Wellbore Detector Assembly Scintillator Reflector Path Length
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Solution Overview
Problem
Current wellbore inspection techniques have limited penetration depths and poor defect resolution, and existing tools require extracting production tubing for inspection, leading to inefficient monitoring due to increased path lengths between the radiation source and detector.
Innovation Solution
A detector assembly with a scintillator and reflector configuration that redirects light signals to reduce the path length between the radiation source and the scintillator, allowing for closer proximity and improved signal-to-noise ratio, enabling more efficient and compact inspection tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detector element and scintillator crystal are positioned in close proximity to the radiation source, then the signal-to-noise ratio is improved and penetration depth is increased, but the path length between source and detector increases leading to diminished inspection efficiency
Solution Approach 1:
The patent positions the detector element and scintillator crystal in close proximity to the radiation source along the longitudinal axis, utilizing the radial dimension for detection. This dimensional arrangement allows the detectors to be located near the source without increasing the effective path length for radiation traversal, thereby improving signal-to-noise ratio while maintaining inspection efficiency.
2Length of moving object
If production tubing is extracted from the wellbore prior to inspection, then the path length for radiation is reduced, but the inspection process becomes more time-consuming and less efficient
Solution Approach 1:
The patent replaces the mechanical approach of extracting production tubing with an in-situ inspection method. The inspection tool is deployed through the production tubing using wireline or other conveyance methods, eliminating the need for physical extraction. This substitution maintains reduced path length while avoiding time loss associated with tubing extraction and reinstallation.
3Ease of operation
If the path length between radiation source and detector is increased, then the inspection can be performed with production tubing in place, but the signal-to-noise ratio deteriorates and penetration depth is limited
Solution Approach 1:
The patent achieves operational convenience of in-situ inspection while maintaining measurement precision by arranging the detector element and scintillator crystal in close proximity to the radiation source. This spatial configuration minimizes the effective path length for radiation detection, preserving defect resolution capability even when production tubing remains in place during inspection.
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 configuration enhances the signal-to-noise ratio and allows for deeper penetration without extracting production tubing, facilitating more effective wellbore integrity monitoring with improved defect resolution and reduced packaging costs.
Implementation Method 1
a scintillator configured to generate a light signal in response to an impinging radiation signal from an object
Implementation Method 2
a reflector operatively coupled to the scintillator and the first detector and configured to guide the light signal from the scintillator to the first detector, where the reflector is configured to redirect the first portion of the light signal by a determined amount to reduce a path length between a radiation source, the object, and the scintillator
Data Source
AI summary
A detector assembly includes a scintillator configured to generate a light signal in response to an impinging radiation signal from an object, where the scintillator has a first end and a second end. Further, the detector assembly includes a first detector disposed adjacent the scintillator and configured to receive a first portion of the light signal from the scintillator and a second detector operatively coupled to the second end of the scintillator and configured to receive a second portion of the light signal from the scintillator. The detector assembly also includes a reflector operatively coupled to the scintillator and the first detector and configured to guide the light signal from the scintillator to the first detector, where the reflector is configured to redirect the first portion of the light signal by a determined amount to reduce a path length between a radiation source, the object, and the scintillator.