Degaussing Drilling Fluids to Remove Magnetic Interference

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Solution Overview

Problem

MWD systems face inaccuracies in recording positional data due to magnetic interference from ferrous materials in drilling fluids, leading to potential well bore deviation errors as drilling progresses, especially in complex wells.

Innovation Solution

A demagnetization apparatus and method are introduced, which includes a demagnetization unit with a degaussing coil attached to a well pipe, capable of demagnetizing drilling fluids as they circulate, using a magnetometer to detect magnetic flux and initiate degaussing when above a threshold, ensuring accurate measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ferrous materials are added to drilling fluids to improve rheological properties, then fluid performance is enhanced, but magnetic interference increases causing measurement errors

Engineering Contradiction:

Improvefluid performanceVSAvoidpositional data accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts and removes ferrous materials from the drilling fluid using a magnetic separation system. Magnets are positioned to attract and capture ferrous particles as the fluid circulates, separating the harmful magnetic materials from the beneficial fluid components, thereby eliminating measurement interference while preserving fluid performance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary magnetic separation system between the drilling fluid and the measurement tools. This intermediary system uses magnets to capture ferrous materials, preventing them from reaching and interfering with the MWD/LWD measurement instruments, thus protecting measurement accuracy without affecting fluid rheology

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If strong magnets are used to remove ferrous materials from drilling fluid, then magnetic interference is reduced, but device complexity increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoiddemagnetization system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the demagnetization function with existing drilling fluid circulation components. The magnetic separation system is integrated into the fluid circulation pathway, combining the removal function with the existing pump and pipe infrastructure, thereby reducing overall system complexity while maintaining measurement accuracy

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent designs the magnetic separation system to serve multiple functions: it removes ferrous materials from drilling fluid, protects measurement tools from interference, and can be integrated into existing circulation systems. This multi-functionality reduces the need for separate dedicated systems, thereby simplifying overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 improves measurement accuracy by reducing magnetic interference, minimizing well bore deviation, and allowing for more precise geosteering and drilling practices, even in complex well scenarios.

Implementation Method 1

A demagnetization apparatus and method are introduced, which includes a demagnetization unit with a degaussing coil attached to a well pipe, capable of demagnetizing drilling fluids as they circulate

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction