Formation isolation valve
AssigneeSchlumberger Technology Corporation
InventorDinesh R. Patel
Life of this patent
Estimating the term…
Abstract
An assembly that is usable in a subterranean well includes a valve, a sleeve and an index mechanism. The valve is adapted to selectively isolate a region of the well, and the sleeve is adapted to be moved by a downhole tool to cause the valve to transition from a first state to a second state. The index mechanism prevents the valve from transitioning from the first state to the second state until after a position of the sleeve follows a predefined pattern.
Claims49
An assembly usable in a subterranean well, comprising:
- a valve adapted to selectively isolate a region of the well;
- a sleeve adapted to be moved by a downhole tool to cause the valve to transition from a first state to a second state, the downhole tool being part of a string that is separate from the valve;
- and
- an index mechanism to prevent the valve from transitioning from the first state to the second state until after a position of the sleeve follows a predefined pattern.
A method comprising:
- using a valve to isolate a region of a subterranean well;
- moving a sleeve with a downhole tool to cause the valve to transition from a first state to a second state, the downhole tool being part of a string that is separate from the valve;
- and
- preventing the valve from transitioning from the first state to the second state until after a position of the sleeve follows a predefined pattern.
An assembly comprising:
- a valve adapted to transition between first and second states;
- a first index mechanism functionally connected to the valve to prevent the valve from transitioning from the first state to the second state;
- and
- a second index mechanism separate from the first index mechanism and functionally connected to the valve to prevent the valve from transitioning from the second state to the first state.
A method comprising:
- running a valve open into a wellbore;
- shifting a tool that is part of a string that is separate from the valve a predetermined number of times to close the valve;
- and
- increasing a pressure inside a tubing bore a predetermined number of times to open the valve.
A system usable with a subterranean well, comprising:
- a tubular string;
- a port closure sleeve being part of the tubular string to selectively control fluid between an inner passageway of the string and a region outside of the string;
- a valve being part of the string and adapted to selectively isolate a region of the well, the valve being located between the port closure sleeve and the surface of the well;
- a second sleeve adapted to be moved by a downhole tool to cause the valve to transition from a first state to a second state, the downhole tool being part of a string that is separate from the valve;
- and
- an index mechanism to prevent the valve from transitioning from the first state to the second state until after a position of the second sleeve follows a predefined pattern.
Dependencies are inferred from the claim text.