Magnetic Field Detection for Well Tool Positioning
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Solution Overview
Problem
During oil and gas well work-overs and interventions, there is a lack of certainty in locating line-attached tools, leading to potential damage or loss due to false tension readings and misapprehensions about the tool's position, which can result in incorrect operation of pressure control mechanisms.
Innovation Solution
A system comprising a magnetic-field generator and sensor apparatus positioned above the surface of the well, generating a magnetic field to detect changes in magnetic properties and dimensions of line-attached tools as they move through the well, providing accurate location information to operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tension-based detection method is used to locate line-attached tools, then operational simplicity is maintained, but measurement precision and reliability deteriorate due to false tension readings and misapprehension of tool position
Solution Approach 1:
The patent replaces the mechanical tension-based detection method with a magnetic field-based detection system. Magnetic-field generators and sensors create and detect magnetic fields that interact with the line-attached tool, providing accurate location information without relying on mechanical tension readings. This substitution eliminates false contacts and provides precise measurement of tool position, dimensions, and orientation.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the detection system and the line-attached tool. The magnetic-field generators create magnetic fields that penetrate through the lubricator and line, and the sensors detect changes in these fields caused by the tool's presence and position. This intermediary approach allows non-contact, accurate detection of tool location without mechanical interaction.
2Reliability
If pressure control valves are closed based on presumed tool location, then pressure isolation is achieved, but harmful factors increase due to potential tool damage, line cutting, and tool loss if location is incorrect
Solution Approach 1:
The patent implements a feedback system where magnetic-field sensors continuously monitor the position of the line-attached tool and provide real-time location information to operators. This feedback ensures that pressure control valves are closed only when the tool is confirmed to be at the correct location, eliminating the risk of closing valves based on false tension readings. The system provides continuous verification of tool position before and during pressure isolation operations.
Solution Approach 2:
The patent performs preliminary detection of tool location using magnetic-field generators and sensors before closing the pressure control valves. The system identifies the tool's position, dimensions, and orientation in advance, allowing operators to confirm correct tool placement before initiating pressure isolation. This preliminary action prevents harmful outcomes by ensuring valves are closed only when the tool is properly positioned.
3Reliability
If magnetic-field detection system is implemented to accurately locate tools, then measurement precision and reliability improve, but device complexity and initial cost increase
Solution Approach 1:
The patent designs the magnetic-field detection system to perform multiple functions: detecting tool location, measuring tool dimensions, determining tool orientation, and providing real-time position tracking. The same magnetic-field generators and sensors used for location detection also provide dimensional and orientational information, eliminating the need for separate detection systems and reducing overall device complexity.
Solution Approach 2:
The line-attached tool itself serves as part of the detection system by interacting with the magnetic fields. The tool's magnetic properties or attached magnetic elements enable it to be detected and measured without requiring additional markers or identification features. The tool's presence and characteristics automatically influence the magnetic field, providing detection information without external assistance.
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
Enhances operator certainty about the tool's location, reducing false contacts and preventing damage or loss by accurately identifying the tool's position and dimensions, thereby improving the safety and efficiency of well operations.
Implementation Method 1
a body for housing at least one magnetic-field generator and at least one magnetic-field sensor
Implementation Method 2
The tubular portion has a bore for receiving the line-attached tools and the sensor is configured for detecting at least one dimension of the line-attached tool while approaching, moving through or moving away from the body
Data Source
AI summary
The present disclosure provides a system, an apparatus and a method for detecting line-attached tools in an above-surface portion of a well for use during well-work overs and/or interventions. The system includes the apparatus which comprises: a body for housing at least one magnetic-field generator and at least one magnetic-field sensor; and a tubular portion that is configured to be housed within the body. The tubular portion has a bore for receiving the line-attached tools and the at least one magnetic-field sensor is configured for detecting changes in the magnetic field caused by the line-attached tool approaching, moving through and/or moving away from the body. The system may further include a processor unit for receiving one or more signals from the at least one magnetic-field sensor and for determining the location and/or one or more dimensions of the line-attached tool while approaching, moving through or moving away from the body.