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Pre-filming device and pre-filming system

A pre-membrane device and pre-membrane technology, which is applied in the direction of coating, liquid coating device on the surface, etc., can solve the problems of corrosion inhibitor leakage and achieve the effect of stable consumption speed

Pending Publication Date: 2020-09-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a pre-membrane device and a pre-membrane system, which are used to solve the problem of easy corrosion inhibitor leakage when at least one of the two pigs is removed

Method used

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  • Pre-filming device and pre-filming system
  • Pre-filming device and pre-filming system

Examples

Experimental program
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Effect test

Embodiment 1

[0046] see figure 1 , the pre-film device provided by the embodiment of the present invention, when traveling in the pipeline, the upper part of the figure is the front, and the lower part is the rear. The inside of the pipeline described in this specification refers to the space enclosed by the inner wall of the pipeline, not the interlayer of the pipeline wall.

[0047] see figure 1The pre-membrane device provided by the embodiment of the present invention includes an accommodating device 6. The accommodating device 6 includes a piston cylinder 61 whose outer diameter is smaller than the inner diameter of the pipeline and a piston 62 that is tightly fitted with the inner wall of the piston cylinder 61. The piston 62 is along the inner wall of the piston cylinder 61. axial movement. The piston 62 separates the piston cylinder 61 into a corrosion inhibitor chamber and a gas chamber, figure 1 Between the front end of the middle piston barrel 61 and the piston 62 is formed a ...

Embodiment 2

[0080] The following fit Figure 5 , Image 6 Describe the mechanical structure and electrical structure of the pre-film system in detail.

[0081] see figure 1 , the rear end of the pre-film device is provided with a universal connector 8, and the universal connector 8 is used to connect the front end of another pre-film device. An embodiment of the present invention provides a pre-film system, including at least two pre-film devices provided in the foregoing embodiments, and two adjacent pre-film devices are connected by a universal connector 8 .

[0082] In the pre-filming system provided by the embodiment of the present invention, the pre-filming device on the front side of any universal connector 8 is a pre-filming device, and the pre-filming device on the rear side is a post-filming device. It can be understood that when a plurality of pre-film devices are connected together, for example, a total of five pre-film devices are connected together from front to back. The...

Embodiment 3

[0098] In the pre-film system provided by the embodiment of the present invention, each pre-film device is provided with all the aforementioned electrical components like the above-mentioned pre-film device, and each pre-film device is provided with a jumper for connecting other pre-film devices. line group. It allows a pre-film device to be set at any position of the pre-film system, and only needs to adjust the connection of electrical components to form a linkage circuit. And because the adjacent pre-filmers are connected by the universal connector 8, the angle between the adjacent pre-filmers is constantly changing, so the jumper set includes a section of flexible cord.

[0099] Exemplary, please continue to Figure 5 In the pre-film system provided by the embodiment of the present invention, the limit switches of all pre-film devices include normally open contacts and normally closed contacts. It can be that the pre-filming device is filled with corrosion inhibitor alon...

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Abstract

The invention provides a pre-filming device and a pre-filming system, relates to the technical field of corrosion resistance of inner walls of pipelines, and is used for solving the problems that theamount of the corrosion inhibitor between two pipe cleaners for pre-filming cannot be adjusted and leakage of the corrosion inhibitor is caused when one of the pipe cleaners is detached as the corrosion inhibitor is reserved between the two pre-filming devices. The pre-filming device comprises an elastic sealing plate and an elastic pre-filming plate and an accommodating device, wherein the elastic sealing plate and the elastic pre-filming plate are arranged in a to-be-pre-filmed pipeline and are in clearance fit with the inner wall of the pipeline, and the elastic sealing plate, the elastic pre-filming plate and the inner wall of the pipeline between the elastic sealing plate and the elastic pre-filming plate form a pre-filming space; and the accommodating device is provided with a corrosion inhibitor accommodation cavity with volume which is controlled to change, wherein the corrosion inhibitor accommodation cavity is connected to a corrosion inhibitor injection pipe and a corrosioninhibitor discharge pipe, and the corrosion inhibitor discharge pipe communicates to the pre-filming space; and the corrosion inhibitor injection pipe is provided with a first valve, and the corrosion inhibitor discharge pipe is provided with a second valve. According to the pre-filming device and the pre-filming system, the corrosion inhibitor is stored in the pre-filming device. It is clean todetach the pre-filming device and the corrosion inhibitor is not wasted.

Description

technical field [0001] The invention relates to the technical field of pipeline inner wall anticorrosion, in particular to a pre-film device and a pre-film system. Background technique [0002] Pipelines transporting oil are prone to corrosion during operation. In order to extend the operating life of the pipeline and reduce economic losses, before the pipeline is put into operation, it is necessary to use a pig to pre-coat a layer of corrosion inhibitor as a protective film inside the pipeline to prevent the medium transported in the pipeline from directly contacting the pipeline. The launch system is used to launch the pig. The ball system increases the pressure of the gas in the pipeline, so that the pressure on the rear end of the pig is high and the pressure on the front is low, so that the pig moves along the pipeline under the pressure difference between the front and rear ends. A ball system without a pre-coating process cannot pre-coat the pipeline, and a ball sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C7/08B05C11/10
CPCB05C7/08B05C11/10
Inventor 赵晓东张予杰卢庆庆胡再元柴雷黄金华王勇徐箭王辉常有青刘建亮潘伟王仲平廖吉清
Owner PETROCHINA CO LTD
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