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Airtight leak-prevention method for sealing gaps between wellhead packing box and polished rod

A packing box, air-tight technology, used in sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve the problem of increasing the hanging point load of the pumping unit, unsatisfactory sealing effect, and increasing the friction of polished rods. It can reduce the load, solve the oil leakage and reduce the friction force.

Inactive Publication Date: 2014-05-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method increases the friction force on the polished rod, which not only causes wear on the polished rod but also increases the load on the suspension point of the pumping unit, and the sealing effect is not ideal

Method used

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  • Airtight leak-prevention method for sealing gaps between wellhead packing box and polished rod
  • Airtight leak-prevention method for sealing gaps between wellhead packing box and polished rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] (1) if figure 1 As shown, the anti-leakage device box has two semi-cylindrical structures, which are fixed above the packing box 10 by fixing buckles 12 , and the sealing rubber ring 9 is used to seal the leak-proof device and the outer wall of the packing box 10 . There is a gear fixing hole 11 on the casing, and the length of the adjustable gear shaft 5 strokes increases sequentially from top to bottom by changing the large gears of three kinds of radii. The radius ratios of the small gear and the large gear in the gear combination 4 are 1:9, 1:10, and 1:12, which match the strokes of conventional pumping units of 3m, 3.6m, and 4.2m.

[0012] (2) if figure 1 As shown, the polished rod 1 moves upward, driving the roller 2 to rotate clockwise; the gear shaft 5 moves downward through the gear combination 4 changing direction; the gear shaft 5 drives the sealing baffle 6 to move downward, compressing the The gas achieves a sealing effect.

[0013] (3) if figure 1 As s...

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PUM

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Abstract

The invention discloses an airtight leak-prevention method for sealing gaps between a wellhead packing box and a polished rod. The airtight leak-prevention method is characterized in that the polished rod rotates to drive a roller to rotate, a sealing stop plate is enabled to perform reverse movement with the polished rod through directional change of a gear train, air inside a chamber is compressed, and the purpose of performing air sealing on the gaps between the wellhead packing box and the polished rod can be realized. The airtight leak-prevention method has the advantages of improving a method that sealing performance of a conventional leak-prevention device can be improved only by increasing extrusion, solving the problem about oil leak between the packing box and the polished rod, decreasing friction force between the leak-prevention and the polished rod and reducing load on a pumping unit suspension point.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, and relates to an airtight leak-proof method for sealing the gap between a polished rod and a wellhead packing box of a rod pumping system. Background technique [0002] Packing box is a kind of wellhead equipment of pumping unit, which contains sealing packing, and its function is to seal the wellhead of the pumping well, so as to ensure that the oil, gas and water in the oil well will not leak out. However, in actual production, oil leakage is a ubiquitous phenomenon because the gap between the wellhead packing box and the polished rod is not tightly sealed. The leakage process occurs during the upstroke stage of the polished rod. The loss of crude oil due to leakage not only wastes resources but also pollutes the environment. In response to this problem, more belt-type packing boxes are used in the field. The main principle is to improve the sealing performance through the extrusion of ...

Claims

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Application Information

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IPC IPC(8): E21B33/03
Inventor 何岩峰钟明张凯田仁连姜岩梁艳
Owner CHANGZHOU UNIV
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