RU181279U1 - THERMAL INSULATING CASE - Google Patents

Abstract

The utility model relates to the oil and gas industry, in particular, used when drilling a well in permafrost areas to prevent its thawing and reduce the rate of formation of asphalt tar and paraffin deposits on the inner wall of tubing during paraffin oil production. The thermally insulating case contains an outer pipe (1) and an inner pipe (2) located therein with the formation of the annular space (3) in which the thermally insulating material is placed. The ends of the inner pipe (2) are made protruding beyond the annular space (3) and have connecting elements. Pipes (1,2) are connected to each other via two disks (4, 5) with central holes, each of which is connected by an outer edge to the corresponding end of the outer pipe (1), and by the wall of the central hole - with the outer surface of the inner pipe (2) . In the annular space (3) there is a cable (6) passing through additional openings made in the disks (4, 5). The cable (6) can be placed in a tube (7) located in the annulus (3) and connecting additional holes of the disks (4, 5). A cable, for example a heating cable, can be mounted in a spiral around the inner pipe (2). The technical result is to eliminate cable damage, ensuring stable operation of the rig. 5 cp f-ly, 2 ill.

Description

The utility model relates to the oil and gas industry, in particular, used when drilling a well in permafrost areas to prevent its thawing and reduce the rate of formation of asphalt tar and paraffin deposits on the inner wall of tubing during paraffin oil production.

Known two-layer heat-insulating pipe for use in regions of high and low temperatures, containing an inner pipe, an outer pipe remote from the specified inner pipe, sealing means forming a gas-tight cavity between the inner and outer pipes, the polyurethane foam contained in the specified cavity, the specified cavity also contains free gaseous fluorinated hydrocarbon at a pressure that increases without exceeding that at which it will condense in the operating range temperature (patent No. US4139024, IPC ЕВВ 36/00, publ. 13.02.1979).

A heat-insulating pipe is known comprising an inner pipe and an outer pipe to which end caps are soldered. Between the inner and outer pipes there is a thermal insulating layer. The inner pipe protrudes from the two ends of the outer pipe. A pipe is welded from one end of the outer pipe to create a vacuum in the annulus to improve thermal efficiency (patent No. CN 202325272, IPC E21B 36/00, published on July 11, 2012).

Known thermally insulating direction, containing the inner and outer pipes and placed between them insulating material. The direction is made 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 zone is covered by a shell, while the cavity between the shell and the inner pipe is filled with heat-insulating material, and on the outer pipe the bottom parts made of fasteners for temporary fixation of the ribs for support on the walls of the well during installation of the direction (patent No. RU 74415, IPC E21B 36/00, publ. June 27, 2008).

The closest set of essential features to the claimed technical solution is a thermally insulated pipe containing an inner pipe and an inner pipe located in it with the formation of the annular space and an insulating element located in the said space, the ends of the inner pipe protrude beyond the annular space, while the pipes are connected to each other by means of two disks, each of which is connected on one side to the corresponding end of the outer pipe, and on the other - from the outer with the inner pipe, clamps are additionally made at the ends of the outer pipes, the thermally insulated pipe additionally contains at least one layer of screen insulation placed in the annulus due to the absence of contact with the inner surface of the outer pipe and the outer surface of the inner, and in each of the disks around the perimeter of the hole made grooves filled with insulating material (patent No. RU 175996, IPC E21B 36/00, publ. 12/26/2017).

These designs do not ensure stable operation of the rig due to the possibility of damage to the cable through which information is transmitted to the control panel.

The objective of the proposed technical solution is to ensure stable operation of the rig.

The technical result consists in eliminating damage to the cable and is achieved due to the fact that in the thermally insulating case containing the outer pipe and located in it, the inner pipe with the formation of the annular space in which the thermally insulating material is placed, the ends of the inner pipe are made protruding outside the annular space and have connecting elements, pipes are connected to each other by means of two disks with central holes, each of which is connected by an outer edge with a corresponding torus the outer pipe, and the wall of the central hole with the outer surface of the inner pipe, in the annular space is a cable passing through additional holes made in the disks.

In the annulus can be located, connecting the additional holes of the disks, the tube in which the cable is placed, in the annulus can be located several cables or tubes under the cables, the cable, for example, heating, can be installed in a spiral around the inner pipe, additional holes of the disks can be aligned with each other.

Distinctive features, consisting in the fact that a cable is located in the annulus, passing through additional holes made in the disks, which eliminates any damage to the cable, which ensures the stability of the rig.

The features of the dependent claims are also aimed at ensuring the stability of the rig.

An analysis of the known technical solutions, carried out according to scientific, technical and patent documentation, showed that the set of essential features of the claimed technical solution is not known from the prior art, therefore, it meets the patentability condition of the utility model - “novelty”.

The utility model is illustrated by drawings:

FIG. 1 - a thermally insulating case with a cable located in a thermally insulating material, in a section;

FIG. 2 - a thermally insulating case with a cable located in the tube, in a section.

The thermally insulating case contains the outer and inner pipes 1 and 2. The pipes 1 and 2 are located coaxially with the formation of the annular space 3. The outer pipe 1 can be made of rolled welded sheets or of steel tape by spiral winding. The ends of the inner pipe 2 protrude beyond the annular space 3. The pipes 1 and 2 are connected to each other by two disks 4 and 5 with central holes, each of which is connected by the outer edge to the corresponding end of the outer pipe 1, and the wall of the central hole with the outer surface inner pipe 2, forming a closed cavity of the annular space 3. In the disk 5 there is a hole designed to fill the annular space 3 with a thermally insulating material, for example, polyurethane foam. The hole for filling the annulus 3 is closed by a plug (not shown in the drawing). The annular space 3 can be filled with mineral wool.

In the annular space 3 is a cable 6.

The disks 4 and 5 are made with additional holes that can be aligned with each other through which the cable 6 passes. There can be several additional holes in the disks 4 and 5 and, accordingly, several cables 6 for various purposes can be located in the annulus, for example, for transmitting information from sensors to the control panel of the drilling rig and the heating cable to force maintain the required temperature in the tubing if necessary.

The cable 6 can be placed directly in the thermally insulating material of the annular space 3 or in the tube 7 located in the annular space 3 and connecting additional holes of the disks 4 and 5.

When placed directly in the insulating material, the heating cable can be mounted in a spiral around the inner pipe 2.

The ends of the inner pipe 2 are made with connecting elements designed to connect thermally insulating cases into the column. The connecting elements can be made in the form of flanges 8, which are connected to each other by bolts, or the ends of the inner pipe 2 are threaded and connected by a threaded sleeve.

The outer pipe 1 may be provided with elements (for example, loops) (not shown in the drawing) for hooking it using lifting mechanisms, providing ease of installation.

The inventive thermally insulating case allows for stable operation of the drilling rig.

The inventive thermally insulating case is made on standard technological equipment using modern materials and technologies.

Claims (6)

1. A thermally insulating case containing an outer pipe and an inner pipe located inside it to form an annular space in which a thermally insulating material is placed, the ends of the inner pipe are made protruding outside the annular space and have connecting elements, the pipes are connected to each other via two disks with central holes , each of which is connected by the outer edge with the corresponding end face of the outer pipe, and the wall of the central hole with the outer surface of the inner pipe, characterized in that in the annulus there is a cable passing through additional holes made in the disks. 2. Thermal insulating case according to claim 1, characterized in that in the annular space there is a tube connecting the additional holes of the disks. 3. Thermal insulating case according to paragraphs. 1 and 2, characterized in that the cable is placed in the tube. 4. Thermal insulating case according to paragraphs. 1 and 2, characterized in that in the annulus there are several cables. 5. Thermal insulating case according to paragraphs. 1 and 2, characterized in that the cable, for example heating, can be installed in a spiral around the inner pipe. 6. Thermal insulating case according to claim 1, characterized in that the additional holes of the disks are aligned with each other.

Images