EM Defect Detection Inversion for Multi-Tubular Corrosion
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Solution Overview
Problem
Corrosion of metal tubulars in oil and gas exploration and production poses challenges for effective corrosion monitoring, particularly in multi-tubular scenarios, where existing electromagnetic (EM) field measurement techniques struggle to provide meaningful and interpretable data.
Innovation Solution
The implementation of enhanced electromagnetic (EM) defect detection methods and systems that utilize a cost function with a misfit term and a stabilizing term, incorporating nominal model parameters, for accurate defect detection in downhole tubular strings, including radial one-dimensional (RID) processing and inversion options that combine measurements with prior test results to determine tubular thickness and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EM field measurement techniques are used in multi-tubular scenarios, then the measurement process is simple, but the data interpretation becomes unreliable and difficult to interpret
Solution Approach 1:
The patent segments the complex multi-tubular corrosion detection problem into distinct inversion options: a first inversion process for scenarios with one or two tubulars, and a second inversion process for scenarios with three or more tubulars. Each inversion option is tailored to specific computational constraints, dividing the overall problem into manageable parts that can be solved independently based on the number of tubulars present.
Solution Approach 2:
The patent changes the parameter of inversion complexity based on the number of tubulars detected. When three or more tubulars are present, the system automatically selects the computationally efficient second inversion option over the more accurate but computationally intensive first inversion option. This parameter-based selection adapts the solution complexity to match the problem complexity.
2Measurement precision
If the first inversion process is used for all scenarios, then measurement accuracy is maximized, but computational time and resources are excessively consumed
Solution Approach 1:
The patent applies partial action by using the simplified second inversion process when it provides sufficient accuracy for three or more tubulars, rather than always applying the more comprehensive first inversion process. This partial application of the more rigorous method prevents unnecessary computational expenditure while maintaining adequate measurement precision for the given scenario.
Solution Approach 2:
The system changes the inversion method parameter based on the number of tubulars, selecting the computationally lighter second inversion option for multi-tubular scenarios (three or more) where the first inversion would be excessively time-consuming. This parameter adaptation balances measurement precision requirements with computational resource constraints.
3Adaptability or versatility
If multiple inversion options are provided, then adaptability to different scenarios is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic selection of inversion options based on real-time detection of the number of tubulars in the borehole. The system automatically adapts its computational approach by choosing the first inversion process for one or two tubulars and the second inversion process for three or more tubulars, making the system dynamically responsive to changing operational conditions rather than statically configured.
Solution Approach 2:
The patent performs preliminary detection of the number of tubulars before selecting the inversion method. This preliminary action allows the system to pre-determine the appropriate computational approach, avoiding unnecessary complexity by selecting only the necessary inversion option for the detected scenario before proceeding with the actual corrosion measurement.
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 precise detection of defects such as corrosion along tubular strings, allowing for timely operations adjustments and improved well management by providing accurate thickness and permeability measurements, thereby enhancing the reliability of EM defect detection in complex multi-tubular environments.
Implementation Method 1
One type of corrosion detection tool uses electromagnetic (EM) fields to estimate tubular thickness or other corrosion indicators. As an example, an EM logging tool may collect EM log data, where the EM log data can be interpreted to correlate a level of flux leakage or EM induction with corrosion.
Implementation Method 2
an EM logging tool may collect EM log data, where the EM log data can be interpreted to correlate a level of flux leakage or EM induction with corrosion
Data Source
AI summary
A method includes deploying an electromagnetic (EM) defect detection tool in a borehole having one or more tubular strings. The method also includes collecting measurements by the EM defect detection tool as a function of measured depth or position. The method also includes using the measurements and a first inversion process to determine a defect in the one or more tubular strings. The first inversion process involves a cost function having a misfit term and having a stabilizing term with nominal model parameters. The method also includes performing an operation in response to the determined defect.