Downhole Fluid Control Valve for Leak-Induced Pressure Balancing
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Solution Overview
Problem
In downhole hydraulic systems, there is a risk of leakage leading to unintended operation of downhole equipment due to ambient pressure exceeding the pressure within control lines, causing pressurization and potential actuation of valves and other devices.
Innovation Solution
A downhole fluid control apparatus with first and second conduits and a valve that can be configured between pressure communication and isolation, operated by an actuator in pressure communication with both conduits and the ambient region, ensuring the valve is in a balanced configuration when ambient pressure is higher, preventing unintentional operation and allowing controlled pressure differentials for device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control line is exposed to ambient pressure in a leak scenario, then the control line becomes pressurized, but this causes undesired actuation of downhole equipment
Solution Approach 1:
The patent applies equipotentiality by ensuring that when the valve is in its first configuration, both sides of the actuator are exposed to the same ambient pressure, creating a pressure-balanced state. This prevents pressure differentials from forming across the actuator, thereby preventing unintentional actuation even when leakage occurs. The balanced configuration maintains equal pressure potential on both sides of the actuator.
2Reliability
If the valve is configured to allow pressure communication between conduits, then pressure balancing prevents unintentional operation, but this prevents establishment of pressure differential needed for device operation
Solution Approach 1:
The patent applies dynamics by making the valve configuration changeable between two states: a first configuration that provides pressure communication and balancing for safety, and a second configuration that isolates conduits to enable pressure differential establishment for device operation. The system dynamically transitions between these states based on operational requirements, allowing both safety and functionality.
Solution Approach 2:
The patent applies parameter changes by transitioning the valve between different configurations that alter the pressure communication parameters between conduits. In the first configuration, pressure communication is allowed for balancing; in the second configuration, isolation is achieved to enable operational pressure differentials. This parameter switching resolves the contradiction between safety and operability.
3Reliability
If the actuator is in pressure communication with ambient region, then leakage does not cause actuator operation due to pressure balancing, but this requires the actuator to be exposed to ambient pressure
Solution Approach 1:
The patent applies equipotentiality by connecting both sides of the actuator to the same ambient pressure region when the valve is in its first configuration. This creates a pressure-balanced state where no pressure differential can form across the actuator, preventing unintentional actuation from leakage. The actuator experiences equal pressure potential on both sides, eliminating the harmful effect of ambient pressure exposure.
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 apparatus minimizes the risk of unintentional operation by maintaining a balanced configuration until a controlled pressure differential is established, allowing safe and intentional operation of downhole devices, even in the presence of leaks, and operates in a 'fail-as-is' mode to prevent actuator reconfiguration by ambient pressure.
Implementation Method 1
the actuator being in pressure communication with the first and second conduits and with an ambient region external of the apparatus such that when the pressure within each of the first and second conduits is lower than the ambient pressure the valve is configured in its first configuration, and when the pressure within at least one of the first and second conduits exceeds the ambient pressure the valve is configured in its second configuration
Implementation Method 2
When the valve member is in its first configuration the first and second conduits are in pressure communication with each other, and thus pressure balanced
Data Source
AI summary
A downhole fluid control apparatus comprises first and second conduits for providing communication between a pressure source and a downhole device, and a valve provided within a housing and configurable between a first configuration in which the first and second conduits are in pressure communication via the valve, and a second configuration in which the first and second conduits are isolated from each other. The apparatus further comprises an actuator for operating the valve. The actuator is in pressure communication with the first and second conduits and with an ambient region external of the apparatus such that when the pressure within each of the first and second conduits is lower than the ambient pressure the valve is configured in its first configuration, and when the pressure within at least one of the first and second conduits exceeds the ambient pressure the valve is configured in its second configuration.