Magnetic Pipeline Centering Wheels for Oil-Film Traction

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Solution Overview

Problem

Existing technologies fail to ensure that wheels of centring devices in pipelines maintain direct contact with the pipeline wall, especially in the presence of an oil film, leading to increased friction and slipping, which is critical for efficient movement and operation of tools within oil wells.

Innovation Solution

The use of expanding arms with magnetic elements on the wheels to remove the oil film and ensure direct contact with the pipeline wall, enhancing traction and allowing for bi-helicoidal movement, thereby improving the centring and pulling of tools within pipelines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If wheels are used for centring and moving tools in pipelines, then movement capability is improved, but the oil film between wheels and pipeline wall causes slipping and reduces traction

Engineering Contradiction:

Improvemovement capabilityVSAvoidtraction

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The magnetic elements on the wheels convert the harmful oil film effect into a beneficial one by using magnetic attraction to the metallic pipeline wall to eliminate the lubricating oil film and create direct contact, thereby improving traction while maintaining movement capability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention changes the physical state of the contact interface by using magnetic fields to remove the oil film, transforming the contact from lubricated (low friction) to direct metal-to-metal contact (high friction), which improves traction reliability

Inventive Principle:

Principle #35Parameter changes

2Reliability

If expanding arms with wheels are used for centring, then contact with pipeline wall is improved, but friction increases and causes slipping

Engineering Contradiction:

Improvecontact consistencyVSAvoidfriction

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The magnetic elements transform the potentially harmful high friction from direct contact into a beneficial force by using magnetic attraction to maintain consistent contact pressure and eliminate oil film, improving reliability without excessive slipping

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Force

If direct contact between wheels and pipeline wall is ensured, then traction is improved, but the oil film prevents direct contact and causes slipping

Engineering Contradiction:

ImprovetractionVSAvoidoil film interference

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The magnetic elements directly address the oil film interference by using magnetic attraction to pull the wheels toward the metallic pipeline wall, eliminating the oil film barrier and enabling direct contact for improved traction

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention replaces the mechanical contact system that fails due to oil film lubrication with a magnetic field-based system that actively removes the oil film through magnetic attraction, allowing direct mechanical contact to occur

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 magnetic elements on the wheels effectively eliminate the oil film, ensuring consistent contact and reducing slipping, thereby enhancing the movement and operational efficiency of tools within pipelines, particularly in varying diameters.

Implementation Method 1

each wheel comprises at least one magnetic element. The magnetic element can urge the wheels towards the inner surface of the pipeline, providing better traction. The at least one magnetic element of each wheel can be suitable for removing the oil film at the contact of the wheel with the inside wall of the pipeline.

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS12509949B2Device for centring and/or pulling a tool in a pipeline

Publication Date: 2025.12.30 PETROLEO BRASILEIRO SA PETROBRAS

AI summary

The present invention relates to a device for centring and pulling a tool in a pipeline, the device comprising expanding arms, with each expanding arm comprises a wheel suitable for making contact with an inside wall of a pipeline, wherein each wheel comprises at least one magnetic element.