Electronic X-ray Generator for Logging-While-Drilling Tools
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Solution Overview
Problem
Conventional logging-while-drilling (LWD) tools relying on radioisotopic sources, such as 137Cs, pose handling, storage, and security challenges, and complicate abandonment in wells if the tool becomes stuck, while also limiting the ability to perform ancillary measurements like mud density determination.
Innovation Solution
The use of an electronic X-ray generator in LWD tools that emit and detect X-rays to determine formation density and lithology, allowing for improved measurement precision and the capability to perform additional measurements like mud density analysis, with enhanced collimation and depth of investigation comparable to conventional gamma-gamma density tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radioisotopic sources (137Cs) are used in LWD tools, then formation density and lithology measurements can be obtained, but handling, storage, and security challenges arise
Solution Approach 1:
The patent changes the fundamental parameter of the radiation source from radioisotopic (137Cs) to electronic (X-ray generator). This substitution eliminates the need for special handling and storage of radioactive materials while maintaining the ability to emit gamma rays for formation measurement. The electronic generator can be turned on and off as needed, providing operational flexibility that radioisotopic sources cannot offer.
Solution Approach 2:
The patent replaces the mechanical/physical radioisotopic source system with an electronic generation system. Instead of relying on the inherent radioactivity of 137Cs, the system uses an electronic generator to produce X-rays that are converted to gamma rays. This substitution eliminates the security and handling issues associated with radioactive materials while achieving the same measurement function.
2Measurement precision
If radioisotopic sources are used in LWD tools, then formation property measurements are achieved, but security measures are required for transportation and storage
Solution Approach 1:
The patent fundamentally changes the source type from radioisotopic to electronic, transforming the security requirements. Electronic X-ray generators do not require the same level of security infrastructure as radioactive sources, eliminating the need for specialized transportation containers, secure storage facilities, and regulatory compliance measures while maintaining measurement capabilities.
Solution Approach 2:
The patent extracts the radioactive material component from the measurement system. By using an electronic generator instead of 137Cs, the system removes the element that requires security measures, leaving only the electronic generation and detection components that do not pose security risks.
3Productivity
If radioisotopic sources are abandoned in wells, then tool retrieval is avoided, but environmental contamination and regulatory issues occur
Solution Approach 1:
The patent changes the abandonable component from radioactive material to electronic equipment. Electronic generators can be abandoned without creating environmental contamination or regulatory issues, as they do not contain radioactive substances. This allows the tool to be abandoned in the well if stuck, maintaining drilling operations continuity without the harmful effects of radioisotopic abandonment.
Solution Approach 2:
The patent converts the potential harm of tool abandonment into a benefit by using an electronic generator that can be safely abandoned. What was previously a harmful situation (abandoning radioactive sources) becomes a safe and acceptable scenario with electronic generators, eliminating the need for complex retrieval operations while avoiding environmental damage.
4Measurement precision
If conventional gamma-ray sources are used, then formation density measurements are obtained, but ancillary measurements like mud density are limited
Solution Approach 1:
The patent implements a universal measurement system using electronic generators that can perform multiple measurement functions. The same electronic generator and detector system can measure formation density, formation lithology, and mud density, providing versatility that conventional single-purpose gamma-ray sources cannot achieve. This multi-functionality is enabled by the flexibility of electronic generation and the capability of the detector system to analyze different radiation interactions.
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 electronic X-ray generator system provides safer handling and storage, enables precise formation property determination, and allows for ancillary measurements like mud density analysis, achieving similar or better performance than conventional 137Cs-based tools with improved safety and operational simplicity.
Implementation Method 1
Once emitted into the formation, the gamma-rays may interact with the formation through Compton scattering, which may attenuate the gamma-rays
Implementation Method 2
and/or the photoelectric effect, through which elements of the formation may absorb the gamma-rays
Implementation Method 3
The X-ray detector may detect X-rays that return to the logging-while-drilling tool after scattering in the subterranean formation
Data Source
AI summary
Logging-while-drilling tools incorporating an electronic radiation generator, such as an electronic X-ray generator, and a method for using the same are provided. One example of such a logging-while-drilling tool may include a circumferential drill collar, a chassis disposed radially interior to the drill collar, and an electronic X-ray generator and an X-ray detector disposed within the chassis. The electronic X-ray generator may emit X-rays out of the logging-while-drilling tool into a subterranean formation. The X-ray detector may detect X-rays that return to the logging-while-drilling tool after scattering in the subterranean formation, which may be used to determine a density and/or a lithology of the subterranean formation.