Downhole X-ray Imaging Tool with Radial Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current downhole imaging tools in the hydrocarbon industry rely on radioactive sources, which are subject to stringent regulations and pose challenges in generating and detecting suitable X-rays for effective downhole imaging.
Innovation Solution
A downhole X-ray imaging tool equipped with an X-ray tube and sideways-looking photon detectors housed in a high-strength steel pressure housing with boron carbide or beryllium windows, featuring radial shielding and a pinhole camera for focused X-ray emission and detection, enabling high-resolution imaging of up to 100×100 pixels in both cased and uncased boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radioactive sources are used for downhole imaging, then imaging capability is achieved, but regulatory restrictions and safety issues worsen
Solution Approach 1:
The patent extracts the harmful radioactive source from the imaging system and replaces it with an X-ray generator. The X-ray tube generates X-rays on-demand through electrical power, eliminating the need for radioactive materials while maintaining imaging functionality. This resolves the contradiction by removing the regulatory burden while preserving the core imaging capability.
Solution Approach 2:
The patent changes the fundamental parameter of radiation generation from radioactive decay (ind uncontrollable) to controlled X-ray generation (controllable). By using an X-ray tube with adjustable voltage and current parameters, the system achieves imaging capability without the regulatory restrictions associated with radioactive sources.
2Measurement precision
If X-ray generator is implemented downhole, then imaging resolution is improved, but device complexity increases
Solution Approach 1:
The patent nests the X-ray tube and detector array within a compact cylindrical housing that integrates multiple functions. The detector array is positioned in a semi-circular configuration around the X-ray source, with each detector element precisely positioned to capture scattered X-rays. This nested arrangement achieves high imaging resolution while constraining the overall device size and complexity.
Solution Approach 2:
The patent uses a two-dimensional array of detectors arranged in a semi-circular pattern around the X-ray source. This spatial arrangement in multiple dimensions allows simultaneous capture of scattered radiation from different angles, achieving high-resolution cross-sectional imaging without requiring complex mechanical scanning mechanisms.
3Object-affected harmful factors
If high-strength steel housing with boron carbide windows is used, then radiation shielding is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent employs a composite housing structure combining high-strength steel for mechanical integrity and radiation shielding, with boron carbide or beryllium windows for selective X-ray transmission. The steel housing provides structural strength and shields against stray radiation, while the thin boron carbide windows (0.002-0.006 inches thick) allow controlled X-ray passage to detectors. This composite approach achieves effective radiation shielding while managing manufacturing complexity through specialized but manageable material integration.
4Measurement precision
If pinhole camera geometry is implemented, then X-ray focus and detection precision are improved, but device complexity increases
Solution Approach 1:
The patent uses a pinhole aperture as an intermediary element between the X-ray source and detector array. This simple geometric feature (a small hole in a shielding wall) acts as a spatial filter and collimator, defining precise measurement geometry without requiring complex optical components. The pinhole creates well-defined paths for scattered X-rays to reach specific detectors, improving detection precision while adding minimal complexity to the overall system.
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
The tool provides real-time imaging and density measurements, overcoming regulatory issues and achieving effective X-ray generation and detection, suitable for various applications including reservoir evaluation and casing inspection.
Implementation Method 1
an X-ray source, preferably an X-ray tube capable of generating a continuous electron current of at least 100 microamperes and operating at voltages of at least 50 kV
Implementation Method 2
which permit low energy X-rays to pass through the windows with little attenuation
Implementation Method 3
at least one sideways-looking photon detector axially below but radially aligned with the first window(s)
Data Source
Figure 1~2
AI summary
An X-ray downhole imaging tool is provided and includes an X-ray tube capable of operating at least at 50 KeV and emitting at least one hundred micro-amperes of continuous electron current and a radiation detector axially displaced from the X-ray tube, at least partially shielded therefrom and radially directed. In certain embodiments, the radiation detector includes a microchannel plate and a resistive anode. In certain embodiments, a second detector which is axially directed is also provided.