Wells – Means for perforating – weakening – bending or separating pipe...
Reexamination Certificate
2006-11-28
2006-11-28
Bagnell, David (Department: 3672)
Wells
Means for perforating, weakening, bending or separating pipe...
C166S216000, C166S381000, C072S370080
Reexamination Certificate
active
07140428
ABSTRACT:
A duplex expansion apparatus for expanding a wellbore tubular to two different diameters from an initial diameter is provided. The duplex expansion apparatus includes: a first diameter expansion cone that is, in a relaxed state, of a diameter less than the internal diameter and in an expanded state of a diameter greater than the internal diameter; a second diameter expansion cone that is, in a relaxed state, of a diameter less than the internal diameter and in an expanded state of a diameter greater than the diameter of the first diameter expansion cone in the expanded state; and an assembly mandrel that is capable of transferring both the first diameter expansion cone and the second diameter expansion cone into their expanded states.
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Bagnell David
Shell Oil Company
Stephenson Daniel P
Stiegel Rachael
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