Protector of underground oil extraction machine

Abstract

The invention relates to a protector of an underground oil extraction machine, which comprises an outer pipe, a connecting rod and adapters arranged at both ends of the outer pipe, wherein a decontamination unit, a filter unit and a sealing unit are arranged between the outer pipe and the connecting rod; the filter unit comprises a framework, a filter layer of a flexible structure is arranged in the framework, the inner diameter of the filter layer is slightly smaller than the pore diameter of both ends of the framework and is in interference fit with a connecting shaft, and one end of the filter layer is also provided with a flexibility compensation mechanism. By arranging the decontamination unit, the filter unit and the sealing unit between the outer pipe and the connecting rod, the invention realizes the scraping of dust on the connecting shaft and ensures the favorable fit between the shaft and holes after abrasion; by using the filter layer of a flexible structure, the invention effectively filter off silts or other metal particles in crude oil; and by using the dynamic / static seal structure design, the invention further avoids the inflow of the silts and other harmful substances in the crude oil and ensures the working quality and efficiency of the equipment.

Description

technical field [0001] The invention relates to equipment for oil extraction, in particular to a protection device for an underground oil extraction machine. Background technique [0002] Due to the large number of inclined wells in the oil field, the traditional head nibbling machine has a large energy loss, the tie rod is easy to break and be worn off, and the friction between the oil pipe and the tie rod causes the oil pipe to rupture and leak oil. Therefore, domestic manufacturers are vigorously studying the oil sucker. For linear motors for underground oil production, crude petroleum oil contains a large amount of sediment and magnetic conductors, and the oil contains weak acid and weak alkali. If there is no protection device, the following adverse situations will occur: [0003] 1. There is no lubricating oil on the surfaces that move with each other, the friction coefficient is high, the friction force is large, and the wear is fast [0004] 2. The sand will flow in...

AI Technical Summary

Problems solved by technology

[0002] Due to the large number of inclined wells in the oil field, the traditional head nibbling machine has a large energy loss, the tie rod is easy to break and be worn off, and the friction between the oil pipe and the tie rod causes the oil pipe to rupture and leak oil. Therefore, domestic manufacturers are vigorously studying the oil sucker. For linear motors for underground oil production, crude petroleum oil contains a large amount of sediment and magnetic conductors, and the oil contains weak acids and weak bases. If there is no protection device, the following adverse situations will occur:

[0003] 1. There is no lubricating oil on the surfaces that move with each other, the friction coefficient is high, the friction force is large, and the wear is fast

[0004] 2. The sand will flow into the motor's mover and stator, resulting in rough surface and accelerated wear

[0005] 3. The magnetic material is easy to be adsorbed on the mover containing the magnet to cause sand jams, which will eventually lead to the lifting of the well due to the failure of the motor to work normally, wasting a lot of manpower, material resources and financial resources

[0006] 4. The oil containing weak acid and weak base will damage the motor; if the coating of parts is corroded and the magnet is rusted, the magnetic performance will be reduced and the power of the motor will be reduced.

[0007] 5. The connecting rod and the static part of the oil pump and the motor are prone to fouling and wax formation, causing blockage

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