Failsafe subsurface controlled safety valve
AssigneeWeatherford Technology Holdings, LLC
InventorGary Benjamin LAKE
Life of this patent
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Abstract
Embodiments of the invention generally relate to a failsafe subsurface controlled safety valve. In one embodiment, a failsafe subsurface controlled safety valve assembly includes: a tubular housing; a closure member disposed in the tubular housing, wherein the closure member is movable between a closed position and an open position; an operating piston operable to move the closure member between the closed position and the open position; and a trigger piston operable to move the closure member from the open position to the closed position.
Claims24
A failsafe subsurface controlled safety valve assembly comprising:
- a tubular housing;
- a closure member disposed in the tubular housing, wherein the closure member is movable between a closed position and an open position;
- an operating piston operable to move the closure member between the closed position and the open position;
- and
- a trigger piston operable to move the closure member from the open position to the closed position.
A failsafe subsurface controlled safety valve assembly comprising:
- a tubular housing;
- a closure member disposed in the tubular housing, wherein the closure member is movable between a closed position and an open position;
- a trigger piston operable to move the closure member from the open position to the closed position;
- and
- a trigger assembly operable to actuate the trigger piston, wherein the trigger assembly is in fluid communication with a bore of the tubular housing.
A method for controlling fluid flow in a tubular housing of a subsurface safety valve, comprising:
- supplying pressure to the tubular housing to actuate an operating piston, thereby moving an opener from an upper position to a lower position;
- moving a closure member from a closed position to an open position in response to moving the opener to the lower position;
- maintaining pressure in the tubular housing to retain the closure member in the open position;
- actuating a trigger piston, thereby moving the opener from the lower position to the upper position;
- and
- closing the closure member in response to moving the opener to the upper position.
Dependencies are inferred from the claim text.