Self-heating casing string

Abstract

The invention provides a self-heating casing string. The self-heating casing string comprises a heating coil and at least one electric power device, a cavity is formed between the outer wall and the inner wall of the casing string, the heating coil is spirally arranged in the cavity, the electric power device is erected in the casing string in a suspended mode, the electric power device comprisesa rotating part and fixed parts, the two ends of the rotating part are connected with the fixed parts correspondingly, the fixed parts are arranged in the cavity, the fixed parts are electrically connected with the heating coil, and when liquid passes through the casing string, the rotating part is driven by the liquid to rotate and cooperates with the fixed parts to provide power supply for the heating coil. According to the self-heating casing string, through the mutual cooperation of the electric power device and the heating coil, self-heating of the casing string is realized, the supply ofexternal energy is not needed, the loss of a large amount of energy is avoided, and the oil extraction cost is reduced.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to a self-heating casing string. Background technique [0002] Heavy oil is crude oil with high asphaltene and colloid content and high viscosity. In the oil extraction of oil fields, heavy oil has special high viscosity and high freezing point characteristics, and some technical problems are encountered in various aspects of development and application. Difficulty, the formation and coalescence of wax crystals in high pouring and high waxy heavy oil are directly affected by temperature. When the temperature of heavy oil is higher than the wax precipitation temperature, on the one hand, the wax crystal particles in the oil will be partially or completely dissolved; on the other hand On the one hand, the asphalt colloid will be highly dispersed, reducing the possibility of wax solidification. [0003] At present, in the production of oilfields, wellbore heating is often used in th...

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Problems solved by technology

[0005] The invention provides a self-heating casing string, which realizes the self-heating of the casing string through the mutual cooperation of the electric device and the heating coil, and solves the problem that the electric heating setting used in the prior art needs external energy supply, resulting in huge energy consumption and oil recovery Technical issues that raise costs

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