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Oil layer leak-proof device

An oil layer leak preventer and oil layer technology, applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve problems such as inability to prevent pollution of oil layers, troublesome construction, leakage, etc.

Active Publication Date: 2014-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that once the oil layer is exposed, the sand, liquid and dirt will start to leak at the same time, so it can only reduce a part of the leak
Construction is also more troublesome
In addition, it cannot prevent the leakage of liquid and other dirt for operations such as well washing (wax removal, etc.), well killing, and oil replacement, and cannot prevent the oil layer from being polluted, resulting in production reduction or shutdown of the oil well.

Method used

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  • Oil layer leak-proof device
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  • Oil layer leak-proof device

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] Such as figure 1 As shown, a kind of oil layer leakage preventer, a spacer 2 is placed on the upper boundary of the oil layer oil inlet hole 5 of the casing 1, and a leakage prevention valve 7 is placed on the lower boundary of the oil layer oil inlet hole 5, and the leakage prevention valve 7 The third central pipe 8 is threadedly connected with the second central pipe of the packer 2 with the first central pipe 4 through the change button 6 and the collar 3 to form the entire oil layer leakage preventer. Such as figure 2 As shown, the anti-leakage valve 7 is made up of the third central tube 8, the outer valve seat 9, the valve core 10, the valve frame 11 and the leather cup 12, and the valve frame 11 is threadedly connected with the third central tube 8 and the outer valve seat 9, The valve frame 11 supports the valve core 10 upwards, the upper part of the leather cup 12 is embedded in the valve frame 11, and the leather cup 12 is pressed against the outer valve se...

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Abstract

The invention relates to an oil layer leak-proof device, which consists of a packer (2), a coupling (3), a first central pipe (4), an adapter connector (6) and a leak-proof valve (7), wherein the packer (2) is arranged inside a bushing (1) above an oil inlet hole (5) and adjacent to the oil inlet hole (5) of an oil layer, the leak-proof valve (7) is arranged inside the bushing (1) below the oil inlet hole (5) and adjacent to the oil inlet hole (5) of the oil layer, and a second central pipe, the coupling (3), the first central pipe (4), the adapter connector (6) and a third central pipe (8) in the leak-proof valve (7) are sequentially in thread connection with one another. The leak-proof valve (7) is an annular space check valve. By adopting the length of the first central pipe (4), the oil layer leak-proof device can be applied to the oil layer of different thicknesses. The oil layer leak-proof device is used for preventing the leakage on an oil well with severe leakage of the oil layer.

Description

technical field [0001] The invention relates to a downhole tool for petroleum mechanical oil extraction equipment, in particular to an oil layer leakage preventer for preventing formation leakage during operations such as sand flushing, well washing, well killing, and oil replacement in oil wells. Background technique [0002] At present, the existing comparatively good leakage prevention technology for sand washing is to wash sand with coiled tubing and use a leather cup to prevent leakage. Every few meters of sand washing, the oil pipe (sand washing pipe), leather bowl, etc. are lowered for several meters. The disadvantage is that once the oil layer is exposed, the sand, liquid and dirt will start to leak at the same time, so it can only reduce a part of the leak. Construction is also more troublesome. In addition, for operations such as well washing (wax removal, etc.), well killing, and oil replacement, it cannot prevent the leakage of liquid and other dirt, and cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12E21B34/08
Inventor 徐正彬褚月琴王强樊奖平
Owner PETROCHINA CO LTD