Displacer-Based Liquid Level Control for Variable Dump Rates
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Solution Overview
Problem
Existing dump valve systems for separator vessels are limited by a restricted range of dump rates and rely on single-point level monitoring, leading to potential emergency shut-downs due to inadequate fluid discharge management.
Innovation Solution
A dump valve system that includes an automatic dump valve, a float assembly, a level controller with a linear position sensor assembly, and a control module that adjusts the dump valve operation based on real-time level and flow rate measurements, enabling a wider range of dump rates and more accurate level monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple single point level controller is used with a fixed valve stroke, then the device complexity is reduced, but the adaptability to varying production rates is limited
Solution Approach 1:
The patent implements a dynamic control system where the valve stroke is no longer fixed but varies based on real-time level measurements from multiple sensors. The controller continuously adjusts the dump valve opening degree according to the actual liquid level and production conditions, enabling the system to adapt to varying production rates while maintaining manageable complexity through automated feedback control.
Solution Approach 2:
The system employs multiple level controllers that provide continuous feedback signals to the dump valve controller. This feedback mechanism allows the system to monitor liquid levels at different points and automatically adjust the valve stroke accordingly, resolving the contradiction by enabling adaptability through information feedback without requiring complex manual intervention.
2Device complexity
If the valve stroke is limited to provide an estimated flowrate, then the device complexity is reduced, but the productivity cannot accommodate temporary production increases
Solution Approach 1:
The patent transforms the static valve stroke setting into a dynamic parameter that can vary within a wide range based on production conditions. The controller enables the dump valve to operate from partial opening to full opening, allowing the system to accommodate temporary production increases up to three times the estimated flowrate without requiring multiple valves or complex mechanical adjustments.
Solution Approach 2:
The system changes the operational parameter of valve stroke from a fixed value to a variable parameter controlled by electrical signals. This allows the valve opening degree to be continuously adjusted based on real-time level measurements, enabling the system to handle varying production rates and temporarily accommodate up to 300% of the estimated flowrate while maintaining simple valve hardware.
3Device complexity
If a single point level monitoring is used, then the device complexity is reduced, but the reliability of level control is insufficient for volatile wells
Solution Approach 1:
The patent divides the level monitoring function into multiple independent level controllers positioned at different heights in the separator vessel. Each level controller monitors a specific zone and provides independent feedback signals. This segmentation of the monitoring function allows the system to detect level changes more reliably and provide more accurate control information to the dump valve controller.
Solution Approach 2:
The system merges the outputs from multiple level controllers into a unified control signal for the dump valve. By combining the information from multiple monitoring points, the system achieves more reliable level detection and control decisions, resolving the contradiction by improving reliability through information integration while keeping the overall control logic manageable.
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 system effectively manages fluid levels in separator vessels by allowing for a broader range of dump rates and providing real-time monitoring, thereby preventing emergency shut-downs and ensuring stable operation even under fluctuating well production conditions.
Implementation Method 1
The level controller includes a linear position sensor assembly configured to output an electric signal
Implementation Method 2
The float assembly includes a float inside the vessel and a float arm connected to the float
Data Source
AI summary
A dump valve system includes an automatic dump valve connected downstream from the liquid discharge and configured to adjust the flow rate of the liquid through the liquid discharge, a float assembly, a level controller and a control module. The float assembly includes a float inside the vessel and a float arm connected to the float. The level controller includes a linear position sensor assembly configured to output an electric signal and an internal drive mechanism between the float arm and the linear position sensor assembly, where the internal drive mechanism translates a rotational movement of the float arm into a linear movement of the linear position sensor assembly. The control module is configured to adjust the operation of the automatic dump valve based on the output from the linear position sensor assembly.