Shielding Rings for High-Voltage Downhole Tools
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Solution Overview
Problem
High-voltage power supplies and radiation generators in downhole tools face electrical stress issues due to close proximity of components, leading to arcing, tracking, and field emission, which compromise their effectiveness and longevity.
Innovation Solution
Implementing multiple shielding rings around high-voltage components, coupled with spark gap electrodes and insulating materials to reduce electric field stresses, and using a Cockcroft-Walton high-voltage ladder to transform input power for nuclear radiation generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high-voltage components are placed in close proximity to achieve compact downhole tool design, then device size is reduced, but electric field stresses and electrical events such as arcing and tracking increase
Solution Approach 1:
A shielding ring is introduced as an intermediary component between high-voltage components and the tool housing. The shielding ring, connected to a intermediate voltage potential, acts as a mediator that reduces electric field stresses on the housing while maintaining compact component spacing. This intermediary structure allows close proximity placement of high-voltage components without directly exposing them to the full stress of the housing ground potential.
2Reliability
If shielding components are added to reduce electric field stresses, then electrical reliability is improved, but device complexity increases
Solution Approach 1:
The shielding structure is segmented into a modular shielding ring that can be independently designed and positioned. This segmentation allows the shielding function to be separated from the main tool housing and high-voltage components, enabling independent optimization of each element. The modular ring structure reduces overall system complexity by creating a distinct, manageable shielding component rather than integrating shielding throughout the entire device.
3Reliability
If multiple shielding rings are implemented to reduce electric field stresses, then protection against electrical events is enhanced, but manufacturing complexity increases
Solution Approach 1:
The shielding ring is designed to perform multiple functions simultaneously: it provides electric field stress reduction, serves as a structural support element, and acts as an electrical shield. By combining these functions into a single component, the design reduces the number of separate parts that would need to be manufactured and assembled, thereby simplifying the manufacturing process while maintaining comprehensive protection against electrical events.
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 solution effectively reduces electric field stresses and prevents electrical events, enhancing the reliability and longevity of downhole tools by directing electrical discharges away from sensitive components and maintaining a stable environment for radiation generation.
Implementation Method 1
The voltage multiplier may transform input power to the downhole tool from a first voltage to a second voltage higher than the first
Implementation Method 2
The downhole tool may also include multiple shielding rings surrounding at least the voltage multiplier to reduce electric field stresses within the downhole tool
Implementation Method 3
The spark gap electrodes may propagate an electric arc to ground
Implementation Method 4
The downhole tool may also include an insulator located between the shielding rings and the housing
Data Source
AI summary
A downhole tool may include a voltage multiplier within a housing. The voltage multiplier may transform input power to the downhole tool from a first voltage to a second voltage higher than the first. The downhole tool may also include multiple shielding rings surrounding at least the voltage multiplier to reduce electric field stresses within the downhole tool. Additionally, the downhole tool may include an insulator located between the shielding rings and the housing.