Magnetized Markers for Precise Subsurface Location Identification
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Solution Overview
Problem
Accurately positioning and identifying locations along complex, long boreholes in subsurface formations is challenging due to ambiguity caused by varying rock mineral compositions and fluctuations in magnetic fields generated by the surrounding formations.
Innovation Solution
The use of magnetized markers with significantly higher magnetic susceptibility, such as spinel ferrites, to create a distinct magnetic field that can be detected, allowing for precise depth measurement and location identification along the borehole, combined with electromagnetic signatures for unique marker identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetized markers with significantly higher magnetic susceptibility (e.g., spinel ferrites) are used to create a distinct magnetic field for precise depth measurement and location identification, then measurement precision and location identification accuracy are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the magnetic susceptibility parameter of the marker material to significantly higher values (e.g., spinel ferrites with susceptibility thousands of times greater than surrounding formations), creating a distinct magnetic field signature that enables precise depth positioning and location identification despite the increased material complexity
Solution Approach 2:
The patent creates a distinct 'magnetic signature' or 'magnetic field pattern' that serves as a detectable identifier, analogous to visual color changes, allowing the marker to be uniquely identified and located with high precision by detection tools
2Measurement precision
If magnetized markers with significantly higher magnetic susceptibility are used to generate a detectable magnetic field, then location identification accuracy is improved, but the difficulty of detecting and measuring increases due to field fluctuations from surrounding formations
Solution Approach 1:
The patent applies local quality by concentrating the magnetic field enhancement specifically at the marker locations rather than throughout the entire borehole, creating localized magnetic anomalies that stand out against the background formation fields and enable precise point-location identification
Solution Approach 2:
The patent converts the potentially harmful effect of magnetic field fluctuations from surrounding formations into a benefit by using the high-susceptibility markers to create such distinct magnetic signatures that they override the background noise, turning the complex magnetic environment into a useful signaling medium
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 method provides high-precision depth positioning and location identification, reducing ambiguity and errors associated with other methods, and enabling precise placement of tools and sampling in subsurface operations.
Implementation Method 1
marking at least one location in a wellbore using a magnetized material. The magnetized material may generate a magnetic field stronger than a magnetic field generated in the wellbore by a surrounding formation
Data Source
AI summary
A method for performing a downhole operation includes marking at least one location in a wellbore using a magnetized material. The magnetized material may generate a magnetic field stronger than a magnetic field generated in the wellbore by a surrounding formation.