Inward Sloping Flapper Sealing Surface for Downhole Valve
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Solution Overview
Problem
Existing downhole valves face challenges in achieving reliable fluid flow control and self-alignment due to orthogonal sealing surfaces, which can lead to inefficient sealing and increased lapping requirements.
Innovation Solution
The implementation of a flapper valve with inward sloping sealing surfaces, where the flapper and hard seat surfaces are angled inward along the full circumference, allowing for self-centering and reinforced sealing while permitting rotational freedom for lapping, enhancing the sealing efficiency and ease of alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If orthogonal sealing surfaces are used in downhole valves, then the structure is simple and easy to manufacture, but the sealing efficiency is poor and extensive lapping is required
Solution Approach 1:
The patent applies curvature to the sealing surfaces by using a revolved seat line that forms an inward slope angle relative to the valve centerline. This curved geometry allows the flapper sealing surface to naturally align with the hard seat sealing surface, improving sealing efficiency while reducing the need for extensive lapping operations.
Solution Approach 2:
The patent changes the geometric parameters of the sealing surfaces from orthogonal (90-degree) contacts to inclined surfaces with specific slope angles. The revolved seat line creates a controlled angle between the flapper sealing surface and the hard seat sealing surface, optimizing both sealing performance and manufacturing requirements.
2Reliability
If inward sloping sealing surfaces are implemented, then self-centering and sealing are reinforced, but the device complexity increases
Solution Approach 1:
The inward sloping sealing surfaces are designed to provide self-centering functionality. As the flapper closes against the hard seat, the inclined geometry automatically guides the flapper into proper alignment, reinforcing sealing reliability without requiring additional alignment mechanisms or complex control systems.
Solution Approach 2:
The revolved seat line creates a curved, three-dimensional sealing surface that provides both the inward slope for self-centering and the precise geometry for reliable sealing. This curved geometry achieves multiple functions (sealing, alignment, and load distribution) within a single structural feature, managing complexity efficiently.
3Productivity
If the flapper sealing surface slopes inward along the full circumference, then fluid flow control is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The revolved seat line generates a consistent curved geometry around the entire circumference of the flapper. This rotational symmetry ensures uniform inward sloping along the full sealing surface, improving fluid flow control by preventing eddies and dead zones while maintaining achievable manufacturing precision through standardized forming processes.
Solution Approach 2:
The revolved seat line geometry serves multiple functions simultaneously: it creates the inward slope for self-centering, defines the sealing surface profile for reliable sealing, and ensures uniform fluid flow distribution around the full circumference. This multi-functionality reduces the need for separate features and maintains manufacturing feasibility.
Data Source
AI summary
A device, such as a valve, includes a hard seat having an axial bore extending along a central axis. A flapper pivotally connected with the hard seat at a hinge axis and pivotal between an open position to allow flow through the bore and a closed position to block flow through the bore, the flapper having a flapper sealing surface that slopes inward toward the central axis along a full circumference of the flapper sealing surface and the hard seat having a hard sealing surface that slopes inward toward the central axis conforming to the flapper sealing surface and on which the flapper sealing surface bears when in the closed position.