Flexible continuous carbon fiber self-heating element and structure thereof

Abstract

The invention relates to a flexible carbon fiber self-heating element which is of a multilayered structure and is further filled with a heat-resisting insulation material. The flexible carbon fiber self-heating element comprises a carbon fiber woven composite material outer layer, a heat-resisting insulation layer and a plurality of side-by-side carbon fiber flexible heating cables from outside to inside. The multiple carbon fiber flexible heating cables are also of a multilayered structure consisting of surface heat-resisting insulation layers and inner continuous carbon fiber heating wires. The flexible continuous carbon fiber self-heating element prepared through the structure has a stable heating temperature, the length can be cut flexibly as required, the flexible carbon fiber self-heating element can be widely applied to viscosity reduction of thickened oil or heat preservation of oil conveying pipelines in the oil production field, and the power-on heating temperature can reach 100-150 DEG C. The steps are simple, operation is convenient and practicability is high.

Description

technical field [0001] The invention belongs to the field of viscosity reduction of heavy oil or heat preservation of oil pipelines in the field of petroleum exploitation, and in particular relates to a flexible continuous carbon fiber self-heating element and its structure. Background technique [0002] With the continuous development of the field of oil extraction and transportation, the efficiency of oil production and transportation and the efficient exploitation and utilization of complex oil wells have become the focus of continuous research by technicians. With the increasing demand for oil production, various types of oil wells are facing There are also various construction problems, especially the downhole environment of Gaoji Oilfield is very difficult. Due to the original high freezing point and high wax content of this kind of oilfield, the phenomenon of downhole wax deposition is serious, which brings great difficulties to the exploitation and transportation of t...

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Problems solved by technology

[0003] At present, the common practice in China to solve the problem of heavy oil viscosity reduction and crude oil transportation in the oil production process is to use a new type of composite material sucker rod. This kind of sucker rod is embedded with elements that can be electrically heated during the preparation process. Fibers, such as carbon fibers and metal fibers, are introduced together with the reinforcing fabric during the preparation of composite continuous sucker rods. Although this solution can make the sucker rod have heating characteristics, the continuous length of conductive fibers is not stable when combined with the reinforcement. In the process, there is an instability problem in the heating and electrification process, which causes the heating temperature of the rod body to be uneven

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