Nonmetal elastic sealing ring, soft sealing oil well pump and sealing method

By using the wedge-shaped groove structure and labyrinth design of the non-metallic elastic sealing ring, the problem of the sealing ring's inability to elastically deform during the plunger's up and down strokes is solved, achieving dynamic sealing and wear protection of the sealing ring, and improving the efficiency and lifespan of the oil pump.

CN122170027APending Publication Date: 2026-06-09DAQING OILFIELD CO LTD +1
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Patent Information

Application Number
CN202411782966.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The sealing ring of a conventional soft-seal oil pump cannot elastically deform during the up and down strokes of the plunger, leading to pump jamming, severe wear, and increased manufacturing and production costs.

Method used

It adopts a non-metallic elastic sealing ring, designed with a polymer material such as nylon, and has a wedge-shaped groove structure. The wedge-shaped groove enables the sealing ring to expand and deform during the upper stroke to make close contact with the pump barrel, and returns to its initial shape during the lower stroke. Combined with the labyrinth seal design, it achieves dynamic adjustment of sealing performance.

Benefits of technology

It enhances sealing performance, prevents pump jamming, extends rod and tubing life, reduces leakage, decreases operating costs, and increases oil well production.

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Abstract

The invention relates to a non-metal elastic sealing ring, a soft sealing oil well pump and a sealing method. The non-metal elastic sealing ring comprises a non-closed ring body and a sealing ring, a wedge-shaped groove structure is arranged on the upper surface of the non-closed ring body; the non-metal elastic sealing ring is arranged on a plunger of the soft sealing oil well pump, during upstroke motion, the pressure of liquid on the upper portion of the non-metal elastic sealing ring acts on the wedge-shaped groove and is decomposed into circumferential acting force, the sealing ring is expanded and deformed and completely attached to a pump cylinder, sealing between the plunger and the pump cylinder is strengthened, and the pump efficiency is kept. Meanwhile, the effects of scraping sand and dirt are achieved, and the pump is prevented from being stuck; during down-stroke motion, after the pressure of the upper surface and the lower surface of the plunger is balanced, the sealing ring is shrunk back to the initial state, the gap between the plunger and the pump cylinder is increased, the downward resistance caused by large liquid viscosity in the down-stroke motion process of the plunger is reduced, the bending degree of a sucker rod is slowed down, the service life of a rod pipe is prolonged, the pump inspection period is prolonged, and the production cost is reduced.
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