Flapper Valve Curved Face Prevents Tool Sticking
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Solution Overview
Problem
In hydrocarbon drilling operations, flapper valves can cause logging tools to become stuck due to contact with the valve cover when retrieving tools through the valve, leading to delays and additional costs.
Innovation Solution
The flapper valve design includes a boss with a beveled edge on the valve cover that prevents contact with the logging tools, and a curved face that provides additional clearance to prevent wedging, reducing the likelihood of tools becoming stuck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring force is applied to bias the valve cover to the closed position, then the valve can effectively control back pressure and prevent fluid flow in the reverse direction, but the valve cover may contact logging tools and cause them to become stuck
Solution Approach 1:
The valve cover face is changed from a flat surface to a curved surface with a radius of curvature between 0.5 inches and 2 inches. This curvature creates a geometric profile that prevents logging tools from making contact with the valve cover, thereby eliminating the sticking problem while maintaining the valve's sealing effectiveness through proper positioning of the curved face relative to the valve body opening.
2Device complexity
If the valve cover is designed with a simple disc shape, then the device complexity is reduced and manufacturing is easier, but the valve cover cannot provide sufficient clearance to prevent tool wedging
Solution Approach 1:
A curved face is added to the valve cover with a specific radius of curvature (0.5-2 inches), creating a dome-like profile that provides geometric clearance for logging tools. This modification maintains relative structural simplicity while effectively preventing tool wedging between the valve cover and valve body.
Solution Approach 2:
The radius of curvature parameter of the valve cover face is optimized to be between 0.5 inches and 2 inches. This specific parameter range provides sufficient clearance to prevent tool contact while maintaining compact valve dimensions and avoiding excessive complexity in the valve cover design.
3Force
If the valve cover contacts the logging tools during retrieval, then the spring force can effectively seal the valve, but the tool becomes wedged against the valve body causing retrieval delays
Solution Approach 1:
The curved face profile (radius 0.5-2 inches) creates a geometric barrier that prevents logging tools from contacting the valve cover during retrieval operations. By eliminating contact between the tool and valve cover, the spring force can maintain sealing without causing tool wedging, thereby preventing retrieval delays and associated costs.
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 design significantly reduces the likelihood of logging tools becoming wedged or stuck between the valve cover and the valve body, minimizing delays and costs associated with stuck tools.
Implementation Method 1
a biasing element that applies a spring force to the valve cover to bias the valve cover to the closed position
Implementation Method 2
The valve cover includes a curved face and a beveled edge that provides clearance to prevent contact with the logging tools
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A flapper valve includes a valve body, a valve cover pivotally coupled to the valve body at a hinge between an open and closed position, and a biasing element biasing the valve cover to the closed position. The valve cover includes an interior face comprising a sealing surface and a boss including a face surrounded by a beveled edge joining the boss with the sealing surface.