Anti-swabbing well tool assembly

Details Anti-swabbing well tool assembly Anti-swabbing well tool assembly

E - Fixed Constructions

21

B

E21B 43/10 (2006.01) E21B 43/04 (2006.01)

Patent

CA 2617074

An anti-swabbing well tool assembly comprises a tubular mandrel having an axial bore therein and a flapper seat within the bore. A flapper has a pivotal attachment to the mandrel for rotation onto the seat. The flapper has a structural projection therefrom by which the flapper is held from the seat against a spring bias. A sliding sleeve is assembled coaxially around the mandrel. The sleeve has a latch device for meshing with the flapper projection to hold the flapper from the seat against the spring bias. A selectively sheared fastener secures the sleeve at a relative axial position whereat the latch device is meshed with the flapper projection. A collet assembly is coaxially around the mandrel to bear upon the sleeve for selectively shearing the fastener.

Ensemble d'outil de puits anti-pistonnage qui comprend un mandrin tubulaire présentant un alésage axial dans celui-ci et un siège à clapet à l'intérieur de l'alésage. Un clapet présente une fixation pivotante sur le mandrin en rotation sur le siège. Le clapet présente une projection structurale par laquelle le clapet du siège est maintenu en sollicitant un ressort. On assemble un manchon coulissant de façon coaxiale autour du mandrin. Le manchon comporte un dispositif de verrouillage destiné à s'engrener avec la projection à clapet afin de maintenir le clapet du siège contre la force du ressort. Un élément de fixation sélectivement cisaillé permet de fixer le manchon au niveau d'une position axiale relative, où le dispositif de verrouillage est en prise avec la projection à clapet. Un ensemble douille enveloppe de manière coaxiale le mandrin pour prendre appui sur le manchon afin de cisailler sélectivement l'élément de fixation.

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