Electric cable special for oilfield and manufacturing method thereof

Abstract

The invention discloses an oil field special cable which comprises a conductor, an insulating layer and an outer protection sleeve; the outside of the conductor is coated by the insulating layer which resists high temperature, coldness, environment stress cracking and weathering aging. The outer protection sleeve is an outer sleeve which resists photooxidation aging, resists cracking and has highmechanical intensity. The manufacture method of the oil field special cable comprises: wire drawing, wire twisting, mixed processing and extruding on insulating materials, cross bonding, cable forming, metal shielding, extruding on the outer production sleeve, inspection on finished products, packaging and warehousing. The insulating layer outside the conductor in the structure of the oil field special cable has the advantages of resisting high temperature, coldness, environment stress cracking and weathering aging as well as resisting photooxidation aging, alkali, oil, flame, thermal aging and cracking; moreover, the oil field special cable has high mechanical intensity and can greatly improve the safety and reliability of the cable and prolong the service life of the cable.

Description

technical field [0001] The invention relates to a power cable, in particular to a low-voltage power cable suitable for oil fields. Background technique [0002] At present, the insulation of power cables used for "kowtow machines" (pumping units) is generally cracked, which not only affects the performance of the cables, but also directly relates to personal safety and the safety of oil wells." Due to the harsh environment of the oil field and the large temperature difference in the climate, the The mechanical performance of the XLPE insulated steel tape armored cable used decreases, and leads to cable insulation cracking, which not only increases the workload and maintenance cost of maintenance, but also brings hidden dangers to the safety of oil well operation. The earliest pumping unit (kowtow Machine) power cables use 0.6 / 1kV VV22 copper core PVC insulated steel tape armored PVC sheathed power cables. Since the oil field is located in a desert or Gobi Desert, the geograp...

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Problems solved by technology

[0002] At present, the insulation of power cables used for "kowtow machines" (pumping units) is generally cracked, which not only affects the performance of the cables, but also directly affects personal safety and the safety of oil wells."

Due to the harsh environment of the oil field and the large temperature difference in the climate, the mechanical performance of the cross-linked polyethylene insulated steel tape armored cable used in the oil field is reduced, and the cable insulation is cracked. Security brings hidden dangers

The earliest power cable for pumping unit (kowtow machine) was 0.6 / 1kV VV22 copper core PVC insulated steel tape armored PVC sheathed power cable. Because the oil field is located in the desert or Gobi Desert, the geographical environment is very harsh, and the surface in summer The temperature is high at +50°C, and sunlight strongly accelerates the aging of insulation. In winter, it is around -30°C, and it is often exposed to alkali corrosion, while PVC insulation has poor low temperature resistance. Plasticization in PVC at high temperatures The solvent is volatile, which makes the insulation brittle, and the corrosion of oil and alkali causes insulation cracking, which directly affects the performance of the cable and makes the insulation cracking common in the cable. Later, it was replaced with 0.6 / 1kV YJV22 copper core cross-linked The situation of polyethylene insulated steel tape armored PVC sheathed power cables has improved, but the problem of insulation cracking still exists

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