Underreamer with revolving diamond cutter elements

Details Underreamer with revolving diamond cutter elements Underreamer with revolving diamond cutter elements

1988-06-16

1989-07-11

Neuder, William P.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175273, 175286, 175287, 175329, E21B 1032

Patent

active

048462900

ABSTRACT:
A sub-surface borehole underreamer is disclosed having freely rotatable precessing diamond cutters attached to extendable arms connected to the body of the underreamer. The diamond cutting face is skewed to a degree that tangential contact of the peripheral edge of the diamond cutter causes the rotating cutter to precess as the underreamer body is rotated by a drill string.

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patent: 4064951 (1977-12-01), Weber
patent: 4091883 (1978-05-01), Weber
patent: 4282941 (1981-08-01), Perkin
patent: 4282942 (1981-08-01), Longmore
patent: 4589504 (1986-05-01), Simpson

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