A sealing device based on oil wellhead pumping equipment

Abstract

The invention discloses a sealing device based on an oil wellhead pumping device, which comprises a polished rod and a sealing body sheathed on the outside of the polished rod to form a seal. Root adjustment sleeve, fixed sleeve, working valve and lock nut, and the gap between the sleeves is filled with packing used to form an oil seal; among them, the packing adjustment sleeve, fixed sleeve, working valve and lock nut set on the outer wall of the polished rod Each device is flexibly connected; the packing adjustment sleeve includes an oiling device arranged on its outer wall, which is used to add lubricating oil to increase the lubricity of the outer wall of the polished rod. The technical solution has the advantages of stable structure, good sealing performance, and the ability to quickly drop lubricating oil into the sealing area. It can be widely used in the field of sealing device manufacturing.

Description

technical field [0001] The invention relates to the field of sealing device manufacture. More specifically, the present invention relates to a sealing device based on oil wellhead pumping equipment. Background technique [0002] Due to the limited oil resources, many oil wells have entered the stage of post-exploitation and high-difficulty exploitation. Frequent water injection, pickling, and wax removal operations are required to make the liquid contain high water content, salt, alkali, hydrogen sulfide and other corrosive substances, and oil. The amount keeps decreasing. At the same time, the sinking of the wellhead caused the deflection of the polished rod and the wellhead, and the lack of reasonable structure and effective lubrication of the sealing mechanism accelerated the wear and leakage of the wellhead seal, causing many wellheads to leak oil for a long time to pollute the environment and bring great labor intensity to the oil production workers. [0003] At prese...

AI Technical Summary

Problems solved by technology

The disadvantages of these sealing methods are: in most of the existing high water content, leakage and corrosive liquids, the wear cycle is short, easy to leak, and the work of replacing the packing is frequent. When replacing, the old packing that cannot be worn out needs to be removed Pull it out and add new packing, and various tools such as screwdrivers and hammers are required to fasten the old packing, especially for wellheads with severe partial wear. After the old packing is strongly compressed, it is difficult to pull out on the side of the polished rod. It is not easy to add new packing, which greatly increases the labor intensity of workers and delays the oil production time

At present, although the special-shaped packing type transverse sealing mechanism technology has replaced the traditional rubber gate valve and packing box, there is no need to vent the pressure of the oil pumping pipeline when changing the packing, which saves the preparation for replacing the packing time, but the unreasonable structure of the existing sealing technology leads to an increase in product height, which affects the safety distance between the wellhead and the rope hanger and the adjustment range of the swabbing stroke, and at the same time, the packing lacks lubrication in high water content, interleaved, and corrosive liquids The wear is accelerated, and workers have to stop the well frequently to replace the packing

In very few sites, it is useful to hang the plastic bottle with engine oil upside down on the rope hanger to let the engine oil flow to the polished rod to lubricate and reduce the wear of the packing, but this method does not flow into the engine oil when the packing is well sealed The oil cannot reach the sealed area, and the oil accumulation above the wellhead pollutes the wellhead, and the well control management of the oilfield does not allow this kind of operation

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