Upper and lower protector of high-temperature submersible motor

Abstract

The invention discloses an upper and lower protector for a high-temperature submersible motor, and the protector comprises a motor top end, a motor bottom end, a lower protector and an upper protector, wherein the lower protector is arranged at the motor bottom end, and the upper protector is arranged at the motor top end; the lower protector comprises a lower protector connecting body, a tail cone, a lower protector shell, a lower corrugated pipe and a lower breathing hole. Due to the fact that the upper protector and the lower protector are adopted, the lower protector is located at the lower end of the high-temperature motor and only bears isolation well liquid, provides motor lubricating oil expansion volume, balances pressure between the interior of the motor and a wellbore, eliminates pressure imbalance around a shaft seal and compensates lubricating oil lost in the working process of the motor; the lower protector does not bear the effects of transmitting torque and bearing axial force, so parts such as a protector shaft and a shaft protecting pipe are not arranged in the lower protector, the corrugated pipe can be made into a single-layer structure, the volume of an inner cavity of the corrugated pipe is increased, and the corrugated pipe structure is simplified.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an upper and lower protector for a high temperature submersible motor. Background technique [0002] The high-temperature motor is one of the key components of the high-temperature submersible electric pump. Because it works underground, it is necessary to prevent well fluid from entering the high-temperature motor. The function of the high temperature motor protector is mainly to balance the pressure inside and outside the motor cavity and prevent the well fluid from entering the motor. The high-temperature motor protector realizes the pressure balance inside and outside the motor cavity through the breathing hole and the metal bag. In actual engineering, due to the presence of sand in the well fluid and large solid oil lumps, the breathing hole is often blocked and the protector loses Balance the pressure inside and outside the motor cavity. At the same time, in order to ensur...

AI Technical Summary

Problems solved by technology

The high-temperature motor protector realizes the pressure balance inside and outside the motor cavity through the breathing hole and the metal bag. In actual engineering, due to the presence of sand in the well fluid and large solid oil lumps, the breathing hole is often blocked and the protector loses Balance the pressure inside and outside the motor cavity

At the same time, in order to ensure that the breathing volume of the high-temperature motor protector is greater than the expansion of the motor lubricating oil volume as the temperature rises, and to store enough motor lubricating oil to compensate for the loss in the motor's working process, the length of the protector is relatively large, increasing the The length of the submersible electric pump unit

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