Ball dropping assembly for wellbores

Details Ball dropping assembly for wellbores Ball dropping assembly for wellbores

E - Fixed Constructions

21

B

E21B 33/05 (2006.01) E21B 33/068 (2006.01) E21B 33/16 (2006.01) E21B 34/14 (2006.01)

Patent

CA 2445297

A ball dropping assembly (350) for dropping one or more objects, such as spherical balls, (5,5',5") into a wellbore (7). The assembly comprises a seat (330) for retaining a ball before it is released. The assembly may also comprise a ball feeding channel (380) for feeding additional balls onto the seat. A ball retaining lever (40) is provided to selectively receive and retain balls onto the seat (330), and then to release the balls individually into the wellbore (6). In one embodiment, the assembly is attached to a side bore (4) in fluid communication with a main bore in a cementing head (105). The ball-retaining lever (40) rotates into the bore (6) when releasing a ball (5'). When a plug (8) is released into the bore from a cementing head (105), the plug (8) will trip the lever (40), causing the ball-retaining lever to rotate back towards the ball-retained position. Thus, the ball dropping assembly also serves as a plug release indicator.

L'invention concerne un ensemble (350) de largage de boulets destin~ ~ larguer un ou plusieurs objets, tels que des boulets sph~riques, (5,5',5") dans un puits (7). L'ensemble comprend un si­ge (330) destin~ ~ retenir un boulet avant que celui-ci ne soit l~ch~. L'ensemble peut ~galement comprendre un canal (380) d'alimentation de boulets destin~ ~ alimenter le si­ge en boulets suppl~mentaires. Un levier (40) de retenue de boulet est destin~ ~ recevoir et ~ retenir de fa×on s~lective des boulets sur le si­ge (330), puis ~ l~cher les boulets individuellement dans le puits (6). Dans un mode de r~alisation, l'ensemble est rattach~ ~ un al~sage lat~ral (4) en communication fluidique avec un al~sage principal dans une tÚte (105) de cimentation. Le levier (40) de retenue de boulet tourne dans le puits (6) lorsqu'un boulet (5') est l~ch~. Lorsqu'un bouchon (8) est l~ch~ dans le puits d'une tÚte (105) de cimentation, le bouchon (8) d~clenche le levier (8), faisant tourner le levier de retenue de boulet vers l'arri­re sur la position de retenue de boulet. L'ensemble de largage de boulet sert ainsi ~galement d'indicateur de lib~ration d'un bouchon.

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