Hydraulically releasable coupling

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/04 (2006.01) E21B 17/06 (2006.01)

Patent

CA 2245947

Hydraulically releasable coupling (1) of the kind arranged to releasably connect a tool to a coiled tube, and which coupling (1) is provided with two or more hydraulic channels (12, 14) and (13, 15), arranged to convey hydraulic fluid from hydraulic lines, arranged in the coiled tube, to the tool; and in which the coupling (1) is held in coupled position by a locking device (4) which is secured by means of an axially displaceable sleeve (6), which again is fixed in locking position by shear pins (11). The sleeve (6) is arranged to work as a sleeve-shaped hydraulic piston, the sleeve (6) being provided with annular seals (7, 8, 9) of different seal diameters, whereby the seals (7, 8, 9) define annular areas, each assigned to a hydraulic channel (12, 14) and (13, 15). The sleeve (6) is subjected to an axially acting force equalling the sum of the products of the pressure in each of the hydraulic channels and the thereto assigned annular area. The shear pins (11) are arranged to break, whenever both annular areas are subjected to hydraulic working pressure.

Raccordement (1) libérable hydrauliquement d'un type conçu pour raccorder momentanément un outil à un tube en serpentin. Ce raccord (1) comporte deux passages hydrauliques ou plus (12, 14 et 13, 15) conçus pour acheminer un fluide hydraulique depuis des conduites disposées dans le tube en serpentin jusqu'à l'outil. Le raccordement (1) est maintenu en position par un dispositif de verrouillage (4) qui est immobilisé par un manchon se déplaçant dans le sens axial (6), lequel est à son tour immobilisé en position de verrouillage par des goupilles de cisaillement (11). Le manchon (6) est conçu de manière à fonctionner comme un piston hydraulique revêtant une telle forme de manchon. Il comporte des joints d'étanchéité annulaires (7, 8, 9) de diamètres différents qui définissent des secteurs annulaires dont chacun correspond à un passage hydraulique (12, 14 et 13, 15). Le manchon est soumis à une force de déplacement axial qui est égal à la somme des produits de la pression de chacun des passages hydrauliques et du secteur annulaire correspondant. Les goupilles de cisaillement (11) sont conçues pour se rompre dans le cas où les deux secteurs annulaires sont soumis à une pression de travail hydraulique.

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