Downhole Imaging Coding Mask for High-Resolution Wellbore Analysis
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Solution Overview
Problem
Conventional methods face challenges in producing high-resolution images of subterranean formations during drilling operations while minimizing imaging processing requirements.
Innovation Solution
A downhole imaging system comprising an imaging device with a sensor and a coding mask, configured to transmit and receive signals, and a processor that uses compressive sensing techniques to generate high-resolution images without the need for precise spatial coordinates, utilizing a coding mask with varying thicknesses to provide compressed measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging methods are used to produce high-resolution images of subterranean formations, then image quality is improved, but imaging processing requirements and resource consumption increase
Solution Approach 1:
The coding mask is positioned in front of the sensor before the imaging process begins, encoding the spatial information of the formation onto the sensor array. This preliminary encoding action allows the sensor to capture compressed measurements that inherently contain the necessary spatial information, eliminating the need for complex post-processing to reconstruct high-resolution images.
Solution Approach 2:
The system changes the parameter of measurement by using compressed sensing instead of traditional full-field imaging. The coding mask transforms the imaging problem from capturing every pixel directly to capturing compressed projections, fundamentally changing how spatial information is encoded and measured, thereby reducing processing requirements while maintaining image quality.
2Measurement precision
If conventional imaging methods are used to produce high-resolution images, then image quality is improved, but resources required for imaging increase
Solution Approach 1:
The system extracts only the essential spatial information from the formation by using compressed sensing measurements. Instead of capturing and processing every possible data point, the coding mask and sensor array extract the minimum necessary information required to reconstruct high-resolution images, thereby reducing the quantity of data and computational resources needed.
3Measurement precision
If precise spatial coordinates are used in conventional imaging, then image accuracy is improved, but processing complexity increases
Solution Approach 1:
The system replaces the mechanical approach of tracking sensor position and orientation with mathematical algorithms. Instead of using precise spatial coordinates and complex geometric reconstruction, the coding mask encodes spatial information directly into the measurement signals, allowing image reconstruction through simpler mathematical operations that do not require continuous tracking of sensor position and orientation.
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 reduces the resources required for imaging and produces higher-quality images, allowing for the generation of high-resolution 2D or 3D images of wellbores and surrounding formations with reduced processing burdens and without the need for exact depth and rotation angle information.
Implementation Method 1
a sensor (e.g., an acoustic emission transducer) and an aperture mask (e.g., a coding mask)
Data Source
AI summary
A downhole imaging system comprises an imaging device operably coupled to a drill string and configured to generate an image of a subterranean formation from within a wellbore. The downhole imaging system comprises a processor operably coupled to the imaging device. The imaging device includes a sensor comprising a transmitter and a receiver, and a coding mask located between the sensor and the subterranean formation. Downhole assemblies including such devices and methods of generating an image of a subterranean formation in a wellbore are also disclosed.