Boring or penetrating the earth – Bit or bit element – Adjustable cutter element
Reexamination Certificate
2006-11-07
2006-11-07
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Adjustable cutter element
C175S022000, C405S253000
Reexamination Certificate
active
07131505
ABSTRACT:
The present invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, with each casing string having a drill bit piece disposed at the lower end thereof. The drill bit pieces of adjacent casing strings are releasably connected to one another. In another aspect of the invention, a method is provided for setting concentric casing strings within a wellbore with the drilling system. In another aspect of the invention, the releasably connected drill bit pieces comprise a drill bit assembly.
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Brunnert David J.
Galloway Gregory G.
Bagnell David
Patterson & Sheridan L.L.P.
Stephenson Daniel P.
Weatherford / Lamb, Inc.
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