Creation of a downhole seal

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 33/134 (2006.01)

Patent

CA 2439107

The present invention provides apparatus and methods for expanding tubulars in a wellbore. In one aspect, a process of sealing an annular area in a wellbore is provided in which a tubular (420a) having perforations (415) at a predetermined location and a sleeve (425) concentrically covering substantially all of the perforations is expanded into substantial contact with an inner diameter of a tubular (460), such as a casing or a liner. In another aspect, a process of sealing an annular area in a wellbore is provided in which a tubular having perforations at a predetermined location and a sleeve concentrically covering substantially all of the perforations is expanded into substantial contact with a junction between two tubulars, such as a liner and a casing, or between two liners.

La présente invention porte sur un appareil et sur des procédés d'extension de tubulaires dans un puits de forage. Selon une réalisation, on procède à l'obturation d'une zone annulaire d'un puits de forage dans lequel un tubulaire (420a) pourvu de perforations (415) à un endroit prédéterminé et un manchon (425) recouvrant de manière concentrique presque toutes les perforations se dilatent pour venir en contact avec un diamètre interne d'un tubulaire (460) tel qu'un tubage ou une chemise. Selon une autre réalisation, on procède à l'étanchéité d'une zone annulaire d'un puits de forage dans lequel un tubulaire pourvu de perforations à un endroit prédéterminé et un manchon recouvrant de manière concentrique presque toutes les perforations se dilatent pour venir en contact avec un raccordement entre deux tubulaires tels qu'une chemise et un tubage ou entre deux chemises.

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