Rotary drill bits with gage pads having improved...

Details Rotary drill bits with gage pads having improved... Rotary drill bits with gage pads having improved...

Filed on

2008-05-27

Date issued

2011-11-08

Examiner

Neuder, William P (Department: 3672)

Patent Class

Boring or penetrating the earth

SubClass

Processes

Other Related Categories

C175S408000

Type

Reexamination Certificate

Status

active

Patent number

08051923

Description

ABSTRACT:
A rotary drill bit having blades with gage pads disposed on exterior portions thereof to improve steerability of the rotary drill bit during formation of a directional wellbore without sacrifice of lateral stability. One or more of the gage pads may include radially tapered exterior portions and/or cut out portions to assist with reducing wear of the associated gage pad. For some applications, a rotary drill bit may be formed having blades with gage pads having a relatively uniform exterior surface. Hard facing material and/or buttons may be disposed on exterior portions of the gage pad to form a radially tapered portion to improve steerability, reduce wear of the gage pad and/or improve ability of the rotary drill to form a wellbore having a generally uniform inside diameter, particularly during directional drilling of the wellbore.

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International Search Report and Written Opinion; PCT/US2008/064862; pp. 10, Sep. 2, 2008.
Written Opinion; PCT/US2008/064862; 5 pages, Apr. 20, 2011.

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