RU2769328C1 - Connection method for lined pipeline sections - Google Patents

Abstract

FIELD: pipeline equipment.

SUBSTANCE: invention relates to pipeline equipment and can be used for permanent welded connection of sections of lined pipelines used, for example, for transportation of well products. The method includes connecting the end sections of the sections of the lined pipeline 1, in each of which a sleeve 2 is installed flush with the end of the metal base 3 of the pipeline 1, and subsequent welding. Before installing the bushings 2 on the end sections of the sections of the connected metal-polymer pipeline 1 for a length L1 along the entire lateral inner surface, the thickness of the polymer coating 4 of the inner plastic lining is removed by diameter D1. Part of the length of the outer side surface of both bushings 2 is adjusted to the length L1 under the inner diameter D1 of the removed section of the polymer coating 4 of the inner plastic lining of pipeline sections 1. A high-temperature sealant 5 is applied to the outer surface of length L1 of diameter D1 of each sleeve 2 to ensure tightness between the polymer and metal, after which the surfaces of the sleeves 2 with the sealant 5 applied are pressed into each of the end sections of the sections of the metal-plastic pipeline 1 flush with the chamfers of the metal base 3 to the length L1 From the outer side surface of the insulating pipe 6 of each of the end sections of the sections of the metal-plastic pipeline 1, a part of the insulating coating is removed, after which the end parts of the bushings 2 and both parts of the metal base 3 of the sections of the metal-plastic pipeline 1 are welded.

EFFECT: pipeline equipment improvement.

1 cl, 1 dwg

Description

The technical field to which the invention belongs

SUBSTANCE: invention relates to pipeline equipment and can be used for permanent welded connection of lined pipeline sections used, for example, for transporting well products.

State of the art

A known method of connecting pipes with an internal coating (RF patent No. 2410593, class IPC F16L 13/02, published date 01/27/2011), which consists in the formation of the inner layers of the weld and the heat-affected zone of corrosion-resistant steel, followed by application to the inner surface insulating layer pipes. In the manufacture of pipes, an additional element of corrosion-resistant steel is introduced, made in the form of a ring, which is a pipe segment, the outer diameter of which is equal to the diameter of the pipe, and the inner diameter is equal to the inner diameter of the insulating layer of the pipe, and connected to the end part of the carbon steel pipe using welding, while obtaining the end part of the pipes in the form of thickened rings.

Known node welded pipes with internal coating (RF patent No. 89656, CL IPC F16L 13/02, date published 10.12.2009), containing welded pipes with an internal polymer coating and a sleeve installed in them, also with an internal polymer coating, on the outer the surface of which are elastic sealing cuffs and a centering ring. The sleeve is made with a central annular groove, in which a heat-insulating gasket is located, and two annular grooves, made on opposite sides of the central annular groove and intended for installing elastic sealing cuffs in them. On the centering ring there is an annular protrusion, to which the ends of the pipes to be welded are connected, the centering ring is split along the generatrix and installed over the heat-insulating gasket.

An equal bore welded joint of pipes with an internal polymer coating is known (RF patent No. 82022, class IPC F16L 13/02, date published 10.04.2009), containing metal pipes and a sleeve with subsequent welding. Preliminarily, sockets are made at the ends of the pipes to be welded, in which a sleeve with an internal polymer coating and an annular groove is installed, in which a heat-insulating material, for example, asbestos, is placed, while epoxy glue is applied to the ends of the sleeve before installation.

The disadvantage of these analogs is the need to use additional equipment, such as a centering ring. It is also necessary to make sockets at the ends of the welded pipes, in which a bushing with an internal polymer coating and an annular groove is installed, in which heat-insulating material is placed. During welding work during pipe installation, epoxy glue will lose its properties.

The closest in design is the method of connecting sections of a lined pipeline (RF patent No. 2712322, class IPC F16L 58/18, published date 01/28/2020), which includes providing each section of the lined pipeline with an insulating sleeve between the lining pipe and the main pipe and subsequent welding ends of the main pipes of the two sections of the lined pipeline with each other. At the end of the main pipe, temporarily reduce the diameter of the liner pipe and pull it through the main pipe and the insulating sleeve, ensuring that the liner pipe is restored to form a tight fit on the internal surfaces of the main pipe and the insulating sleeve that extends to the end of the liner pipe or protrudes beyond it and does not pass along the entire length of the lined pipeline section. The disadvantage is the technological complexity of the implementation of a constructive solution.

Disclosure of the essence of the invention

The technical result of the proposed method is to increase the maintainability and efficiency of the use of metal-polymer pipelines for transporting formation, bottom and fresh water in the RPM system in the conditions of the impossibility of using the standard length of the metal-polymer pipeline.

The technical result is achieved due to the fact that the method of connecting sections of lined pipelines is carried out using two bushings with subsequent welding, while before installing the bushings, at the end sections of the connected sections of the metal-polymer pipeline along the entire inner side surface, a layer of polymer coating of the inner layer is removed for a small length and depth. plastic lining, after which part of the length of the outer side surface of both bushings is adjusted to the length and inner diameter of the removed sections of the polymer coating of the inner plastic lining of the pipeline sections, while a high-temperature sealant is applied to the area of the removed outer surface of each bushing to ensure tightness between the polymer and metal, after that, the surfaces of the bushings with the applied sealant are pressed inside each of the end sections of the sections of the metal-plastic pipeline flush with the chamfers of the metal base, while from the outer side surface of the insulating of the ion tube of each of the end sections of the sections of the metal-plastic pipeline, a part of the insulating coating is removed, after which the end parts of the bushings and both parts of the metal base of the sections of the metal-plastic pipeline are welded.

Brief description of the drawings

On FIG. 1 shows the connection diagram of the sections of the lined pipeline.

Implementation of the invention

The proposed method for connecting sections of a lined pipeline is used to solve the problem of obtaining the required length of a metal-polymer pipeline of the same diameter with an external polyethylene coating and a polyethylene pipe lined inside if it is forbidden to cut pieces of a certain length due to the fact that during welding the internal polymer coating is melted under the influence of high temperature , and under the influence of high pressure fluid flow (about 4 MPa) can lead to blockage of the well production pipeline.

The method includes joining the end sections of the sections of the lined pipeline 1, each of which has a sleeve 2 flush with the end of the metal base 3 of the pipeline 1, and subsequent welding.

Before installing the bushings 2, at the end sections of the sections of the connected metal-polymer pipeline 1 for a length L1 along the entire lateral inner surface, the thickness of the polymer coating 4 of the inner plastic lining is removed for a diameter D1. Part of the length of the outer side surface of both bushings 2 is adjusted to the length L1 under the inner diameter D1 of the removed section of the polymer coating 4 of the inner plastic lining of pipeline sections 1 (for example, about 50 mm with a length of each bushing 1 from 100 to 300 mm, with an outer diameter of 73 mm, internal 57 mm).

High-temperature sealant 5 is applied to the outer surface of length L1 (for example, for a length of about 50 mm) of diameter D1 of each sleeve 2 to ensure tightness between the polymer and metal, after which, the surfaces of the sleeves 2 with applied sealant 5 are pressed into each of the end sections to the length L1 sections of the metal-plastic pipeline 1 flush with the chamfers of the metal base 3.

From the outer side surface of the insulating pipe 6 of each of the end sections of the sections of the metal-plastic pipeline 1, a part of the insulating coating is removed, after which the end parts of the bushings 2 and both parts of the metal base 3 of the sections of the metal-plastic pipeline 1 are welded.

The proposed method makes it possible to obtain the required length of a metal-polymer pipeline with an external polyethylene coating and a polyethylene pipe lined inside, in the event that it is forbidden to cut pieces of a pipeline of a certain length when transporting formation, bottom and fresh water in the RPM system, to repair not the entire section of the conduit, but only its part.

The proposed method for connecting sections of a lined pipeline is used in pipelines for transporting well products to OOO LUKOIL-PERM.

Claims (1)

A method of connecting sections of a lined pipeline using two bushings with subsequent welding, characterized in that before installing the bushings at the end sections of the connected metal-polymer pipeline along the entire inner side surface, the polymer coating layer of the inner plastic lining is removed for a small length and depth, after which part of the length of the outer the side surfaces of both bushings are adjusted to the length and to the inner diameter of the removed area of the polymer coating of the inner plastic lining of the pipeline sections, while a high-temperature sealant is applied to the area of the removed outer surface of each bushing to ensure tightness between the polymer and metal, after which the surfaces of the bushings with the applied sealant are pressed inside each of the end sections of the sections of the metal-plastic pipeline is flush with the chamfers of the metal base, while from the outer side surface of the insulating pipe of each of the end sections of the metal-plastic pipeline sections of the plastic pipeline, a part of the insulating coating is removed, after which the end parts of the bushings and both parts of the metal base of the sections of the metal-plastic pipeline are welded.

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