Bore hole enlarging arrangement and method

Details Bore hole enlarging arrangement and method Bore hole enlarging arrangement and method

1985-09-19

1986-09-30

Novosad, Stephen J.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175285, 175289, E21B 728

Patent

active

046142428

ABSTRACT:
A bore hole enlarging method and arrangement for connection with a rotary pipe string includes inner and outer body sections which form a body structure to provide a fluid flow path therethrough for communicating with piston and cylinder means formed between the body sections for receiving drilling fluid to effect telescopic movement between the body sections. Cutter arms are pivotally mounted on the inner body section and a cooperable support arrangement on the cutter arms and outer body section cooperate to expand or move the cutter arms outwardly of the body structure upon telescopic movement of the body sections in one relative direction and assist in attracting the cutter arms when desired.

REFERENCES:
patent: 2225165 (1940-12-01), Dunlap, Jr.
patent: 2457628 (1948-12-01), Baker
patent: 3171503 (1965-03-01), Shirley
patent: 3386521 (1968-06-01), Chadderdon et al.
patent: 4458761 (1984-07-01), Van Vreeswyk

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