Alternative method to cementing casing and liners

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/14 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2514967

A method of sealing casing or liners in a wellbore is described. The stands of casing or liner (16) receive a jacket (18) bonded to the outer surface. Preferably, the jacket is a rubber compound bonded to the outer wall. The formulation responds to well fluids to swell at a predetermined rate. The casing or liner can also be expanded with a swage preferably prior to the onset of significant jacket swelling. Packers and sealing hangers can be optionally added at the extremes of the casing or liner string to further secure against channeling between adjacent formations.

L'invention concerne un procédé destiné à étanchéifier un tubage ou des colonnes perdues dans un puits de forage. Les supports du tubage ou de la colonne perdue reçoivent un jacket lié à la surface extérieure. De préférence, le jacket est constitué d'un composé de caoutchouc lié à la paroi extérieure. La préparation réagit aux fluides de forage à une vitesse prédéterminée. Le tubage ou le liner peut également être dilaté au moyen d'un redresse-tubes, de préférence avant le début d'un gonflement important du jacket. Des garnitures d'étanchéité et des supports d'étanchéité peuvent éventuellement être ajoutés au niveau des extrémités de la colonne de tubage ou de la colonne perdue en vue d'une protection supplémentaire contre le cheminement préférentiel entre des formations adjacentes.

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