Downhole Magnetic Sensor Orientation Detection
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Solution Overview
Problem
Current technologies fail to accurately determine the depth and orientation of features in wellbores, such as windows in multi-lateral wells, especially when multiple features are closely spaced and located far below the surface, leading to costly errors in downhole operations.
Innovation Solution
A downhole device equipped with magnetic field sensors and orientation sensors that monitor the inherent magnetic field of ferrous tubing, allowing for precise determination of feature depth, orientation, and shape by correlating sensor outputs, facilitating accurate location and operation in a single run.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical devices with engaging members are used to locate downhole features, then the device can determine when a feature is reached, but it cannot identify orientation or distinguish between multiple closely spaced features
Solution Approach 1:
The patent replaces mechanical engaging members with magnetic field sensors that detect changes in magnetic flux caused by ferrous features. This substitution enables non-contact detection of feature depth, orientation, and identity through magnetic field variations, providing comprehensive information without mechanical engagement.
Solution Approach 2:
The patent introduces magnetic field sensors as an intermediary between the detection device and the ferrous features. The sensors detect magnetic flux changes caused by the features, translating physical presence into measurable electrical signals that provide detailed information about depth, orientation, and feature characteristics.
2Measurement precision
If pipeline pigs with induced magnetic fields are used to detect anomalies, then cracks can be detected, but the devices have high power requirements and do not provide rotational orientation data
Solution Approach 1:
The patent utilizes the inherent magnetic field of the ferrous tubing itself as the detection target, rather than requiring an external magnetic field source. The magnetic field sensors detect variations in the tubing's own magnetic field caused by features such as windows or anomalies, eliminating the need for high-power magnetic field generation equipment while still providing detailed detection capability.
3Measurement precision
If CCLs are used to detect casing collars, then depth information can be obtained, but no orientation data is provided and the method is ineffective for modern casings without collars
Solution Approach 1:
The patent creates a universal detection method that works with any ferrous feature in the casing, regardless of whether it is a traditional collar, a window, or other structural elements. The magnetic field sensors detect variations in the magnetic field caused by any ferrous material configuration, making the system adaptable to both legacy and modern casing designs without requiring specific feature types.
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 precise and cost-effective determination of feature depth and orientation, reducing operational errors and enhancing the efficiency of downhole operations by providing real-time feedback for accurate placement of tools and equipment.
Implementation Method 1
at least one magnetic field sensor for monitoring the inherent magnetic field of the ferrous tubing; determine the presence of the feature based on the inherent magnetic field of the ferrous tubing detected by the at least one magnetic field sensor; the feature having an inherent magnetic field less than the inherent magnetic field of the ferrous tubing
Data Source
Figure 1
Figure 2
Figure 3~12
AI summary
The invention relates to a device for determining the depth and orientation of a feature in a wellbore, and to a corresponding method. It also relates to a downhole apparatus for performing an operation in a well comprising a device for determining the depth and orientation of a feature in a wellbore and a device for performing the operation. In an embodiment, a downhole device (42) for determining the depth and orientation of a feature (24, 26, 28) in a wellbore (12) containing a ferrous tubing (14) is disclosed, the device comprising: at least one magnetic field sensor (44) for monitoring the inherent magnetic field of the ferrous tubing so that the presence of the feature can be detected; and at least one orientation sensor (48) for determining the orientation of the device within the wellbore. An output from the at least one magnetic field sensor is correlated with an output from the at least one orientation sensor so that the orientation of the feature detected by the at least one magnetic field sensor within the wellbore can be determined.