Reaming tool suitable for running on casing or liner

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion

Reexamination Certificate

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Details

C175S406000

Reexamination Certificate

active

07621351

ABSTRACT:
A reaming tool includes a tubular body having a nose portion with a concave center. A plurality of blades defining junk slots therebetween extend axially behind the nose and taper outwardly from the exterior of the tubular body. Rotationally leading edges of the blades carry a plurality of cutting elements from the axially leading ends. Selected surfaces and edges of the blades bear tungsten carbide, which may comprise crushed tungsten carbide. The shell of the nose is configured to ensure drillout from the centerline thereof toward the side wall of the tubular body. A method of drilling out a reaming tool is also disclosed.

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