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Movable self-sealing preventor

A technology of sealing device and sealing ring, which is applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of inconvenient operation, short service life, anti-hanging, poor sealing effect, etc., and achieve extended The effect of improving service life, improving service life and preventing collision

Inactive Publication Date: 2010-12-01
濮阳市益新石油技术有限公司
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The self-sealing currently used is installed coaxially with the self-sealing rubber core and the shell, and due to the influence of the deviation of the derrick and the swing of the traveling block, when passing through the coupling, the anti-hanging and sealing effects are poor, and the service life is short; the current annular blowout preventer , if it is installed and used in minor repair work, the wellhead will be high and the operation will be inconvenient. At the same time, it will need to be equipped with a hydraulic source and the cost will be high

Method used

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Embodiment Construction

[0017] As shown in the figure, the upper shell is connected with the lower shell, and a rubber core is arranged in the space formed by the upper shell and the lower shell. The outer diameter of the rubber core is smaller than the inner diameter of the space formed by the upper casing and the lower casing, and the rubber core can move in the radial direction along with the swing of the pipe string in the space formed by the upper casing and the lower casing.

[0018] A sealing ring is arranged between the upper shell and the lower shell.

[0019] The distance between the upper and lower end surfaces of the space formed by the upper casing and the lower casing is smaller than the length of the coupling.

[0020] The upper and lower end surfaces of the rubber core always partially overlap with the upper and lower end surfaces in the shell.

[0021] The diameter of the inner hole of the rubber core is smaller than the diameter of the tubing.

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Abstract

The invention relates to a self-sealing preventor for an oil well. In the movable self-sealing preventor, an upper shell is connected with a lower shell; and the movable self-sealing preventor is characterized in that: a rubber core is arranged in a space formed between the upper shell and the lower shell; and the rubber core can move radially together with the swing of a tubular column. The movable self-sealing preventor has the advantages of good sealing property, long service life, simple structure and convenient maintenance.

Description

Technical field: [0001] The invention relates to a self-sealing plug-in device for oil wells. Background technique: [0002] At present, in the process of downhole operations, it is necessary to complete the well plugging device and self-sealing, especially in the construction of overflow wells, spouting pumping, sand flushing, drilling plugs, etc., it is more necessary to adjust the space between the tubing and the casing. Seal it. The self-sealing currently used is installed coaxially with the shell due to the self-sealing rubber core, and due to the influence of the deviation of the derrick and the swing of the traveling block, when the coupling is passed, the anti-hanging and sealing effect is poor and the service life is short; the current annular blowout preventer , If it is installed and used in the construction of minor repair operations, the wellhead will be high and the operation will be inconvenient. At the same time, it needs to be equipped with a hydraulic source an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/03
Inventor 袁海坤张素敏党卫白彦岭娄京伟莫青海
Owner 濮阳市益新石油技术有限公司
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