Downhole assembly and cutter assembly

Details Downhole assembly and cutter assembly Downhole assembly and cutter assembly

2010-08-02

2011-11-08

Stephenson, Daniel P (Department: 3676)

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

C175S320000

Reexamination Certificate

active

08051928

ABSTRACT:
This invention relates to a downhole assembly and to a cutter assembly, and in particular to a downhole assembly including an apparatus for breaking up large-scale material which is present behind a drill bit, and to a cutter assembly for use in such a downhole assembly. The downhole assembly is suitably for use in a drillstring, the downhole assembly comprising a drill bit, a sensitive component, and at least one rotatable set of cutter blades located between the drill bit and the sensitive component.

REFERENCES:
patent: 4793425 (1988-12-01), White
patent: 2002/0023782 (2002-02-01), Appleton et al.
patent: 2004/0026131 (2004-02-01), Boulet et al.
patent: 2004/0211570 (2004-10-01), Chen et al.

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