Patent ID: 7775291
Filing Date: 2010-08-17
Classification: E21B

Abstract:
1. A safety valve apparatus, comprising: a housing defining a bore and having a projection disposed in the bore, the projection having a port with a first end communicating with the bore; at least one locking dog disposed on the housing and movable relative to the housing between engaged and disengaged positions, the at least one locking dog in the engaged position engagable with an inner conduit wall surrounding the housing; a flapper rotatably disposed on the housing and movable relative to the bore between opened and closed positions; a first sleeve disposed within the bore above the projection and being mechanically movable between first and second locked positions, the first sleeve in the first locked position moving the at least one locking dog to the engaged position, the first sleeve in the second locked position permitting the at least one locking dog to move to the disengaged position; a piston disposed in the housing and hydraulically communicating with the port; and a second sleeve disposed within the bore below the projection, the second sleeve coupled to the piston, the piston disposed in a first annular space between the second sleeve and the housing, the second sleeve concealing the piston in the first annular space and being hydraulically movable between first and second positions via hydraulic communication of the port with the piston, the second sleeve in the first position moving the flapper to the opened position, the second sleeve in the second position permitting the flapper to move to the closed position.