High-Temperature Cable Inorganic Tape Armor
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Solution Overview
Problem
High-temperature cables used in deep drilling operations often deform or fail due to heat exposure and weight, leading to inefficiencies and insulation resistance issues, as conventional materials like PFA fail above 250°C.
Innovation Solution
A high-temperature cable design featuring an inorganic tape wrapped around the conductor, with an armor shell applied externally, utilizing materials like mica or ceramic for temperatures up to 1000°C, and optionally including additional inorganic layers for enhanced thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials like PFA are used for cable insulation, then the cable can be manufactured with standard materials and processes, but the cable fails when temperatures exceed 250°C
Solution Approach 1:
The patent applies composite materials by combining organic insulation layers with inorganic protective layers (mica tape and ceramic coating). This composite structure allows the cable to withstand temperatures up to 1000°C while maintaining electrical insulation properties, resolving the contradiction between using standard materials and achieving high-temperature resistance.
2Reliability
If metal casing is used to prevent heat transfer, then the cable is protected from heat and physical damage, but the cable weight increases causing structural distortion in vertical drilling applications
Solution Approach 1:
The patent replaces heavy metal casing with thin inorganic layers (mica tape and ceramic coating) that provide thermal and mechanical protection without significant weight increase. These flexible thin-film structures maintain cable integrity under thermal stress while avoiding the weight-induced structural distortion problems of metal casings.
3Shape
If the cable is made lighter for vertical drilling applications, then structural distortion is reduced, but thermal protection capability is compromised
Solution Approach 1:
The patent uses composite inorganic materials (mica tape wrapped around conductors with ceramic coating) that provide both thermal protection and structural integrity. This composite approach maintains cable shape and prevents deformation at high temperatures without requiring heavy metal reinforcement, thus resolving the contradiction between structural integrity and thermal protection.
4Temperature
If inorganic materials are used for thermal protection, then temperature resistance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies inorganic protective layers during the cable manufacturing process before final assembly. The mica tape is wrapped around conductors and ceramic coating is applied in advance, allowing these complex protective measures to be integrated into the manufacturing flow without requiring post-production treatment or installation complexity.
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 provides reliable thermal protection and maintains insulation resistance across a wide temperature range, preventing deformation and damage from heat and environmental factors, ensuring the cable's integrity and efficiency in extreme conditions.
Implementation Method 1
An inorganic tape is wrapped around the at least one conductor... When subjected to heat, many materials will deform or give off volatiles that will lower the insulation resistance... Materials such as perfluoroalkoxy (PFA) may be used up to temperatures of approximately 250° C., but may be unsuccessful in higher temperature
Implementation Method 2
This metal casing, for example, may seal off any gassing of the inner materials of the cable, as well as prevent rocks, sharp objects, or other potentially damaging items from causing harm to the cable
Data Source
AI summary
A high-temperature cable and a method of making the same is provided. The high-temperature cable includes at least one conductor. An inorganic tape is wrapped around the at least one conductor. An armor shell is applied exterior of the inorganic tape.