Polymer-Bonded Metallic Elements for Oilfield Cable Reliability
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Solution Overview
Problem
Oilfield cables face issues with air gaps forming between metallic and polymeric components due to mechanical stress, leading to corona development and gas migration, which can result in hydrogen sulfide attack on metals, causing failures in harsh well environments.
Innovation Solution
The surface of metallic elements is modified through heating and exposure to a heat source, such as infrared, to facilitate bonding with a polymeric layer, preventing separation and gas migration, using specific metals and polymers with adhesion promoters to ensure continuous bonding and chemical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard galvanized improved plow steel (GIPS) armor wires are used as strength members, then electrical conductivity is maintained, but hydrogen sulfide attack causes failures in harsh well environments
Solution Approach 1:
The patent uses composite material structures where corrosion-resistant metals (such as stainless steel, aluminum, or aluminum alloys) are combined with polymer insulation layers. This composite approach provides both mechanical strength and chemical resistance to hydrogen sulfide attack, while maintaining electrical conductivity through the metallic core.
Solution Approach 2:
The patent changes the material parameters by selecting metals with specific properties (corrosion resistance, electrical conductivity, mechanical strength) rather than using standard GIPS. This includes using stainless steel grades or aluminum alloys that have proven resistance to H2S environments while maintaining the necessary electrical and mechanical properties.
2Reliability
If polymer insulation is applied to metallic strands, then electrical insulation is provided, but air gaps form between polymer and metal due to mechanical stress and thermal expansion
Solution Approach 1:
The patent applies preliminary actions by treating the metal surface before polymer application. This includes surface roughening, plasma treatment, or applying adhesion promoters to the metal surface beforehand, which creates better bonding conditions and prevents air gap formation during subsequent mechanical stress or thermal cycling.
Solution Approach 2:
The patent applies local quality by creating different surface properties at the metal-polymer interface compared to the bulk materials. The interface region is specifically modified with adhesion promoters or surface treatments that enhance bonding locally, while the bulk materials maintain their original properties for electrical conductivity and mechanical strength.
3Object-affected harmful factors
If air gaps form at the polymer-metal interface, then corona discharge occurs and gas migration pathways are created
Solution Approach 1:
The patent takes out or eliminates the harmful air gaps from the polymer-metal interface through improved bonding techniques. By ensuring complete contact and adhesion between layers, the pathway for gas migration and corona discharge is removed, preventing hydrogen sulfide ingress and associated damage.
4Reliability
If special alloys resistant to H2S attack are used, then corrosion resistance is improved, but electrical conductivity decreases
Solution Approach 1:
The patent uses composite material structures where corrosion-resistant metals (such as stainless steel, aluminum, or aluminum alloys) are combined with polymer insulation layers. This composite approach provides both mechanical strength and chemical resistance to hydrogen sulfide attack, while maintaining electrical conductivity through the metallic core.
Solution Approach 2:
The patent changes the material parameters by selecting metals with specific properties (corrosion resistance, electrical conductivity, mechanical strength) rather than using standard GIPS. This includes using stainless steel grades or aluminum alloys that have proven resistance to H2S environments while maintaining the necessary electrical and mechanical properties.
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
This solution minimizes air gaps, reduces corona formation, and prevents hydrogen sulfide ingress, enhancing the durability and electrical conductivity of wireline cables in extreme oilfield conditions.
Implementation Method 1
The heating is performed by passing the at least one metallic element adjacent a heat source, such as an infrared heat source. The at least one metallic element is thereby heated to a temperature of about 500° F. for a time sufficient to modify the surface.
Implementation Method 2
A surface of the at least one metallic element is modified to facilitate bonding of the at least one metallic element to a polymeric layer
Data Source
AI summary
A method for manufacturing a component includes a step of providing at least one metallic element. A surface of the at least one metallic element is modified to facilitate a bonding of the at least one metallic element to a polymeric layer. The polymeric layer is then bonded to the at least one metallic element to form the component.