Rigid RF Coaxial Transmission Line With Integrated Outer Conductor
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Solution Overview
Problem
Existing RF coaxial transmission lines are not designed to withstand the high structural loads and stresses associated with hydrocarbon resource recovery in subterranean formations, requiring a more robust and efficient solution.
Innovation Solution
A rigid RF coaxial transmission line composed of series of coaxial sections with a rigid outer conductor and an electrically conductive inner layer, featuring overlapping mechanical and electrical joints, to provide enhanced strength and conductivity while using fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid coaxial feed arrangement is used for subterranean applications, then structural strength is improved, but device complexity increases due to the need for separate structural and coaxial assemblies
Solution Approach 1:
The patent combines the structural tube and coaxial assembly into a single integrated component. The outer conductor of the coaxial assembly is formed as a thin-walled tube that is mechanically coupled to the structural tube, creating a unified structure that provides both mechanical strength and RF transmission functionality without requiring separate structural and coaxial assemblies.
Solution Approach 2:
The outer conductor serves dual functions: it acts as both the RF transmission conductor and provides structural support when mechanically coupled to the structural tube. This multi-functional design eliminates the need for separate structural and coaxial components, reducing overall device complexity while maintaining both mechanical strength and RF performance.
2Ease of manufacture
If aluminum is used for the coaxial assembly, then cost is reduced, but strength is insufficient to handle structural load requirements
Solution Approach 1:
The patent creates a composite structure by mechanically coupling the aluminum coaxial assembly to a steel structural tube. This composite design allows the system to leverage the cost advantages of aluminum for the coaxial portion while the steel structural tube provides the necessary structural strength to handle load requirements, achieving both economic and mechanical performance.
Solution Approach 2:
The coaxial assembly is segmented into distinct functional portions: the outer conductor that interfaces with the structural tube for mechanical support, and the inner conductor and dielectric that provide RF transmission functionality. This segmentation allows optimization of each portion for its specific function while maintaining overall system performance.
3Strength
If a structural tube with floating coaxial transmission line is used, then structural load capacity is improved, but device complexity increases due to additional support components
Solution Approach 1:
The patent merges the structural tube and coaxial assembly into an integrated unit where the outer conductor is mechanically coupled to the structural tube. This integration eliminates the need for separate floating support mechanisms, as the coupled structure naturally maintains the coaxial assembly's position and provides structural support simultaneously, reducing the number of additional support components required.
Data Source
AI summary
A rigid radio frequency (RF) coaxial transmission line to be positioned within a wellbore in a subterranean formation may include a series of rigid coaxial sections coupled together in end-to-end relation. Each rigid coaxial section may include an inner conductor, a rigid outer conductor surrounding the inner conductor, and a dielectric therebetween. Each of the rigid outer conductors may include a rigid outer layer having opposing threaded ends defining overlapping mechanical threaded joints with adjacent rigid outer layers. Each of the rigid outer conductors may also include an electrically conductive inner layer coupled to the rigid outer layer and having opposing ends defining electrical joints with adjacent electrically conductive inner layers.