Magnetic Barkhausen Noise Freepoint Detection Tool
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Solution Overview
Problem
Existing methods for locating the freepoint in well pipes, where they become stuck due to rock, mud, or cement, are inefficient as they often rely on applying tension or torque, making it difficult to accurately determine the stuck point for recovery operations.
Innovation Solution
A freepoint detection tool that uses magnetic Barkhausen noise analysis by inducing an alternating magnetic field in the well pipe and detecting the resulting noise to identify regions of induced elastic deformation, allowing for precise location of the freepoint without physically stretching or twisting the pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tension or torque is applied to the well pipe to locate the freepoint, then the location of the stuck point can be determined, but the process becomes complex and requires physical deformation of the pipe
Solution Approach 1:
The patent replaces mechanical measurement systems (displacement sensors, strain gauges) with magnetic field-based Barkhausen noise detection. The tool uses magnetic sensors to detect changes in magnetic permeability caused by stress-induced elastic deformation, eliminating the need for complex mechanical measurement apparatus while maintaining measurement precision.
Solution Approach 2:
The patent utilizes changes in magnetic permeability as a parameter to detect stress-induced elastic deformation. By monitoring the Barkhausen noise signal characteristics (amplitude, frequency, energy) that change with stress level, the system can locate the freepoint without physical deformation, transforming the detection parameter from mechanical displacement to magnetic property changes.
2Measurement precision
If displacement measurements are taken during pipe stretching or twisting, then the freepoint can be located, but the method requires physical deformation and complex measurement procedures
Solution Approach 1:
The patent replaces mechanical displacement measurement systems with magnetic field-based Barkhausen noise detection. The magnetic sensors detect stress-induced changes in magnetic permeability, providing accurate freepoint location without requiring physical stretching or twisting of the pipe, thereby simplifying the operation.
Solution Approach 2:
The patent utilizes the pipe's own magnetic properties and stress-induced elastic deformation as the detection mechanism. The pipe's magnetic permeability changes naturally under stress, and the Barkhausen noise signal provides self-indicating information about the stress state and freepoint location, eliminating the need for external mechanical measurement systems.
3Measurement precision
If Hall Effect sensors or strain gauges are used to detect stress changes, then the freepoint can be identified, but the device complexity increases
Solution Approach 1:
The patent replaces mechanical strain gauges and Hall Effect sensors with magnetic field-based Barkhausen noise detection. The magnetic sensors detect changes in magnetic permeability caused by stress-induced elastic deformation, providing accurate stress detection without the complexity of mechanical sensor systems.
Solution Approach 2:
The patent utilizes changes in magnetic permeability as a parameter to detect stress-induced elastic deformation. By monitoring the Barkhausen noise signal characteristics that change with stress level, the system can identify the freepoint without requiring complex sensor systems, transforming the detection parameter from mechanical strain to magnetic property changes.
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
Enables accurate detection of the freepoint location, facilitating effective recovery operations and monitoring of stress changes along the well pipe due to geological or thermal shifts, improving the efficiency and reliability of well pipe recovery and maintenance.
Implementation Method 1
The tool is movable along a conduit or pipe and operable to generate a magnetic field
Implementation Method 2
The tool is operable to sense magnetic Barkhausen noise within a wall of the conduit in response to the tool generating the magnetic field
Data Source
AI summary
A stress detecting system and method operable to detect stresses in a conduit or pipe includes a tool movable along a conduit or pipe and operable to generate a magnetic field. The tool is operable to sense magnetic Barkhausen noise within the conduit, such as within a wall of the conduit, in response to the tool generating the magnetic field. The stress detecting system is operable to detect a change in stress along the conduit responsive to an output of the tool. The system may detect changes in stress that are caused by geological changes or shifting or thermal changes at or near the conduit to determine changes in stress along the conduit and changes in stress along the conduit over time and during use of the conduit.