Vacuum, vacuum-pressure, or pressure reverse circulation bit

Details Vacuum, vacuum-pressure, or pressure reverse circulation bit Vacuum, vacuum-pressure, or pressure reverse circulation bit

1975-02-18

1976-04-06

Murtagh, John E.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175213, 175215, E21B 908

Patent

active

039483304

ABSTRACT:
Drill cuttings are effectively removed from the bottom of a bore before they can adversely affect the operation of the bit. The bit includes a body member rotatably supporting individual cutter members. A shield means projects from the body member proximate the cutter members. A first portion of the shield means has an outside diameter substantially equal to the outside diameter of the cutter means and substantially equal to the diameter of the bore and a second portion having an outside diameter substantially less than the outside diameter of the cutter members and substantially less than the diameter of the bore. A first passage extending through the bit is adapted to provide communication with a vacuum source to assist in removing the drill cuttings. A second passage extending through the bit is adapted to provide communication with a gas pressure source to assist in removing the drill cuttings.

REFERENCES:
patent: 2234454 (1941-03-01), Richter
patent: 3292719 (1966-12-01), Schumacher
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: 3648788 (1972-03-01), McKinney

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