Drilling Rig Power Cable with Aramid Braid Reinforcement
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Solution Overview
Problem
Top-drive power cables used in drilling rigs face challenges such as mechanical and chemical damage, reduced flexibility due to harsh conditions, and difficulties in easy dismantling and positioning without protective rubber hoses, leading to potential failure and increased operational complexity.
Innovation Solution
A top-drive power cable design featuring a central conductor with electromagnetic shielding, a polymeric sheath, and a densely packed aramid fibre braid reinforcing layer for mechanical protection, along with a mud-resistant outer sheath and a stripping tube for easy handling, allowing for flexible operation and reduced stress on the cable during clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable is positioned within a rubber hose for protection, then mechanical and chemical damage is prevented, but the cable weight increases and positioning becomes time-consuming
Solution Approach 1:
The invention extracts the cable from the protective rubber hose and integrates the protection function directly into the cable structure through the polymeric sheath and reinforcing layer, eliminating the separate hose and reducing overall weight
Solution Approach 2:
The protective functions previously provided by the separate rubber hose are merged into the cable itself through the polymeric sheath and reinforcing layer, creating an integrated protective structure
2Stability of the object's composition
If the cable is glued to the rubber hose to prevent movement, then cable stability is improved, but the positioning process becomes time-consuming
Solution Approach 1:
The stabilizing function is merged into the cable structure through the polymeric sheath that fully encloses the electromagnetic shielding layer, eliminating the need for separate gluing processes
Solution Approach 2:
The polymeric sheath provides inherent stabilization and protection without requiring external gluing or positioning operations, making the cable self-sufficient
3Reliability
If a cable clamp is used to prevent damage during uncontrolled motion, then cable protection is improved, but the clamp exerts pressure that can damage the cable sheath and conductors during routine flexing
Solution Approach 1:
The densely packed aramid fibre braid acts as a cushioning layer between the cable clamp and the cable components, absorbing and distributing clamping pressure to prevent damage to the polymeric sheath and conductors during both routine operation and uncontrolled motion
4Adaptability or versatility
If the cable is designed for continuous flexing operations, then operational flexibility is improved, but the cable may fail under repetitive stress without adequate reinforcement
Solution Approach 1:
The cable combines multiple materials with complementary properties: copper conductors for electrical conductivity, polymeric sheath for flexibility and chemical resistance, and aramid fibres for high tensile strength and fatigue resistance, creating a composite structure that withstands continuous flexing
Data Source
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AI summary
The invention relates to a cable suitable for supplying power to a top-drive assembly on a drilling rig. In a typical embodiment, the power cable includes a central conductor (1), a central conductor insulation layer (2), electromagnetic shielding (5) enclosing the central conductor, a first polymeric sheath (6), a reinforcing layer (3) and a second polymeric sheath (4) enclosing said reinforcing layer. According to the invention, the reinforcing layer is made of a densely packed braid covering between 95% and 100% of the surface of the first polymeric sheath.