Resettable Float Valve Selection Mechanism
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Solution Overview
Problem
Typical float valves in subterranean well operations have a non-resettable auto-fill feature, limiting their ability to automatically fill the casing string with fluid multiple times during installation, which restricts operational flexibility and efficiency in cementing and other well operations.
Innovation Solution
A resettable float valve with a selection mechanism that allows actuation between open and closed configurations based on flow rates, enabling multiple cycles of auto-fill and preventing backflow of cement into the casing string, utilizing a closure device biased by a spring and a profile engagement mechanism for selective flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a float valve has a non-resettable auto-fill feature, then the valve can fill the casing string with fluid during installation, but the valve cannot perform multiple fill cycles and lacks operational flexibility
Solution Approach 1:
The float valve incorporates a selection mechanism with movable selection member that can be dynamically positioned in different states (first state for auto-fill, second state for preventing backflow). This dynamic configurability allows the valve to switch between different operational modes, enabling multiple fill cycles and improving adaptability without requiring multiple separate valves
Solution Approach 2:
The float valve is designed to perform multiple functions through a single integrated mechanism: it can automatically fill the casing string during installation, prevent cement backflow during cementing operations, and be reset for subsequent operations. The selection mechanism enables one valve to replace what would traditionally require multiple specialized valves, enhancing versatility
2Productivity
If a float valve allows fluid to flow into the casing string during installation, then the casing string is automatically filled, but cement can flow back into the casing string during cementing operations
Solution Approach 1:
The float valve uses a dynamic selection mechanism that can change the flow path configuration based on operational needs. During installation, the selection member allows fluid flow into the casing string for automatic filling. During cementing, the selection member is positioned to close the passage, preventing cement backflow while maintaining the float valve's one-way prevention function
Solution Approach 2:
The selection mechanism acts as an intermediary control element between the float valve and the casing string. It mediates the flow path by providing a controllable passage that can be opened or closed based on the operational phase, thereby controlling when fluid can enter the casing string and when backflow is prevented
3Ease of operation
If the auto-fill feature is activated, then fluid can flow through the valve into the casing string, but the valve cannot prevent this flow during cementing operations
Solution Approach 1:
The selection mechanism provides dynamic control over the auto-fill feature through a movable selection member. In the first state, the passage is open allowing automatic filling during installation. In the second state, the passage is closed preventing any flow during cementing operations. This dynamic switching ensures reliable flow control appropriate for each operational phase
Solution Approach 2:
The float valve incorporates a float mechanism that provides automatic feedback control. The float responds to fluid level changes in the casing string and automatically actuates the valve to maintain proper fluid levels during installation. During cementing, the selection mechanism overrides this by closing the passage, ensuring reliable prevention of cement entry regardless of float position
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
The resettable auto-fill feature enhances operational flexibility and efficiency by allowing multiple cycles of fluid flow into and out of the casing string, ensuring cement remains in the annulus for hardening while preventing reverse flow, thereby improving well cementing operations.
Implementation Method 1
A closure device is biased by a spring toward a seat
Implementation Method 2
The float valve prevents the cement from flowing back into the casing string
Data Source
AI summary
A float valve can include a selection mechanism having an open configuration in which flow into and out of the valve is permitted, and a closed configuration in which flow out of the valve is permitted and flow into the valve is prevented. The selection mechanism can be actuated from the closed configuration to the open configuration. A method of actuating a float valve can include actuating the valve from a closed configuration in which flow into the valve is prevented but flow out of the valve is permitted, to an open configuration in which flow into and out of the valve is permitted. The valve can actuate from the open configuration to the closed configuration, and from the closed to the open configuration, in response to a flow rate through the valve being greater than a predetermined level.