Induction Logging Sensor Amorphous Magnetic Core Transient Signal Detection
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Solution Overview
Problem
Existing electromagnetic well logging sensors, particularly those using ferrite cores, face limitations in sensitivity and structural integrity due to brittleness, leading to reduced accuracy and reliability in detecting transient signals in drilling environments.
Innovation Solution
The use of magnetic cores made from materials with high initial magnetic permeability, such as amorphous ribbon or nano-magnetic materials, which provide enhanced sensitivity, stability, and mechanical reliability, allowing for improved detection of transient signals and better tolerance to drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ferrite materials are used as magnetic core in induction sensors, then the sensor can be manufactured with conventional materials, but the sensor sensitivity and measurement precision are limited
Solution Approach 1:
The patent changes the magnetic properties parameter by selecting materials with high initial magnetic permeability (such as amorphous magnetic alloys or nanocrystalline materials) instead of conventional ferrite materials. This parameter change directly increases the sensor's sensitivity and measurement precision while maintaining manufacturability through established material processing techniques.
Solution Approach 2:
The patent employs composite magnetic core structures that combine materials with high initial permeability and low electromagnetic loss. These composite materials integrate the benefits of different material properties to achieve superior sensor performance while remaining compatible with conventional manufacturing processes.
2Reliability
If conventional magnetic materials are used, then the sensor structure is simple, but the sensor cannot tolerate harsh drilling conditions and has reduced reliability
Solution Approach 1:
The patent changes the mechanical and thermal parameters of the magnetic core material by selecting amorphous or nanocrystalline materials that possess both high mechanical strength and thermal stability. These material parameter changes enable the sensor to withstand harsh drilling conditions including high temperatures, pressures, and mechanical shocks, thereby improving reliability without significantly increasing structural complexity.
3Measurement precision
If high sensitivity is achieved through material selection, then measurement precision improves, but electromagnetic losses increase
Solution Approach 1:
The patent optimizes the frequency-dependent parameters of the magnetic core material by selecting amorphous or nanocrystalline materials that exhibit low electromagnetic loss at the operating frequencies of the induction sensor. The material's intrinsic properties are tailored to minimize hysteresis and eddy current losses while maintaining high initial permeability, thus achieving both high sensitivity and low energy loss.
Solution Approach 2:
The patent applies local quality optimization by designing the magnetic core structure to have specific material properties at different regions. The magnetic core is configured to provide high permeability in regions where flux concentration is needed for sensitivity, while incorporating loss-minimizing material characteristics in regions where electromagnetic losses occur, thereby balancing sensitivity and energy efficiency.
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 significantly increases sensor sensitivity and stability, enabling more accurate data collection and improved geosteering capabilities by amplifying magnetic flux and maintaining sensitivity across varying temperatures and harsh drilling conditions.
Implementation Method 1
the material also having a high initial magnetic permeability as compared to a ferrite material
Implementation Method 2
When the magnetic dipole is rapidly switched on or off, transient currents are induced in the surrounding rock formations. These currents diffuse outward and experience changes as the currents intersect variations in rock resistivity. As the currents diffuse outward, they in turn induce magnetic fields that may be detected in the receiver sensor.
Data Source
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AI summary
Apparatuses and methods are provided herein that may improve sensitivity to transient signals. For example, an electromagnetic sensor for downhole measurements that includes a plurality of sectors (e.g., four quadrants) is provided herein. Each quadrant may include a magnetic core formed of a material with a high initial magnetic permeability to improve sensitivity to transient signals. A sensor for continuous wave induction tools is also provided, and may include a magnetic core formed of a material with a high initial magnetic permeability. Forming each sector magnetic core of a material with a high mechanical reliability may allow the magnetic core of the corresponding sensor to be pliable and flexible and not brittle and prone to breaking. Furthermore, the corresponding sensor may have enhanced sensitivity, greater stability of sensitivity relative to temperature changes, and high mechanical reliability.