Valve well anti-seepage construction process

Abstract

The invention relates to the technical field of valve wells, in particular to a valve well anti-seepage construction process. The process comprises the following steps that the surface of a pipeline and a sleeve of a valve well are cleaned, an insulating support is arranged on the outer wall of the pipeline in a sleeving mode, the pipeline and the insulating support penetrate into the sleeve together from the outer wall of the valve well, and the pipeline is supported and fixed at the center of the sleeve; a gap between the sleeve and the pipeline is filled with a sealing assembly, at the side, close to the outer wall of the valve well, of the insulating support; a sealing surface formed by connecting the outer wall of the sleeve, the sealing assembly and the pipeline is covered with a thermal shrinkage layer; and a second sealing ring is arranged on the thermal shrinkage layer in a sleeving manner, and the second sealing ring is fastened by using a fastener. According to the valve well anti-seepage construction process, sealing and water proofing between the sleeve and the pipeline can be achieved, meanwhile, corrosion prevention of the sleeve and the pipeline is achieved, the process is suitable for anti-seepage sealing of an in-service oil and gas pipeline and a valve well penetration opening, an anti-seepage effect is obvious, and the process has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of valve wells, and more specifically, to a valve well anti-seepage construction process. Background technique [0002] The problem of anti-seepage of pipeline valve wells is a stubborn problem that has been plaguing all airport oil supply project builders at home and abroad since the application of apron pipelines. The valve well of the apron pipeline, as an important part of the main refueling mode of the current large and medium-sized airports, plays a pivotal role in the oil supply project. In recent years, the phenomenon of water seepage between the oil pipe and the steel casing of the valve well of the apron pipeline has emerged in an endless stream, especially in the valve well of the apron pipeline in the southern region. Due to the high groundwater level, the phenomenon of reverse seepage and backflow of groundwater is common. Due to the poor seal between the tubing and the casing in the valve well...

AI Technical Summary

Problems solved by technology

In recent years, the phenomenon of water seepage between the oil pipe and the steel casing of the valve well of the apron pipeline has emerged in an endless stream, especially in the valve well of the apron pipeline in the southern region. Due to the high groundwater level, the phenomenon of reverse seepage and backflow of groundwater is common. Due to the poor seal between the tubing and the casing in the valve well, the anti-seepage measures are not in place, and the water in the valve well often accumulates through the sealing gap between the tubing and the casing, so that it is necessary to send special personnel to carry out pumping operations. This is undoubtedly Increased labor costs, and further increased the corrosion rate of valves and connecting parts, bringing potential hidden dangers to production operations

[0003] At present, people generally realize the anti-seepage of valve wells mainly through water-stop steel plates plus Z-shaped sealing rings and heat shrinkable sleeves. The main feature is that the steel water-stop plate is used between the steel casing and the oil pipe inside the valve well. When the oil pipe is mechanically sealed, due to the frequent opening and closing of the refueling cock on the apron pipeline, the flow of the pipeline node changes greatly, the phenomenon of water hammer occurs frequently, and the pipeline trembles frequently, which in turn makes the water-stop steel plate scrape the outer anti-corrosion layer of the oil pipe, which not only reduces the oil pipe and The sealing effect between the steel casings also destroys the outer anti-corrosion layer of the oil pipe: at the same time, in the past, between the oil pipe outside the valve well and the steel casing, the Z-shaped sealing ring was affected by the construction of the outer ring heat shrinkable sleeve. Under the baking of the flame, the gum softens and deforms, the sealing effect decreases, and even the sealing performance is lost due to the high temperature of the baking flame, which greatly affects the overall sealing performance

[0004] Chinese patent CN202010729239.8 discloses a valve well and its construction method. The valve well includes a well body with an opening in the upper part. The opposite side walls of the well body are respectively provided with a first pipeline hole and a second pipeline hole. The water infiltrates into the well body through the first pipe hole or the second pipe hole, and a shock-absorbing seat mechanism is installed at the lower end of the well body. Although this scheme can improve the shock resistance of the well body, the first pipe hole and the second pipe hole are sealed. Not tight, easy to infiltrate water, causing corrosion to the well body and pipeline

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