Method and multi-purpose apparatus for control of fluid in...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/16 (2006.01) E21B 33/126 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2370186

A downhole apparatus is described as having an upper mandrel (320) shearably connected to a lower mandrel (360). A sleeve (300) is shearably connected within the lower mandrel (360). The operation of the apparatus involves dropping a first small diameter ball (70) from the earth's surface. The ball (70) travels through the upper mandrel (320) and settles into the sleeve (300). By increasing pump pressure at the earth's surface, the lower mandrel (360) is separated from the upper mandrel (320) by shearing. By further increasing the pump pressure, the lower mandrel (360) can be pumped down to the bottom of the tubular string against a float collar or other plug landing surface. When it is desired to separate the upper mandrel (320) from the tubular string, a second larger ball (68) is dropped from the earth's surface and is seated within the upper mandrel (320). By further increasing the pump pressure, the upper mandrel (320) is separated from the tubular string.

L'invention concerne un appareil de fond de trou doté d'un mandrin supérieur (320) accouplé par cisaillement à un mandrin inférieur (360). Un manchon (300) est raccordé par cisaillement dans le mandrin inférieur (360). Le fonctionnement de l'appareil est déclenché par la chute d'une balle d'un premier diamètre (70) de la surface de la terre. La balle (70) passe dans le mandrin supérieur (320) et s'enfonce dans le manchon (300). Sous l'effet de l'augmentation de la pression de pompage au niveau de la surface de la terre, le mandrin inférieur (360) est séparé du mandrin supérieur (320) par cisaillement. Sous l'effet de l'augmentation de la pression de pompage, le mandrin inférieur (360) peut être envoyé dans le fond du train de tiges tubulaires, contre un collier flottant ou une autre surface de réception formant bouchon. Lorsque l'on veut séparer le mandrin supérieur (320) du train de tiges, on fait tomber une deuxième balle plus grosse (68) depuis la surface de la terre, de sorte qu'elle se loge dans le mandrin supérieur (320). Sous l'effet d'une augmentation de la pression de pompage supérieure, le mandrin supérieur (320) est séparé du train de tiges tubulaires.

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