Drill bit porting system

Details Drill bit porting system Drill bit porting system

2008-07-23

2010-06-08

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S324000, C175S393000

Reexamination Certificate

active

07730975

ABSTRACT:
In one aspect of the present invention a drill bit has a jack element with a distal end extending beyond a working face. A porting mechanism within the bore comprises first and second discs contacting along a flat interface. The first disc is attached to a turbine which is adapted to rotate the first disc with respect to the second disc. The discs comprise a first set of ports adapted to align and misalign with each other as the first disc rotates. The first set of ports is adapted to route a drilling fluid to extend the jack element.

REFERENCES:
patent: 2735653 (1956-02-01), Bielstein
patent: 3105560 (1963-10-01), Zublin
patent: 3251424 (1966-05-01), Brooks
patent: 6089332 (2000-07-01), Barr et al.

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