High-temperature-resistant soft double-shield instrument cable for maritime oil and gas engineering and manufacturing method thereof

Abstract

The invention relates to a high-temperature-resistant soft double-shield instrument cable for maritime oil and gas engineering and a manufacturing method thereof. The cable is characterized in that a chemical cross-linked polyolefin insulation layer is extruded at the periphery of a tin-plated annealed stranded copper conductor to form a power cable insulation wire core; every two insulation wire cores are stranded, and then wrapped with a wire core copper foil polyester composite tape shielding layer and a wire core polyester tape, and then the insulation wire cores are stranded to form a cable core; and the periphery of the cable core is successively provided with an extruded cable core copper foil polyester tape and cable core polyester tape, an extruded inner sheath, a clad copper alloy wire weaving armor layer, a wrapped water-proof wrapping tape, and an extruded outer sheath. The insulation layer comprises the following raw material components: 12 parts of ethylene / vinyl acetate copolymer, 6 parts of high density polyethylene, 2 parts of ethylene-methacrylic acid copolymer, 0.5-1 part of cross-linking agent DCP (Dicumyl Peroxide), 0.4-0.9 part of antioxidant 1076, 0.2-0.4 part of antioxidant DNP, 0.2-1 part of lubricant stearic acid, 25-30 parts of aluminum hydroxide, 0.6-1 part of red phosphorus; and 0.05-0.1 part of ultraviolet ray absorber UV-326. The insulation layer of the cable is excellent in high-temperature resistance and ageing resistance, and long in service life.

Description

technical field [0001] The invention relates to an instrument cable, in particular to a high-temperature-resistant soft double-shielded instrument cable for offshore oil and gas engineering. The invention also relates to a method for manufacturing a high-temperature-resistant soft double-shielded instrument cable for offshore oil and gas engineering. Background technique [0002] With the exploitation of offshore oil and gas energy, there are more and more cables used in oil and gas engineering, and the performance requirements are getting higher and higher, especially the insulation and metal armor, which are the main components of the cable weight, need to be reduced to the greatest extent. The mechanical protection, the cables are suitable for the multi-moisture erosion and penetration of the oil and gas engineering environment, and the cables can operate safely for about 25 years. In the prior art, in order to reduce the weight of cables, almost all cables without inner...

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Problems solved by technology

The patent uses cross-linked polyethylene insulation, although the structure is simple and the cost is low, but it cannot meet the requirements of high temperature resistance, large current carrying capacity and multi-moisture erosion of offshore oil and gas engineering cables

[0004] The Chinese invention patent with the publication number CN101565527A discloses a 125°C irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin sheathing material for oil platforms. Can be used for cable sheathing, poor insulation performance, not suitable as insulating material

[0005] The Chinese invention patent with the publication number CN102617923A discloses a radiation-crosslinked low-smoke, halogen-free and highly flame-retardant polyolefin insulating material, whose heat aging resistance is only 135°C. The temperature is 90°C, which cannot meet the high-temperature operating environment requirements of offshore oil and gas engineering cables

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