Downhole linear electric motor oil-well pump

Abstract

An oil well pump of an underground linear motion actuator is designed for solving the technical problems that as the structure of the existing linear oil well pumps are unreasonable, thus causing a mover to be deadlocked, a stator to be scrapped, a magnet to be eroded and the service life to be short, and the like, and the oil well pump of the underground linear motion actuator comprises two large parts: an oil well pump and a linear motor, wherein, the single-level armatures of the linear motion actuator are connected with each other by threads with a spigot in a spoke-work way and are located to seal with the end surface by the spigot; a phase-change connection wire is adopted between each section of the windings; the air gap of the linear motor is sealed by a small clearance; the magnetic pole of the mover is a radical magnetic circuit pole; an air expander is arranged in an outer shell of the linear motor. The linear motion actuator is connected with the oil well pump by a screen pipe; a special pump is designed on the upper end of the pump barrel, which changes a traditional oil circuit; a plunger piston and a push rod use solid cores in a pump barrel. The oil well pump of the underground linear motion actuator has the characteristics and beneficial effects of reasonable structure, saving energy and no polluting the environment, which is suitable for the use of directional wells; the parameter can be adjusted at any time according to the changes of different well liquid.

Description

Technical field: [0001] The invention relates to an oil pump, in particular to an underground linear motor oil pump. It is mainly applicable to the application fields of oil extraction in oil fields. Background technique: [0002] The currently used linear motor oil well pump has the following defects: the air gap of the linear motor has no protection measures, so that crude oil and sediment enter the air gap, which is easy to jam the mover and corrode the permanent magnet on the mover; The transformer oil expands due to temperature rise, and the armature is deformed because there is no pressure relief device, causing the mover to sweep, damage the inner sleeve, crude oil enters the winding, the insulation is damaged, and the motor cannot work; multiple single sections connected by welding The armature cannot guarantee the coaxiality and straightness of the inner diameter of the multi-section armature, resulting in sweeping of the mover; the magnetic pole of the tangential ...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an underground linear motor oil well pump in order to solve the problems of unreasonable structure of the existing linear motor oil well pump, which cause stuck movers, bore sweeping, magnet corrosion, and short service life, etc., which mainly consists of oil well pump 1 and the linear motor 2; the armature of the linear motor 2 is formed by a plurality of single-section armatures 121 in series, and a special valve is provided on the pump cylinder; every two single-section armatures 121 are connected by threads Joint connection, that is, the screw thread 122 with the stop is tightly connected with the internal thread gland 123, and is positioned and sealed by the stop face; multiple single-section armatures 121 are connected in series with multiple linear motors, and the windings of each section The two ends of the linear motor 2 are provided with an upper sealing sleeve 107 and a lower sealing sleeve 101 to seal the air gap 111, and an ST-shaped sealing ring 106 for a hole is provided close to the upper sealing sleeve 107 and is connected with the upper sealing sleeve 107. The sealing piston 114 cooperates; the movable sealing piston 102 in the lower sealing sleeve 101 is provided with a ST-shaped sealing ring 108 for the shaft; 133 excitation, and with a starting winding 132; an air expander is also provided in the shell of the linear motor 2; the special valve 214 at the upper end of the oil pump barrel 210 is connected with the pump barrel 210 through the pump barrel joint 209; The plunger 211 and the push rod 213 in the pump barrel 210 are solid cores; the pump casing 212 is provided with an oil inlet 215 on the outside of the pump barrel 210; the oil inlet 216 is arranged at the position corresponding to the ball valve 206; the oil inlet hole Both 215 and the oil inlet 216 communicate with the oil chamber in the pump housing 212

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