Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1977-04-13
1978-09-19
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175 67, 175317, 175231, E21B 908
Patent
active
041147057
ABSTRACT:
In rock drilling utilizing mechanical destruction of the rock and circulation of drilling fluid for removing debris from the cutting face, the drilling fluid is directed on to the cutting face in the form of two opposed pulsed jets, the cycles of which are 180.degree. out of phase. In order to achieve the phased opposition of the pulsed jets a ball is disposed in the distribution chamber of the drilling fluid and is subjected to a combination of hydraulic and mechanical forces which cause the ball to oscillate between two end positions in which the ball respectively closes off one of two outlet ducts leading to nozzles which direct the drilling fluid towards opposite points on the bottom of the drill hole.
REFERENCES:
patent: 2746721 (1956-05-01), Moore
patent: 2902258 (1959-09-01), Hildebrandt
patent: 3087558 (1963-04-01), Dougherty, Jr.
patent: 3138213 (1964-06-01), Brandon
patent: 3163240 (1964-12-01), Bodine
patent: 3216514 (1965-11-01), Nelson
patent: 3251424 (1966-05-01), Brooks
patent: 3315755 (1967-04-01), Brooks
patent: 3405770 (1968-10-01), Galle et al.
patent: 3488765 (1970-01-01), Anderson
patent: 3645346 (1972-02-01), Miller et al.
Favreau Richard E.
Purser Ernest R.
Societe B.V.S.
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