System for sealing a space in a wellbore

Details System for sealing a space in a wellbore System for sealing a space in a wellbore

E - Fixed Constructions

21

B

E21B 33/12 (2006.01)

Patent

CA 2533424

A system is provided for sealing a space (7) in a wellbore (1) formed in an earth formation (2). The system comprises a swelleable body (12) arranged in the wellbore in a manner so as to seal said space upon swelling of the swelleable body, the swelleable body being susceptible of being in contact with formation water (4) flowing into the wellbore, the swelleable body including a matrix material provided with a compound soluble in said formation water. The matrix material substantially prevents or restricts migration of the compound out of the swelleable body and allows migration of said formation water into the swelleable body by osmosis so as to induce swelling of the swelleable body upon migration of said formation water into the swelleable body.

La présente invention concerne un système qui permet d'étanchéiser un espace (7) dans un puits de forage (1) formé dans une formation de terrain (2). Le système comprend un corps gonflable (12) agencé dans le puits de forage de manière que ledit espace peut être étanchéisé par le gonflement du corps gonflable, le corps gonflable étant susceptible de se trouver en contact avec une eau (4) de formation s'écoulant dans le puits de forage, le corps gonflable comprenant un matériau matriciel muni d'un composé soluble dans l'eau de formation précitée. Le matériau matriciel empêche ou restreint sensiblement la migration du composé hors du corps gonflable, mais permet la migration par osmose de l'eau de formation précitée dans le corps gonflable de façon que le gonflement du corps gonflable est induit par la migration de l'eau de formation dans le corps gonflable.

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