Selectively Activated Float Valve for Reverse Cementing
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Solution Overview
Problem
Current back pressure valves for production wells lack the ability to be reactivated after initial activation, limiting their functionality in reverse cementing applications, as they can only change flow direction mechanically and remain in a fixed open configuration.
Innovation Solution
A valve design featuring a valve collar, index piston, detent, and spring that allows for longitudinal translation between closed, flow-open, and locked-open configurations, enabling the valve to be manipulated between these states through fluid circulation, allowing for repeated activation and deactivation without mechanical intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical valve manipulation system is used to change flow direction, then flow control capability is improved, but the valve cannot be reactivated after initial activation
Solution Approach 1:
The valve transitions from a static mechanical configuration to a dynamic system that can cycle between closed and open states. The index piston with detent mechanism allows the valve to be manipulated between configurations and reactivated as needed, providing ongoing adaptability rather than a fixed single-use configuration.
Solution Approach 2:
The valve system uses fluid circulation pressure to automatically manipulate the valve to an open configuration and spring force to automatically return it to closed configuration, eliminating the need for continuous mechanical intervention and enabling repeated activation cycles.
2Adaptability or versatility
If a spring-biased index piston system is used to enable repeated activation, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The spring-biased index piston system uses automatic mechanical feedback where fluid pressure activates the valve and spring force returns it to closed position, eliminating the need for complex external control systems while enabling repeated activation.
Solution Approach 2:
The valve leverages fluid circulation pressure to manipulate the index piston to open configurations and relies on spring force for return to closed configuration, using hydraulic/pneumatic principles to simplify control while enabling repeated operation.
3Ease of operation
If fluid circulation is used to manipulate the valve, then ease of operation is improved, but control precision over flow timing is reduced
Solution Approach 1:
The index pattern with indexing lug provides visual feedback on valve configuration state, allowing operators to precisely control timing by observing the indexed positions while maintaining ease of fluid-based operation.
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 complete well control during casing operations, allowing for controlled fluid flow in both directions and repeated cycling between closed and locked-open configurations, enhancing operational flexibility and efficiency in reverse cementing processes.
Implementation Method 1
a spring that biases the index piston toward the closed and locked-open configurations
Implementation Method 2
a detent in the index piston, wherein the detent restricts fluid flow in a circulation direction through a flow path through the index piston
Data Source
AI summary
A valve for a well pipe, the valve having the following parts: a valve collar connectable to the well pipe; an index piston coaxially positioned within the valve collar for longitudinal translation within the valve collar between closed, flow-open, and locked-open configurations; a detent in the index piston, wherein the detent restricts fluid flow in a circulation direction through a flow path through the index piston; a spring that biases the index piston toward the closed and locked-open configurations; and a plug of the valve collar that mechanically communicates with the index piston to be in corresponding closed, flow-open, and locked-open configurations.