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plug

A plug, sliding sleeve technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problems of long plugging time, easy blowout accidents, etc. Eliminate the effect of blowout accidents

Active Publication Date: 2017-09-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of the existing technology that when unblocking after the controllable snubbing operation is completed, the downhole pressure is suppressed due to long plugging time, and blowout accidents are prone to occur

Method used

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0033] See figure 1 . The occluder 10 provided by the embodiment of the present invention includes a central tube 27 having a first end 1 and a second end 2 opposite to each other, and the central tube 27 is close to the side walls of the first end 1 and the second end 2 A liquid inlet hole 26 and a liquid outlet hole 28 are respectively opened on the top; a sealing rubber sleeve 23 is sleeved outside the central tube 27, and the sealing rubber sleeve 23 is locate...

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Abstract

The occluder provided by the present invention comprises: a central tube having a first end and a second end opposite to each other, and a liquid inlet hole and a liquid outlet hole are respectively opened on the side walls of the central tube near the first end and the second end; A sealing rubber sleeve outside the central tube; a sliding sleeve that is slidably connected to the first end of the central tube. The sliding sleeve has a first working position for sealing the liquid outlet hole, and a second working position for releasing the plugging of the liquid outlet hole Location. The chamber of the occluder of the present invention and the liquid inlet hole and the liquid outlet hole connected thereto provide a fluid channel; when unsealing, the sliding sleeve is lifted up to make it switch from the first working position to the second working position, and the bottom of the well The high-pressure liquid returns upward through the formed fluid channel to achieve the purpose of pressure relief and prevent blowout accidents from the source.

Description

technical field [0001] The application belongs to the technical field of oil and gas development, and in particular relates to a plug. Background technique [0002] With the development of oil and gas fields in the middle and later stages, the reservoir pressure decreases and the number of low-pressure wells increases. At present, for low-pressure wells, it is necessary to inject well-killing fluid to kill the well during operation to increase the pressure of the reservoir, and for wells with serious leakage, it is necessary to adopt multiple killing methods to increase the pressure of the reservoir. However, the injection of killing fluid will pollute the oil layer, increase the pumping and drainage period after operation, increase formation water storage and increase the cost of sewage circulation treatment, and bring difficulties to the production recovery of oil wells after operation. Therefore, it is necessary to adopt controllable unsnubbing operations for low-pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12E21B23/01E21B34/06
Inventor 于雷李洪斌武雅慧惠晓永于超杜凯荆琪欧阳涛付玉红
Owner PETROCHINA CO LTD
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