Under-reaming tool for boreholes

Details Under-reaming tool for boreholes Under-reaming tool for boreholes

1993-04-30

1994-11-29

Britts, Ramon S.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175291, 175406, E21B 1026

Patent

active

053681142

ABSTRACT:
An under-reaming tool for use in preferably horizontal and extended reach bore holes includes a succession of stabilizers, under-reamers and expandable stabilizers. A common drilling mud activator is provided for the expandable elements of under-reamers and expandable stabilizers. A preferred under-reaming device comprises a main body with a number of guiding surfaces distributed over the circumference thereof which have a pitch increasing radially in an axial direction and with a ring collar formed as a piston in a surrounding cylinder housing having a small and a large radial annular surface, and having reaming pads/wings and/or stabilizer pads/wings in sliding contact with a respective guiding surface, the pads being taken up in ports in a jacket surrounding the main body, in such a way that the pads can only be moved radially relative to the jacket, the jacket being attached to or formed as a part of the cylinder housing.

REFERENCES:
patent: 2754089 (1956-07-01), Kammerer, Jr.
patent: 3851719 (1974-12-01), Thompson et al.
patent: 4071101 (1978-01-01), Ford
patent: 4407376 (1983-10-01), Inoue
patent: 4458761 (1984-07-01), Van Vreeswyk
patent: 4589504 (1986-05-01), Simpson
patent: 4889197 (1989-12-01), Boe
patent: 5074356 (1991-12-01), Neff
patent: 5139098 (1992-08-01), Blake

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