Dielectric Button Isolation for Magnetometer Noise Reduction

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Solution Overview

Problem

Magnetometers used in downhole logging tools are prone to measurement errors due to electrical noise and magnetic flux interference, which complicates the detection of magnetic anomalies in subterranean formations, especially in sensitive applications like steam-assisted gravity drainage (SAGD) operations.

Innovation Solution

The implementation of magnetic flux receiver assemblies with dielectric buttons that electronically and magnetically insulate magnetometers from adjacent components, reducing electrical noise and enhancing measurement accuracy by creating axial and radial gaps between conductive parts, thereby isolating the magnetometers effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If magnetometer sensitivity is increased to detect weaker magnetic signals, then measurement precision improves, but the magnetometer becomes more vulnerable to electrical noise and magnetic flux interference

Engineering Contradiction:

Improvemagnetometer measurement accuracyVSAvoidelectrical noise and magnetic flux interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A non-conductive barrier layer is introduced between the magnetometer and conductive components (collar, tool insert, buttons). This intermediary layer blocks electrical noise and magnetic flux interference from reaching the magnetometer while allowing the magnetometer to function normally, thus resolving the contradiction between high sensitivity and vulnerability to interference

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetometer is electrically isolated from conductive parts by removing the direct electrical connection through the non-conductive barrier layer. This extraction of the magnetometer from the conductive environment eliminates the harmful interference while preserving measurement capability

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If electronic devices are added to control and monitor magnetometers, then operational capability improves, but electromagnetic interference with magnetometer operation increases

Engineering Contradiction:

Improvemagnetometer control and monitoringVSAvoidelectromagnetic fields from electronic devices

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The non-conductive barrier layer serves as a mediator that allows electronic devices to be present in the system while preventing their electromagnetic fields from interfering with the magnetometer. The barrier layer enables operational capability while blocking harmful electromagnetic interference

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If dielectric buttons are used to electrically isolate the tool insert from the collar, then electrical noise reduction improves, but device complexity increases

Engineering Contradiction:

Improveelectrical noiseVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Thin dielectric buttons or coatings are used instead of complex structural modifications. These thin non-conductive elements provide effective electrical isolation between the tool insert and collar while adding minimal structural complexity, thus resolving the contradiction between noise reduction and device complexity

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution provides high-definition and accurate magnetometer measurements in harsh downhole environments, reducing measurement errors and allowing for precise detection of magnetic anomalies, which is essential for effective SAGD operations and other drilling applications.

Implementation Method 1

dielectric buttons that electronically and magnetically insulate magnetometers from adjacent components

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

magnetometers, which are used to measure the strength and direction of magnetic fields, including the Earth's magnetic field

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentUS11333014B2Electrical isolation to reduce magnetometer interference

Publication Date: 2022.05.17 HALLIBURTON ENERGY SERVICES INC

AI summary

A magnetic flux receiver assembly includes a collar that defines a central passageway and an axial collar face, and a tool insert disposable within the central passageway and defining an axial insert face. One or more magnetometers are operatively coupled to the tool insert. One or more buttons are coupled to one or both of the axial collar face and the axial insert face such that an axial gap is defined at an axial interface between the axial collar face and the axial insert face to prevent electrical communication across the axial interface.