Cable for petroleum exploration and manufacturing method thereof

Abstract

The invention relates to a cable for petroleum exploration and a manufacturing method thereof; ethylene-propylene rubber insulation layers are extruded outside core wire conductors to form insulated core wires; one insulated core wire is arranged in the center, six insulated core wires are arranged on the periphery and are regularly twisted into a cable core, and yarns are filled in gaps among the insulated core wires; and a rubber cloth tape wrapped layer is arranged on the periphery of the cable core, a polyester tape wrapped layer is arranged on the periphery of the rubber cloth tape wrapped layer, a chlorosulfonated polyethylene sheath is extruded on the periphery of the polyester tape wrapped layer, and a galvanized steel wire double-layer braided armor layer is arranged on the periphery of the chlorosulfonated polyethylene sheath. The cable has a round shape, high tensile strength and excellent insulation performance and mechanical performance, the pulling strength can reach 60000N, and the operation depth reaches a 7000m deep well; the insulation resistance among the insulated wire cores of the cable as well as the insulation resistance between the insulated wire cores and armors are no less than 800Momega.km; and no breakdown occurs after a 5000V voltage withstanding test is performed for continuous 5min, and the sheath does not deform after a wear resistant test for 125 weeks is performed.

Description

technical field [0001] The invention relates to a cable, in particular to a cable for deep-sea oil exploration; the invention also relates to a method for manufacturing the cable for deep-sea oil exploration. Background technique [0002] During the manufacturing process of the cable, multiple round single wires are twisted into round strands of various cross-sections. The following three twisting methods are usually used: regular twisting, bundle twisting and double twisting. [0003] Regular stranding is a single wire in the center, 6 wires in the first layer outward from the center, and 6 wires in each layer after that, twisting in a concentric circle. The stranding direction of each layer is opposite, but the outermost layer must be It is right direction (Z direction), and the purpose is to facilitate the connection of two strands of wires. Regularly stranded conductors have the most stable structure, which is beneficial for bending, twisting and twisting. The outer dia...

AI Technical Summary

Problems solved by technology

[0006] The current deep-sea oil exploration cables have low tensile strength, poor waterproof performance, and are prone to damage when encountering hard objects, and use ordinary ethylene-propylene rubber insulation and ordinary rubber sheaths

Ordinary ethylene propylene rubber has low insulation resistance, poor mechanical properties and aging performance, which makes the service life of the cable short and prone to breakage

Ordinary rubber sheaths have poor mechanical properties and aging properties, are not resistant to oil, and have a large drop in tensile strength and elongation at break after oil immersion, and are prone to cracking

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