Expander for expanding a tubular element

Wells – Expansible anchor or casing – Expansible casing

Reexamination Certificate

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Details

C166S206000

Reexamination Certificate

active

07117940

ABSTRACT:
An apparatus and method for expanding a wellbore tubular such as a casing is provided. The apparatus includes: an expandable casing; a drill string extending to within the drillstring; an expansion cone suspended from the drillstring, the expansion cone having an expanded state and a collapsed state and wherein the expansion cone is deformable to the expanded state and is relaxed in the collapsed state; a seal bushing capable of sealing an annulus between the drill string and the expandable casing; a downward expansion flow path wherein fluid communication is provided between the inside of the drill string and the annulus between the drill string and the expandable casing above the expansion cone; and an upward expansion flow path wherein fluid communication is provided between the inside of the drill string and the inside of the expandable casing for upward expansion by the expansion cone.

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