Method for improving corrosion resistance of motor head of electric submersible pump

Abstract

The invention relates to the technical field of performance research of pumps, and discloses a method for improving the corrosion resistance of a motor head of an electric submersible pump. The methodcomprises the following steps of spraying a prepared corrosion-resistant ceramic composite material onto the surface of the motor head by adopting a plasma spraying technology to obtain a coating with the thickness of 60-66 microns, compared with the prepared corrosion-resistant ceramic composite material with an existing coating material, the surface of the motor head has better bonding strengthand high-temperature and high-pressure resistance stability, the surface of the coating obtained by further controlling spraying conditions is smoother and more compact, almost no gap or crack exists, the formed coating is high in bonding strength with the surface of the motor head, high in thermal shock resistance and remarkably improved in corrosion resistance and wear resistance, has a long-term surface protection effect on the motor head of the electric submersible pump, and can adapt to a high-temperature and high-pressure working environment of a high-concentration corrosive medium.

Description

technical field [0001] The invention belongs to the technical field of pump performance research, and in particular relates to a method for improving the corrosion resistance of a submersible electric pump motor head. Background technique [0002] The electric submersible pump is a multi-stage centrifugal pump working underground. It is lowered into the well together with the oil pipe. The surface power supply transmits electric energy to the underground submersible motor through the transformer, control panel and power cable, so that the submersible motor drives the multi-stage centrifugal pump to rotate. Convert electrical energy into mechanical energy to lift the well fluid in the oil well to the surface. In the process of oil production in oil fields, the corrosion of submersible electric pumps by underground corrosive media is a common practical problem, which has a huge adverse effect on the performance and service life of pump equipment. In particular, the motor head...

AI Technical Summary

Problems solved by technology

However, the existing alloy coatings are fatal to the media that cause corrosion of the motor head, such as hydrogen sulfide, carbon dioxide, salts, etc. These media are fatal to the corrosion of submersible pumps, especially under high temperature and high pressure operating conditions. The alloy coating used in the prior art cannot solve this kind of corrosion problem. The corrosive medium has a strong permeability to the coating, which causes an insulation short circuit and shortens the service life of the submersible pump.