RU2704512C1 - Method of pipeline well waterproofing - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: invention relates to linear structures of underground pipelines, namely, to methods of producing watertight isolation of inspection process wells. Proposed method comprises the following steps: production of sealed shell from polymer membrane in production conditions; stage of preparatory works at the platform near the process well on the linear part of the main oil pipeline; stage of tight shell installation on process well; stage of final works.

EFFECT: improving operational reliability of waterproofing restoration and increasing durability of waterproofing due to application of shell from polymer membrane.

9 cl, 3 dwg

Description

The invention relates to linear structures of underground pipelines, and in particular to methods for producing waterproof insulation of viewing technological wells.

The prior art patent for utility model RU 158115 (published: 12/20/2015, IPC: F16L 55/00) is known, which is dedicated to restoring the operational characteristics of technological wells with impaired tightness during overhauls. The sealed joint of the technological wells of the pipeline is located in the gap between the pipeline and the technological well and is formed by a fixing plug of polymer material in the cured state located on the inner surface of the bottom of the well and an absorbent cord placed on the outer surface of the technological well along the interface line between the well and the pipeline. The polymeric material is an epoxy resin, and the absorbent cord is made of graph plastic or polyurethane.

The disadvantages of the proposed method of waterproofing is the complexity of the sealing technology, low reliability of the restoration of the entire sealing circuit due to the difficulties of quality control in the field.

The patent for utility model RU 62207 (published: 03/27/2007, IPC: F17D 5/00) is also known in the prior art, which describes a waterproofing method implemented in a well to monitor the operation of the pipeline and its equipment.

The well contains a hollow body with two holes, one of which is equipped with a movable cover, and the second is located opposite the pipeline. Such a well is hermetically connected to the pipeline body by means of an element of hermetic fixed connection of the well body to the pipeline, which is configured to jointly enclose the pipeline in the form of a half coupling and a half ring, while it is equipped with seals for hermetically fixed connection of the well body to the pipeline, the half coupling being made as halves of a round hollow cylinder, cut along the longitudinal axis, with a hole and hermetically attached to the body so that the second hole in to rpuse coupling half and opening in the same, while around the opening in the coupling half has a seal consisting of a rubber layer with an adjacent layer of sealant.

The disadvantages of this method of waterproofing is the fragility and low reliability, as well as the limited operational capabilities of the restoration of the sealing coating. These shortcomings are due to the fact that in the conditions of the passage of the pipeline in flooded frost-hazardous soils, waterproofing in the form of a layer of rubber and sealant becomes unusable, unable to withstand temperature differences and soil movements in the layer of seasonal freezing, and re-installing a similar waterproofing in a flooded well is laborious and ineffective.

The problem to which the invention is directed is the restoration of the waterproofing of technological wells.

The technical result of the present invention is to increase the operational reliability of waterproofing and increase the durability of waterproofing through the use of a shell made of a polymer membrane.

The problem is solved, and the technical result is achieved by the fact that the method of waterproofing the well of the pipeline, according to the invention, includes the step of manufacturing an airtight shell from a polymer membrane under production conditions, the stage of preparatory work on the site near the technological well on the linear part of the main oil pipeline, the stage of installing the airtight shell on the technological well, the stage of final work, while at the stage of manufacturing a sealed shell, the fabric is cut from a polymer membrane s thereby welding individual patterns into a single sealed sheath with the formation of a seam, at the stage of preparatory work using a technique, arrange a working pit, at the stage of installation, put a sealed sheath on the well through its neck, connect the hermetic sheath to the pipeline and the neck of the well using glue composition, after that the hermetic shell is fixed on the pipeline and the neck of the well with clamps, after which a weld is formed along the lower generatrix of the hermetic shell the longitudinal axis of the pipeline, at the stage of final works well lead to a working state.

In addition, the method of waterproofing a well in a pipeline is characterized by the following particular features:

- the polymer membrane for the manufacture of a sealed enclosure is a rolled polymer waterproofing material based on polyvinyl chloride;

- cutting the fabric from a polymer membrane is produced with the receipt of six separate patterns;

- manual welding of patterns is carried out using hot air with a choice of temperature from 400 ° C to 510 ° C;

- the seam is formed by overlapping the edges of the canvas with an overlap width of at least 60 mm;

- mounting loops are installed on the sealed enclosure;

- a fire truck, a mobile automobile repair shop, an onboard car with a manipulator, an excavator, a bulldozer, a trawl, a tractor unit, a motor pump, an apparatus for welding polymer membranes are used as attracted equipment;

- the connection of the hermetic shell with the pipeline and the neck of the well is carried out using polyurethane adhesive composition;

- an airtight shell to the pipeline and the neck of the well is fixed with stainless steel clamps.

The invention is illustrated by drawings, where in FIG. 1 shows a general view of a technological well with a sealed enclosure; FIG. 2 is a diagram of a pattern of a polymer membrane; FIG. 3 is a longitudinal section of a connection site of a sealed shell with a pipeline.

In FIG. 1-3 indicated:

1 - technological well;

2 - pipeline;

3 - sealed shell;

4 - pattern;

5 - side of the pattern;

6 - polyurethane adhesive composition;

7 - a collar;

8 - working pit;

9 - weld;

A method of waterproofing a well in a pipeline includes the following steps:

- the stage of manufacturing an airtight shell from a polymer membrane in a production environment;

- the stage of preparatory work on the site near the technological well on the linear part of the main oil pipeline;

- the stage of installation of the sealed shell on the technological well;

- stage of final work.

At the stage of manufacturing an airtight shell in the conditions of production, the cutting of the fabric from a polymer membrane (PM) is performed. As a polymer membrane, LOGICROOF T-SL rolled polymer waterproofing material is used, which is a two-layer unreinforced membrane. The membrane is a single sheet of plastic mass obtained by extruding polyvinyl chloride (PVC), fillers and processing aids.

For cutting, roll the PM roll, markup according to the scheme corresponding to the shape and geometric dimensions of the technological well 1 (Fig. 1), perform cutting of the insulating material to obtain six separate patterns 4 (Fig. 2, a, b, c, d, d, e).

Dust removal and degreasing of the surface at the junction of the individual patterns 4 of the hermetic shell 3 is carried out. Next, the individual patterns 4 are welded together to form a sealed shell with the formation of a seam. Manual welding of patterns is performed with hot air, in particular, using a special manual apparatus - a hot air dryer with a choice of temperature from 400 ° C to 510 ° C depending on humidity and air temperature and welding speed.

The seam is formed by overlapping the edges of the canvas with an overlap width of at least 60 mm. First, a partial tack is carried out in order to prevent the displacement of the cloths of the patterns relative to each other. To do this, place the heated nozzle of the hair dryer between the paintings of the patterns to a depth of more than 40 mm and press the canvas for a short time at the base of the nozzle of the hair dryer. Finding a heated nozzle, as well as pressing, should be short-lived, no longer than 2-3 seconds. The number of tacks per running meter of the weld is at least 6 pcs. The number of tacks can vary depending on the node being run. A correctly made tack should easily come off, leaving almost no traces on the pattern.

After the tack, a thermal pocket is formed, for which preliminary welding of the cloths of the patterns is performed. To do this, quickly carry out a hairdryer along the seam, rolling the pattern with one edge of the presser roller and resting it against the edge of the hairdryer nozzle. This will prevent the leakage of hot air during main welding. After preliminary welding, the front part of the overlap should remain free for final welding.

For final welding, insert a hot dryer into the heat pocket at an angle of approximately 45 °. In this case, the tip of the dryer nozzle should look 3-4 mm out of overlap. Smoothly and at a constant speed carry the hair dryer along the seam. Maintain a distance of 5-7 mm, rolling the roller parallel to the nozzle edge, while not allowing the roller to catch up with the nozzle. The roller is driven parallel to the nozzle of the dryer, setting the amplitude of its movement, which should exceed the width of the seam. At the stage of manufacturing an airtight shell 3 from a polymer membrane under production conditions, the sides 5 of the patterns 4 (Fig. 2) are not welded. They are connected to the surfaces of the pipeline and the neck of the well with a polyurethane adhesive at the stage of installation of the sealed shell on the technological well. At the end of the first stage, mounting loops are installed on the shell (not shown in FIGS. 1, 2, 3).

The stage of preparatory work on the site near the technological well on the linear part of the main oil pipeline includes the delivery of necessary materials and equipment. The equipment involved includes a fire truck, a mobile automobile repair shop (PARM), an on-board vehicle with a manipulator, an excavator, a bulldozer, a trawl, a tractor unit, a motor pump, an apparatus for welding PM membranes.

Using this technique, a fragment of the fence is removed to access the repaired technological well, the crushed stone coating of the area around the well is removed, the soil is mechanized and manually worked up to the level of -0.600 from the lower generatrix of the main pipeline 2. After the construction of the working pit 8 (Fig. 1), alignment of the structure of the well relative to the vertical with tightening nuts, turn off the impulse lines (not shown in Fig. 1, 2, 3), carry out the dismantling of the pipeline insulation and pumping water when it is availability in the well.

At the installation stage, the hermetic shell, the hermetic shell 3 is put on with the help of mounting loops on the technological well 1 through its mouth, the surface of the pipeline 2 is freed at the junctions of the shell from insulation to the width of the shell adjacency. The freed surfaces are cleaned, degreased and a primer is applied to them.

The connection of the hermetic shell 3 with the pipeline 2 (Fig. 3) is carried out using a polyurethane adhesive composition 6. After gluing the shell to the pipeline, it is fixed with stainless steel clamps 7. The connection of the shell with the neck of the well is carried out according to the scheme of combining with the pipeline. After applying the primer and adhesive composition 6 to the surface of the neck of the well, a sealed shell 3 is connected and fixed with a stainless steel clamp 7. On the lower generatrix of the sealed shell, a weld 9 is formed along the longitudinal axis of the pipeline.

At the stage of final works, the technological well is brought into working condition: they connect the impulse lines, backfill the soil with a mechanized and manual method, restore the macadam coverage of the work site, and reassemble the fragment of the fence.

The inventive method was tested in the field in the open air at a negative temperature in mid-March, the well of the stop valve assembly, subject to flooding, requiring restoration of tightness, was located in the Vyborg district of the Leningrad region, on the linear part of the main pipeline DN 1000. After the implementation of the claimed method, in the spring flood from April to May, was repeatedly monitored for the presence of water inside the well, which confirmed its absence.

The application of the method of waterproofing a well of a pipeline using an airtight shell made of a polymer membrane made under production conditions increases operational reliability and ensures the specified durability of sealing.

Claims (9)

1. A method of waterproofing a well in a pipeline, characterized in that the step is to carry out the stage of manufacturing an airtight shell from a polymer membrane under production conditions, the stage of preparatory work on the site near the technological well on the linear part of the main pipeline, the stage of installing the airtight shell on the technological well, the stage of final work, at the same time, at the stage of manufacturing a sealed enclosure, the fabric of the polymer membrane is cut, then individual welds are welded the shafts to each other in a single sealed shell with the formation of a seam, at the stage of preparatory work, a working pit device is installed using the technique, at the stage of installation, the sealed shell is put on the well through its mouth, the sealed shell is connected to the pipeline and the neck of the well using an adhesive, after which the tight shell is fixed on the pipeline and the neck of the well with clamps, after which a weld is formed along the longitudinal axis of the pipeline along the lower generatrix of the tight shell, this ne final works bring the well into working condition. 2. The method according to p. 1, characterized in that the polymer membrane for the manufacture of a sealed enclosure is a rolled polymer waterproofing material based on polyvinyl chloride. 3. The method according to p. 1, characterized in that the cutting of the fabric of the polymer membrane is produced with six separate patterns. 4. The method according to p. 1, characterized in that the manual welding of the patterns is carried out using hot air with a choice of temperature from 400 ° C to 510 ° C. 5. The method according to p. 1, characterized in that the seam is formed by overlapping the edges of the canvas with an overlap width of at least 60 mm. 6. The method according to claim 1, characterized in that mounting loops are mounted on the sealed enclosure. 7. The method according to claim 1, characterized in that a fire truck, a movable automobile repair shop, an onboard vehicle with a manipulator, an excavator, a bulldozer, a trawl, a tractor unit, a motor pump, an apparatus for welding polymer membranes are used as the involved equipment. 8. The method according to p. 1, characterized in that the connection of the sealed shell with the pipeline and the neck of the well is carried out using polyurethane adhesive composition 9. The method according to p. 1, characterized in that the hermetic shell to the pipeline and the neck of the well is fixed with stainless steel clamps.

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