Expandable drill bit

Details Expandable drill bit Expandable drill bit

2006-10-17

2008-08-12

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Plural cutter elements longitudinally relative movable into...

C175S263000

Reexamination Certificate

active

07410015

ABSTRACT:
An expandable drill bit comprises a body for mounting on a support string DS, a plurality of drill arms3A,3B,3C,3D,4A,4B,4C,4D coupled to the body and extending along a central longitudinal axis LL′, and at least one drill arm supporting cutting elements6A. The plurality of drill arms3A,3B,3C,3D,4A,4B,4C,4D are pivotable between a retracted configuration and an expanded configuration. The retracted configuration defines an expandable drill bit having a first cutting diameter D1. The expanded configuration defines an expandable drill bit having a second cutting diameter D2greater than the first cutting diameter. The drill arms3A,3B,3C,3D,4A,4B,4C,4D are driven from the retracted configuration into the expanded configuration when the expandable drill bit is rotated at a speed of rotation at least equal to a determined expanding speed of rotation.

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