RU2655263C1 - Thermal insulated column - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular for the production of oil or gas in areas with permafrost, and can be used in other industries in the pipe insulation for the transportation of coolants. Thermal insulated column includes coaxially located outer and inner pipes with thermal insulation between them and couplings. Wherein an outer tube is installed with the possibility of compensation of linear extensions. In this case, the thermal insulated column is configured to control the heat flows within the well. In an annular space of the outer and inner tubes, thermoelectric elements are installed, wound with a wire or tape to fix them with respect to an inner tube. Ends of the inner and outer tubes are offset relative to each other and are connected by means of an adapter which is provided with a cable connector for supplying the thermoelectric elements and is connected by an external screw joint to a coupling. End of the inner tube protruding above the end of the outer tube and the end portion of the outer tube are joined by an adapter via a detachable connection.

EFFECT: expansion of the arsenal of technical means, increasing the efficiency of thermal insulation of wells and expanding the functionality through the management of heat flow and its reduction in the annular space of the well, to prevent thawing of permafrost, or, if necessary, heating the annular space of the well.

3 cl, 5 dwg

Description

The invention relates to the oil and gas industry, in particular for oil or gas production in areas with permafrost, and can be used in other industries for pipe insulation for transporting coolants.

There is a known insulating direction used when drilling a well in permafrost areas to prevent its thawing, consisting of collapsible sections containing internal and external coaxial pipes, the annulus between which is filled with heat-insulating material (RF Patent No. 158353 U1, priority date September 28, 2015 , publication date 12/27/2015, authors: Zhilin A.S. et al., RU).

A disadvantage of the well-known heat-insulating direction of the well is the low efficiency of its use in the summer period due to the likelihood of thawing of the near-pile space due to the inability to control the heat flow in the well-permafrost system.

Known tubing with vacuum thermal insulation, containing inner and outer pipes, coaxially connected to each other at the ends by a vacuum-tight seam with the formation of an annular annular gap, while a gap is created in the gap and insulation is located, where the ends of the inner pipe are formed with a conical the bell in contact with the corresponding ends of the outer pipe, the insulation is made in the form of a screen with a reflective surface located with a gap between the walls of the inner and outer pipes, and a hole is made in the wall of the outer pipe into which a plug containing a barometric sensor is screwed (RF Patent No. 123822 U1, priority date September 18, 2012, publication date January 10, 2013, authors: Zaryaev I.A. et al., RU).

The disadvantage of this analogue is the use of vacuum thermal insulation, which in case of depressurization will not be able to reduce the heat flux of the well.

A heat exchanger tube is known containing fins in the form of a wire spring wound in a spiral, moreover, the fins are located on the outer and inner surfaces of the pipe, the fins on the inner surface of the pipe are made of a spiral located on the frame (RF Patent No. 2200925 C1, priority date 15.03.2000, publication date 03/20/2003, author Mityukhin F.P., UA).

This device is intended for use in heat exchangers in the energy sector and does not allow controlling heat flows in the well.

The closest in technical essence is a thermally insulated column, which includes an integral pipe with upset profiled ends, an outer pipe, which is 9-12 mm compressed along the axis before installation, has a taper-resistant thread at the ends and is equipped with a seat and a valve on multilayer screen insulation centering rings are placed, a getter is placed between the layers of multilayer screen insulation, a vacuum is created in the annulus, while the sleeve is screwed onto the outer pipes, and the sealing sleeve is supplied on the groove and presses the profiled ends of the inner pipe to the outer pipe (RF Patent No. 2129202 C1, priority date 08/12/1997, publication date 04/20/1999, authors Kudinov V.I., Bogomolny E.I. et al., RU, prototype) .

The disadvantage of the prototype is the use of vacuum thermal insulation, which in case of depressurization will not be able to reduce the heat flux of the well, and the inability to control the heat flux in the annulus of the well.

The technical problem of the invention is to increase the efficiency of thermal insulation of wells to prevent thawing of permafrost, including the summer period, by controlling the heat flux and reducing it in the annulus of the well, and if necessary, heating its annulus, since permafrost is often freezing, which leads to to crushing casing strings.

To solve a technical problem, a thermally insulated column was proposed, including coaxially located outer and inner pipes with thermal insulation between them and couplings, the outer pipe being installed with the possibility of compensating linear extensions. According to the invention, it is new that a thermally insulated column is configured to control heat fluxes inside the well, while thermoelectric elements are installed in the annulus of the outer and inner pipes, wrapped with wire or tape to fix them relative to the inner pipe, the ends of the inner and outer pipes are offset relative to each other each other and connected using an adapter that is equipped with a cable connector for powering thermoelectric elements and is connected to an external threaded of the connections with a clutch, the end of the inner tube projecting above the end of the outer tube and the end portion of the outer pipe adapter are united by means of a releasable connection.

According to the invention, the outer pipe is made in the form of wire or tape winding from a heat-conducting material.

According to the invention, the outer pipe is made of sections of heat-conducting pipes with a compensator for linear expansion between them, and centering rings are installed in the annular space of the outer and inner pipes.

The invention is illustrated by drawings. In FIG. 1 schematically shows a thermally insulated column, where the outer pipe is made in the form of a wire or tape winding from a heat-conducting material; in FIG. 2 is a section AA in FIG. 1, where thermoelectric elements are presented; in FIG. 3 is a section BB in FIG. 1, where the adapter cable connector is displayed; Fig. 4 shows a thermally insulated column in which the outer pipe is made of sections of heat-conducting pipes with a compensator for linear expansion between them; in FIG. 5 - remote element A in FIG. 4, where the placement of a metal wire or tape for fixing the thermoelectric element relative to the inner pipe is indicated.

The heat-insulated column depicted in fit 1 contains an inner pipe 1 and an outer pipe 2 coaxially located with respect to it in the form of a wire or tape winding of a heat-conducting material, such as aluminum. An annulus is formed between the inner and outer pipes, in which the heat-insulating material 3 with low thermal conductivity is located, for example, in the form of a polyurethane shell, and thermoelectric elements 4 with wires 5 for supplying electrical power are installed (Fig. 2). As thermoelectric elements can be used, for example, Peltier elements (http://www.chipdip.ru/catalog-show/thermoelectric-modules/, viewing date 04/05/2017). The ends of the inner 1 and outer 2 pipes are offset relative to each other and connected using an adapter 6, which is equipped with a cable connector 7 for supplying thermoelectric elements 4 via wires 5 (Fig. 3) and threaded joints at the upper end for mounting the coupling 8. The end the inner pipe protruding above the end of the outer pipe and the end of the outer pipe are connected by an adapter 6 by means of a detachable connection, the inner pipe 1 being connected to the adapter using, for example, a threaded connection, and the outer pipe 2 is connected Inena with a tight fit.

The heat insulated well flow control column shown in FIG. 1, is manufactured and operates as follows.

The height of the thermoelectric elements 4 with wires 5 and the heat-insulating material 3 in the form of polyurethane shells are installed on the inner pipe 1, then a wire or tape is lapped onto them with an overlap of heat-conducting material that forms the outer pipe 2. The outer pipe from wire or tape winding 2 acts as a casing , compensator for linear extensions and fixes thermoelectric elements 4 relative to the inner pipe 1. Next, to the upper end of the inner pipe 1 by means of a screw connection aetsya adapter 6 which is screwed on the outer end of the outer tube 2 from a wire or tape without gaps therebetween, forming an interference fit. After that, the cable connector 7 is connected to the wires 5 of the thermoelectric elements 4.

In the process, through the cable connector 7 through wires 5 to the thermoelectric elements 4 is supplied the necessary value of electric current and voltage to control the heat flow in the annulus of the well. Thermoelectric elements 4 cool the surface of the outer pipe 2 and heat the inner pipe 1.

The example implementation of the invention is the easiest to manufacture, economical and therefore most preferred.

The insulated column shown in FIG. 4 is also an example of a possible implementation of the invention. The specified insulated column contains an inner pipe 1 and an outer pipe 2 of sections of heat-conducting pipes with linear expansion joints 9 installed between them, for example, in the form of a corrugated diaphragm with a filler 10. In the annular space of the outer and inner pipes, thermal insulation 3 is installed and thermoelectric elements are installed in height 4 with wires 5 for supplying electrical power, wrapped with a thin metal wire or tape 11 for hard fixing them relative to the inner pipe 1, and centering rings 12 are installed to ensure an exact fit of the outer pipe relative to the inner one and can be made of plastic. The ends of the inner 1 and outer 2 pipes, as in the first example, are offset relative to each other and connected using an adapter 6, which is equipped with a cable connector 7 for supplying thermoelectric elements 4 via wires 5 and threaded joints at the upper end for mounting the coupling 8. When the end of the inner pipe protruding above the end of the outer pipe and the end of the outer pipe are connected by an adapter 6 by means of a detachable connection, for example a threaded connection or an interference fit.

The heat insulated well flow control column shown in FIG. 4, is manufactured and operates as follows.

An adapter 6 with a cable connector 7 is screwed onto the lower end of the inner pipe 1 by means of a threaded connection. Next, a section of heat-insulating material is installed on the inner pipe 1 with wires 5 and a section of the outer pipe 2 is screwed by a threaded connection, and screwed onto the other end using a detachable connection. for example, threaded connections, linear expansion joints 9. The annular space between the linear expansion joints and the inner pipe is filled with filler 10, for example heat insulating foam. Next, centering rings 12, heat-insulating material 3, thermoelectric elements 4 with wires 5 are installed in height along the height of the inner pipe by sequential alternation. Thermoelectric elements are fixed relative to the inner pipe using a thin wire or tape 11, for example aluminum (Fig. 5). Next, the outer pipe section 2 is mounted and connected to the linear expansion joint 9 by means of a detachable connection, so that the centering rings 12, heat-insulating material 3, thermoelectric elements 4 with wires 5 are located in the annular space. Thus, a thermally insulated column of the required height is assembled. At the end of the assembly, an adapter 6 with a cable connector 7 is screwed onto the top of the end of the inner pipe by means of a threaded connection. insulated columns on the threaded connection of the adapters 6 mounted couplings 8.

In the process, through the cable connector 7 through wires 5 to the thermoelectric elements 4 is supplied the necessary value of electric current and voltage to control the heat flow in the annulus of the well. Thermoelectric elements 4 cool the surface of the outer pipe 2 and heat the inner pipe 1.

If necessary, in both examples, changing the direction of supply of electric current and voltage to thermoelectric elements, it is possible to adjust the modes of heating and cooling of the annulus of the well.

A heat-insulated column for controlling heat fluxes inside the well can be mounted on existing and under construction wells in areas with permafrost, which will prevent their thawing and increase the life of the wells.

The technical result achieved by the invention consists in expanding the arsenal of technical means, in increasing the efficiency of thermal insulation of wells and in expanding functional capabilities by controlling the heat flow and reducing it in the annulus of the well, to prevent thawing of permafrost rock, or, if necessary, heating the annulus of the well.

Claims (3)

1. The insulated column, including coaxially located outer and inner pipes with heat insulation between them and the coupling, the outer pipe is installed with the ability to compensate for linear expansion, characterized in that the insulated column is made with the possibility of controlling heat fluxes inside the well, while in the annulus thermoelectric elements are installed on the inner pipe, wrapped with wire or tape to fix them relative to the inner pipe, the ends of the inner and the outer pipes are offset relative to each other and connected using an adapter, which is equipped with a cable connector for powering thermoelectric elements and is connected by an external threaded connection to the sleeve, while the end of the inner pipe protruding above the end of the outer pipe and the end part of the outer pipe are connected by an adapter connections. 2. The heat-insulating column according to claim 1, characterized in that the outer pipe is made in the form of a wire or tape winding of heat-conducting material. 3. The heat-insulating column according to claim 1, characterized in that the outer pipe is made of sections of heat-conducting pipes with a compensator for linear expansion between them, and centering rings are installed in the annulus of the outer and inner pipes.

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