Lock open tool for downhole safety valve

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/14 (2006.01) E21B 29/08 (2006.01)

Patent

CA 2500706

A lock open device for a flapper is disclosed. The tool engages in the sub- surface safety valve (SSSV) body and rotates the flapper to the open position, without shifting the flow tube. The flapper base is preferably held by a shearable thread and has a groove for engagement by the tool. The tool jars down on the flapper base to shear the thread and force the held open flapper into a retaining groove. Optionally, a penetrating tool can be connected so that, in a single trip, the flapper can be locked open and the pressurized control system can be accessed. Shearing the thread allows the flow tube spring to bias the held open flapper into its retaining groove.

L'invention porte sur un dispositif bloqué à l'état ouvert destiné à un clapet. L'outil vient en contact avec le corps de la vanne de sécurité de subsurface et fait tourner le clapet pour amener celui-ci en position ouverte, sans déplacer le tube d'écoulement. La base du clapet est de préférence maintenue par application d'un cisaillement sur un filetage et comporte une gorge permettant l'engagement de l'outil. L'outil effectue un repêchage sur la base du clapet pour appliquer un cisaillement sur le filetage et pousser le clapet maintenu ouvert dans une gorge de retenue. Un outil de pénétration peut éventuellement être aussi raccordé de manière que, en un seul déplacement, le clapet puisse être bloqué à l'état ouvert, ce qui permet aussi d'accéder au système de commande sous pression. Le cisaillement appliqué au filetage permet au ressort du tube d'écoulement de solliciter le clapet maintenu ouvert dans sa gorge de retenue.

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