A non-stop expansion expansion pipeline plugging device

Abstract

The invention provides a high-performance online pipeline plugging device and a plugging method thereof. The device comprises a pipeline joint device, a pipeline transition control joint device, a pipeline opening device, an opening remaining iron scrap removing device, a pipeline plugging and conveying device, a pipeline inner wall cleaning device, an expansion type pipeline plugging device, a pipeline plugging temporary maintenance device and a pipeline opening perpetual sealing device. The plugging device has the advantages that residual trepanning iron scraps on the inner wall of a pipeline and impurities at a sealing position can be cleaned up, expansion of a sealing element can be controlled, the sealing element can be closely fitted with the inner wall of the pipeline, the device is particularly applicable to online plugging of spiral welding seam pipeline high-pressure gaseous conveying media, the pipeline is safely, reliably and conveniently maintained, and the sealing effect of zero leakage of the construction process can be achieved.

Description

technical field [0001] The invention relates to the technical field of pipeline construction, in particular to a high-performance non-stop pipeline inner wall cleaning device and a non-stop expansion type pipeline plugging device. Background technique [0002] During the normal use of oil and gas pipelines, several branch lines are often added to the pipeline due to production and living needs, and new branch lines will be added to the branch lines. The resulting huge pipeline network covers major In cities, in addition to the normal increase of branch lines, the original pipelines in use will be repaired or replaced due to reasons such as service life. Usually, on the pipelines in normal use, such as adding branch lines or repairing and replacing a certain section of pipelines, the construction is carried out by stopping the transmission. If the construction is stopped, it will cause great inconvenience to the production and life of users. How to continue It is the goal of...

AI Technical Summary

Problems solved by technology

This kind of device was first introduced from foreign countries by domestic oil companies. It was first applied to the construction of oil pipelines. In recent years, some people have also tried to apply this technology to gas pipelines. The shortcomings of practical application are that the plugging effect is not ideal and the construction is complicated. , has not been promoted, the main reasons are:

[0003] 1) The inner wall of oil and gas pipelines is complicated, and derivative chemicals and other debris are often attached. This technology simply relies on the extrusion of the seal and the inner wall of the pipeline, and it is difficult to achieve a tight fit between the seal and the pipe wall, especially when When applied to pipelines with high pressure (P>0.4MPa) or spiral welded pipelines, there will be a problem of medium leakage after sealing, especially for pipelines transporting gaseous medium, the leaked flammable gas will easily cause explosion and combustion;

[0004] 2) This technical principle is relatively suitable for petroleum medium, because the petroleum medium is viscous, dense and liquid. When the seal is not tightly bonded to the pipe wall and there is a gap, the leakage state is not particularly obvious, and the oil is in the liquid state. Construction can be carried out in the state of slight leakage or less leakage, but for gas medium with low density, flammable and explosive gas, construction cannot be carried out in the state of leakage;

[0005] 3) At present, this technology is used in the construction of pipeline plugging, because the plugging effect is not ideal, and two additional holes are usually opened near the plugging place (see figure 1 ), one hole is used to discharge or disperse the leaking part, and the other hole is used to place the plugging air bag to block the medium outflow of the leaking part, that is, if it is necessary to seal at both ends of the maintenance and reconstruction pipeline, after removing the bypass holes on both sides In addition, six holes need to be opened, resulting in complicated construction, increased construction cost, and difficult operation for non-professionals

[0006] 4) Compared with long-distance pipelines such as oil pipelines in the wild, urban public pipelines such as gas, heat and water supply are mostly located in the city center or suburbs. These areas have developed roads, many buildings, and dense population. Using existing technologies, when construction When the cycle is long, because the huge equipment cannot be disassembled during the construction process, it will not be able to be temporarily backfilled after the ground is excavated, seriously affecting urban traffic and people's normal life, and there is no good solution yet.

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