Hydrostatic Check Valve for Borehole Indexing Reliability
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Solution Overview
Problem
It is challenging to test a pressure-indexed valve on the surface with its indexing mechanism disabled and ensure it is enabled when inserted into a borehole, due to the risk of human error in manually adjusting the check valve.
Innovation Solution
A hydrostatically-operated piloted check valve is introduced to replace the manually adjusted check valve, which automatically switches to a closed position when the pressure outside the valve exceeds an activation threshold, reducing the likelihood of human error and ensuring the indexing mechanism operates correctly within the borehole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manually adjusted check valve is used to disable the indexing mechanism during pressure testing, then the valve can be tested on the surface, but human error may occur in manually adjusting the check valve, leading to unreliable enabling of the indexing mechanism
Solution Approach 1:
The check valve is designed to automatically respond to pressure differential conditions without manual intervention. When the pressure differential across the valve body exceeds the spring force, the check valve automatically opens to enable fluid communication and activate the indexing mechanism, eliminating the need for manual adjustment and reducing human error.
Solution Approach 2:
The manual adjustment mechanism is replaced with a hydrostatically actuated system. The check valve uses pressure differential forces to automatically control the opening and closing of the equalizing fluid communication path, substituting mechanical manual operation with a pressure-responsive mechanical system that is more reliable.
2Ease of manufacture
If the check valve is manually adjusted to open position during pressure testing, then pressure testing can be performed, but ensuring the check valve closes properly when inserted into the borehole is challenging
Solution Approach 1:
The check valve automatically closes when the pressure differential condition is no longer met (i.e., when the valve is inserted into the borehole and the pressure differential exceeds the spring force threshold). This self-actuating mechanism ensures reliable closing without requiring manual intervention or complex control systems.
Solution Approach 2:
The spring force is pre-configured to oppose the pressure differential force during pressure testing, keeping the check valve in the open position. When inserted into the borehole, the reversed pressure differential automatically overcomes the spring force, ensuring the check valve closes before operation begins, preventing premature activation.
3Reliability
If a hydrostatically-operated piloted check valve is used, then automatic switching reduces human error, but the device complexity increases
Solution Approach 1:
The check valve acts as an intermediary component that automatically controls the equalizing fluid communication path based on pressure differential conditions. This intermediary mechanism simplifies the overall system by eliminating the need for complex external control systems, sensors, or actuators, while still achieving reliable automatic switching.
Solution Approach 2:
The hydrostatic system uses the existing pressure differential conditions in the wellbore environment to automatically control the check valve. The system serves itself by using the operational pressure conditions to trigger the desired action, eliminating the need for external power sources, control electronics, or complex mechanical actuation systems.
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 hydrostatically-operated piloted check valve reliably enables the indexing mechanism only when the pressure conditions are met, minimizing errors and ensuring proper operation of the pressure-indexed valve during borehole insertion and operation.
Implementation Method 1
A hydrostatically-operated piloted check valve is introduced to replace the manually adjusted check valve, which automatically switches to a closed position when the pressure outside the valve exceeds an activation threshold
Data Source
AI summary
A pressure-activated device is inserted in a string for insertion into a borehole. The pressure-activated device has an indexing mechanism. The pressure-activated device has a piloted check valve that prevents the indexing mechanism from operating unless a pressure on an outside diameter of the pressure-activated device exceeds an activation threshold.