Double-sealing packing box for oil field wellhead and wellhead double-sealing method

A packing box, double sealing technology, applied in sealing/packing, wellbore/well components, earth-moving drilling, etc., can solve the problem of not reducing the height of the pumping unit, increasing the manufacturing cost of the pumping unit, safety and maintenance costs and other problems, to achieve the effects of compact structure, increased safety and reliability, and fewer accidents in the oil pumping system

Inactive Publication Date: 2012-10-03
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-stroke pumping unit adopts the ordinary packing box. The stroke length is related to the stroke of the polished rod, and the height of the pumping unit cannot be reduced, which increases the manufacturing cost, maintenance safety and maintenance cost of the pumping unit.

Method used

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  • Double-sealing packing box for oil field wellhead and wellhead double-sealing method
  • Double-sealing packing box for oil field wellhead and wellhead double-sealing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Oil field wellhead double-sealed packing box, which consists of: a steel wire rope end seal 21 for the steel wire rope 1 to penetrate, the steel wire rope end seal is connected to the packing box sealing device 22, and the packing box sealing device is connected to The large cross 16, the lower end of the upper packing box inner tube 17 of the packing box sealing device is connected to the lower joint 20 of the packing box, and the internal connection of the large cross is a joint 14 for fixing the steel wire rope. The above-mentioned live joint is connected with the steel wire fixed head 13, and the said live joint is connected with the live joint sleeve 15 for connecting the sucker rod.

Embodiment 2

[0022] In the aforementioned oilfield wellhead double-sealed packing box, the wire rope end seal includes a wire rope packing 3, the wire rope packing is connected to the wire rope pressure cap 2, and the wire rope pressure cap and the wire rope packing are sealed and locked sleeve 4, the locking sleeve is connected to the locking slip 5.

Embodiment 3

[0024] In the above oilfield wellhead double-sealed packing box, the packing box sealing device includes a packing bushing 6, and the packing bushing extends into the locking sleeve and is connected to the locking slip 5. The packing sleeve is connected to the packing pressing cap 7, the packing sleeve and the packing pressing cap are connected to the packing 10 together, and the packing pressing cap is connected to the packing inside the upper packing box Pipe 17, the inner tube of the upper packing box is covered with a sealing ring 19; the inner tube of the upper packing box is connected to the large packing 11, the large packing is connected to the large packing gland 9, and the large packing The gland is connected with the large packing gland 8.

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PUM

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Abstract

The invention discloses a double-sealing packing box for an oil field wellhead and a wellhead double-sealing method. At present, domestic wellhead devices for pumping wells use mechanical dynamic sealing. The double-sealing packing box for the oil field wellhead comprises a steel cable end sealing piece (21) through which a steel cable (1) pass, the steel cable end sealing piece is connected witha packing box sealing device (22) which is connected with a large four-way (16), the lower end of an upper packing box inner pipe (17) of the packing box sealing device is connected with a packing box lower joint (20), a movable joint (14) used for fixing the steel cable is connected into the large four-way, and the movable joint is connected with a steel cable fixing head (13) and is connected with a movable joint sleeve (15) used for connecting a sucker rod. The double-sealing packing box for the oil field wellhead and the wellhead double-sealing method are used for sealing the wellhead of the pumping well.

Description

Technical field: [0001] The invention relates to an oil production wellhead device, in particular to an oilfield wellhead double-seal packing box and a wellhead double-sealing method. Background technique: [0002] At present, the wellhead devices of domestic pumping wells use mechanical dynamic seals, that is, packing boxes to realize the sealing of polished rods (sucker rods) to prevent crude oil from leaking. [0003] Ordinary packing box, its function is to make the polished rod slide in it and seal the wellhead. The polished rod sealer is composed of the upper pot root box and the lower rubber gate. During normal oil pumping, the rubber packing in the upper pot root box can play the role of sealing and preventing blowout; after the lower rubber gate is tightened, the rubber packing can be safely replaced under normal production conditions. However, the stroke length of the common packing box used in the long-stroke pumping unit is related to the stroke of the polished ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/03
Inventor 刘春生武光生牛曙光张春清
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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