Non-metallic elastic sealing ring, soft sealing oil 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

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DAQING OILFIELD CO LTD
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

This disclosure relates to a non-metallic elastic sealing ring, a soft-seal oil pump, and a sealing method. The non-metallic elastic sealing ring includes a non-closed ring body; the upper surface of the non-closed ring body is provided with a wedge-shaped groove structure; the non-metallic elastic sealing ring is disposed on the plunger of the soft-seal oil pump. During the upstroke, the pressure of the liquid on the upper part of the non-metallic elastic sealing ring acts on the wedge-shaped groove, decomposes into a circumferential force, causing the sealing ring to expand and deform, completely fitting with the pump barrel, strengthening the seal between the plunger and the pump barrel, maintaining pump efficiency, and simultaneously playing a role in scraping sand and scale, preventing pump jamming; during the downstroke, after the pressure on the upper and lower surfaces of the plunger is balanced, the sealing ring contracts back to its initial state, the gap between the plunger and the pump barrel increases, reducing the downward resistance caused by the high viscosity of the liquid during the downstroke, slowing down the bending of the sucker rod, extending the service life of the rod tube, extending the pump inspection cycle, and reducing production costs.
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