Electromagnetic Multiphase Flowmeter RF Dielectric Measurement
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Solution Overview
Problem
Conventional methods for measuring multiphase flow in oil and gas wells, such as microwave and LC impedance techniques, face challenges in accuracy and maintenance due to absorption issues and the need for homogenous fluid mixtures, leading to costly and time-consuming processes for monitoring water cut and fluid composition.
Innovation Solution
A multiphase flowmeter using a spiraled electromagnetic transmission line that induces a Radio Frequency (RF) signal to measure the dielectric constant and conductivity of the fluid, allowing for accurate determination of water content and fluid composition without the need for mechanical mixers or homogenous fluid assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave or LC impedance measurement techniques are used to measure water cut, then measurement capability is provided, but measurement accuracy degrades due to absorption issues and requirement for homogenous fluid mixtures
Solution Approach 1:
The patent replaces mechanical mixing systems with an electromagnetic field-based measurement approach. Instead of requiring mechanical mixers to create homogenous fluid mixtures for accurate measurement, the system uses electromagnetic waves to directly measure dielectric properties of the fluid stream, eliminating the need for mechanical intervention and maintaining accuracy in non-homogenous flows.
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical mixing requirements to electromagnetic dielectric constant measurement. By measuring the dielectric constant of the fluid stream, the system can determine water cut without requiring the fluid to be homogenous, as the dielectric property measurement penetrates through non-homogenous structures.
2Ease of operation
If conventional single-phase measurement techniques are used after phase separation, then measurement simplicity is maintained, but response time increases and upstream production changes are not detected in real-time
Solution Approach 1:
The patent replaces the mechanical phase separation process with direct electromagnetic measurement of the multiphase flow in its natural state. Instead of separating phases mechanically and then measuring each phase, the system uses electromagnetic waves to directly measure the composition and flow rate of the multiphase mixture, enabling real-time detection of upstream production changes.
Solution Approach 2:
The patent performs measurement action upstream of the separator, before phase separation occurs. By measuring the dielectric constant and flow characteristics of the multiphase flow in the wellhead or upstream line, the system can detect production changes immediately as they occur, rather than waiting for phases to separate and for downstream measurements to reflect those changes.
3Productivity
If Multiphase Flowmeters are installed at each well to measure fluid compositions and rates, then real-time monitoring capability is improved, but device volume, maintenance requirements, and cost increase
Solution Approach 1:
The patent replaces complex mechanical multiphase flowmeter designs with a simpler electromagnetic measurement system. Instead of using complex mechanical separators, flow elements, and multiple sensors, the system uses electromagnetic waves to measure dielectric constant, conductivity, and flow rate simultaneously, reducing device complexity while maintaining real-time monitoring capability.
Solution Approach 2:
The patent creates a universal measurement system that can measure multiple parameters (water cut, oil cut, flow rate, temperature, pressure) simultaneously using a single electromagnetic measurement approach. This multi-functional capability replaces the need for multiple specialized devices at each well, reducing overall system complexity and cost.
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 solution provides accurate and efficient measurement of water content and fluid composition, reducing maintenance and operational costs while enabling real-time monitoring of multiphase flows in oil and gas wells.
Implementation Method 1
A multiphase flowmeter using a spiraled electromagnetic transmission line that induces a Radio Frequency (RF) signal to measure the dielectric constant and conductivity of the fluid
Implementation Method 2
measure the dielectric constant and conductivity of the fluid, allowing for accurate determination of water content and fluid composition
Data Source
AI summary
An electromagnetic flowmeter and a method for measuring a property of a fluid composition are provided. The electromagnetic flowmeter includes a first electric conductor with first and second ends, arranged inside a fluid conduit carrying a fluid composition comprising hydrocarbons, an RF electric signal source, and a first dual signal detector including first and second input ports. The first terminal of the electric signal source is connected to the first end of the first electric conductor and arranged to induce an RF electromagnetic wave in the fluid conduit by supplying an input electric signal to the first end of the first electric conductor. The first and second ports of the signal detector are connected to the first and second ends of the first electric conductor, respectively.