Inflatable downhole seal

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/127 (2006.01)

Patent

CA 2280963

The invention relates to a downhole seal (10) of the balloon type, formed to sealingly bear, in use, by its outer circumferential surface on, for example, the inner shell surface of a production riser (12). To prevent that the pressure inside the inflated seal, because of temperature variations, either gets so high that the seal (10) bursts, or so low that the seal (10) loosens and loses or reduces its effect, the seal (10) has a thereto connected pressure compensator (16), which is arranged to adjust the internal pressure of the inflated seal (10) in relation to the pressure of the surroundings on the underside/downstream of the seal, which will thus make a true reference pressure for the internal pressure of the seal (10). By increasing pressure inside the inflated seal (10) the ambient pressure permits a leakage of the liquid/gaseous inflating medium of the seal to maintain a largely constant internal pressure in the seal (10), whereas by a falling pressure inside the seal (10), the ambient pressure causes it to rise by supplying additional inflating medium from a reservoir (26), to maintain the pressure desired for the seal (10).

L'invention concerne un joint (10) de fond du type sphérique, formé pour porter de manière étanche, lorsqu'il est en service, par exemple, sur la surface de la coque interne d'un tube (12) ascenseur de production, et ce, au moyen de sa surface périphérique externe. En vue d'empêcher que la pression à l'intérieur du joint gonflé, pression provoquée par les variations de température, devienne, soit si forte que le joint (10) éclate, soit si faible que le joint (10) devienne moins étanche et perde son efficacité ou ait moins d'efficacité, le joint (10) est connecté à un compensateur (16) de pression conçu pour régler la pression interne du joint (10) gonflé en fonction de la pression de l'environnement au niveau du fond/en aval du joint, ce qui permet d'établir une pression de référence réelle pour la pression interne du joint (10). En augmentant la pression à l'intérieur du joint (10) gonflé, la pression ambiante permet une fuite du milieu de gonflement liquide/gazeux du joint dans le but de maintenir une pression interne sensiblement constante dans le joint (10). Au contraire, lors d'une diminution de la pression à l'intérieur du joint (10), la pression ambiante le fait se gonfler par apport d'un milieu de gonflement supplémentaire provenant d'un réservoir (26), en vue de maintenir la pression souhaitée du joint (10).

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