Pumping unit wellhead polished rod sealing device

Abstract

The invention provides a pumping unit wellhead polished rod sealing device. The sealing device comprises an upper packing box and a lower packing box which penetrate through and sleeve a polished rodand are in threaded connection. The space between the upper packing box and the polished rod and the space between the lower packing box and the polished rod are filled with an upper packing and a lower packing respectively. A gland elastically abuts against the top of the upper packing. The upper portion of a connector is sleeved with the space between the lower packing box and the polished rod in a penetrating manner and is in abut joint with the lower end of the lower packing. The inner side of the upper end of a fixing cap is in threaded connection with the outer side of the lower end of the lower packing box. The lower end of the fixing cap is fixedly connected with the lower portion of the connector. The problems that eccentric wear of the pumping unit wellhead polished rod is caused, the service life of the polished rod is short, and evacuation needs to be performed when the upper packing is replaced can be solved at the same time.

Description

technical field [0001] The invention relates to a wellhead polished rod sealing device of a pumping unit. Background technique [0002] There are several problems in the current pumping unit wellhead polished rod sealer: [0003] One is that the wellhead eccentric wear seal is not strict: when the oil well is operated, the level is adjusted, etc., the wellhead may be misaligned and eccentric wear may occur; [0004] The second is that the aging and sealing of the polished rod is not strict: because the liquid contacted by each section of the polished rod in the up and down strokes is different, in the long-term operation, due to the different degrees of corrosion and wear, the thickness of the polished rod is inconsistent. When the diameter difference of the polished rod is too large, the existing sealer In the thin position of the polished rod, it cannot be sealed, and a new polished rod needs to be replaced; [0005] The third is to release the pressure when replacing th...

AI Technical Summary

Problems solved by technology

[0003] One is that the wellhead eccentric wear seal is not strict: when the oil well is operated, the level is adjusted, etc., the wellhead may be misaligned and eccentric wear may occur;

[0004] The second is that the aging and sealing of the polished rod is not strict: because the liquid contacted by each section of the polished rod in the up and down strokes is different, in the long-term operation, due to the different degrees of corrosion and wear, the thickness of the polished rod is inconsistent. When the diameter difference of the polished rod is too large, the existing sealer In the thin position of the polished rod, it cannot be sealed, and a new polished rod needs to be replaced;

[0005] The third is to release the pressure when replacing the packing

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