Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate
2008-04-15
2010-10-19
Neuder, William P (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
C175S325100
Reexamination Certificate
active
07814996
ABSTRACT:
A spiral ribbed aluminum drillpipe has an intermediate portion with a plurality of ribs spiraling along its length. These ribs have active faces that are exposed by recessed areas. The active faces define incut angles relative to the pipe's outer surface for actively engaging slime/sediment material along a borehole wall. Bearings rotatably disposed on the pipe have a greater diameter than the ribbed intermediate portion or any tool joints on the drillpipe so that the bearings engage the borehole wall. The pipe's body is preferably composed of a lightweight alloy, such as aluminum alloy, whereas the bearings are preferably composed of steel and have wear resistant coating or bands.
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Basovich Vladimir S.
Indrupskiy David I.
Lubyanyy Dmitry A.
Aquatic Company
Loikith Catherine
Neuder William P
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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