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A kind of downhole washable well water injection intubation sealing device

A sealing device and well flushing technology, applied in the directions of sealing/isolation, wellbore/well components, cleaning appliances, etc., can solve the problem that the concentric double-pipe sub-injection sealing mechanism cannot perform self-cleaning, etc., to solve the problem of easy scaling and Falling matter deposition, efficient development effect, effect of improving success rate

Active Publication Date: 2018-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the conventional concentric double-tube dispensing sealing mechanism cannot perform self-cleaning, enhance the sealing reliability of the intubation seal, and improve the success rate of the concentric double-tube dispensing

Method used

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  • A kind of downhole washable well water injection intubation sealing device
  • A kind of downhole washable well water injection intubation sealing device

Examples

Experimental program
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Effect test

Embodiment 1

[0016] This embodiment provides a kind of downhole washable well water injection insertion pipe sealing device, such as figure 1 As shown, it includes a tubular main body joint 1, a sheath 4 and a lower joint 7 connected sequentially from top to bottom. The inner diameters of the tubular sheath 4 and the lower joint 7 are equal, and the tubular main body joint 1 The inner diameter of the body is gradually changing, gradually increasing from the bottom to the top, and its minimum inner diameter is equal to the inner diameter of the sheath 4 and the lower joint 7; the pipe wall of the main body joint 1 is also provided with an installation hole penetrating the pipe wall , the installation hole is equipped with a check valve 2, so that the main body joint 1 is unidirectionally conducted from the outside of the pipe wall to the inside of the pipe wall.

[0017] The downhole washable well water injection insertion pipe sealing device of this embodiment can be used in backwash well ...

Embodiment 2

[0023] On the basis of Example 1, this example is further described. In this example, the inner wall of the main body joint 1 is annular and stepped from bottom to top, and the inner diameter of the lowermost stepped ring is equal to that of the sheath 4 and the lower joint 7. the inside diameter of. The annular stepped shape makes the inner wall of the main body joint 1 and the cannula 15 not in contact with each other, so that the cleaning fluid passes through the check valve 2 to clean the scaling and sediment at the sealing part of the cannula sealing device 10, Conditions and space are provided.

[0024] In order to ensure the sealing of the overall device, in this embodiment, the lower part of the inner wall of the main body joint 1 and the upper part of the inner wall of the lower joint 7 are provided with dust-proof rings 3, and the upper and lower parts of the inner wall of the sheath 4 are equipped with sealing gaskets 5 , Gasket 5-position V-shaped composite gasket...

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Abstract

The invention belongs to the technical field of layered water injection development in oilfields, and relates to a downhole washable well water injection intubation sealing device, which includes a tubular main body joint, a sheath and a lower joint, the inner diameters of the sheath and the lower joint are equal, and the tubular main body joint has the same inner diameter. The inner diameter is gradually changing, and the inner diameter gradually becomes larger from the bottom to the top, and its minimum inner diameter is equal to the inner diameter of the sheath and the lower joint; the pipe wall of the main body joint is also provided with a mounting hole penetrating the pipe wall, and a single Flow valve, so that the main body joint is unidirectionally connected from the outside of the pipe wall to the inside of the pipe wall. This kind of downhole flushable well water injection cannula sealing device can not only meet the sealing requirements of the concentric double-pipe dispensing cannula in the dispensing well, but also effectively solve the problem. Due to the inability of the conventional concentric double-tube dispensing sealing mechanism to perform self-cleaning, the seal of the cannula is prone to fouling and debris deposition, and eventually the cannula seal fails. The success rate of split injection operation can realize the efficient development effect of split injection wells in oilfields.

Description

technical field [0001] The invention belongs to the technical field of layered water injection development in oil fields, and in particular relates to a downhole washable well water injection insertion pipe sealing device. Background technique [0002] At present, the produced water in Changqing Oilfield is poor in quality and highly corrosive, resulting in a high resistance rate in the monitoring and adjustment of the produced water injection well; at the same time, the existing separate injection process needs to be measured and adjusted, which is expensive and cannot reflect the water injection status of the water injection well in real time . [0003] To this end, a concentric double-pipe separate injection technology was studied, which avoided the problem of downhole measurement and adjustment, realized the transformation from underground measurement and adjustment of separate injection wells to surface automatic measurement and adjustment, and further improved the sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/10E21B43/20E21B37/00
Inventor 王薇姚斌巨亚锋王守虎王俊涛申晓莉何汝贤胡改星王晓娥
Owner PETROCHINA CO LTD
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