Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1977-07-11
1978-11-21
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175 67, 175393, E21B 908
Patent
active
041261941
ABSTRACT:
A three cone rock bit includes an improved circulation system for drilling fluid which increases the horizontal flow vector of the fluid adjacent the bottom surface of the hole being drilled. A pair of nozzles, located near the hole perimeter and between adjacent pairs of drilling cones, inject drilling fluid at one side of the hole. An extended pickup tube terminating between the remaining pair of drilling cones and close to the bottom of the hole being drilled channels fluid from the bottom of the hole to the annulus between the hole and the drill string.
REFERENCES:
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patent: 2692117 (1954-10-01), Kucera et al.
patent: 2776115 (1957-01-01), Williams, Jr.
patent: 2885185 (1959-05-01), Sartor
patent: 3070182 (1962-12-01), Runte
patent: 3099324 (1963-07-01), Kucera et al.
patent: 3363706 (1968-01-01), Feenstra
patent: 3384191 (1968-05-01), Schumacher, Jr. et al.
patent: 3542144 (1970-11-01), White
patent: 3923109 (1975-12-01), Williams, Jr.
patent: 4022285 (1977-05-01), Frank
Favreau Richard E.
Purser Ernest R.
Smith International Inc.
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