Downhole Pipe Inspection with Radial Magnetic Arms for Corrosion Sensing
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Solution Overview
Problem
Current methods for monitoring metal pipes in hydrocarbon production systems lack the sensitivity and resolution needed to effectively detect corrosion over extended periods, which can degrade pipe integrity and impact production efficiency.
Innovation Solution
An inspection tool utilizing a high permeability magnetic material core with radially extending arms and an electromagnetic (EM) technique to generate and measure eddy currents, providing azimuthal resolution and improved sensitivity for pipe characterization, allowing for more precise evaluation of metal structures within cased boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used, then the inspection process is simple, but the sensitivity and resolution for detecting corrosion are insufficient
Solution Approach 1:
The inspection tool is divided into multiple arms extending radially from a central core, with each arm equipped with its own coil assembly. This segmentation allows independent measurement of magnetic flux in different azimuthal directions, providing enhanced sensitivity and resolution for detecting corrosion defects while maintaining a modular structure that can be deployed in existing pipe inspection systems
Solution Approach 2:
The patent introduces azimuthal resolution by arranging coils radially around the pipe circumference, transforming the inspection from a single-point measurement to a multi-dimensional assessment. This dimensional expansion enables detection of corrosion patterns around the entire pipe circumference, significantly improving measurement precision without requiring excessively complex equipment
2Reliability
If monitoring is performed over extended periods, then production efficiency is maintained, but corrosion degradation impacts pipe integrity
Solution Approach 1:
The inspection tool performs measurements before significant corrosion damage occurs by enabling frequent, sensitive monitoring. The high-sensitivity electromagnetic detection system identifies early-stage corrosion defects, allowing preventive maintenance actions to be taken before pipe integrity is compromised, thus maintaining reliability while minimizing production downtime
Solution Approach 2:
The system establishes a continuous monitoring feedback loop where inspection data is collected, analyzed, and used to determine subsequent maintenance actions. This feedback mechanism enables optimized inspection scheduling based on actual pipe condition, maintaining high reliability while reducing unnecessary inspections and associated production losses
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 tool enhances the sensitivity and resolution of pipe evaluations, enabling more accurate detection of defects and improving the hydrocarbon production process by providing detailed, two-dimensional images of pipe conditions, thereby extending pipe lifespan and maintaining production efficiency.
Implementation Method 1
transmitting electromagnetic energy from a coil into a pipe to produce eddy currents
Implementation Method 2
produce eddy currents in the pipe(s). The eddy currents, in turn, produce secondary fields
Data Source
AI summary
An inspection tool apparatus includes a core having an axial length. The axial length is determined based on a desired depth of inspection radially from the core. A plurality of arms are coupled to and extend radially from the core. The core and the plurality of arms comprise a high permeability magnetic material. The core or at least one of the plurality of arms is wound by a respective coil that is positioned to receive magnetic flux that is passing through the core or at least one of the plurality of arms.