RU204441U1 - HEAT INSULATING DIRECTION OF THE DRILLING WELL - Google Patents

Abstract

The utility model relates to devices used in the oil and gas industry and can be used to prevent thawing of boreholes in permafrost regions. The technical result of the claimed utility model consists in increasing the depth of installation of the thermal insulating direction of the borehole, reducing the time for installation and installation of the thermal insulating direction of the borehole and simplifying this process, reducing the negative load when the structure is run into the well, reducing the friction coefficient when lowering the thermal insulating direction, as well as in increasing the reliability of the structure and extending its service life. To achieve the specified technical result, a heat-insulating direction of the borehole is proposed, made collapsible, including two or more sections, while each section contains an outer and an inner pipe and has the ends of the inner pipe protruding from the outer pipe, the lower end of the inner pipe of the upper section is connected to the upper by the end of the inner pipe of the lower section by means of a joint, a heat-insulating material is placed between the outer and inner pipes of each section, and the cavity in the joint zone between the outer pipes of the sections is covered with heat-insulating shells equipped with a casing, characterized in that the connection of the lower end of the inner pipe of the upper section and the upper end of the inner the pipes of the lower section are welded.

Description

The utility model relates to devices used in the oil and gas industry and can be used to prevent thawing of boreholes in permafrost regions.

From the existing prior art, a thermal insulating direction is known, patent RU74415, published on June 27, 2008, containing an inner and outer pipes and a heat-insulating material placed between them, characterized in that the direction is collapsible from the upper and lower parts, in the joint zone of which the inner pipes protrude from the outer pipes and are equipped with interconnected flanges, the joint area is covered by a shell, while the cavity between the shell and the inner pipe is filled with heat-insulating material, and fasteners are made on the outer pipe of the lower part for temporary fixation of the ribs to support on the walls of the well during the installation of the direction.

The disadvantages of the known technical solution are the limitation of the depth of the descent of the heat-insulating direction, the high labor intensity of installation during the round-trip operations, as well as insufficient quality and uniform distribution of the heat-insulating material in the cavity to be filled.

As a prototype, consider the thermally insulating direction of a borehole with vacuum insulation, patent RU 158353, published on December 27, 2015, made collapsible from the upper and lower sections, each section of which contains an inner and an outer pipe with a heat-insulating material placed between them, in the section junction zone the inner pipes protrude from the outer pipes and are equipped with interconnected flanges, characterized in that it consists of two or more sections, each of which, in the joint zone, has the ends of the inner pipe protruding from the outer pipe, and the lower end of the inner pipe of the upper section is connected with the upper end of the inner pipe of the lower section by means of a flange connection, the cavity in the junction area of the upper and lower sections between the outer pipes and interconnected by means of a flange connection, the inner pipes of the upper and lower sections, is overlapped by at least two heat-insulating shells, which overlapped by a shell from the outside , and on the outer pipes of each of the lower sections, fasteners for temporary fixation of the ribs are installed to support the thermal insulating direction on the borehole walls during installation.

The disadvantages of the prototype are the insufficient reliability of the structure, a high level of load on the heat-insulating sections when running into the borehole, as well as the complexity of mounting the device during tripping operations.

The technical task of the claimed utility model is to eliminate the above disadvantages.

The technical result of the claimed utility model consists in increasing the depth of installation of the thermal insulating direction of the borehole, reducing the time for installation and installation of the thermal insulating direction of the borehole and simplifying this process, reducing the negative load when the structure is run into the well, reducing the friction coefficient when lowering the thermal insulating direction, as well as in increasing the reliability of the structure and extending its service life.

To achieve the specified technical result, a heat-insulating direction of the borehole is proposed, made collapsible, including two or more sections, while each section contains an outer and an inner pipe and has the ends of the inner pipe protruding from the outer pipe, the lower end of the inner pipe of the upper section is connected to the upper by the end of the inner pipe of the lower section by means of a joint, a heat-insulating material is placed between the outer and inner pipes of each section, and the cavity in the joint zone between the outer pipes of the sections is covered with heat-insulating shells equipped with a casing, characterized in that the connection of the lower end of the inner pipe of the upper section and the upper end of the inner the pipes of the lower section are welded.

The essence of the utility model is illustrated by figures.

FIG. 1 shows a view of thermal insulating sections of a borehole, where

1 - top section;

2 - lower section;

3 - outer tube of the upper section;

4 - outer pipe of the lower section;

5 - inner pipe of the upper section;

6 - inner pipe of the lower section;

7 - heat-insulating material;

8 - guides for temporary mounting supports;

9 - band ring;

10 - welded joint;

11 - insulating shells;

12 - protective casing.

The thermal insulating direction of the borehole includes two or more sections, with each section containing the outer (3, 4) and inner (5, 6) pipes. In the area where the upper (1) and lower (2) sections meet, the inner pipes protrude from the outer pipes. The lower end of the inner tube of the upper section is connected to the upper end of the inner tube of the lower section by means of a welded joint (10). Heat-insulating material (7) is placed between the outer and inner pipes of each section. The cavity in the junction zone of the upper and lower sections between the outer pipes and the inner pipes is covered with heat-insulating shells (11), which are covered from the outside by a protective casing (12). The outer pipes of the thermal insulating sections are also equipped with guides (8) for temporary mounting supports. Shroud rings (9) can be located on the outer surface of the outer pipe.

The heat-insulating direction of the borehole is used as follows: the heat-insulating direction of the borehole is made in the form of unified sections containing an inner guide and a protective outer pipe with a heat-insulating material placed between them. In the junction area of the two sections, the inner pipes are made protruding from the outer ones. Several sections of the borehole are assembled into one structure, while the protruding ends of the inner pipes of the two sections are interconnected by means of a welded joint. The cavity in the junction zone of two sections between the outer and inner pipes is covered with heat-insulating shells or joint insulation kits based on liquid polyurethane foams, which are covered from the outside with a protective casing. The outer pipe along the outer surface is provided with at least one shroud ring guiding the section when installed in the well.

The claimed set of features will ensure the achievement of the claimed technical result as follows: joining the sections with a welded seam simplifies the installation procedure for the thermal insulating direction of the borehole of the structure, which can significantly reduce the installation time of the structure and makes it possible to install the thermal insulating direction of the borehole to a greater depth. This design also reduces the negative load when running the thermal insulating direction into the well, which increases the strength of the structure and reduces the friction coefficient when running the device into the borehole, thereby increasing its service life.

No technical solutions have been identified that coincide with the set of essential features of the claimed utility model, which makes it possible to conclude that the claimed utility model meets the "novelty" condition of patentability.

Claims (2)

1. Thermal insulating direction of the borehole, made collapsible, including two or more sections, each section contains an outer and an inner pipe and has the ends of the inner pipe protruding from the outer pipe, the lower end of the inner pipe of the upper section is connected to the upper end of the inner pipe of the lower sections by means of a connection, a heat-insulating material is placed between the outer and inner pipes of each section, and the cavity in the joint zone between the outer pipes of the sections is covered with heat-insulating shells equipped with a casing, characterized in that the connection of the lower end of the inner pipe of the upper section and the upper end of the inner pipe of the lower section is made welded joint. 2. Thermal insulating direction according to claim 1, characterized in that a shroud ring is located on the outer surface of the outer pipe.

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