Downhole Isolation Valve With Valve Rod for Shunt Tube Shutoff
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Solution Overview
Problem
Existing gravel packing systems lack an effective mechanism to isolate shunt tubes after completion, allowing unwanted fluids like gas to migrate uphole, which can cause operational inefficiencies and potential damage.
Innovation Solution
An isolation valve with a valve body and a moveable valve rod that can transition between open and closed positions to isolate or communicate flow paths, featuring a compact design suitable for downhole use and erosion resistance, with a varying flow area to mitigate damage from high-velocity mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shunt tubes are left open to permit fluid flow during gravel packing operation, then productivity is improved, but unwanted fluids can migrate uphole causing operational inefficiencies and potential damage
Solution Approach 1:
The shunt tube system incorporates a valve mechanism that transitions from a static open state to a dynamic controlled state. The valve rod can move between open and closed positions, allowing the system to adapt its flow characteristics based on operational requirements. This dynamic capability enables the shunt tubes to remain open during gravel packing for productivity while being closable to prevent unwanted fluid migration afterward.
2Object-generated harmful factors
If a valve mechanism is added to isolate shunt tubes after completion, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The valve mechanism is segmented into distinct functional components: a valve rod for flow control, a valve body for structural support, and sealing elements for isolation. This segmentation allows each component to perform its specific function efficiently while simplifying the overall design and maintenance of the complex valve system.
Solution Approach 2:
The valve rod is disposed within the valve body, creating a nested configuration where the moving valve rod fits inside the stationary valve body structure. This nesting arrangement compactly houses the valve mechanism within the existing shunt tube infrastructure, reducing space requirements and minimizing additional complexity while still providing effective flow isolation capability.
3Device complexity
If valve rod is disposed within the valve body wall, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The valve rod and valve body are designed as integrated components where the valve rod is disposed within the valve body wall structure. This merging of components eliminates the need for separate mounting structures and reduces the number of assembly steps. The integrated design simplifies the overall device structure while the precision is maintained through careful design of the valve rod's positioning features within the valve body.
Data Source
AI summary
An isolation valve has a valve body, which is mountable on or integrally formed with a tubular and which defines a valve pocket. A first flow path portion extends within the valve body between a tube inlet (connectable to an inlet tube) and a valve inlet port (in communication with the valve pocket). A second flow path portion extends within the valve body between a valve outlet port (in communication with the valve pocket) and a tube outlet (connectable to an outlet tube). A valve rod is disposed within the valve pocket of the valve body. The valve rod is moveable within the valve pocket between an open position (in which the valve inlet port and valve outlet port are in communication with each other) and a closed position (in which the valve inlet port and the valve outlet port are isolated from each other).