Coriolis Multiphase Flow Metering with Dissolved Gas Correction
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Solution Overview
Problem
Coriolis flowmeters face errors in mass flow and density measurements when dealing with multiphase fluids, particularly due to the presence of dissolved gas, which existing technologies fail to accurately account for, leading to inconsistencies in flow rate and density readings.
Innovation Solution
The system incorporates a Coriolis flowmeter with sensors and processors that measure phase difference, frequency, pressure, and temperature to determine fluid flow rates and density, using a gas solubility model to account for dissolved gas and provide accurate corrections, enabling improved multiphase flow rate and density measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Coriolis flowmeter is used to measure multiphase fluid flow, then mass flow and density measurements can be obtained, but measurement precision deteriorates due to the presence of dissolved gas
Solution Approach 1:
The patent applies parameter changes by using a gas solubility model that calculates the amount of dissolved gas based on pressure and temperature parameters. The model uses these thermodynamic parameters to determine the dissolved gas content, which then allows for correction of the mass flow and density measurements to compensate for the presence of dissolved gas in the multiphase fluid
Solution Approach 2:
The patent implements feedback by using the measured pressure and temperature values as inputs to the gas solubility model, which then provides correction factors that are applied back to the mass flow and density measurements. This closed-loop approach continuously adjusts the measurements based on the actual dissolved gas content inferred from process conditions
2Measurement precision
If dissolved gas is not accounted for in multiphase flow measurement, then device complexity remains low, but measurement precision deteriorates
Solution Approach 1:
The patent introduces an intermediary approach by using a gas solubility model as a computational mediator between the raw Coriolis measurements and the corrected results. Rather than adding complex physical sensors or measurement devices, the patent uses software-based modeling that acts as an intermediary layer to adjust the measurements based on pressure and temperature data
Solution Approach 2:
The patent replaces what would otherwise require complex mechanical or physical measurement systems with a computational model. Instead of adding sophisticated hardware to directly measure dissolved gas, the patent substitutes a gas solubility model that uses standard pressure and temperature sensors combined with mathematical calculations to achieve the same measurement correction goal
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 approach enhances the accuracy of mass flow and density readings during multiphase flow by modeling and correcting for the effects of dissolved gas, providing more reliable measurements in the oil and gas industry and other applications.
Implementation Method 1
A Coriolis flowmeter includes an electronic transmitter and a vibratable flowtube through which fluid to be metered can be passed
Implementation Method 2
The frequency of oscillation of the flowtube of a Coriolis meter varies with the density of the process fluid in the flowtube
Implementation Method 3
The physics of the device dictate that Coriolis forces act along a section of the flowtube between the sensors, resulting in a phase difference between the generally sinusoidal sensor signals
Data Source
AI summary
A system for metering flow of a fluid has a vibratable flowtube for receiving a multiphase fluid flow. A driver is configured to vibrate the flowtube. A pair of sensors is configured to detect movement of the flowtube at different locations on the flowtube. Pressure and temperature sensors are configured to measure a pressure of the fluid. One or more processors are configured to use a phase difference between the sensor signals to determine a fluid flow rate through the flowtube. The one or more processors are further configured to determine an amount of dissolved gas in the multiphase fluid using the pressure, the temperature, and the relative amounts the multiple liquids in the multiphase fluid.