Counterboring device for wells

Details Counterboring device for wells Counterboring device for wells

1989-06-30

1990-12-11

Neuder, William P.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

E21B 1032

Patent

active

049763237

ABSTRACT:
A drill extension is inserted between the drill rod and the drill bit, the drill extension having extendible cutting devices to counterbore the hole drilled by the drill bit for receiving a casing. The cutting devices are flush with the outer surface of the drill extension when not in use, and are pivoted to be expanded by centrifugal force and water pressure when in use. The counterbore is sized to receive the outside diameter of the well casing; and, the cutting devices are retracted to pass up through the casing.

REFERENCES:
patent: 3799276 (1974-03-01), Matsushita et al.
patent: 4589504 (1986-05-01), Simpson
patent: 4809793 (1989-05-01), Hailey

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