Wax-removing and preventing oil pipe unit, wax-removing and preventing oil pipe and preparation method of wax-removing and preventing oil pipe unit

Abstract

The invention relates to a wax-removing and preventing oil pipe unit, a wax-removing and preventing oil pipe and a preparation method of a wax-removing and preventing oil pipe unit. The oil pipe unit includes an oil pipe body and an inner pipe located in the oil pipe body, and the gap between the oil pipe body and the inner pipe is filled with thermal insulation material. The conductive pipe section of the oil pipe is formed by connecting several above-mentioned oil pipe units sequentially through couplings, and an insulating metal gasket is provided inside the coupling, and the insulating metal gasket is composed of a conductive inner ring and an insulating outer ring integrated into one body. The insulating metal gasket realizes the electrical connection between the oil pipe bodies and the electrical connection between the inner pipes. The preparation method is to assemble the inner pipe, the first sealing flange and the oil pipe body into one body, inject molten insulation and heat preservation material into the gap between the inner pipe and the oil pipe body, and then embed the second sealing flange after solidification. This oil pipe can electrically heat the crude oil in the oil pipe, and is suitable for pumping heavy oil.

Description

technical field [0001] The invention relates to a wax-removing and preventing oil pipe unit (unit pipe), a wax-removing and preventing oil pipe composed of the oil pipe unit and a preparation method of the oil pipe unit, belonging to the field of petroleum exploitation equipment. Background technique [0002] With the massive exploitation of international oil, the oil reserves are getting less and less. In order to cope with the shortage of oil reserves, the major oil fields have carried out secondary oil recovery or even tertiary oil recovery to varying degrees. Three-high (high pouring, high viscosity, high waxy) crude oil, especially ultra-high heavy oil, which was not valued by oil people before, is also doing everything possible to carry out large-scale exploitation. Traditional heavy oil production techniques mainly include steam huff and puff, hot oil blending, chemical viscosity reduction, electric heating, etc., all of which consume energy (electric energy, natural ...

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Problems solved by technology

The traditional thermal insulation oil pipe is a prestressed vacuum insulation oil pipe, which is complicated in process, bulky and expensive, and the inner diameter of the 89 heat insulation oil pipe is only 40mm, and the diameter of the smallest Φ19 sucker rod coupling is 41.3mm, which is affected by the sucker rod. Limitations, the traditional thermal insulation tubing cannot be used in heavy oil production operations and wax removal, it can only be used for steam injection in oil wells

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