Balanced area safety valve

Details Balanced area safety valve Balanced area safety valve

E - Fixed Constructions

21

B

166/44

E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1162145

BALANCED AREA SAFETY VALVE Abstract of the Disclosure A single line surface controlled, subsurface safety valve, adapted for connection in a well tubing string. The safety valve has a closure means disposed in the bore of the safety valve housing and is operable by action of control pressure fluid causing a longitudinal operator to move the closure means to an open to flow position. The control pressure fluid cham- ber in the safety valve is protected from well pressure by providing annular areas, between the longitudinal operator and the housing, positioned between the control pressure fluid chamber and well pressure. The annular areas are sealed from exposure to well pressure and are in fluid communication with each other. A floating piston is positioned to respond to well pressure entering the annular areas and thus move to engage and assist the operator means in closing the safety valve to flow of well fluids therethrough. Vent means is provided to prevent a hydraulic lock from retarding movement of the floating piston.

382233

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