Pumping well mouth lubricating dual-sealing device

Abstract

The invention discloses a pumping well mouth lubricating dual-sealing device which comprises an oil-storage lubricating device sleeving an oil pumping polished rod, wherein dual-sealing design is represented so that sealing devices are arranged at both of the upper and lower ends of the oil-storage lubricating device. The oil-storage lubricating device is located in the middle, a universal joint is arranged on an oil storage chamber, a grease fitting is connected to a screw hole formed in the side surface of the oil storage chamber through screw threads, and the detached grease fitting can be connected to an emptying discharge pipeline. The pumping well mouth lubricating dual-sealing device has double functions of lubrication and oil collection, and is convenient to mount, low in cost and high in leakproofness; as a result, the service life of a packing is prolonged.

Description

technical field [0001] The invention relates to a well head device of an oil pumping well in the petroleum industry, in particular to a double sealing device for lubricating the well head of an oil pumping well. Background technique [0002] The wellhead sealing device of the pumping well in the petroleum industry is installed on the polished rod sealer of the pumping well such as the heavy oil well, the high water content oil well, and the high sand content oil well. The existing electric heating oil well double packing box sealing device, application number: 200920046945.1, application date: 2009-07-01, publication number: 201436368, publication date: 2010-04-07. Including the lower packing box, the lower packing box pressure cap, and the upper packing box pressure cap. A nylon guide base plate is set on the inner step of the lower packing box, and old belt loops are stacked on the guide base plate. An iron retaining ring is set on the upper end, and a nylon combined guid...

AI Technical Summary

Problems solved by technology

[0003] 1. The upper and lower packing boxes are in the same pressure system, and the sealing performance has no obvious hierarchical improvement;

[0004] 2. There is no lubrication system between the upper and lower packing boxes, the sealing material in the upper packing box lacks effective lubrication, and the wear between the polished rod and the sealing material is intensified;

[0005] 3. The screw connection between the upper and lower packing boxes lacks an effective steering mechanism, and the centering of the upper and lower packing boxes is difficult;

[0006] 4. The end faces of the inner pressure cap and the outer pressure cap of the upper and lower packing boxes are poorly sealed, which may easily lead to oil leakage from the threaded fasteners of the upper and lower packing boxes.

[0009] 2. The sealing of the wellhead is not high, it is difficult to maintain clean production, and the environmental protection and pollution control fee is 10 yuan / m 2 , a conservative estimate of an annual increase in expenditure of 3,650 yuan;

[0010] 3. The wear between the polished rod and the sealing material is intensified, and the frequency of updating the sealing material is increased. The well must be stopped for replacement, which may easily cause heavy oil wells or sand producing wells to lie down. The cost of a single well operation is more than 100,000 yuan

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