Eccentric Ferrite Coils for Wellbore Ranging
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Solution Overview
Problem
Existing electromagnetic ranging methods for determining the position and direction of a target wellbore are limited, especially when access to the target wellbore is not available, due to current transmitter and receiver configurations.
Innovation Solution
A system and method using an electromagnetic ranging tool with a pair of sensors separated by a small radial distance, which can rotate to determine the position and direction of a target wellbore by measuring gradient changes in the electromagnetic field, employing a coil antenna transmitter and receivers with eccentric magnetic ferrite and non-magnetic dielectric materials, and utilizing an information handling system for data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional transmitter and receiver configurations are used for electromagnetic ranging, then the system can operate with standard components, but the measurement precision and detection capability are limited when access to the target wellbore is not available
Solution Approach 1:
The patent applies asymmetry by using an eccentric ferrite core positioned offset from the center of the receiver coil. This asymmetric configuration creates a magnetic field distribution that is sensitive to the direction and distance of the target wellbore, enabling precise ranging measurements without requiring access to the target wellbore. The eccentric positioning of the ferrite core generates a characteristic signal pattern that allows determination of both position and direction.
Solution Approach 2:
The patent changes the magnetic properties parameter by introducing ferrite material with specific magnetic permeability characteristics. The ferrite core concentrates and enhances the magnetic field in specific directions, increasing the sensitivity of the receiver to electromagnetic signals from the target wellbore. This parameter change enables improved measurement precision while maintaining a relatively simple device configuration.
2Adaptability or versatility
If electromagnetic ranging is performed without access to the target wellbore, then operational flexibility is improved, but the reliability and accuracy of ranging measurements deteriorate due to signal attenuation and interference
Solution Approach 1:
The patent uses the ferrite core as an intermediary element that mediates between the receiver coil and the electromagnetic field from the target wellbore. The ferrite material concentrates and directs the magnetic flux, enhancing the coupling between the transmitter and receiver even when the target wellbore is not accessible. This intermediary structure improves signal strength and measurement reliability while maintaining operational flexibility.
Solution Approach 2:
The receiver assembly combines conductive coil material with ferrite magnetic material to create a composite structure. The ferrite core provides magnetic amplification and directional sensitivity, while the coil provides electromagnetic induction capability. This composite construction enhances the receiver's ability to detect and measure electromagnetic fields from distant or inaccessible target wellbores with improved reliability.
3Device complexity
If a simple receiver configuration is used, then device complexity is reduced, but the ability to detect gradient changes in the electromagnetic field and determine precise position and direction is compromised
Solution Approach 1:
The patent adds a magnetic dimension to the conventional electromagnetic receiver by incorporating the ferrite core. This creates a three-dimensional magnetic field interaction that provides sensitivity to both radial and azimuthal variations in the electromagnetic field. The eccentric ferrite configuration enables detection of gradient changes in multiple directions, allowing precise determination of position and direction without requiring a complex array of sensors.
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 and efficient determination of the distance and direction to a target wellbore, even when not accessible, by analyzing gradient measurements of the electromagnetic field, allowing for precise intersection or parallel drilling and collision avoidance.
Implementation Method 1
a coil antenna transmitter and receivers with eccentric magnetic ferrite
Implementation Method 2
receivers with eccentric magnetic ferrite and non-magnetic dielectric materials
Implementation Method 3
measuring gradient changes in the electromagnetic field
Data Source
AI summary
A method and system for wellbore ranging. A method for wellbore ranging may comprise placing a coil antenna in a wellbore, wherein the coil antenna may comprise one or more coil windings, and the coil windings comprise a magnetic material. The method may further comprise measuring a characteristic of an induced electromagnetic field with the coil antenna. A system for wellbore ranging may comprise an electromagnetic ranging tool which may further comprise a coil antenna, wherein the coil antenna comprises one or more coil windings, and wherein the coil windings comprise a magnetic material. The method may further comprise an information handling system, wherein the information handling system may be operable to measure a characteristic of an induced electromagnetic field with the coil antenna.