EMERGENCY DISCONNECT ISOLATION VALVE
First Claim
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1. A system for disconnection in a drilling operation, comprising:
- a body having an interior volume and an outer surface, the body having a seal positioned in the interior volume and a valve positioned in the seal, the valve is rotatable between an open position and a closed position, the body having an actuator disposed on the outer surface of the body, and the actuator is interconnected the valve;
a shear sub at least partially covering the outer surface of the body, the shear sub having a slot and the actuator of the body is positionable in the slot; and
a shearing mechanism selectively interconnects the shear sub to the body and selectively disconnects the shear sub from the body when the shear sub is subjected to a predetermined shear force, wherein when the shear sub selectively disconnects from the body, the shear sub rotates the actuator as the actuator is removed from the slot of the shear sub to rotate the valve from the open position to the closed position.
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Abstract
An isolation valve system, method, and apparatus are provided that can isolate a wellbore and prevent fluids from exiting the well and prevent seawater from entering the well. The system can be a two-part design in some embodiments where a shear sub is selectively interconnected to a body via shearing screws. A sufficient force on the shear sub destroys the shearing screws and the shear sub is removed from the body. This movement rotates an actuator on the body, which in turn rotates a valve in the body to provide the isolating function during routine operation of a wellbore or during an emergency.
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Citations
20 Claims
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1. A system for disconnection in a drilling operation, comprising:
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a body having an interior volume and an outer surface, the body having a seal positioned in the interior volume and a valve positioned in the seal, the valve is rotatable between an open position and a closed position, the body having an actuator disposed on the outer surface of the body, and the actuator is interconnected the valve; a shear sub at least partially covering the outer surface of the body, the shear sub having a slot and the actuator of the body is positionable in the slot; and a shearing mechanism selectively interconnects the shear sub to the body and selectively disconnects the shear sub from the body when the shear sub is subjected to a predetermined shear force, wherein when the shear sub selectively disconnects from the body, the shear sub rotates the actuator as the actuator is removed from the slot of the shear sub to rotate the valve from the open position to the closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating an emergency disconnect isolation valve, comprising:
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providing a body having an interior volume, a valve positioned in the interior volume, and an actuator on an outer surface of the body, wherein the actuator is operably interconnected to the valve; positioning a shear sub over at least part of the outer surface of the body, and positioning the actuator in a slot of the shear sub; selectively interconnecting the shear sub to the body with a shear mechanism that is configured to shear apart when the shear sub is subjected to a predetermined shear force; applying the predetermined shear force to the shear sub so that the shear mechanism shears apart and the shear sub disconnects from the body along a longitudinal axis of the body; and rotating, by a catch of the shear sub, the actuator as the shear sub disconnects from the body to rotate the valve of the body from an open position to a closed position. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An isolation system for a borehole operation, comprising:
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an isolation valve having an element positioned between a first end and a second end of the isolation valve, wherein the element is rotatable between an open position and a closed position; a first enclosed volume proximate to the first end of the isolation valve; a second enclosed volume proximate to the second end of the isolation valve, wherein the element segregates the first enclosed volume and the second enclosed volume when the element is in the closed position, and a shaft of the element extends to a side surface of the isolation valve; an actuator having an element recess configured to operatively interconnect to the shaft of the element, wherein the actuator is configured to rotate the element between the open position and the closed position; and a first alignment feature and a second alignment feature positioned on the side surface of the isolation valve, wherein the first alignment feature and the second feature combine to align the actuator and the isolation valve and to align the shaft and the element recess. - View Dependent Claims (18, 19, 20)
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Specification