Wellbore Electrical Isolation System for Coaxial Power Distribution
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Solution Overview
Problem
Current wellbore electrical systems are limited in powering multiple downhole gauges and actuators beyond a single installation point due to insufficient voltage and current across the tubing string and casing, restricting the deployment of additional electrical loads.
Innovation Solution
A wellbore electrical isolation system comprising an electrically conductive tube with an insulating layer, a centralizer, and insulating confinement devices, which allows for electrical isolation between the tubing string and casing, enabling separate coupling of loads and maintaining physical separation to facilitate coaxial transmission and power additional loads distally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrical connection is maintained between tubing string and casing for single point power supply, then voltage and current are sufficient at installation point, but additional gauges and actuators cannot be powered distally due to insufficient voltage and current
Solution Approach 1:
The patent divides the wellbore into multiple electrically isolated sections using insulating layers and confinement devices. Each section can independently power its own gauges and actuators through the tubing-casing coaxial transmission, eliminating the limitation of single-point power supply and enabling distributed powering along the wellbore.
Solution Approach 2:
The patent introduces insulating layers and confinement devices as intermediaries to create electrically isolated sections. These intermediaries enable the tubing and casing to function as separate conductors for multiple independent power circuits, allowing additional loads to be powered distally without interfering with existing connections.
2Adaptability or versatility
If insulating layer is applied to tube to achieve electrical isolation, then multiple electrical loads can be powered separately, but device complexity increases
Solution Approach 1:
The patent designs the insulating layer and confinement devices to serve multiple functions simultaneously: electrical insulation, mechanical positioning, and structural support. This multi-functionality reduces the need for separate components and simplifies the overall system despite enabling multiple isolated power circuits.
Solution Approach 2:
The patent employs a nested structure where the insulating layer is applied to the tube, confinement devices are positioned around the insulating layer, and the entire assembly is placed within the wellbore. This nested arrangement consolidates multiple isolation functions into a compact integrated system.
3Shape
If centralizer is used to maintain physical separation between tube and casing, then coaxial transmission is enabled, but movement of centralizer must be confined
Solution Approach 1:
The patent combines the centralizer function with confinement devices into a single integrated component. The confinement devices not only limit the longitudinal movement of the centralizer but also provide additional electrical insulation and structural support, reducing the need for separate components.
Solution Approach 2:
The patent uses thin insulating layers and flexible confinement structures that can accommodate thermal expansion and mechanical stresses while maintaining the coaxial alignment and electrical isolation. These thin-film solutions reduce material usage and system complexity compared to rigid alternatives.
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
Enables the powering of multiple electrical loads along the wellbore by creating a coaxial transmission line, allowing for the deployment of additional sensors and actuators without the need for electrical wiring, thereby enhancing the operational capabilities of wellbore systems.
Implementation Method 1
The centralizer and the tube may be electrically isolated from each other by the insulating layer covering at least a portion of the tube
Implementation Method 2
Electrical isolation of the tubing string from the casing may facilitate powering one or more electrical loads disposed within the wellbore via a coaxial transmission line formed by the casing and the tubing string
Data Source
AI summary
This disclosure relates to a wellbore electrical isolation system and method. The system may comprise an electrically conductive tube, an insulating layer covering at least a portion of the tube, an electrically conductive centralizer, electrically insulating confinement devices, and/or other components. In some implementations, the system may be configured to electrically isolate one or more sections of an electrically conductive well tubing string from an electrically conductive wellbore casing. In some implementations, a well may include one or more wellbore electrical isolation systems. Electrical isolation of the tubing string from the casing may facilitate powering one or more electrical loads disposed within the wellbore via a coaxial transmission line formed by the casing and the tubing string.