Landing string
First Claim
Patent Images
1. A landing string, comprising:
- a valve having a valve member mounted within a flow path extending through the landing string; and
a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path,wherein the valve control system comprises a closing line for providing communication of pressure to the valve to facilitate closing of the valve member, and a control valve operable between a first control valve configuration in which the closing line is in communication with the valve and a second control valve configuration in which the closing line is isolated from the valve; and
a pilot line for communicating a pilot pressure which operates the control valve to move from its first control valve configuration to its second control valve configuration, and wherein relief of said pilot pressure from the pilot line permits the control valve to move from its second control valve configuration to its first control valve configuration;
wherein the valve control system is selectively reconfigurable prior to a failure event comprising relief of pilot pressure within the pilot line between;
a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation; and
a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation.
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Accused Products
Abstract
A landing string includes a valve having a valve member mounted within a flow path extending through the landing string, and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path. The valve control system is reconfigurable between a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation, and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation.
18 Citations
21 Claims
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1. A landing string, comprising:
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a valve having a valve member mounted within a flow path extending through the landing string; and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path, wherein the valve control system comprises a closing line for providing communication of pressure to the valve to facilitate closing of the valve member, and a control valve operable between a first control valve configuration in which the closing line is in communication with the valve and a second control valve configuration in which the closing line is isolated from the valve; and a pilot line for communicating a pilot pressure which operates the control valve to move from its first control valve configuration to its second control valve configuration, and wherein relief of said pilot pressure from the pilot line permits the control valve to move from its second control valve configuration to its first control valve configuration; wherein the valve control system is selectively reconfigurable prior to a failure event comprising relief of pilot pressure within the pilot line between; a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation; and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling a valve within a landing string which includes a flow path, a valve member mounted within the flow path, and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path, wherein the valve control system comprises a closing line for providing communication of pressure to the valve to facilitate closing of the valve member, and a control valve operable between a first control valve configuration and a second control valve configuration, the method comprising:
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providing a pilot charge in a pilot line to operate the control valve to move from a first control valve configuration in which the closing line is in communication with the valve to a second control valve configuration in which the closing line is isolated from the valve, wherein relief of the pilot pressure permits the control valve to move from its second control valve configuration to its first control valve configuration; and reconfiguring the valve control system prior to a failure event comprising relief of pilot pressure within the pilot line between; a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation; and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation. - View Dependent Claims (20)
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21. A landing string, comprising:
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a valve having a valve member mounted within a flow path extending through the landing string; and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path, wherein the valve control system comprises a closing line for providing communication of power to the valve to facilitate closing of the valve member, and a control valve operable between a first control valve configuration in which the closing line is in communication with the valve and a second control valve configuration in which the closing line is isolated from the valve, wherein the valve control system is selectively reconfigurable prior to a failure event between; a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation by not charging or preventing the closing line from being charged while the control valve is in its second control valve configuration; and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation by charging the closing line while the control valve is in its second control valve configuration.
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Specification