Jet dual bit

Details Jet dual bit Jet dual bit

1980-01-25

1981-10-06

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175215, E21B 910

Patent

active

042930480

ABSTRACT:
Dual flow passage drilling means includes a dual flow passage sub and a dual flow passage bit. The bit has a threaded tubular pin and a flat seal shoulder there around, adapted to make a rotary shouldered connection with a central box at the lower end of the sub.
The bit includes a cylindrical body with a central flow passage and three circumferentially spaced off-axial holes centered 120 degrees apart providing outer fluid passage means communicating through the bit shoulder with the sub's annulus. Beneath the body are earth formation reducing means, including three jet nozzles connected to the off-axial holes. The earth formation reducing means further includes three drilling cones rotatably mounted on three legs depending from the body. The legs are centered 120 degrees apart, for example midway between the nozzles. The diameter of the earth bore is determined by the locus of the outermost parts of the cones as the cones rotate at the bottom of the bore. The outer surfaces of the bit legs and sub are well within the bore diameter.
A belt around the bit body above the level of the earth formation reducing means has only a rotating clearance with the earth bore, thereby to seal the bore annulus and centralize the bit tending to keep the legs and sub out of contact with the earth bore. Detritus retention means in the form of single or double webs between the nozzles and legs, or braces between the legs, may be provided.

REFERENCES:
patent: 3329222 (1967-07-01), Neilson
patent: 3416617 (1968-12-01), Elenburg
patent: 3416618 (1968-12-01), Kunnemann
patent: 3419092 (1968-12-01), Elenburg
patent: 3542144 (1970-11-01), White
patent: 3596720 (1971-08-01), Elenburg
patent: 3712392 (1973-01-01), Dela Gorgendiere
patent: 3825083 (1974-07-01), Flarity
patent: 3833077 (1974-09-01), Lavallee
patent: 4185706 (1980-01-01), Baker
patent: 4189014 (1980-02-01), Allen et al.

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