Multi-Layer Power Cable for ESP Systems Resisting Gas Decompression
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Solution Overview
Problem
Electric submersible pumping systems face challenges with cables that have poor resistance to well fluids and are susceptible to rapid gas decompression events, leading to reliability issues and increased deployment costs due to the need for rigs in hydrocarbon well applications.
Innovation Solution
A power cable system comprising multiple layers of conductors and materials, including insulation, fluid barriers, and wire armor, designed to provide structural support and electrical power to electric submersible pumping systems while resisting well fluids and protecting against rapid gas decompression, allowing for direct deployment without a rig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cables are used for deploying ESP systems, then deployment is possible, but the cables have poor resistance to well fluids and are susceptible to rapid gas decompression events
Solution Approach 1:
The cable is divided into multiple functional layers including conductor, insulation layer, fluid barrier layer, and protective jacket. Each layer performs a specific function: the insulation layer provides electrical isolation, the fluid barrier layer resists well fluid penetration, and the protective jacket withstands mechanical stresses from gas decompression. This segmentation allows optimization of each layer for its specific function while maintaining overall cable reliability.
Solution Approach 2:
The cable employs composite construction combining different materials with complementary properties: conductive materials for power transmission, polymer insulation for electrical isolation, fluid-resistant barrier materials for chemical protection, and reinforced protective materials for mechanical strength. This composite approach enables the cable to simultaneously achieve electrical functionality, fluid resistance, and mechanical durability in harsh downhole environments.
2Productivity
If rigs and coiled tubing are used for cable deployment, then ESP systems can be deployed, but deployment time and costs increase
Solution Approach 1:
The cable's structural parameters are optimized to withstand harsh downhole conditions directly without requiring protective deployment equipment. The reinforced protective jacket and fluid barrier layers enable the cable to resist mechanical stresses and chemical exposure, allowing direct deployment through injector heads at high speed without the need for rigs or coiled tubing, thereby improving productivity while maintaining reliability.
3Ease of manufacture
If simple cable structures are used, then manufacturing is easier, but the cables cannot provide long-term support and power delivery in harsh downhole environments
Solution Approach 1:
The cable is constructed as a segmented multi-layer structure where each layer can be manufactured and quality-tested independently. This modular approach facilitates standardized production processes while ensuring long-term reliability. Each layer's thickness and material properties are precisely controlled during manufacturing to meet performance requirements for fluid resistance, electrical insulation, and mechanical strength over extended service periods.
Data Source
AI summary
A technique facilitates construction and operation of a power cable which may be used to deploy an electric submersible pumping system downhole into a wellbore. The power cable is constructed to provide structural support of the electric submersible pumping system while also providing electric power to the electric submersible pumping system when located downhole in the wellbore. The power cable has at least one conductor and a plurality of layers selected and arranged to ensure long-term support and delivery of electrical power in the relatively harsh downhole environment.