Carbon fiber cable for oil well heating

Abstract

The invention discloses a carbon fiber cable for oil well heating. The carbon fiber cable comprises an outer layer sleeve. A tensile braid layer woven of metal wires is arranged on an inner wall of the outer layer sleeve, a heat-conducting insulating layer is arranged in the tensile braid layer, three three-phase power lines shaped like a Chinese character pin are arranged in the heat-conducting insulating layer, and a carbon fiber heating cable is arranged among the three-phase power lines. Due to the fact that the carbon fiber cable has no visible light in the heating process, electric heating conversion efficiency reaches up to 98%, heating power is high, the temperature is high, the heating temperature can reach 400 DEG C, the carbon fiber cable is not oxidized when used under a high-temperature state, and a load of current of the carbon fiber cable in unit area is not changed; in addition, the heat conduction speed is in direct proportion to the surface area of a heating element, a carbon fiber core wire is formed by twisting a plurality of carbon fiber wires, the surface area of the carbon fiber core wire is far larger than that of an alloy electric heating body, so that compared with a traditional alloy electric heating body heating cable, the carbon fiber heating cable enables energy saving to be improved by over 30%, and energy saving effect is obvious.

Description

technical field [0001] The invention relates to a carbon fiber cable, in particular to a carbon fiber cable for oil well heating. [0002] Background technique [0003] Oil well heating cables are used in oil extraction, especially in the process of heavy oil extraction. Because underground crude oil contains a large amount of paraffin, as the crude oil sucker rod is lifted slowly, the temperature of crude oil close to the surface layer will drop correspondingly, paraffin condensation will occur, and the crude oil flow rate of the oil well will also decrease accordingly. In order to increase crude oil production, it is necessary to install a heating cable in the sucker rod of the oil well to increase the temperature of crude oil to achieve temperature compensation, thereby improving the flow performance of crude oil. Because most of the electric heating elements of the existing electric heating cables are made of alloy materials, the power consumption is large and the heat...

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Problems solved by technology

Because most of the electric heating elements of the existing electric heating cables are made of alloy materials, the power consumption is large and the heat conversion efficiency is low, which can only reach 70%; The temperature is about 200℃, and the heat generation is uneven, easy to burn out, easy to wear, and the service life of the cable is relatively short. Generally, it needs to be replaced once a year or so, and requires frequent maintenance. The construction of replacing the cable is complicated and consumes a lot of manpower and material resources. Increased cost of oil extraction

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