Nutating drill bit

Details Nutating drill bit Nutating drill bit

1977-08-08

1979-09-25

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175215, 175 60, 175372, 175403, E21B 908

Patent

active

041687558

ABSTRACT:
A nutating earth drilling bit which is adapted for use in drilling systems in which the drilling fluid and cuttings are transported from bit to surface through the interior of the drill string. The nutating bit is provided with a toroidal cutting member and a longitudinally extending annular shank, both of which have longitudinally extending passageways aligned with one another and in flow communication with the central return conduit of the drill string. The cutting member of one embodiment has a segmented cutting web at its lower end which divides the central passageway into three separate fluid return channels. Another embodiment drills an annular hole face around an uncut earth core, the core being permitted to rise into the shank member where it is broken into short segments by a core breaker.

REFERENCES:
patent: 1087632 (1914-02-01), Benjamin
patent: 1945240 (1934-01-01), Tupica
patent: 2013838 (1935-09-01), Pickin
patent: 2025261 (1935-12-01), Zublin
patent: 2362860 (1944-11-01), Rossman
patent: 2598518 (1952-05-01), Dufilho
patent: 3338322 (1967-08-01), Henderson
patent: 3429390 (1969-02-01), Bennett
patent: 3616868 (1970-01-01), Bassinger
patent: 3941196 (1976-03-01), Curington et al.
patent: 4057118 (1977-11-01), Ford

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