01), Sawyer et al.

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