Segmented Armor Downhole Cable for Low-Friction Well Installation
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Solution Overview
Problem
Existing downhole cable systems for the oil and gas industry face challenges in installing and managing downhole devices due to weight and friction issues, particularly in horizontal and deviated wells, where thousands of meters of cable are required, leading to difficulties in mechanical operations and maintenance.
Innovation Solution
A lightweight, flexible, and robust cable apparatus featuring an armor layer made of fiber-reinforced composite materials with segments that can move along the longitudinal axis, providing reduced friction and increased flexibility, and an electrical forward path for power and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional slickline or wireline cable systems are used in horizontal and deviated wells, then the cable can provide mechanical support and electrical communication, but the weight and friction of the cable system become excessive, making installation and retrieval difficult
Solution Approach 1:
The cable employs a composite construction with a polymer outer coating, metal armor layer (steel wire or strip), and core elements. This composite structure reduces overall weight compared to traditional all-steel cables while maintaining the necessary mechanical strength and friction reduction properties for installation in horizontal and deviated wells
Solution Approach 2:
The cable is designed with segmented armor layers consisting of multiple steel wires or strips arranged in specific patterns. This segmentation allows the cable to flex and bend more easily during installation and retrieval, reducing friction against the wellbore wall while maintaining structural integrity
2Length of moving object
If the cable length is increased to reach distant downhole locations in horizontal wells, then the cable can access deeper zones, but the accumulated weight and friction make mechanical operations increasingly difficult
Solution Approach 1:
The cable features a flexible polymer outer coating and thin metal armor layers that allow the cable to bend and conform to the wellbore geometry. This flexibility reduces friction during installation in long horizontal sections by allowing the cable to follow the well path more closely without excessive contact pressure
Solution Approach 2:
The cable design incorporates dynamic elements such as flexible armor segments and polymer coatings that allow the cable to adapt its configuration during movement. This dynamic behavior reduces friction forces during installation and retrieval by minimizing static contact points and allowing the cable to glide more smoothly through the wellbore
3Ease of operation
If the cable is made more flexible to ease installation in deviated wells, then the cable can navigate wellbore geometry more easily, but the structural integrity and strength may be compromised
Solution Approach 1:
The cable combines polymer materials with metal armor elements to achieve both flexibility and strength. The polymer outer coating provides flexibility and corrosion resistance, while the embedded steel wire or strip armor layer provides tensile strength and structural integrity, allowing the cable to navigate deviated well geometry without compromising load-bearing capacity
Solution Approach 2:
The armor layer is segmented into multiple steel wires or strips arranged in specific patterns around the core. This segmentation allows each element to flex independently, providing overall cable flexibility while the collective arrangement of segments maintains the necessary structural strength to support downhole devices and withstand wellbore conditions
Data Source
AI summary
The invention provides a cable for use in a wellbore. The cable comprises a core and an armor layer surrounding the core. The armor layer comprises a plurality of segments. Each segment is configured to be axially displaceable along a longitudinal axis of the cable relative to one another.