Copper Tape Cable for Wellbore Signal Transmission
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Solution Overview
Problem
Cable assemblies used in wellbore applications face signal attenuation and dissipation over long distances due to materials that are not good conductors, leading to degraded and lost signals, particularly in deep wellbores, and existing solutions like thicker cables are limited by space and cost constraints.
Innovation Solution
Incorporating an extra conductive layer within the cable assembly, such as copper tape, to reduce signal attenuation and allow deeper wellbore deployment without altering existing downhole equipment or increasing costs, by using a cable with a center conductor, insulator, and outer conductive casing to enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thicker cables are used to reduce signal attenuation, then signal transmission quality improves, but space availability worsens and cost increases
Solution Approach 1:
The cable structure is segmented into multiple functional layers: center conductor, insulator, copper tape shield, and outer jacket. This segmentation allows each layer to perform its specific function efficiently, with the copper tape providing enhanced signal protection without requiring the entire cable to be thicker.
Solution Approach 2:
The cable uses composite construction combining different materials (conductor material, insulating material, copper tape, and protective jacket material) to achieve optimal signal transmission and protection while maintaining a compact overall diameter that fits within available space constraints.
2Reliability
If thicker cables are used to reduce signal attenuation, then signal transmission quality improves, but cost increases due to alternate connections required
Solution Approach 1:
By segmenting the cable into standardized functional layers with the copper tape shield, the design allows for modular manufacturing and assembly, reducing the need for custom alternate connections and associated costs.
3Device complexity
If conventional cable structures are used, then simplicity is maintained, but signal attenuation over long distances increases
Solution Approach 1:
The cable is divided into distinct functional segments (center conductor, insulator, copper tape, outer jacket) where each segment contributes to overall performance, achieving low signal attenuation through the copper tape shield while maintaining a relatively simple overall structure.
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 extra conductive layer significantly reduces signal loss over distance, enabling reliable communication and power transmission in deep wellbore applications without the need for additional downhole devices or increased costs, by acting as a medium of low resistance for signaling currents.
Implementation Method 1
The cable may comprise a center conductor, an insulator, where the insulator may be disposed about the center conductor, a copper tape, where the copper tape may be disposed about the insulator, and an outer conductive casing, wherein the outer conductive casing may be disposed about the conductive layer
Data Source
AI summary
A cable assembly, well system, and method of use. A cable assembly may comprise a protective covering and a cable disposed in the protective covering. The cable may comprise a center conductor, an insulator. The insulator may be disposed about the center conductor. The cable may comprise an extra conductive layer, where the extra conductive layer may comprise copper and may be disposed about the insulator, and an outer conductive casing. A well system may comprise a cable assembly, which may comprise a protective covering, and a cable. The well system may further comprise downhole equipment disposed in a wellbore, wherein the downhole equipment may be connected to the cable assembly. A method for using a cable assembly in a well may comprise providing the cable assembly, inserting the cable assembly in the well, and sending a signal current through the cable assembly from the surface to downhole equipment.