Well Valve Assembly With Damped Piston-Spool Actuation
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Solution Overview
Problem
Current well system valve technologies face challenges in efficiently controlling fluid flow and preventing 'water-hammer' due to rapid actuation between closed and open positions, which can lead to component damage and operational inefficiencies.
Innovation Solution
The design incorporates a piston and cage assembly with specific flow restrictions and pressure differentials, utilizing a ported piston and spool configuration to modulate fluid flow and prevent rapid pressure changes, ensuring controlled actuation and reduced risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid actuation between closed and open positions is used, then valve response speed is improved, but water-hammer damage and operational reliability deteriorate
Solution Approach 1:
The patent applies beforehand cushioning by introducing a damping mechanism with restricted flow paths and energy absorption features that are pre-configured in the valve assembly. This cushioning system is designed to activate during rapid actuation, absorbing the shock energy before it can cause water-hammer damage to components, thus allowing fast response while protecting against damage.
Solution Approach 2:
The patent uses an intermediary damping mechanism positioned between the actuation force and the valve closure action. This intermediary element modulates the pressure wave transmission, reducing the intensity of water-hammer effects while maintaining the rapid actuation capability, effectively mediating between speed and reliability requirements.
2Stress or pressure
If flow restriction is increased to prevent water-hammer, then pressure control is improved, but actuation time increases
Solution Approach 1:
The patent applies local quality by implementing flow restrictions at specific localized positions within the valve assembly rather than uniformly throughout. The damping mechanism includes strategically placed flow restrictors and restricted flow paths at critical locations where pressure wave generation occurs, providing effective pressure control without impeding overall actuation speed.
Solution Approach 2:
The patent employs dynamics by designing a damping mechanism that adaptively responds to pressure conditions. The flow restriction elements are configured to provide variable resistance based on pressure differential, allowing rapid actuation under normal conditions while automatically increasing resistance when pressure waves threaten to cause water-hammer, thus dynamically balancing pressure control and actuation time.
3Force
If piston area is increased to improve force control, then pressure differential effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the piston structure into multiple functional segments with different surface areas exposed to pressure differentials. This segmented configuration allows independent optimization of force control characteristics without requiring a completely complex piston design, achieving effective force control through modular area distribution.
Solution Approach 2:
The patent implements universality by designing the piston to serve multiple functions simultaneously: force generation, position sensing, and flow control. The multi-functional piston design achieves improved force control through pressure differential without proportionally increasing complexity, as the same structural elements perform multiple roles in the valve actuation system.
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
This configuration effectively controls valve actuation between closed and open positions, mitigating the risk of 'water-hammer' and enhancing operational stability and efficiency by gradually changing flow areas and applying pressure differentials.
Implementation Method 1
a first piston seal disposed in the outer surface of the piston and in sealing engagement with an inner surface of the bore
Implementation Method 2
fluid pressurization of the first housing port applies a pressure force against the first end of the piston in the first direction
Implementation Method 3
the fluid pressurization of the second housing port applies a pressure force against the first annular surface of the annular flange in the first direction, and a pressure force against the second annular surface of the annular flange in the second direction
Implementation Method 4
the first piston port is configured to provide a flow restriction on fluid flowing between the first and second chambers when the piston is displaced in the first and second directions
Implementation Method 5
This configuration effectively controls valve actuation between closed and open positions, mitigating the risk of 'water-hammer' and enhancing operational stability and efficiency by gradually changing flow areas and applying pressure differentials
Data Source
AI summary
A valve for a well system including a valve housing including a first housing port, a second housing port, and a bore, a piston received in the bore and including a first end, a second end, and an annular flange including a first annular surface and a second annular surface both of which are in fluid communication with the second housing port, a piston seal disposed in the outer surface of the piston and in sealing engagement with an inner surface of the bore, and a cage assembly that includes a cage including a bore, a first cage port, a second cage port, and a third cage port, and a spool disposed in the cage and coupled to the piston, the spool including a throughbore.