Modular Magnetic Retrieval Tool with Spacer Isolation
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Solution Overview
Problem
Existing methods for removing metallic debris from tubular members, such as wellbores, are inefficient due to magnetic attraction forces that make it difficult to remove magnetic retrieval tools, and do not effectively retain magnets in a fixed array to maximize debris removal.
Innovation Solution
A magnetic retrieval tool with a tool mandrel and removable, modular magnetic bars housed in magnet pockets, using spacers and stabilizers to centralize and isolate magnets from the mandrel, allowing for easy removal and maximizing magnetic attraction and debris capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnets are placed close to the mandrel to maximize magnetic attraction for debris removal, then magnetic attraction force is improved, but the difficulty of removing the tool from the mandrel increases due to strong magnetic attraction
Solution Approach 1:
A non-magnetic spacer member is introduced between the magnets and the mandrel to prevent direct magnetic attraction between the magnets and the mandrel. The spacer acts as a mediator that allows the magnets to be positioned close to the mandrel for effective debris attraction while preventing the magnets from adhering to the mandrel, thus enabling easy tool removal.
2Productivity
If magnets are retained in a fixed array to maximize debris capture, then debris removal effectiveness is improved, but the complexity of the device structure increases
Solution Approach 1:
The magnetic retrieval tool is divided into modular components: a mandrel, multiple magnets arranged in a fixed array, and a non-magnetic spacer member. This segmentation allows each component to perform its specific function independently while maintaining the overall effectiveness of the system. The fixed array of magnets provides comprehensive debris capture, while the modular design simplifies assembly and maintenance.
3Force
If magnets are placed close to the mandrel to maximize magnetic field coverage, then magnetic field strength is improved, but magnetic interference with the mandrel increases
Solution Approach 1:
The non-magnetic spacer member serves as an intermediary that physically separates the magnets from the mandrel. This spacer allows the magnets to be positioned close to the mandrel for maximum magnetic field strength and debris attraction, while simultaneously preventing magnetic interference with the mandrel by blocking direct magnetic flux paths between the magnets and the mandrel.
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 effectively retains a plurality of magnets in a fixed array, ensuring efficient removal of metallic debris while preventing magnetic attraction issues, allowing for easy tool removal and maintaining fluid flowpaths to prevent debris dislodgment.
Implementation Method 1
removal of metallic debris from the interior of a tubular member, such as a wellbore, using magnets
Data Source
AI summary
A magnetic retrieval tool used for collecting metallic debris and material from within a wellbore or other surrounding downhole tubular. The tool includes a tool mandrel with one or more pockets formed in its outer radial surface. A removable insert resides within each pocket. Each of the inserts retains a plurality of individual magnets in a fixed array or matrix surrounding the mandrel.