Liner anchor for expandable casing strings

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 19/10 (2006.01) E21B 23/01 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2667347

Expandable casing has an expandable slip used for completion of a mono-diameter wellbore. The expandable casing is run through the upper casing and has an upper end that overlaps a lower end to form a fluid flow path between the expandable casing and the upper casing. The operator expands the overlapping portion of the expandable casing to an intermediate position, causing the expandable slip to anchor the expandable casing to the upper causing without blocking the flow path. Cement is then pumped up around the outside of the expandable casing and wellbore fluid displaced by the cement and excess cement are permitted to flow through the fluid flow path and up the upper casing. After sufficient cement is in place, the expandable casing is further expanded, compressing the expandable slip into to the inner wall of the upper casing and sealing off the fluid flow path.

Un tubage extensible possède un coin de retenue extensible utilisé pour terminer un trou de forage à un seul diamètre. Ce tubage extensible court à travers le tubage supérieur et possède une extrémité inférieure qui chevauche une extrémité inférieure de façon à former un trajet d'écoulement de fluide entre le tubage extensible et le tubage supérieur. L'opérateur déploie la partie chevauchante du tubage extensible à une position intermédiaire, entraînant l'ancrage par le coin de retenue du tubage extensible sur le tubage supérieur sans bloquer le trajet d'écoulement. Puis le ciment est pompé à la surface autour de l'extérieur du tubage extensible et le fluide du puits est déplacé par le ciment et le ciment excédentaire peut s'écouler à travers le trajet d'écoulement de fluide et remonter le tubage supérieur. Lorsque suffisamment de ciment est en place, le tubage extensible est à nouveau déployé, comprimant le coin de retenue extensible dans la paroi intérieure du tubage supérieur et colmatant le trajet d'écoulement de fluide.

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