Nuclear Magnetic Flow Meter Magnetizing Device
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Solution Overview
Problem
Current nuclear magnetic flowmeters struggle with accurately measuring crude oil fractions less than 5% in multiphase media from oil wells due to variations in magnetic field strength and direction, leading to reduced measurement quality and economic inefficiencies.
Innovation Solution
A nuclear magnetic flowmeter design where the magnetic field has a consistent direction over the entire magnetization path, achieved by using a magnetization device with inner and outer carriers equipped with permanent magnets, allowing adjustable magnetic field strength through rotation and varying magnetic resistance, ensuring homogeneous magnetic fields for precise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple magnetizing segments are arranged one behind the other to extend the magnetization path, then the measurement range is improved, but the magnetic field direction consistency deteriorates
Solution Approach 1:
The magnetizing device is divided into multiple magnetizing segments arranged one behind the other along the longitudinal axis of the measuring tube. Each segment contains permanent magnets that generate magnetic fields oriented in the same direction, collectively extending the magnetization path length while maintaining field direction consistency throughout the entire path.
Solution Approach 2:
Each magnetizing segment is designed with permanent magnets specifically oriented to generate magnetic fields in a consistent direction along the longitudinal axis. This local configuration ensures that every segment contributes to the overall magnetization path extension while maintaining uniform magnetic field direction quality across all segments.
2Device complexity
If permanent magnets are used to generate magnetic field, then device complexity is reduced, but magnetic field strength adjustability deteriorates
Solution Approach 1:
The magnetizing device incorporates adjustable components that allow the magnetic field strength to be varied while maintaining the use of permanent magnets. The adjustment mechanism enables dynamic control of the magnetic field strength without requiring complex electromagnet systems, thus balancing device simplicity with operational flexibility.
Solution Approach 2:
The device allows variation of magnetic field strength parameters while using permanent magnets by adjusting the configuration or position of the magnets. This enables the system to adapt to different measurement requirements without switching to more complex electromagnetic systems, maintaining structural simplicity while achieving parameter adjustability.
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 design enhances measurement accuracy for flow velocities and phase proportions in multiphase media, enabling the economic exploitation of wells with low crude oil content by maintaining consistent magnetic field direction and strength, thereby improving measurement quality.
Implementation Method 1
The magnetizing device is provided with permanent magnets for generating the magnetic field used to magnetize the medium
Implementation Method 2
The magnetizing device is provided with permanent magnets for generating the magnetic field used to magnetize the medium
Implementation Method 3
Measurement and analysis methods that exploit the property of precession of atomic nuclei with a magnetic moment in the presence of a macroscopic magnetic field are called nuclear magnetic resonance measurement or analysis methods
Implementation Method 4
In this process, the magnetic moment vector of the nucleus precesses around the vector of the macroscopic magnetic field at the nucleus's location. The frequency of this precession is called the Larmor frequency
Implementation Method 5
the magnetic field has the same direction over the entire magnetization path
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
Described and illustrated – as part of a magnetic flowmeter for measuring the flow rate of a medium (6) flowing through a measuring tube (5) – is a magnetizing device (1) for magnetizing the medium (6) flowing through the measuring tube (5) via a magnetizing section (7) along the longitudinal axis (8) of the measuring tube (5). The magnetizing device (1) is equipped with permanent magnets for generating the magnetic field used to magnetize the medium (6) and has at least two magnetizing segments (9) arranged one behind the other in the direction of the longitudinal axis (8) of the measuring tube (5). Even if the magnetic field strength in the medium (6) varies along the length of the magnetizing section (7), the magnetic field maintains the same direction.