Rotary drill bit for casting milling and formation drilling

Details Rotary drill bit for casting milling and formation drilling Rotary drill bit for casting milling and formation drilling

2006-04-11

2006-04-11

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C166S055100, C175S431000

Reexamination Certificate

active

07025156

ABSTRACT:
A rotary drill bit is used both for milling a casing window and drilling a lateral borehole into subterranean earthen materials, without the prior need of having separate drill bits for milling of the casing and for drilling of the borehole. The rotary drill bit is lowered into a casing set within a borehole; and the drill bit is rotated to engage an inner surface of the casing. A first set of cutting elements on the drill bit remove casing material to mill a casing window. The drill bit is then moved through the casing window so that a second set of cutting elements on the drill bit create a lateral wellbore in subterranean earthen material.

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