Downhole Cable Jacket Structure for Lower Weight and Abrasion
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Solution Overview
Problem
Conventional polymers used in wireline and slickline cables are expensive, heavy, and prone to abrasion, leading to increased manufacturing costs and cable damage.
Innovation Solution
The cables incorporate an inner core surrounded by multiple polymer jackets, including an inner and outer jacket made from aliphatic polyketone polymer, ethylene-propylene copolymer, polyolefin elastomer, or cross-linkable polyethylene, with armor strength members to enhance durability and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymers (fluor-based, polyolefin-based, poly-condensates) are used in cable jackets, then the cable has good mechanical properties and electrical insulation, but the manufacturing cost increases and the cable weight increases
Solution Approach 1:
The patent changes the material parameter by substituting conventional high-density polymers with polyethylene and polypropylene that have lower density but comparable mechanical properties. This parameter change reduces both manufacturing cost and cable weight while maintaining the required reliability for downhole operations
Solution Approach 2:
The patent employs composite material structures with multiple polymer jackets (inner jacket, intermediate jacket, outer jacket) made from different polymer compositions. This composite approach allows optimization of each layer for specific functions while achieving overall cost-effectiveness and performance balance
2Strength
If conventional polymers are used in cable jackets, then the cable has adequate structural integrity, but the cable is subject to abrasion damage in downhole operations
Solution Approach 1:
The patent uses composite material construction with multiple polymer jackets where each layer provides specific protective functions. The outer jacket material is selected to provide abrasion resistance while inner layers provide structural integrity, creating a composite system that addresses both requirements simultaneously
Solution Approach 2:
The patent applies local quality by differentiating the material properties of each jacket layer. The outer jacket is optimized for abrasion resistance to protect against external damage, while inner jackets are optimized for structural integrity and electrical insulation, ensuring each part has the specific quality needed for its function
3Strength
If conventional polymers with high density are used, then the cable has good mechanical strength, but the cable weight increases
Solution Approach 1:
The patent changes the density parameter by selecting polyethylene and polypropylene materials with lower density compared to conventional fluor-based and poly-condensate polymers. This parameter change directly reduces cable weight while the multi-layer composite structure maintains the necessary mechanical strength through optimized layer configurations
Data Source
AI summary
In some embodiments, a cable can include an electrically conductive inner core. A first insulation layer can be disposed about the inner core. An electrically conductive layer can be disposed about the first insulation layer. A second insulation layer can be disposed about the electrically conductive layer. A first polymer jacket can be disposed about the second insulation layer. The first polymer jacket can include a first layer of armor strength members disposed therein. A second polymer jacket can be disposed about the first polymer jacket. The second polymer jacket can include a second layer of armor strength members disposed therein. An outer polymer jacket can be disposed about the second polymer jacket. At least one of the first polymer jacket, the second polymer jacket, and the outer polymer jacket can be formed from an aliphatic polyketone polymer, an ethylene-propylene copolymer, a polyolefin elastomer, a polypropylene, or a cross-linkable polyethylene.