Separator Dump Valve Control Using Float-Arm Angle Feedback
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Solution Overview
Problem
Existing dump valve systems are insufficient for volatile wells, as they have limited dump rates and rely on single-point level monitoring, leading to potential emergency shut downs and inaccurate metering due to fluctuations in flow rate, pressure, and density of crude oil.
Innovation Solution
A dump valve system with an automatic dump valve, float, float arm, inclinometer, and control module that adjusts the flow rate based on angular disposition and flow rate signals to maintain optimal liquid levels in the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional float-controlled dump valves are used, then the system is simple to operate, but the dump rate is limited and cannot handle volatile wells
Solution Approach 1:
The patent implements dynamic control of the dump valve by replacing static float control with an automated control system that continuously adjusts the valve position based on real-time level sensor feedback. This allows the dump rate to dynamically adapt to volatile production conditions while maintaining system simplicity through automated decision-making algorithms.
Solution Approach 2:
The system incorporates level sensors that continuously monitor the separator vessel level and feed this information back to the control module. The control module uses this feedback to automatically adjust the dump valve position, creating a closed-loop control system that optimizes dump rate without requiring complex manual intervention.
2Reliability
If single-point level monitoring is used, then the device complexity is low, but emergency shut downs occur due to inaccurate level detection
Solution Approach 1:
The patent divides the level monitoring function into multiple discrete level sensors positioned at different heights within the separator vessel. Each sensor monitors a specific level threshold, and the control system integrates signals from multiple sensors to make comprehensive level assessment decisions, thereby improving detection accuracy without creating a monolithic complex system.
Solution Approach 2:
The system uses multiple level sensors that monitor beyond the single critical point, providing early warning signals at different level thresholds. This excessive monitoring capability ensures that potential issues are detected before they lead to emergency shut downs, improving reliability while maintaining manageable system complexity through staged response protocols.
3Measurement precision
If fixed dump rate valves are used, then the control system is simple, but flow rate fluctuations cause inaccurate metering
Solution Approach 1:
The control system continuously receives feedback from level sensors and flow meters, using this information to dynamically adjust the dump valve position. This closed-loop control ensures that the dump rate automatically compensates for flow rate fluctuations, maintaining accurate metering conditions without requiring complex manual calibration or fixed-rate limitations.
Solution Approach 2:
The system dynamically changes the operational parameters of the dump valve, specifically the valve opening degree and dump rate, based on real-time measurements of level, flow rate, and pressure. This parameter adjustment capability allows the system to maintain optimal metering conditions despite varying production conditions, improving measurement precision while using standard control components.
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 provides a wider range of dump rates and accurate level monitoring, preventing emergency shut downs and ensuring consistent metering by dynamically adjusting to changes in flow conditions.
Implementation Method 1
a float arm connected to the float and an inclinometer attached to the float arm
Implementation Method 2
a float inside the vessel, a float arm connected to the float
Implementation Method 3
automatic dump valve connected downstream from the liquid discharge and configured to adjust the flow rate of the liquid
Data Source
AI summary
A dump valve system controls the level of a liquid inside a vessel that includes a liquid discharge. The 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 inside the vessel, a float arm connected to the float, and an inclinometer attached to the float arm and configured to output an angular disposition signal representative of the angular disposition of the float arm. The dump valve system can also include a flow meter configured to measure the flow rate of liquids discharged from the automatic dump valve and output a flow rate signal representative of the measured flow rate. A control module is configured to adjust the operation of the automatic dump valve in response to the flow rate signal and the angular disposition signal.