Downhole ball dropping apparatus

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/06 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2655469

A ball dropping apparatus, comprises a housing having an uphole end and a downhole end and a passage through it, at least one obstructing member mounted in the housing, the obstructing member selectively movable from an initial position where it is located outside of the passage downwardly toward the downhole end to an obstructing position in the passage where it will prevent flow toward the downhole end, the obstructing member in the initial position being disposed in a side compartment selectively accessible to the passage, and a selectively movable carrier to hold the obstructing member in the side compartment, in a first position, and to allow release of the obstructing member from the side compartment, when placed in a second position, the carrier being biased in a direction where the obstructing member will be allowed to exit the side compartment, the carrier being initially secured to the housing with the bias overcome.

Appareil de largage comprenant un boîtier muni d'un trou supérieur et d'un trou inférieur et d'un conduit situé entre ces deux trous. Au moins un élément d'obstruction est monté dans le boîtier. On peut déplacer cet élément et le faire passer d'une position initiale, où il se trouve à l'extérieur du conduit, vers le bas et le trou inférieur, à une position d'obstruction, dans le conduit, où il empêche tout passage vers le trou inférieur, l'élément d'obstruction à la position initiale étant placé dans un compartiment latéral pouvant déboucher sur le conduit. Le dispositif comprend également un transporteur amovible qui sert à maintenir l'élément d'obstruction dans le compartiment latéral, dans une première position, et à libérer l'élément d'obstruction pour qu'il sorte du compartiment latéral, quand il est placé dans une deuxième position, le transporteur étant incliné dans un sens où l'élément d'obstruction peut sortir du compartiment latéral et étant d'abord fixé au boîtier avec une compensation de la poussée d'écartement.

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