Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1975-07-31
1976-05-25
Abbott, Frank L.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175213, 175215, E21B 918
Patent
active
039586510
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 along the length of the bit is adapted to provide communication with a gas pressure source to assist in removing the drill cuttings. The second passage has a portion in communication with the first passage to provide a pressurized jet-assist to the vacuum removal of the drill cuttings.
REFERENCES:
patent: 1547461 (1925-07-01), Steele
patent: 2234454 (1941-03-01), Richter
patent: 3292719 (1966-12-01), Schumacher, Jr.
patent: 3416617 (1968-12-01), Elenburg
patent: 3416618 (1968-12-01), Kunnemann
patent: 3419092 (1968-12-01), Elenburg
patent: 3439757 (1969-04-01), Elenburg
patent: 3542144 (1970-11-01), White
patent: 3648788 (1972-03-01), McKinney
Abbott Frank L.
Dresser Industries Inc.
Favreau Richard E.
Johnson, Jr. William E.
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