Permeable Core RFT Probe for Thick Casing Thickness Measurement
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Solution Overview
Problem
Remote field eddy current (RFEC) corrosion assessment faces challenges in measuring casing thicknesses greater than three inches, as lower frequency signals may not pass through thick casings at ordinary signal strength levels, limiting the effectiveness of existing RFT probes.
Innovation Solution
The use of a permeable core in the transmitter winding of an RFT probe to generate a stronger magnetic field, which is then compensated for by a monitor winding to normalize the impedance, allowing for accurate thickness measurement and corrosion detection in thicker casings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If lower frequency signals are used to measure thicker casings, then signal penetration through thick casings is improved, but signal strength decreases making recognition difficult
Solution Approach 1:
A permeable core is introduced as an intermediary element within the transmitter to concentrate and enhance the magnetic field. The core acts as a mediator that transforms the weak low-frequency signal into a stronger, more penetrative magnetic field that can reliably pass through thick casings while maintaining signal recognition capability.
Solution Approach 2:
The patent changes the physical parameters of the transmitter by incorporating a permeable core with high magnetic permeability. This parameter change concentrates the magnetic flux and significantly enhances the magnetic field strength, enabling the system to overcome the signal weakness issue when using lower frequencies for thick casing measurement.
2Reliability
If a permeable core is added to enhance magnetic field strength, then measurement capability for thick casings is improved, but device complexity increases
Solution Approach 1:
The permeable core serves multiple functions simultaneously: it concentrates the magnetic field, enhances signal penetration through thick casings, and provides a reference for normalization. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The monitor winding wrapped around the permeable core automatically measures the magnetic field strength at the core, providing self-diagnostic capability. This self-measurement enables automatic normalization and compensation, reducing the need for external calibration equipment and simplifying the overall measurement system.
3Device complexity
If ordinary signal strength levels are used, then device simplicity is maintained, but signal penetration through thick casings is insufficient
Solution Approach 1:
The permeable core acts as a field-concentrating intermediary that transforms ordinary signal strength into a high-intensity magnetic field. This mediator enables the system to maintain simplicity in signal generation while achieving the field strength necessary for measuring thick casings.
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 permeable core enhances the magnetic field strength, enabling the measurement of thicker casings and compensating for field distortions, thus allowing for effective corrosion assessment in casings that would be infeasible with non-permeable core probes, improving signal-to-noise ratio and reducing logging time.
Implementation Method 1
a transmitter having a permeable core. The transmitter also includes a transmission winding wrapped around the permeable core where the transmission winding is configured to generate a magnetic field
Implementation Method 2
The permeable core enhances the magnetic field strength, enabling the measurement of thicker casings
Implementation Method 3
The monitor winding is configured to measure a normalization voltage based at least in part on a strength of the magnetic field at the monitor winding
Implementation Method 4
The RFT probe creates a field and detects thickness and/or corrosion of the one or more casings by detecting changes in the created field
Data Source
AI summary
Systems, apparatuses, and methods for measuring material thickness of one or more casings using a permeable core are presented. A magnetic field is generated using a permeable core and transmitted through one or more casings. Moreover, one or more receivers measure changes to the magnetic field.