Integrated Window Pressure Housing for Logging Tools
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Solution Overview
Problem
Conventional gamma ray density drilling tools face signal deterioration due to drilling fluid ingress between the detector and the formation, which is difficult to prevent and recalibrate, leading to inconsistent measurements.
Innovation Solution
An integrated window and pressure housing design where the window section is part of the pressure housing, eliminating fluid ingress and providing a unitary, integral structure to prevent drilling fluid from reaching the detector, allowing for improved measurement accuracy and in-situ calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an elastomer pad is squeezed between the pressure housing and blade to prevent mud ingress, then measurement precision is improved, but device complexity increases and reliability decreases due to pad deterioration
Solution Approach 1:
The window section is merged with the pressure housing to form a single integrated component. This eliminates the need for separate elastomer pads and reduces the number of interfaces where mud could ingress, thereby simplifying the device structure while maintaining measurement precision.
Solution Approach 2:
The elastomer pad is removed from the detector assembly by integrating its sealing function directly into the pressure housing structure. This extraction of the separate sealing component eliminates pad deterioration issues and simplifies the overall device complexity.
2Measurement precision
If an elastomer pad is used to seal between pressure housing and blade, then measurement precision is improved, but reliability deteriorates due to pad deterioration
Solution Approach 1:
The sealing function is merged into the pressure housing structure itself, eliminating the separate elastomer pad that would deteriorate over time. This integration ensures consistent sealing performance and eliminates the reliability issues associated with pad degradation.
3Ease of manufacture
If a separate window section is used instead of integrated design, then ease of manufacture is improved, but measurement precision deteriorates due to fluid ingress
Solution Approach 1:
The window section is combined with the pressure housing into a single monolithic component. This integration eliminates gaps and interfaces where drilling fluid could ingress, ensuring measurement precision while the manufacturing complexity is managed through modern fabrication techniques.
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 design enhances measurement consistency and accuracy by eliminating fluid ingress, reducing errors in calibration, and improving reserve estimates by ensuring only minimal drilling fluid is present between the detector and the formation, allowing for reliable and precise data collection.
Implementation Method 1
The window section includes a window that provides a path for radiation to pass from outside the pressure housing to the detector
Data Source
AI summary
A detector assembly of a logging tool for disposal within a wellbore penetrating a subterranean formation and comprising: a radiation detector disposed within a pressure housing including a window section and a remaining section, the window section including a window that provides a path for radiation from outside the pressure housing to the detector, wherein the window section and the remaining section of the pressure housing form a unitary, integral structure (i) providing no space between the window section and the remaining section of the pressure housing for an influx of fluid from the wellbore between the window section and the remaining section of the pressure housing, (ii) providing a fluid impermeable structural connection between the window section and the remaining section of the pressure housing, (iii) providing a monolithic structural interface between the window section and the remaining section of the pressure housing, or (iv) combinations thereof.