Flow-Actuated Pressure Equalization Valve for Downhole Tools
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Solution Overview
Problem
Existing equalization valves in downhole tool assemblies face challenges in being moved up and down the wellbore without surface intervention and are prone to premature actuation or closure due to fluid flow, especially in low-pressure wells, which can lead to debris-related tool malfunctions and immobility.
Innovation Solution
A pressure equalization valve that requires actuation by two different mechanisms, utilizing a telescopically coupled tubular system with a valve shuttle and ball that can be enabled or disabled based on fluid flow rates, allowing for controlled fluid communication between uphole and downhole sections, and can be opened or closed to manage pressure equalization without bleeding off pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure equalization valve is used to manage fluid pressures about a packer, then pressure equalization is achieved, but the valve may be prematurely actuated or closed due to fluid flow, leading to tool immobility
Solution Approach 1:
The valve is designed with a preliminary mechanical action requirement (axial movement of the tubular) before fluid flow can actuate it. This preliminary action sets the valve in a position where subsequent fluid flow will produce the desired opening action, preventing premature closure while ensuring reliable pressure equalization when needed.
Solution Approach 2:
The valve mechanism incorporates dynamic elements including a movable valve ball, spring-loaded valve seat, and telescopic tubular sections that can move axially. These dynamic components allow the valve to respond adaptively to both mechanical positioning and fluid flow conditions, preventing premature actuation while enabling reliable pressure equalization.
2Ease of operation
If the valve is actuated by fluid flow to open or close, then fluid communication is controlled, but the valve cannot be reliably moved up and down the wellbore without surface intervention
Solution Approach 1:
The valve combines two actuation methods into a single integrated mechanism: mechanical actuation through axial movement of the tubular and fluid flow actuation through the valve seat. This merging allows the valve to be operated from the surface by simple axial movement while also enabling automatic fluid communication control in response to flow conditions.
Solution Approach 2:
The valve serves multiple functions through its dual actuation capability: it can be mechanically positioned from the surface for controlled opening/closing, and it automatically responds to fluid flow for pressure equalization. This multi-functionality simplifies surface operation while maintaining sophisticated fluid control.
3Stress or pressure
If the valve remains closed to isolate pressure, then pressure differential is maintained, but debris accumulation can cause tool damage or jamming
Solution Approach 1:
The valve enables periodic opening and closing cycles. During treatment operations, it remains closed to maintain pressure differential. Between operations, it can be opened to allow fluid flow that carries debris away from the tool, preventing accumulation and jamming while preserving the pressure isolation capability when needed.
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 controlled movement of the downhole tool along the wellbore, prevents premature actuation or closure, and ensures safe operation by maintaining fluid communication or isolation based on fluid flow rates, reducing the risk of tool damage and improving tripping rates between zones.
Implementation Method 1
fluid flow greater than the threshold flow rate overcomes the biasing to move the shuttle from the uphole-biased position to a flow-extended position
Implementation Method 2
the shuttle biased uphole to an uphole-biased position
Data Source
AI summary
A flow-actuated pressure equalization valve, for use with a downhole tool such as a treatment tool, for use in stimulating a subterranean formation. The equalization valve allows the pressure of treatment fluid above and below an isolation device to be equalized so the treatment tool can be moved. The valve can be closed when fluid flow exceeds a certain threshold and the treatment tool is set in the wellbore. While running in or pulling out of hole, the valve will not close regardless of the rate of fluid flow. The valve can be opened by stopping fluid flow and then bleeding off pressure above the isolation device, or by pulling up on the treatment tool.