Shear and seal system for subsea applications
AssigneeSchlumberger Technology Corporation
InventorOguzhan Guven
Life of this patent
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Abstract
A system and methodology facilitates utilization of a valve and a cutter both of which may be used in a subsea test tree. The valve comprises a ball element pivotably mounted in a housing and having an exterior surface and a passageway sized to receive a conveyance therethrough. The cutter also is located in the housing but at a position spaced from the ball element. The cutter is oriented for selective severing of the conveyance. Additionally, a seal system is positioned to act against a surface of the ball element.
Claims20
A system for use in a subsea test tree, comprising:
- a subsea test tree housing having a passageway sized to receive a conveyance therethrough;
- a cutter mounted along the passageway, the cutter comprising a plurality of cutter blades selectively movable into the passageway by a plurality of pistons at a shear location;
- a valve mounted along the passageway separate from the cutter, the valve being a ball valve having a ball with a ball passage sized to receive the conveyance therethrough;
- and
- a seal member positioned to seal against an outer surface of the ball when the ball is pivoted to a position closing off flow along the passageway, the distance between the seal and the shear location being less than 10 inches (25.4 cm).
A method of shutting in a well, comprising:
- positioning a valve along a flow path through a subsea test tree;
- providing the valve with a ball pivotable between open and closed positions with respect to the flow path;
- locating a cutter along the flow path to create a shear location for cutting of a conveyance positioned in the flow path and through the ball;
- and
- arranging a seal member to seal off the flow path by sealingly engaging the ball at a location less than 10 inches (25.4 cm) from the shear location.
A system, comprising:
- a valve comprising:
- a ball valve element rotatably mounted in a housing, the ball valve element having an exterior surface and a passageway sized to receive a conveyance therethrough;
- a cutter located in the housing at a position spaced from the ball valve element and oriented for selective severing of the conveyance;
- and
- a seal system positioned to act against a surface of the ball valve element.
Dependencies are inferred from the claim text.