Modular Opto-Electrical Cable Unit Triad Configuration
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Solution Overview
Problem
Existing opto-electrical cables for oil well logging lack sufficient mechanical strength, stability, power transmission, and telemetry capabilities, and are prone to damage during the well logging process, especially with complex and versatile downhole tools requiring tailored performance.
Innovation Solution
The development of modular opto-electrical cable units comprising interchangeable cable modules with a triad configuration of optical fiber and power conductor elements, surrounded by a casing, which includes a 'floating' tube structure and polymeric layers for enhanced mechanical strength and protection, along with copper or nickel-coated copper wires for improved electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a hepta cable configuration is used to provide strong mechanical strength, then mechanical stability is improved, but telemetry and power transmission capabilities are limited
Solution Approach 1:
The cable is divided into modular segments with distinct functional zones: a central optical fiber element for telemetry, surrounded by intermediate filler material, and outer power conductors for power transmission. This segmentation allows each component to be optimized independently while maintaining overall mechanical stability through the structured arrangement.
2Power
If a quad configuration with four large high power conductors is used to achieve high-power capabilities, then power transmission is improved, but mechanical instability occurs and smaller optical conductors are susceptible to damage
Solution Approach 1:
The optical fiber element is nested within a protective tube structure that is surrounded by filler material, which is in turn surrounded by power conductors. This nested arrangement protects the fragile optical conductors from mechanical damage while allowing the outer power conductors to provide structural stability and high power transmission capability.
Solution Approach 2:
A tube structure and filler material are introduced as intermediary elements between the optical fiber and power conductors. The tube provides direct mechanical protection to the optical fiber, while the filler material distributes mechanical stresses and prevents the optical fiber from being compressed or damaged by the power conductors during cable assembly and operation.
3Volume of moving object
If smaller optical conductors are disposed in cavities between larger power conductors, then cable compactness is improved, but the optical conductors are pushed further into cavities and become susceptible to damage and short circuit
Solution Approach 1:
The optical fiber is nested within a dedicated protective tube that maintains a fixed, controlled spacing between the optical fiber and surrounding power conductors. This prevents the optical fiber from being pushed into cavities or making contact with power conductors, eliminating the risk of short circuits while maintaining cable compactness through the efficient use of radial space.
4Strength
If filler material is used to bind conductors together in a quad configuration, then mechanical binding is improved, but the smaller conductors remain susceptible to being pushed into cavities and damaged
Solution Approach 1:
The optical fiber is nested within a rigid protective tube that provides primary mechanical protection, while the filler material serves as a secondary binding agent that secures the tube and power conductors together. This layered protection ensures that the filler material cannot push the optical fiber into cavities, as the tube acts as a rigid barrier between the filler and the optical conductor.
Data Source
AI summary
A modular cable unit for oilfield wireline includes multiple cable modules. The cable modules are interchangeable to achieve a modular cable unit with desired telemetry and electrical properties to suit a specific application. The cable modules can be an optical fiber module, a power cable or an opto-electrical module assembly. The cable modules that make up the modular cable unit are preferably arranged in a triad configuration defining a substantially triangular tangent periphery and are surrounded by a polymeric casing having a circular periphery. The triad configuration of the modular cable unit contributes to an improved mechanical strength. A floating-tube type optical fiber element with improved mechanical strength is also disclosed.