SU1702067A1 - Method for closing pipeline interior - Google Patents

Abstract

The invention relates to the oil and gas industry and ensures the reliability of pipeline shut-off during emergency repair work by supplying pressure to the pipeline through openings on either side of the leakage place directly into the flow of the pumped medium of the sealing material. The distinction of the proposed method is that a mixture of rubber and porophor is used as a sealing polymer material with the following ratio of components, wt.%: Isoprene rubber 90-92: porophore 8-10, the polymer being saturated with an inert gas under pressure before entering the pipeline.

Description

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The invention relates to the oil and gas industry and can be used in the repair of pipelines.

Mechanical methods of pipeline ipenopolyurethane interlocking are known.

The disadvantage of these methods for blocking pipelines is the lack of tightness of the blocking and the long duration of their installation, disassembly and elimination of accidental damage, with the need to perform labor-intensive operations.

The closest technical solution is the method of hermetically sealing the pipeline by introducing a polymeric material into it.

However, this method has insufficient tightness of the overlapped section (as well as duration) and laboriousness of the process of blocking the cross section of the pipeline.

The purpose of the invention is to ensure reliable overlap.

The goal is achieved by the fact that in the known method of blocking the cavity of the pipeline, which includes supplying pressure to the pipeline through openings on either side of the leak, directly into the flow of the pumped medium of the sealing polymer material, the latter uses a softer polymer in the form of a mixture of rubber and porous with the following ratio of components, wt.%:

Isoprene rubber90-92

Porofor8-10,

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moreover, the polymer before entering the pipeline is saturated with an inert gas under pressure.

The method allows to obtain elastic foam plugs with a predominantly closed cell type, which ensures gas tightness of the tampon and reliable localization of the defective part of the pipeline.

For example, a metal pipe 150 mm in length 2 m with a lid closed with one end end and a gas inlet. In the pipe at a distance of 1 m from its ends, a hole was drilled mm

In the side of the pipe, using a V.Fachini screw extruder mounted on a lathe base, at 100 rpm and 190–200 ° C, 5.2 kg of a mixture of isoprene rubber (SKI-3) and porophore were fed. azodicarbamide in the ratio of 10: 1.

. When passing through the extruder heated to 190–200 ° C, the mixture of rubber and pore warms up. Porophore decomposes with the release of nitrogen, which dissolves in softened rubber, Porofor-azodicarbamide (grade 4x3-21), in addition to a source of gaseous nitrogen (gas number 190 m / g), is a source of free radicals that crosslink the isopropyl macromolecules new rubber SKI-3. Nitrogen-saturated and softened, partially cross-linked rubber enters the tube cavity under pressure and expands due to the difference in pressure and temperature, forming an elastic foam tampon. In a heated pipe, due to elasticity and overpressure, the foam swab fits tightly against the walls of the pipeline, ensuring reliable insulation of the defective section. The pipe is filled within 80 minutes to form an elastic

75 cm long foam pad with an apparent density of 385 kg / m3.

After a few days, an inert gas cylinder fitted with a reducer with an exemplary manometer was connected to the pipe cap fitting and gradually increased the pressure in the pipe. A gas breakthrough was observed at a pressure of 0.2 kg / cm2, i.e. the tampon could withstand a load of 353 kg.

The proposed method allows the use of many elastic polymeric materials, their compositions or wastes to create a tampon.

When using the proposed method, time and material costs for sealing emergency sections of pipelines are reduced, reliability of overlapping and localization of a defective section of pipeline from gas or oil transported is increased, which ensures safer conditions for carrying out emergency restoration works.

Claims (1)

Invention Formula The method of blocking the cavity of the pipeline, including the flow under pressure into the pipeline through openings on both sides of the leakage place directly into the flow of the pumped medium of the sealing polymer material, is distinguished by the fact that, in order to ensure reliability of the blocking, softened polymer is used as a sealing material a mixture of rubber and poroporo with the following ratio of components, wt.%: Isoprene rubber90-92 Porofor8-10, moreover, the polymer before entering the pipeline is saturated with an inert gas under pressure.