A sealing system for submersible linear motor

Abstract

A sealing system of a submersible linear motor is arranged around an upper pull rod and a lower pull rod at the two ends of the submersible linear motor, and the upper pull rod and the lower pull rod are located in a dynamically-sealed lubricating oil environment. The sealing system comprises an upper corrugated pipe and a lower corrugated pipe. An upper liquid storage bag communicated with the upper corrugated pipe is arranged at the upper end of the upper corrugated pipe. A lower liquid storage bag communicated with the lower corrugated pipe is arranged at the upper end of the lower corrugated pipe. The upper corrugated pipe and the lower corrugated pipe are each formed by vertically splicing a plurality of corrugated pipe segments, the any adjacent corrugated pipe segments are connected through connection flange discs, and each corrugated pipe segment is further provided with a limiting pin. The upper liquid storage bag and the lower liquid storage bag play a compensation role, and extrusion force of crude oil in an oil well to the upper corrugated pipe and the lower corrugated pipe is compensated; the limiting pins are used for limiting the expanding and retracting travel of the corrugated pipe segments and the vertical walking distance of the corresponding corrugated pipe segments in an upper pump barrel or a lower pump barrel.

Description

technical field [0001] The invention relates to a sealing system of an oil submersible linear motor, which is a device system for realizing dynamic sealing of an oil submersible linear motor, and belongs to the technical field of downhole oil production equipment. Background technique [0002] The traditional oil pumping equipment is mainly beam pumping unit-oil pumping device. The whole set of equipment is divided into surface and underground. Due to the complex and changeable oil well mining conditions, with the continuous increase of well depth and production, this kind of pumping unit is heavy and heavy. The shortcomings of many accidents and low displacement have become very obvious. The disadvantages of traditional oil production equipment are (1) eccentric wear: it is difficult for the sucker rod to always keep parallel to the axis of the tubing during the up and down reciprocating motion, especially for inclined wells, which often break due to eccentric wear, and eve...

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Problems solved by technology

However, in this patent, the inventor did not consider the actual working environment of the electric submersible reciprocating pump. The submersible linear motor pump set needs to work in an oil well with a depth of one thousand meters or even five kilometers. The height of the liquid level is uncertain, and the height of the dynamic liquid level of the same well is constantly changing from pumping to normal oil pumping, so the pressure of the well fluid on the entire submersible linear motor will also vary with the dynamic liquid level. The height is different or changes constantly, and the sealing system made of bellows will deform with the change of pressure because it cannot be compensated, and cannot maintain the best running state; while the rubber bellows is in its If the shape is not guaranteed, the continuous compression and elongation will quickly fail, resulting in the failure of the entire sealing system

On the other hand, during the movement of the mover, the lubricating oil in the upper bellows and the lower bellows needs to be exchanged continuously through the air gap formed between the inner cavity of the stator and the mover. Because the lubricating oil has a certain viscosity, it will periodically The pressure changes in the upper bellows and the lower bellows permanently, the pressure will cause non-free deformation of the bellows, resulting in a sharp drop in the life of the bellows or even the failure to achieve normal expansion and contraction

Therefore, this patent cannot really be applied to the production of oil well operations.

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