Combined drill and underreamer tool

Details Combined drill and underreamer tool Combined drill and underreamer tool

1991-09-26

1992-08-18

Britts, Ramon S.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175334, 175339, E21B 1034

Patent

active

051390981

ABSTRACT:
A combined drill and underreamer tool capable of selectively drilling and underreaming a well hole on command, which includes a fluid distribution system wherein drilling mud under pressure is accumulated in a central chamber and from that central chamber a portion is distributed to the drill bit while another portion is distributed to the underreamer tool when that tool is operative, and, further, employing drilling mud under pressure to activate and deactivate the underreamer tool by selectively blocking and unblocking a fluid a passage thereto.

REFERENCES:
patent: 2941785 (1960-06-01), Kammerer
patent: 3126065 (1964-03-01), Chadderdon
patent: 3749187 (1973-07-01), Leathers
patent: 4660657 (1987-04-01), Furse et al.
patent: 4865137 (1989-09-01), Bailey et al.
patent: 5036921 (1991-08-01), Pittard et al.

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