Dump/stop valve for surface controller subsurface safety valve

Details Dump/stop valve for surface controller subsurface safety valve Dump/stop valve for surface controller subsurface safety valve

E - Fixed Constructions

21

B

E21B 34/10 (2006.01)

Patent

CA 2172477

A dump/stop valve used to close and open a surface controlled subsurface safety valve (SCSSV) and a surface safety valve (SSV). The dump/stop valve permits the SSV to close prior to the closure of the SCSSV to avoid wear and possible damage to the SCSSV. Likewise, the dump/stop valve permits the SCSSV to be opened prior to the SSV for the same reasons. A time delay is built into the dump/stop valve operation to provide for a predetermined time period between the closing of the SCSSV and closing of the stop valve to ensure all fluid is exhausted. The stop valve ensures that downhole fluid does not leak into the reservoir.

Cette invention concerne un ensemble soupape vide-vite/clapet de retenue servant à fermer et à ouvrir une soupape de sûreté souterraine commandée en surface (SSSCS) et une soupape de sûreté de surface (SSS). L'objet de l'invention permet à la soupape de sûreté de surface (SSS) de se fermer avant la SSSCS de manière à protéger celle-ci contre l'usure et des dommages éventuels. De même, l'objet de l'invention permet à la SSSCS de s'ouvrir avant la SSS aux mêmes fins. Le fonctionnement de l'ensemble soupape vide-vite/clapet de retenue est temporisé de manière à ménager un intervalle prédéterminé entre la fermeture de la SSSCS et sa propre fermeture pour faire en sorte que tout le liquide à évacuer l'est effectivement. Le clapet de retenue empêche tout liquide dans le puits de s'écouler dans le réservoir.

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