Submersible screw pump based on ultra-low speed multi-rotor permanent magnet submersible motor

Abstract

The invention provides a submersible screw pump based on an ultra-low-speed multi-rotor permanent magnet submersible motor, and relates to the technical field of oil well mechanical oil extraction equipment. The submersible screw pump includes a permanent magnet submersible motor, a protector joint and a conversion joint. One end of the spline shaft is provided with a main shaft, the outside of the spline shaft is fixedly connected with a boss, and the inside of the joint An installation groove is provided, and balls are arranged in the middle side wall and the upper and lower side walls of the installation groove, and the outer side of the ball is connected to the outer side of the boss. The permanent magnet submersible motor includes a motor joint assembly, a motor rotor, a central Bearings and motor stators, permanent magnets have a total of 22 poles, with fan-shaped opening slots, the downhole sensor is connected to a frequency converter, and one end of the thrust plate is provided with a thrust bearing to reduce the load on the central bearing. The system does not need to use a reducer, which improves the reliability of the system Higher starting torque, lower system current and unit heat generation.

Description

technical field [0001] The invention relates to the technical field of oil well mechanical oil production equipment, in particular to a submersible screw pump based on an ultra-low-speed multi-rotor permanent magnet submersible motor. Background technique [0002] The oil production equipment currently used at home and abroad mainly includes two categories: rod and rodless oil production equipment. Rod oil production equipment generally has the following problems: (1) Energy utilization efficiency is low. The average efficiency of the rod pumping system is less than 20%. It is the largest production power consumption system in the oilfield. Its annual power consumption accounts for about 56% of the total electricity consumption of the oilfield, and about one-third of the production cost of the oilfield is electricity consumption. About 30% of electric energy consumption, there is a huge waste of energy; (2) The oil recovery rate is low. For high water cut wells and heavy oil...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a submersible screw pump based on an ultra-low-speed multi-rotor permanent magnet submersible motor, which solves the problem that the current existing reducer cannot work reliably for a long time in the pump body, resulting in direct drive submersible screw pumps. The problem of poor practicability of pump rodless oil production equipment

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