Wellhead isolation tool and method of use

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/03 (2006.01) E21B 33/068 (2006.01) E21B 34/02 (2006.01)

Patent

CA 2077167

A wellhead isolation tool is disclosed that is unique because the tool has no direct connection between the high pressure valve and the mandrel. Well stimulation fluids are pumped through one or more high pressure bores which communicate with a mandrel injection head that directs the fluids into the mandrel. The injection head and the mandrel are enclosed in a sealed bore and reciprocatably movable with a piston which is used to stroke the mandrel into and out of a wellhead ant to lock the mandrel in an operating position wherein ports in the injection heat are aligned with the high pressure bores. The tool provides superior safety features and ease of operation.

Cette invention concerne un outil d'isolement de tête de puits unique en son genre du fait qu'il n'y a aucun raccordement direct entre la vanne haute pression et le mandrin. Des fluides de stimulation de puits sont pompés par un ou plusieurs ajutages haute pression qui communiquent avec un tête d'injection qui dirige lesdits fluides dans le mandrin. La tête d'injection et le mandrin se trouvent dans un alésage scellé où ils peuvent se déplacer en va-et-vient avec un piston servant à pousser ledit mandrin dans la tête de puits et à l'en sortir ainsi qu'à le verrouiller en position opérante où les lumières de la tête d'injection sont alignées avec les ajutages haute pression susmentionnés. Cet outil offre des caractéristiques supérieures de sûreté et de facilité d'utilisation.

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