Rotary drill bit

Details Rotary drill bit Rotary drill bit

2008-01-15

2008-01-15

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

C175S336000, C175S378000

Reexamination Certificate

active

07318492

ABSTRACT:
A drill bit for drilling a borehole with a steerable drilling system, the drill bit comprising a longitudinal axis, and a cutting profile with a leading face section blended with a curved region into a tapered gauge region having a tapered gauge profile. The tapered gauge region being tapered with respect to the longitudinal axis determined by the steerable drilling system. The cutting profile and the gauge profile lie wholly within a bit profile envelope made up of a three dimensional surface of two complimentary conical sections set at the tilt angle and separated by and blended with a rounded section which forms an outermost diameter of the bit profile envelope. The rounded section has a diameter substantially equal to a maximum allowable API diameter for the drill bit, and further has a radius of curvature substantially equal to one-half the diameter.

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EP 05 25 5067, filed Aug. 17, 2005: Annex to the European Search Report; Applicant ReedHycalog UK Limited.

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