Labyrinth lock seal for hydrostatically set packer

Details Labyrinth lock seal for hydrostatically set packer Labyrinth lock seal for hydrostatically set packer

E - Fixed Constructions

21

B

E21B 33/1295 (2006.01)

Patent

CA 2454948

A hydrostatically set packer is disclosed. The actuating piston (18) is locked for run in by a lock sleeve (32) and lock dog (48) arrangement. When the desired depth is reached well pressure is built up to break a rupture disc (42) to allow hydrostatic pressure to act on one side of a lock sleeve. The other side of the lock sleeve is exposed to a chamber (36) under atmospheric or low pressure. Movement of the lock sleeve releases the lock dog allowing piston movement to set the packer. The lock sleeve has a labyrinth seal (L) so that seal leakage below a predetermined level will not prematurely activate the piston lock and prematurely set the packer. A variety of designs for the labyrinth are described-

L'invention concerne une garniture définie hydrostatiquement. Le piston de commande (18) est bloqué par un manchon de blocage (32) et un agencement taquet de blocage (48). Lorsque la profondeur souhaitée est atteinte, la pression du puits rompt un disque de rupture (42) afin de permettre à la pression hydrostatique d'agir sur un côté du manchon de blocage. L'autre côté du manchon de blocage est exposé à une chambre (36) sous pression atmosphérique ou sous faible pression. Le mouvement du manchon de blocage libère le taquet de blocage permettant au piston de se déplacer pour fixer la garniture. Le manchon de blocage présente un joint labyrinthe L de manière qu'une fuite inférieure à un niveau prédéterminé ne va pas actionner de manière prématurée le blocage du piston ni fixer prématurément la garniture. Une grande variété de motifs font également l'objet de cette invention.

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