Carbon fiber expanding and heating cable for oil extraction

Abstract

The invention discloses a heating cable, in particular a carbon fiber expanding and heating cable for oil extraction of heavy oil and high pure-point oil. A structure of the carbon fiber expanding and heating cable for oil extraction is that: a core part consists of a sealing layer and an isolation expansion chamber arranged in the sealing layer; expansion fillers are filled in the isolation expansion chamber; and the sealing layer is embedded with a carbon fiber heating line, and outside of the sealing layer is wrapped with a layer of protection layer of the same material as that of the sealing layer. The invention has the advantages that: 1, the electro-thermal conversion efficiency of the heating cable is high, and more heat can be generated by consuming the same electric energy; 2, the heating cable expands under heating, so that the heat conduction capacity of the heating cable and a hollow sucker rod can be improved, the insulation damage caused by over temperature in the interior of the heating cable can be prevented, and the service life of the heating cable can be prolonged; and 3, the cable has a light weight, which is about half of the weight of the conventional medium-frequency heating cable, and the energy-saving effect is very remarkable.

Description

technical field [0001] The invention relates to a heating cable, in particular to a carbon fiber expansion heating cable specially used for mining heavy oil and high pour point oil. Background technique [0002] When producing heavy oil and high pour point oil, special heating cables must be used to improve the fluidity of crude oil. At present, the widely used heating cable is a medium frequency heating cable, commonly known as copper core iron armored cable. The core of the cable is copper, the outer skin is iron armor, and there is an insulating layer between the copper core and the iron armor outer skin. Put the copper core iron armor cable into the hollow sucker rod, and short-circuit the copper core and iron armor at the lower end of the cable, so that the copper core and iron armor form a conductive loop. When the heating cable is applied with an intermediate frequency voltage with a frequency of 500Hz to 1000Hz and a voltage of about 1200V, a current of the same fr...

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Problems solved by technology

[0003] Due to the limitation of heating principle and cable structure, this kind of intermediate frequency heating has the following problems: 1. It must be equipped with a high-power intermediate frequency transformer

The higher the self-weight of the heating cable, the higher the power requirement of the motor, which also increases the power consumption of the motor; 3. In order to make the installation of the intermediate frequency heating cable possible, in terms of structural size, the outer diameter of the intermediate frequency heating cable must be smaller than The inner diameter of the hollow sucker rod, that is, there is a gap between the outer surface of the heating cable and the inner surface of the hollow sucker rod, which seriously affects the heat transfer effect from the heating cable to the sucker rod, making the internal temperature of the heating cable very high, and easily causing the insulation of the heating cable Aging, reducing the insulation performance of heating cables

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