Surface controlled formation isolation valve adapted for deployment of a desired length of a tool string in a wellbore
First Claim
1. An apparatus for building a desired length of tool string for downhole operations in a wellbore, comprising:
- a valve disposed between an upper section and a lower section of the wellbore, the valve adapted to move between a closed position to allow the tool string to be built in the upper section of the wellbore and an open position to allow the tool string to be lowered from the upper section of the wellbore through the valve to the lower section of the wellbore; and
a controller for opening and closing the valve comprising;
a valve manifold;
a gas reservoir; and
a flowline interconnecting the valve manifold and the gas reservoir to the valve.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus is disclosed for building a tool string uphole of any desired length prior to lowering that tool string downhole into a wellbore for the purpose of performing wellbore operations downhole during a single trip into the wellbore. The apparatus includes a valve disposed between an upper section and a lower section of the wellbore and adapted to open and to close, the upper section of the wellbore being isolated from the lower section of the wellbore when the valve is closed. The tool string of any desired length is built in the upper section of the wellbore when the valve is closed and the upper section of the wellbore is isolated from the lower section of the wellbore. The apparatus also includes a mandrel and piston, the valve being initially disposed in an open position and adapted to be changed from the open position to a closed position when the mandrel is shifted from one position to another position. An upper chamber communicates with a gas reservoir and a valve manifold at the surface. The manifold includes a slow bleed valve and a fast bleed valve disposed at the wellbore surface. A gas metering orifice separates the upper chamber from a lower chamber. The mandrel is shifted in one direction and the valve changes position when a gas is delivered from the surface of the wellbore to the upper chamber thereby moving the piston and the mandrel, the mandrel shifting in an opposite direction and the valve changing position again when the gas in the upper chamber leaks from the upper chamber to the fast bleed valve at the surface. The mandrel shifts in the one direction and the valve changes position again when the gas from the surface is delivered to the upper chamber. However, the mandrel does not shift in the opposite direction and the valve does not change position again when the gas in the upper chamber leaks from the upper chamber to the slow bleed valve at the surface.
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Citations
14 Claims
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1. An apparatus for building a desired length of tool string for downhole operations in a wellbore, comprising:
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a valve disposed between an upper section and a lower section of the wellbore, the valve adapted to move between a closed position to allow the tool string to be built in the upper section of the wellbore and an open position to allow the tool string to be lowered from the upper section of the wellbore through the valve to the lower section of the wellbore; and a controller for opening and closing the valve comprising; a valve manifold; a gas reservoir; and a flowline interconnecting the valve manifold and the gas reservoir to the valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a valve in a wellbore, comprising the steps of:
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moving a medium from a medium reservoir through a flowline and into an upper chamber of the valve; exerting a pressure by the medium against a piston of the valve and moving a mandrel in one direction in response thereto; metering the medium from the upper chamber through a metering orifice in the piston and into a lower chamber of the valve; operating said valve by changing a state of the valve from a first state to a second state in response to the movement of said mandrel in said one direction; exerting a pressure by the medium in said lower chamber against said piston; metering said medium from said lower chamber through said metering orifice into said upper chamber through said flowline and through a fast bleed valve; moving said mandrel in a direction opposite to said one direction; and operating said valve by changing said state of the valve from said second state to said first state in response to the movement of said mandrel in said direction opposite to said one direction.
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10. A system adapted for use in connection with wellbore operations, comprising:
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an outer housing; a mandrel enclosed by the outer housing and movable longitudinally within said outer housing; a piston on said mandrel and a metering orifice longitudinally disposed through said piston, said mandrel and said housing defining an upper chamber between the mandrel and the housing and one side of said piston, said mandrel and said housing defining a lower chamber between the mandrel and the housing and the other side of said piston; and a valve manifold and a flowline interconnecting said valve manifold to said upper chamber. - View Dependent Claims (11, 12)
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13. A method of building a tool string for performing downhole operations in the wellbore, comprising:
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providing a valve between an upper section and a lower section of the wellbore; closing the valve by moving a medium from the valve through a flowline into a fast bleed valve; building the tool string in the upper section of the wellbore when the valve is closed; opening the valve by moving the medium from a medium reservoir through the flowline into the valve; moving the tool string from the upper section through the valve into the lower section of the wellbore when the valve is open; and operating the tool string to perform a downhole operation in the lower section of the wellbore. - View Dependent Claims (14)
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Specification