Combination mill and drill bit

Details Combination mill and drill bit Combination mill and drill bit

1998-09-08

2000-10-17

Lillis, Eileen D.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175383, 175384, 175412, 166 551, E21B 2906

Patent

active

06131675&

ABSTRACT:
A combination milling and drilling bit which can be converted from a first type of cutting operation to a second type of cutting operation by hydraulically moving a plurality of movable blades to extend beyond a plurality of fixed blades. The fixed blades are dressed with cutting inserts suitable for the first type of cutting operation, while the movable blades are dressed with cutting inserts suitable for the second type of cutting operation.

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