FBG Optical Interface Sensing for Emulsion-Prone Oil Separators
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Solution Overview
Problem
Current technologies for measuring the interface level between fluids in tanks and reservoirs in the oil and gas industry face challenges due to emulsion and foam layers, harsh environments, safety concerns, and operational complexities, leading to unreliable measurements and increased costs.
Innovation Solution
An optical system using single-mode optical fiber with Fiber Bragg Gratings (FBGs) to measure the water-oil interface level based on thermal properties, which is compact, lightweight, and intrinsically safe, allowing for multiplexing and temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional level measurement sensors are used in oil-water separation tanks, then interface level detection is performed, but measurement reliability deteriorates due to emulsion and foam layers affecting sensor accuracy
Solution Approach 1:
The patent replaces conventional electrical measurement sensors with an optical measurement system based on fiber optic technology. The system uses optical fibers to detect thermal properties of fluids at the interface, eliminating the harmful effects of electrical components in harsh environments with emulsion and foam layers. This substitution of measurement principle fundamentally resolves the reliability issue while maintaining precision.
Solution Approach 2:
The patent changes the measurement parameter from electrical properties to thermal properties detection. By measuring thermal conductivity and heat transfer characteristics of the fluid interface, the system can distinguish between oil, water, and emulsion layers based on their different thermal signatures, thereby achieving reliable measurements even in the presence of foam and unstable emulsion layers.
2Productivity
If multiple separators are installed in series to improve separation efficiency, then oil-water separation performance is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent implements a feedback control system that uses accurate real-time interface level detection to automatically adjust separator operation. The optical sensor provides continuous feedback on the water-oil interface position, enabling automatic control of separation processes. This allows a single separator to achieve the performance of multiple separators through intelligent control, reducing system complexity while maintaining high separation efficiency.
3Ease of manufacture
If employees manually measure fluid levels using hand rulers, then measurement costs are reduced, but safety risks and operational complexity increase due to exposure to hazardous environments
Solution Approach 1:
The patent replaces manual mechanical measurement with automated optical sensing. Fiber optic sensors are installed in the separator to continuously monitor interface levels, eliminating the need for employees to enter hazardous areas. The system provides automatic, continuous measurement without exposing personnel to toxic gases, high temperatures, or pressure risks, thereby resolving the safety contradiction while maintaining cost-effectiveness.
4Reliability
If fiber optic sensors are used for interface level detection, then measurement reliability is improved, but device complexity increases due to optical system requirements
Solution Approach 1:
The patent designs the fiber optic sensor system to perform multiple functions simultaneously. The same optical fiber infrastructure is used for both interface level detection and temperature measurement, and can be extended to monitor other parameters. This multi-functionality reduces the need for separate measurement systems, thereby minimizing the increase in device complexity while maximizing measurement reliability through redundant sensing capabilities.
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 accurate and reliable interface level detection with reduced maintenance costs, enabling efficient oil separation processes and safer operations in classified areas.
Implementation Method 1
An optical system using single-mode optical fiber with Fiber Bragg Gratings (FBGs) to measure the water-oil interface level based on thermal properties
Implementation Method 2
The system provides accurate and reliable interface level detection with reduced maintenance costs, enabling efficient oil separation processes
Data Source
AI summary
The present invention proposes a system for measuring the water-oil interface level based on the fluid thermal properties. To overcome limitations related to the interface level in oil separation processes, an interface level sensor must detect water, oil, emulsion and foam layers. Furthermore, maintenance costs must be low and the time between maintenance must be high, in order to obtain high production rates and more reliable control of the oil separators.Optical system for measuring the water-oil interface level from fluid thermal properties comprises single-mode optical fiber (1), FBG (2), PTFE tube (3), connection (4), flange (5), optical connectors (6) and optical interrogator (7).