Induction Borehole Magnetic Sensor for 3D Field Measurement
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Solution Overview
Problem
Existing borehole electromagnetic tomography systems struggle to accurately measure broadband magnetic fields in three dimensions within a borehole, particularly in varied geological environments with diverse electrical resistivity and distances, due to limitations in sensitivity and frequency range of flux gate type sensors.
Innovation Solution
An induction type broadband 3-component borehole magnetic measuring sensor is developed as an integrated module, equipped with a 3-component fluxgate magnetometer, accelerometer, and magnetic sensors, along with a bucking coil configuration and calibration coils, to measure magnetic fields across x, y, and z axes within a borehole, enhancing sensitivity and frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flux gate type sensors are used for borehole electromagnetic tomography, then the system can measure magnetic fields, but the sensitivity and frequency range are limited
Solution Approach 1:
The patent changes the operating parameters of the magnetic sensor by switching from flux gate type to induction type, which fundamentally alters the frequency response characteristics and sensitivity. The induction type sensor operates effectively across a broadband frequency range (1 Hz to 100 kHz), resolving the contradiction between measurement precision and adaptability to varied geological environments with diverse electrical resistivity and distances.
2Measurement precision
If a 3-component magnetic sensor is deployed to measure magnetic fields in x, y, and z axes, then comprehensive 3D measurement is achieved, but the device complexity increases
Solution Approach 1:
The patent combines three orthogonal magnetic sensors (measuring x, y, and z components) into a single integrated 3-component sensor assembly. This merging approach achieves comprehensive 3D magnetic field measurement capability while minimizing device complexity through unified structure design, allowing the sensor to function as a cohesive unit within the borehole electromagnetic tomography system.
3Adaptability or versatility
If broadband frequency measurement is implemented to cover varied geological environments, then the system becomes more versatile, but the measurement accuracy may be compromised
Solution Approach 1:
The patent employs dynamic frequency sweeping capability where the system can operate across a continuous broadband frequency range (1 Hz to 100 kHz) and adapt the measurement frequency based on the specific geological conditions. The induction type magnetic sensor maintains measurement accuracy across this dynamic frequency range, allowing the system to optimize performance for varied electrical resistivity and distance conditions in different geological environments.
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 sensor enables precise and accurate 3D measurement of broadband magnetic fields, improving the exploration of underground geological features and resources by overcoming the limitations of existing systems in sensitivity and frequency range.
Implementation Method 1
induction type broadband 3-component borehole magnetic measuring sensor
Data Source
AI summary
Borehole electromagnetic exploration or tomography (EM tomography). An induction type broadband 3-component borehole magnetic measuring sensor can accurately and precisely measure a broadband magnetic field about x, y and z axes using a three-dimensional (3D) model within a borehole by monitoring natural variations in the earth's magnetic field or based on EM tomography using the borehole. The measuring sensor is applicable to energy resource fields such as petroleum and coal, mineral resources fields and civil engineering and environmental fields.