Differential Pressure Sand Detection in Separator Vessels
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Solution Overview
Problem
Existing automated sand dump control systems in oil and gas well operations face inefficiencies and reliability issues due to time-based and level-based methods, leading to sand carryover, equipment erosion, and inaccurate sand volume measurement, especially in high-pressure and erosive environments.
Innovation Solution
A differential pressure based automated detection and handling system that measures the pressure of a column of multi-phase fluid in a separator vessel to determine the level, volume, or weight of separated solids, using a viscosity sensor to adjust the sand dump process and prevent plugging of the hydrocyclone outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If time-based sand dump control systems are used, then automated sand removal is achieved, but sand carryover and equipment erosion increase due to inaccurate timing
Solution Approach 1:
The system employs a differential pressure sensor that continuously monitors the actual sand level in the separator vessel and feeds this information back to the control system. This feedback mechanism allows the automated system to adjust dump valve operation timing and duration based on real-time conditions, preventing both sand carryover and unnecessary liquid discharge, thereby resolving the contradiction between automation and reliability.
Solution Approach 2:
The invention replaces purely time-based mechanical control with a sensor-based differential pressure measurement system. The differential pressure sensor converts physical sand level information into electrical signals that the control system can process, enabling more accurate and adaptive automation that responds to actual conditions rather than predetermined schedules.
2Reliability
If level-based sand dump control systems are used, then sand level monitoring is improved, but measurement precision deteriorates in high-pressure and erosive environments
Solution Approach 1:
The system introduces differential pressure as an intermediary measurement parameter. Instead of directly measuring sand level or volume in the harsh separator environment, the system measures pressure differences across a sensing element that indirectly indicates sand accumulation. This intermediary approach protects the measurement system from direct exposure to high-pressure and erosive conditions while maintaining measurement capability.
Solution Approach 2:
The invention changes the measurement parameter from direct level or volume measurement to differential pressure measurement. By measuring pressure differences rather than direct physical dimensions, the system achieves more reliable and precise measurements in high-pressure environments where traditional level sensors would fail or provide inaccurate readings.
3Productivity
If sand dump valve remains open for extended periods, then sand removal is enhanced, but hydrocarbon gas and oil carryover to disposal tank increases
Solution Approach 1:
The differential pressure sensor provides continuous feedback on the actual sand level during the dump operation. When the sand level drops to the desired threshold, the sensor signal triggers automatic closure of the dump valve, stopping the discharge process. This feedback control prevents extended valve opening that would cause hydrocarbon carryover, while ensuring sufficient sand removal by maintaining the valve open until the sand level reaches the target.
4Loss of substance
If dump valve closes early, then hydrocarbon carryover is reduced, but sand buildup in separator vessel occurs
Solution Approach 1:
The system uses differential pressure sensor feedback to determine the precise moment to close the dump valve. The sensor continuously monitors sand level during discharge and triggers valve closure only when the sand level reaches the predetermined threshold, ensuring complete sand removal while preventing premature closure that would leave sand buildup in the separator vessel.
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
This system reduces sand carryover, maintains equipment integrity, and accurately measures sand production, enhancing operational efficiency and reducing maintenance needs by continuously monitoring and adjusting the sand dump process based on real-time fluid properties.
Implementation Method 1
a differential pressure sensing system adapted to measure a differential pressure of a column of the multi-phase fluid in the separator vessel
Implementation Method 2
a separator vessel adapted to separate solids particles from a flow of a multi-phase fluid
Data Source
AI summary
One illustrative system disclosed herein includes a separator vessel that is adapted to separate solids particles from a flow of a multi-phase fluid, a differential pressure sensing system that is adapted to measure a differential pressure of a column of the multi-phase fluid in the separator vessel and a control system that is adapted to determine at least one of a level, volume or weight of the separated solids particles within the separator vessel based upon at least the measured differential pressure of the column of the multi-phase fluid in the separator vessel.