High-temperature-resistant motor applicable to high-temperature electric submersible pump

Abstract

The invention discloses a high-temperature-resistant motor applicable to a high-temperature electric submersible pump. A motor shaft is of a hollow structure; one end of the motor shaft stretches to a top housing, and the end part thereof is sealed; the other end of the motor shaft stretches to a tail housing, and an oil inlet is formed in the end part thereof; a supercharging spiral blade and a filter are sequentially arranged at the oil inlet; stabilizing bearings are arranged between adjacent unit rotors; stabilizing bushings and the stabilizing bearings form friction pairs; a thrust bearing is mounted between the top housing and the motor shaft; a static annular plate and a movable annular plate of the thrust bearing form a friction pair; the movable annular plate is fixedly connected with the motor shaft through a flat key; all the friction pairs are lubricated through oil throwing holes in the motor shaft; an oil storage space is formed in the upper part of the movable annular plate of the thrust bearing; the motor shaft is isolated from lubricating oil in the oil storage space through a main shaft spacer bush; a radial supporting bushing is mounted between the tail housing and the motor shaft, and the motor shaft on the upper part of the radial supporting bushing is sleeved with a main shaft protecting tube; an oil returning passage is formed in the housing body of the tail housing; a shading plate is arranged above the oil returning passage, and an annular sedimentation tank is arranged on the tail housing on the outer side of the oil returning passage.

Description

technical field [0001] The invention belongs to the technical field of high-temperature submersible electric pumps, in particular to a high-temperature-resistant motor suitable for high-temperature submersible electric pumps. Background technique [0002] SAGD (Steam Assisted Gravity Drainage) technology is a cutting-edge heavy oil thermal recovery development technology. Its process principle is as follows: first, steam is continuously injected into the reservoir through the gas injection well at a higher position, and then the upper oil layer is heated by steam overlay , and gradually form a steam cavity, so that the fluidity of crude oil is enhanced, and the crude oil flows to the lower horizontal production well under the action of gravity, and finally the crude oil is extracted from the ground. [0003] At present, for the oil wells that have successfully applied SAGD technology, most of them are medium and low temperature oil wells. Foreign models of high-temperature ...

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Problems solved by technology

However, as the exploitation of medium and low temperature oil wells tends to be saturated, it can only turn to high temperature oil wells with deeper burial and higher temperature, and the downhole ambient temperature of high temperature oil wells can reach about 220°C. Meet the needs of high temperature oil well exploitation

[0004] For high-temperature submersible electric pumps, it is divided into an above-ground part and an underground part. The above-ground part is mainly the working power supply, which includes transformers, frequency converters, power distribution cabinets and junction boxes, etc. The underground part includes motors, protectors, and oil-gas separators. devices, multi-stage centrifugal pumps and cables, etc., and the underground part of the high-temperature submersible pump must be able to withstand the high-temperature environment underground, especially the high-temperature performance of the motor will directly affect the reliability of the high-temperature submersible pump. When exploiting high-temperature oil wells, the motors of existing high-temperature submersible electric pumps are limited by insufficient high-temperature resistance, which has seriously affected the reliability of high-temperature submersible electric pumps in the process of high-temperature oil well exploitation.

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