A downhole actuator including a sealing bellows

E - Fixed Constructions – 21 – B

Patent

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E21B 34/06 (2006.01)

Patent

CA 2365693

An actuator (14) designed to remain without maintenance down a well for a prolonged period includes at least one sealing bellows (44) and, preferably, a compensation bellows (46), between the fluid in the well and an internal chamber (30) filled with hydraulic fluid. The bellows (44, 46) make it possible either to omit dynamic elastomer gaskets or to protect them from the environment. The actuator (14) which is, for example, of the electromechanical type, may in particular drive an adjustable-aperture valve (12). The two bellows (44, 46) are advantageously made of stainless steel. They may be mounted either end-to-end, or else be totally dissociated.

Cette invention concerne un actionneur (14) qui est conçu pour rester pour une longue durée et sans entretien aucun au fond d'un puits de forage. Cet actionneur comprend au moins un soufflet d'étanchéité (44) et, de préférence, un soufflet de compensation (46) qui sont disposés entre le fluide contenu dans le puits et une chambre interne (30) remplie d'un fluide hydraulique. Les soufflets (44, 46) permettent ainsi de se passer de joints élastomères dynamiques ou, encore, de les protéger contre le milieu environnant. Cet actionneur (14), qui peut être par exemple de type électromécanique, permet notamment d'actionner une valve à ouverture réglable (12). Les deux soufflets (44, 46) sont avantageusement faits d'acier inoxydable. Ils peuvent être montés bout-en-bout ou, encore, être complètement dissociés.

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