Underreamer with debris flushing flow path

Details Underreamer with debris flushing flow path Underreamer with debris flushing flow path

1981-12-10

1983-08-30

Novosad, Stephen J.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175237, E21B 1018, E21B 1034

Patent

active

044011717

ABSTRACT:
An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The underreamer includes a central wash pipe for delivering drilling mud to remove cuttings and debris from the hole during drilling and an alternate flow path, generally through the body for delivering drilling fluid to the vicinity between the arm and the body to flush debris therefrom which would prevent the arms from retracting to their normal position for withdrawal from the borehole.

REFERENCES:
patent: 1839767 (1932-01-01), Lopez
patent: 1899727 (1933-02-01), Sandstone
patent: 2238377 (1941-04-01), Strang
patent: 3483934 (1969-12-01), Fuchs
patent: 3750771 (1973-08-01), Cugini

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