Fluid Densitometer Temperature Correction via Distributed Sensor
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Solution Overview
Problem
Existing fluid densitometers face challenges in accurately measuring fluid density due to interference from transmitter and receiver proximity and lack of temperature correction, leading to inaccurate measurements, especially in extreme or varying temperature environments.
Innovation Solution
A sensor system that includes a flow tube, a vibration driver, a vibration detector, and a distributed temperature sensor, where the temperature sensor measures the temperature of the flow tube to provide a correction for fluid density calculations, using components like metallic wires, strain gauges, or fiber optic sensors to detect temperature and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmitter or driver is located in close proximity to the receiver to save space in downhole applications, then the device complexity is reduced, but the measurement precision deteriorates due to interference between the two components distorting the signal
Solution Approach 1:
A damping element is introduced as an intermediary component between the vibration driver and the receiver. This damping element absorbs and dissipates the mechanical vibrations generated by the driver, preventing them from reaching the receiver and causing signal distortion. This allows the driver and receiver to be positioned in close proximity without compromising measurement precision, thus maintaining compact device complexity while ensuring accurate measurements.
2Measurement precision
If multiple flow tubes are used to create a reference point to cancel out external interference, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The reference function is extracted from a separate physical flow tube and integrated into the single measurement flow tube through signal processing. The system separates the reference signal generation from the physical structure, allowing the reference cavity to be formed within the same flow tube assembly. This extraction approach maintains measurement precision by providing interference cancellation while avoiding the complexity of multiple independent flow tubes.
3Device complexity
If no temperature correction is provided in densitometers, then the device complexity is reduced, but the measurement precision deteriorates in environments having extreme or varying temperatures
Solution Approach 1:
A temperature sensor is integrated into the densitometer to continuously monitor the temperature of the flow tube. The measured temperature is fed back to a correction algorithm that adjusts the density measurement in real-time based on the temperature-dependent properties of the fluid and the measurement system. This feedback mechanism compensates for temperature-induced measurement errors, maintaining high measurement precision across varying temperature conditions without significantly increasing device complexity.
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 solution enhances the accuracy of fluid density measurements by accounting for temperature variations, reducing interference, and allowing for precise determination of fluid properties in diverse temperature conditions.
Implementation Method 1
a distributed temperature sensor coupled to the flow tube, the distributed temperature sensor measuring a temperature of the flow tube as the flow tube vibrates
Implementation Method 2
the vibration driver configured to drive the flow tube to vibrate
Implementation Method 3
each flow tube is driven such that it oscillates about an axis causing each tube to twist about a torsional axis to produce a slight deformation and deflection of the conduit proportional to the mass flow rate of the fluid
Implementation Method 4
the vibration detector detecting characteristics related to the vibrating flow tube
Implementation Method 5
the resonant frequency at which each flow tube oscillates depends upon its total mass, i.e. the mass of the empty tube itself plus the mass of the fluid flowing therethrough. Inasmuch as the total mass will vary as the density of the fluid flowing through the tube varies, the resonant frequency will likewise vary with any changes in density
Data Source
AI summary
A sensor for measuring a density of a fluid is provided. The sensor (200) includes a flow tube (104) for receiving the fluid and a vibration driver (102) coupled to the flow tube, the vibration driver configured to drive the flow tube to vibrate. The sensor also includes a vibration detector (106) coupled to the flow tube, the vibration detector detecting characteristics related to the vibrating flow tube, and a distributed temperature sensor (202) coupled to the flow tube, the distributed temperature sensor measuring a temperature of the flow tube as the flow tube vibrates. The sensor further includes measurement circuitry (110) coupled to the vibration detector and the distributed temperature sensor, the measurement circuitry determining a density of the fluid from the detected characteristics related to the vibrating flow tube and the measured temperature of the flow tube.