Downward and upward expansion with expandable cone

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 21/10 (2006.01) E21B 34/14 (2006.01)

Patent

CA 2559006

An apparatus and method for expanding a wellbore tubular such as a casing is provided. The apparatus includes: an expandable casing (101); a drill string (406); an expansion cone suspended from the drillstring, the expansion cone having an expanded state and a collapsed state and wherein the expansion cone (204) is deformable to the expanded state; a seal bushing (402) 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.

L'invention concerne un dispositif et un procédé destinés à élargir un élément tubulaire de puits de forage, tel qu'un tubage. Le dispositif comprend un tubage expansible (101), un train de tiges (406), un cône d'élargissement suspendu sur le train de tiges, ce cône d'élargissement présentant un état élargi et un état rétréci, ledit cône d'élargissement (204) pouvant être déformé de manière à présenter l'état élargi, une garniture d'étanchéité (402) permettant d'étanchéifier un espace annulaire entre le train de tiges et le tubage expansible, un passage d'élargissement vers le bas dans lequel une communication fluidique est assurée entre l'intérieur du train de tiges et l'espace annulaire entre le train de tiges et le tubage expansible situé au-dessus du cône d'élargissement, ainsi qu'un passage d'élargissement vers le haut dans lequel une communication fluidique est assurée entre l'intérieur du train de tiges et l'intérieur du tubage expansible en vue d'un élargissement vers le haut au moyen du cône d'élargissement.

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