Hydraulic Switching for Insert Safety Valve Bypass in Wellbores
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Solution Overview
Problem
Subsurface safety valves in wellbore operations are prone to damage, failure, and corrosion, leading to hydraulic line damage and operational inefficiencies, necessitating costly and time-consuming workover operations.
Innovation Solution
Mechanisms for transferring hydraulic regulation from a primary safety valve to an insert safety valve, allowing existing control and balance lines to be used for regulating the insert safety valve, thereby bypassing the failed primary valve without deploying new lines, and maintaining hydraulic control through mechanical switching mechanisms within the nipple or sub.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary safety valve is damaged or fails, then the wellbore system loses hydraulic control capability, but deploying new control lines is costly and time-consuming
Solution Approach 1:
The system pre-installs an insert safety valve within the nipple that can be activated before the primary valve fails completely. The transfer mechanism is pre-configured with switching means that can redirect hydraulic flow from the damaged primary valve to the insert valve, allowing continuous operation without immediate workover intervention.
Solution Approach 2:
The insert safety valve acts as an intermediary backup when the primary valve fails. The switching mechanism serves as a mediator to transfer hydraulic regulation from the failed primary valve to the insert valve, maintaining system control capability without requiring new control lines or extensive workover operations.
2Ease of operation
If control lines are damaged during placement or operation, then the safety valve becomes inoperative, but replacing lines requires expensive workover operations
Solution Approach 1:
The system pre-configures the insert safety valve and switching mechanism during initial installation, so that when control line damage occurs, the hydraulic regulation can be transferred to the insert valve without requiring new lines or complex workover operations to restore control capability.
3Reliability
If the primary safety valve becomes damaged due to corrosion or scaling, then the valve no longer functions properly, but replacement requires workover operations
Solution Approach 1:
The insert safety valve serves as an intermediary backup when the primary valve becomes damaged from corrosion or scaling. The switching mechanism transfers hydraulic regulation to the insert valve, maintaining production continuity without requiring workover operations to replace the damaged primary valve.
Solution Approach 2:
When the primary safety valve becomes non-functional due to corrosion or scaling, the system discards its use by transferring hydraulic control to the insert valve through the switching mechanism, allowing continued production without recovering or replacing the damaged primary valve through expensive workover operations.
4Productivity
If hydraulic regulation is transferred to an insert safety valve, then continuous production is maintained, but the system complexity increases with additional switching mechanisms
Solution Approach 1:
The insert safety valve is nested within the nipple structure, and the switching mechanism is integrated into the existing hydraulic system architecture. This nesting approach minimizes additional complexity by utilizing existing spaces and pathways rather than adding completely separate systems.
Solution Approach 2:
The switching mechanism is designed to handle multiple functions: transferring control from the primary valve to the insert valve, and potentially back again. This multi-functionality reduces the need for separate dedicated components for each transfer scenario, thereby limiting the increase in overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous wellbore fluid production by replacing the primary safety valve with an insert safety valve, reducing the need for expensive workover operations and maintaining hydraulic control using existing lines, thus ensuring operational efficiency.
Implementation Method 1
When sufficient hydraulic pressure is conveyed to a subsurface safety valve via the control line, the piston and rod assembly forces the flow tube downward
Implementation Method 2
A balance line, when present, can operate in a similar manner to a control line and can also be controlled from the earth's surface. A pressurized balance line tends to force a subsurface safety valve toward a closed position
Implementation Method 3
When the hydraulic pressure is removed from the control line, the flapper valve can return to its default, closed position using a biasing spring and/or downhole pressure
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
Wellbore systems containing a hydraulically regulated primary safety valve may have their hydraulic regulation transferred to an insert safety valve disposed in a nipple. Transfer of the hydraulic regulation may take place mechanically, such as through axial displacement of a sliding sleeve or by replacement of a hydraulic spool. Wellbore systems configured for axial displacement of a switching mechanism may comprise: a tubing string comprising a nipple and a primary safety valve, the primary safety valve being disposed in the tubing string above or below the nipple; a control line and a balance line in hydraulic communication with the primary safety valve and in latent hydraulic communication with an internal flow pathway within the nipple; and a switching mechanism that is axially displaceable to establish hydraulic communication between an insert safety valve positioned in a bore of the nipple and both the control line and the balance line.