Cutting means for drag drill bits

Details Cutting means for drag drill bits Cutting means for drag drill bits

1996-07-25

1998-03-31

Schoeppel, Roger J.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175393, 1754202, E21B 1026

Patent

active

057327840

ABSTRACT:
A drag rotary bit (10) has a bit body (12) with a center cutter element (34) for projecting from the bottom (22) of the bit body (12) at the axial center of the bit body (12). The center cutting element (34) has a pair of cutters (42) with cutting faces (46) thereon in opposed relation to each other. A pair of opposed relatively long blades (54) are mounted on the bottom (22) of the bit body (12) and extend across the entire bottom (22) of the bit body (12) to the center cutter (34) to divide the bottom (22) into two separate areas. A single nozzle (26) having a large diameter discharge port (28) is provided for each of the separate areas for cleaning the bottom of the hole and washing of the blades.

REFERENCES:
patent: 3773122 (1973-11-01), Chromy
patent: 3960223 (1976-06-01), Kleine
patent: 4275796 (1981-06-01), Kleine
patent: 4294319 (1981-10-01), Geerogen
patent: 4540056 (1985-09-01), Ohanlon
patent: 4729441 (1988-03-01), Peetz et al.
patent: 4765419 (1988-08-01), Scholz et al.
patent: 4819748 (1989-04-01), Truscott
patent: 5027912 (1991-07-01), Juergens

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