Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent
1982-02-26
1984-02-14
Purser, Ernest R.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
175279, 175406, 175410, E21B 1032, E21B 1046
Patent
active
044310650
ABSTRACT:
An underreamer utilizes a plurality of cutting arms each having a plurality of tungsten carbide inserts, some of which have synthetic diamond cutting surfaces. There is a synthetic diamond gage cutter at the outer end of each cutting arm, and at least one other synthetic diamond cutter located more inwardly on the arm. The gage cutter is offset a greater distance from the leading side of the arm than are such other cutters. Recessed regions in front of the synthetic diamond cutters expose their full cutting faces while leaving steel for support of the cutters. Tungsten carbide inserts on the ends of the cutting arms between the leading side and the gage cutter minimize erosion of the steel arm and help prevent the gage cutter from being dislodged. The underreamer includes a hydraulic plunger for activating the cutting arms from a fully retracted to a fully deployed position, and a nozzle which ejects fluid toward the arm cutting surfaces during deployment and operation of the cutting arms.
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patent: 4334585 (1982-06-01), Upton
Neuder William P.
Purser Ernest R.
Smith International Inc.
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