Universal random deviation rectification outside injected magnetic fluid polished rod sealing device

Abstract

Provided is a universal random deviation rectification outside injected magnetic fluid polished rod sealing device applied for oil extraction in the oil field. The universal random deviation rectification outside injected magnetic fluid polished rod sealing device comprises a polished rod sealing culvert at the upper portion, wherein an upper and a lower group of permanent magnets are arranged in the culvert, an injection hole is formed in the middle portion capable of Is capable of injecting and supplying magnetic fluid into a cavity in due time to conduct a dynamic sealing to the polished rod, and a universal-joint mechanism at the lower portion is capable of rectifying deviation randomly in radial and axial three-dimensional space. A polished rod sealing culvert assembly is arranged above the random deviation rectification mechanism. The universal random deviation rectification outside injected magnetic fluid polished rod sealing device thoroughly resolves problems that production halts often occur due to applying packing polished rod sealing device in the existing oil extraction with huge energy consumption and easy damage, causing emitting, dipping and leakage of well mouth pressed oil, gas and water and accompanying serious environmental pollution, potential safety hazard and other world class problems, and can be widely applied in well mouth polished rod sealing of oil field sucker-rod pump oil extractor.

Description

technical field [0001] (1), technical field of the present invention: [0002] Technical field of patent description: mechanical device and transportation technical field - mechanical components - G05G - control device or system distinguished only by mechanical features. [0003] Catalog of high-tech fields of the Ministry of Science and Technology: 8. High-tech transformation of traditional industries—(4) New machinery—2. General machinery and new machinery. [0004] (two), the scope of application: [0005] The invention is a new technology of energy saving, emission reduction, safety and environmental protection in the petroleum industry, an upgraded product of the old polished rod sealer, and is suitable for the polished rod sealing of about 500,000 wells with rod pumps in more than 20 large and medium-sized oil fields across the country. [0006] (three), function: [0007] The present invention adopts the most advanced magnetic fluid sealing technology to realize "zer...

AI Technical Summary

Problems solved by technology

When the packing wears to a certain extent, crude oil and high salinity formation water will leak to the ground, causing serious pollution of the surface environment; if the oil well is in the farmland, it will cause the death of crops

[0025] (2), the labor intensity of the workers is high

[0027](3), potential safety hazard

Therefore, packing leakage is a serious safety hazard in oil fields

[0029](4), increase energy consumption

[0030]During the oil extraction process of the pumping unit, whether it is an upstroke or a downstroke, the polished rod is always in the brake state of being tightly held by the packing, which increases the movement resistance, thus It also increases the energy consumption of the pumping unit

[0031](5), waste of resources

[0032] After the rubber block packing (or braided packing sealing ring) is worn out, there is a gap between it and the polished rod. As the service time prolongs, the gap continues to expand. The pressurized oil, gas, and water in the oil well continue to emerge and overflow from the gap, wasting precious resources

[0033](6), damaged polished rod

[0034]Because the polished rod is always in a state of mechanical compression and friction, the friction loss makes the polished rod change from thick to thin, and the fatigue stress causes cracks inside the polished rod. The double effect greatly shortens the polished rod. service life

[0035](7), easy to cause partial friction of the sucker rod

[0041]After laboratory tests and oilfield well field tests, it has been confirmed that the magnetic fluid sealing device designed by me is advanced and reliable; two requirements are put forward Problems to be improved: First, there will be a small loss of magnetic fluid during the reciprocating motion of the polished rod, and it needs to be replenished once every 1 to 2 years; second, the drift of the polished rod is normal during the oil pumping process, and a deflection correction device is necessary to ensure the smooth rod and seal The shell will not be scratched and damaged

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