Collar Positioning in Corrosion Logs for Multi-Casing Wells
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Solution Overview
Problem
Corrosion detection in multi-pipe configurations, particularly in downhole casing strings, is complex due to the difficulty in managing and interpreting data from electromagnetic logging tools, especially when multiple casing strings are employed together, as the presence of collars can obscure signals and make it challenging to accurately determine pipe thickness and corrosion levels.
Innovation Solution
The use of a segmented magnetic core in corrosion detection tools to reduce sensitivity to the diameter of the innermost pipe, allowing for effective operation in multiple concentric pipe configurations, combined with a transmitter-receiver system that includes a solenoid transmitter and magnetic core to enhance signal strength and reduce cross-talk, and an information handling system to process and analyze data for precise collar location and pipe thickness assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic logging tools are used to detect corrosion in multi-pipe configurations, then corrosion monitoring capability is provided, but signal interpretation becomes complex and inaccurate due to collar interference
Solution Approach 1:
The patent segments the magnetic core into multiple discrete segments arranged in an array. Each segment contributes to the overall magnetic field generation, allowing the system to maintain a substantial magnetic field while reducing sensitivity to pipe diameter variations. This segmentation enables more reliable corrosion detection in multi-pipe configurations by distributing the magnetic field generation across multiple sources rather than relying on a single core.
Solution Approach 2:
The patent changes the physical parameters of the magnetic core by dividing it into segments and arranging them in specific geometric patterns. This parameter change modifies the magnetic field distribution characteristics, reducing the field's sensitivity to pipe diameter variations while maintaining effectiveness for corrosion detection in complex multi-pipe environments.
2Stability of the object's composition
If a segmented magnetic core is used to reduce sensitivity to pipe diameter variations, then tool response stability improves, but device complexity increases
Solution Approach 1:
The magnetic core is divided into multiple segments that can be independently positioned and configured. This segmentation provides stability to the tool response across varying pipe diameters while the modular nature of segments allows for relatively simple manufacturing and assembly compared to creating a single complex monolithic core structure.
Solution Approach 2:
The segmented magnetic core design creates a multi-functional system that can adapt to different pipe configurations and diameters. The same segmented array structure serves multiple purposes: generating magnetic fields, reducing diameter sensitivity, and maintaining stability across various operational conditions, thereby justifying the increased structural complexity through enhanced versatility.
3Adaptability or versatility
If multiple casing strings are employed in well installations, then operational flexibility is improved, but corrosion detection data interpretation becomes more complex
Solution Approach 1:
The segmented magnetic core system provides locally optimized magnetic field generation at different positions around the tool. This local quality enhancement allows the system to effectively penetrate and detect corrosion in multiple concentric casing strings simultaneously, managing the complexity of multi-pipe data through spatially distributed measurement capabilities.
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 approach enables more accurate and efficient corrosion detection by stabilizing tool responses across varying pipe diameters and temperatures, allowing for precise identification of collar positions and improved assessment of pipe thickness, even in complex multi-pipe configurations, thereby enhancing the reliability of corrosion monitoring.
Implementation Method 1
One type of corrosion detection tool uses electromagnetic (EM) fields to estimate pipe thickness or other corrosion indicators. As an example, an EM logging tool may collect EM log data
Implementation Method 2
a transmitter-receiver system that includes a solenoid transmitter and magnetic core to enhance signal strength
Implementation Method 3
The use of a segmented magnetic core in corrosion detection tools to reduce sensitivity to the diameter of the innermost pipe
Data Source
AI summary
A method and system for location a collar. A method for locating a collar may comprise disposing a logging tool within a plurality of concentric pipes in a wellbore, measuring one or more wellbore parameters, creating a corrosion detection tool log from the measuring one or more wellbore parameters, processing the corrosion detection tool log to determine a location and a position of a plurality of collars on the concentric pipes, and adjusting the corrosion detection tool log to account for the location and position of the plurality of collars. A system for locating a collar may comprise a conveyance line, a logging tool, and an information handling system. The information handling system may be capable to measure one or more wellbore parameters, create a corrosion detection tool log from the measuring one or more wellbore parameters, and document the location and the position of the plurality of collars.