Valve Shift Detection via Integrated Spool Circuit
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Solution Overview
Problem
Current downhole formation evaluation tools face challenges in accurately detecting the actuation of sample directing valves, which is crucial for efficient fluid sampling and sample chamber sealing, leading to potential failures in fluid collection and pressure management.
Innovation Solution
Incorporation of valve shift detection systems within the sample directing valves, utilizing a resistor-wire mechanism that heats to expand and shift a spool, completing an electrical circuit when the valve actuates, allowing for real-time detection of valve position changes and ensuring proper fluid flow and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If valve shift detection systems are incorporated into sample directing valves, then reliability of valve actuation detection is improved, but device complexity increases
Solution Approach 1:
The detection system merges the valve actuation detection function directly into the sample directing valve assembly. The insulating body with embedded sensor is integrated with the valve spool and heater assembly, combining multiple functions (valve control, heating, and position detection) into a single integrated component rather than separate systems.
Solution Approach 2:
The valve assembly serves multiple functions: the spool directs fluid flow, the heater actuates the valve by expanding the spool, and the embedded sensor simultaneously detects the valve position. This multi-functional design eliminates the need for separate detection mechanisms, improving reliability while managing complexity through functional integration.
2Measurement precision
If electrical circuit completion is used to detect valve actuation, then measurement precision of valve position is improved, but device complexity increases
Solution Approach 1:
The valve assembly performs its own detection function through the integrated sensor that monitors its own actuation state. The electrical circuit completion is inherent to the valve's operation - when the spool moves to actuate the valve, it automatically completes or breaks the circuit, providing self-detection without requiring external monitoring systems.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with an electrical circuit completion method. Instead of using mechanical linkages, gears, or optical sensors to detect valve position, the system uses simple electrical contact that completes a circuit when the valve actuates, providing precise detection with minimal complexity.
3Ease of operation
If resistor-wire heating mechanism is used to actuate valve spool, then ease of operation is improved, but use of energy increases
Solution Approach 1:
The patent replaces mechanical actuation mechanisms (such as solenoids, pneumatic actuators, or manual valves) with a thermal expansion mechanism. Electrical heating of the resistor-wire causes the spool material to expand thermally, automatically moving it to the actuated position. This substitution provides ease of operation through simple electrical control while the energy consumption is managed by the efficient thermal expansion process.
Solution Approach 2:
The valve spool actuation is achieved by changing the thermal parameter (temperature) of the spool material rather than applying mechanical force directly. By heating the resistor-wire, the spool's temperature increases, causing thermal expansion that moves the spool to the actuated position. This parameter change approach simplifies operation while managing energy use through controlled thermal input.
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
Ensures reliable actuation and sealing of sample directing valves, preventing fluid loss or retention issues, and enabling continuous and accurate formation fluid sampling and pressure maintenance within sample chambers.
Implementation Method 1
utilizing a resistor-wire mechanism that heats to expand and shift a spool
Implementation Method 2
heats to expand and shift a spool
Data Source
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AI summary
The present disclosure relates to valve systems that include valve shift detection systems that can be employed to determine when a valve has shifted. According to certain embodiments, the valve shift detection systems may include a switch integrated into a valve block that may be closed upon shifting of the spool valve. In certain embodiments, the switch may include a component that completes a circuit upon contacting the valve. The valve shift detection systems also may include a controller designed to detect a voltage or current change produced by completing the circuit.