WO2011023311A2

WO2011023311A2 - Transport and storage unit

Info

Publication number: WO2011023311A2
Application number: PCT/EP2010/005008
Authority: WO
Inventors: Guido Kania; Volker Liebel; Mario Psyk; Jörg STOSCHUS; Daniel Gottschalk; Frank Lünstedt; Alexander Oelschlegel; Karlheinz Winter
Original assignee: Rehau Ag + Co
Priority date: 2009-08-24
Filing date: 2010-08-14
Publication date: 2011-03-03
Also published as: WO2011023311A3; EP2470840A2; DE202009011393U1

Abstract

The present invention relates to a transport and storage unit for a geothermal probe tube assembly (1), comprising a geothermal probe tube assembly (1) for utilizing near-surface geothermal energy. The geothermal probe tube assembly comprises a tube (2), which is made of a polymeric material and has a helical or spiral design at least in some regions, and a layer enclosing a lumen (4). The invention further relates to a transport packaging (3), which surrounds the geothermal probe tube assembly (1) in a helically or spirally designed region of the tube (2), wherein the polymeric material is a cross-linked polymeric material, and wherein the transport packaging (3) holds the geothermal probe tube assembly (1) under axial bias in a first, contracted state, in which the geothermal probe tube assembly (1) occupies a smaller volume than it does in a second, expanded state, in which the transport packaging (3) is no longer present.

Description

Transport and storage unit

The present invention relates to a transport and storage unit comprising a geothermal probe tube assembly for utilizing near-surface geothermal energy with a tube made of polymeric material that is at least partially helical or helical in shape and having a lumen-surrounding layer, and a transport tube. Pack includes, wherein the transport packaging surrounds the geothermal probe tube assembly in a helical or spiral-shaped region of the tube.

Helix or spiral geothermal probe pipe arrangements have the task to absorb heat from the ground or to deliver it to the ground. For this purpose, the geothermal probes constructed from such geothermal probe pipe arrangements are introduced into a borehole and poured out the gap between the probe and the bore wall, wherein the pouring material after curing provides for a permanent and statically stable connection between the geothermal probe and the ground surrounding the geothermal probe soil. In addition, the hardened spout material ensures energy transfer between the heat transfer medium in the geothermal probe and the soil. After introducing the geothermal probe into the borehole and the pouring of the borehole, such geothermal probes in the ground function as tubular heat exchangers, wherein a heat transfer medium flowing through the geothermal probe is used for heat transport.

Such helical or spiral geothermal probe tube assemblies are known in the art. For example, EP 1 006 331 A1 proposes winding a plastic pipe for guiding the heat transfer medium helically around a core of a wire mesh in many windings and inserting the resulting helically wound plastic pipe with the wire mesh into a borehole, which is then filled with the excavated material becomes. The Erdwärmesonden- tube assembly described in EP 1 006 331 A1 disadvantageously represents a significant transport volume and transport weight due to the wire mesh core with the plastic tube wound around it. To overcome this transport problem, US 5,054,541 describes a spiral geothermal probe tube assembly in which the individual windings are connected by drawstrings, wherein the drawstrings are distributed over the circumference of the turns of the geothermal probe tube and attached to the individual windings, so that the Thus formed Zugbandabschnitte between turns each determine the axial distance between the individual turns. The diameter of the helical turns decreases in the laying direction, so that the individual turns of the probe tube form a truncated cone, which occupies a reduced transport volume in the collapsed state during transport. Before introducing the borehole heat exchanger into the well, the ends of the drawbars are raised, whereby the geothermal probe tube assembly is pulled apart in the axial direction and can be performed in the extended state in the bore. However, such a geothermal probe is associated with a high production cost, because the turns of the pipe assembly must be individually connected to the drawstrings. Moreover, with such a geothermal probe tube assembly prior to insertion of the probe into the ground hole, deformation of the conductor turns may occur because the drawstrings do not provide effective protection against deformation of the tube assembly. In order to reduce the risk of deformation of the tube assembly prior to insertion into the wellbore, AT 503 583 A4 describes a ground collector having a conduit for a heat transfer medium, which is insertable into a bore, forming a plurality of helical turns, and having the mutual axial spacing of the turns of the conduit limiting, flexible casing, which encloses the turns of the line under radial preload. However, such probes have the disadvantage that the outer soft bend sheath the laying conditions on the site often can not withstand, so that it is damaged or torn in many cases during the laying of the ground collector. If such an outer flexible soft shell is lacking, such ground collectors can no longer be brought into the borehole since they are easily out of shape. In addition, often occurs a displacement of the individual winding layers of the ground collector under the bendable sheath on both the transport in the collapsed state and when removing the probe immediately prior to installation, which can lead to uneven heat extraction performance of the geothermal collector. Furthermore, a bending soft shell surrounding the geothermal collector obstructs the heat transfer between the soil and the geothermal collector. Proceeding from this, the present invention is based on the object of providing a transport and storage unit for such a geothermal probe pipe arrangement which overcomes the disadvantages of the prior art. In particular, a transport and storage unit is to be made available through which the geothermal probe tube assembly can be safely transported and stored in a small volume and is ensured by a simple and safe installation of the geothermal probe under harsh conditions on the site. In addition, a high and uniform heat extraction capacity of the geothermal probe is to be achieved.

According to the present invention, it has been found that this object is achieved in that the geothermal probe tube assembly is held in a transport and storage unit by a transport package under axial bias in a smaller volume than after removal of the transport packaging, wherein a tube of geothermal Probe tube assembly is made of cross-linked polymeric material. Accordingly, the objects underlying the present invention are achieved by a transport and storage unit for a geothermal probe having the features of claim 1. Preferred embodiments of the transport and storage unit according to the invention for a geothermal probe tube assembly are described in the dependent therefrom Speaks.

The present invention thus relates to a transport and storage unit for a geothermal probe tube assembly comprising a geothermal probe tube assembly for utilizing near-surface geothermal energy with a tube made of polymeric material that is at least partially helical or spiral shaped and a layer surrounding a lumen and a transport packaging enclosing the borehole heat exchanger tube assembly in a helical or helical region of the tube, wherein the polymeric material is a cross-linked polymeric material, and wherein the transport package biases the borehole heat exchanger tube assembly under axial bias in a first contracted condition holds, in which the geothermal probe tube assembly occupies a smaller volume than in a second, expanded state in the transport packaging is no longer available.

It may be advantageous if the transport packaging comprises at least one holding element which consists of films, cords, ropes, tapes, adhesive tapes and combinations thereof. off, is selected. The use of such holding elements ensures that the geothermal probe is kept in the packaged state targeted in a smaller volume and that the individual turns of the helical or spiral portion of the geothermal probe can not move against each other. It has been found in practice to be particularly favorable when transport packaging is a transport foil packaging.

It may prove to be advantageous if the polymeric material of the tube is a crosslinked polyolefin, with crosslinked polyethylene (PE-X) being preferred. The cross-linked polyethylene can be peroxide-crosslinked polyethylene (PE-Xa), silane-crosslinked polyethylene (PE-Xb), electron-beam cross-linked polyethylene (PE-Xc), azoveretworked polyethylene (PE-Xd) and mixed variants of these cross-linked polyethylenes act, with peroxide-crosslinked polyethylene is particularly preferred. Such materials exhibit high point load resistance and stress cracking resistance and are therefore suitable for installation under difficult conditions. In addition, such materials are able to ensure dimensional stability of the helical or helical portion of the tube, so that displacement of the tube turns against each other or deformation of the conductor coils can be effectively prevented. Furthermore, it may prove useful if in the polymeric material of the tube thermally conductive particles in an amount of 1 wt .-% to 40 wt .-%, based on the weight of the polymeric material, are included. Based on the weight of the polymeric material of the tube, it is preferred that in the polymeric material 10 wt .-% to 30 wt .-% of thermally conductive particles, particularly preferably 18 wt .-% to 22 wt .-% heat-conductive particles are. The presence of such thermally conductive particles in the polymeric material promotes heat transfer between the soil and the heat transfer medium in the tube of the geothermal probe tube assembly. Graphite, mica, wollastonite, talc, chalk, glass fibers, metals and mixtures of these materials have proven particularly advantageous as heat-conductive particles.

It may also prove advantageous if the tube has an oval cross section at least in sections, the oval cross section preferably having an ovality in the range of 1% to 45%, particularly preferably an ovality in the range of 10% to 30%. Such an oval cross section of the tube causes an increase in the ratio of the surface of the tube to its free cross-sectional area, whereby an improvement of the heat absorption or heat dissipation from the flowing heat transfer medium to the soil takes place. Such an improvement of the heat transfer between heat transfer medium and soil can also be effected by internals and / or internal grooves are provided on the inside of the tube. Such internals and internal grooves can be used in addition to the ovalization of the pipe cross-section or find use as the only measures in round pipe cross-section. Such measures also increase the turbulence of the flow of the heat transfer medium in the tube and thereby cause an improved heat absorption or heat dissipation through the heat transfer medium flowing through the tube.

It can also prove to be advantageous if drawers are present at at least one point along the circumference of the helical or spiral part of the tube. In this case, it can be of particular use if the pulling devices are present at two locations along the circumference of the helical or spiral part of the tube, in particular at two opposite points along the circumference of the helical or spiral part of the tube. Such traction devices are able to prevent a shift of the individual winding layers of the tube of the geothermal probe tube assembly under the transport packaging and on the other hand to allow uniform extraction of the geothermal probe tube assembly after removal of the transport packaging. It may prove to be particularly advantageous when it comes to the drawbars to drawstrings.

In this context, it may be useful if the drawstrings on their side facing the tube have a layer of thermoplastic material, which is materially connected to the polymeric material of the tube. In this way, a difficult detachable connection between the drawstrings and the tube is created. It may also prove to be beneficial if the drawstrings comprise an adhesive layer and a tension-resistant carrier layer. It may prove to be particularly advantageous if the carrier layer is reinforced by longitudinally inserted fibrous reinforcing threads or rovings and / or stretched polymer material to increase the tensile strength, preferably stretched polyethylene or polypropylene comprises and / or polyethylene terephthalate as a tensile polymer material. Such a structure causes a mechanical stability of the drawstrings and allows a cohesive connection between the drawstrings and the polymeric material of the tube. Furthermore, it may be useful if the drawbars equidistant distances of the helix of the helical or spiral part of the pipe or predetermine with the laying depth decreasing distances of the helix of the helical or spiral portion of the tube. Equidistant spacings of the helix with the laying depth ensure uniform introduction of the geothermal probe tube arrangement into the ground. In contrast, with the laying depth decreasing distances of the helix of the helical or spiral part of the tube ensure smaller installation distances of the pipe in deeper areas of the soil, in which there are higher temperatures than in the nearer areas of the soil, especially in the cold winter months. The lower installation distances in the warmer areas of the soil, the heat extraction capacity of the probe tube can be increased and thus more energy can be obtained.

Furthermore, it may also prove advantageous if a device for compensating buoyancy forces is present on the pipe of the geothermal probe pipe arrangement in the introduced into a wellbore state in the vicinity of the earth's surface farthest point of the tube and / or the traction devices. Due to the presence of such a device for compensating buoyancy forces laying of the geothermal probe tube assembly according to the invention used in groundwater is possible, whereby a very good heat transfer to the flowing in the tube heat transfer medium is made possible. It can also prove to be advantageous if there is a device for receiving a spreading means on the tube in the state introduced into the borehole near the point furthest away from the earth's surface. If a spreader at this point connected to the pipe of the geothermal probe Rohranord- tion, the extraction of the helical or spiral portion of the tube can be easily performed. In addition, the introduced spreading can be used to anchor the geothermal probe tube assembly according to the invention in the extended state in a wellbore. The device for compensating buoyancy forces and the device for receiving a spreading means may be present individually or simultaneously on the pipe and / or on the pulling devices.

It may also prove advantageous if the polymeric material of the tube comprises at least one layer which is composed of a polymeric material whose FNCT (Füll Notched Creep Test) according to ISO 16770 under the conditions 80 ⁰ C, 4 N / mm ² , 2% Arcopal N-100 is at least 8,760 h. Through the use of With such a high FNCT of 8,760 h and above, slow crack growth in the pipes can be effectively prevented, and such pipes are resistant to point loads that can be applied to the respective pipes when the material is used to fill the well after the geothermal probes have been installed - Pipe assembly is not completely stone free. When using such punktrissbeständiger pipes thus stone-containing filling material can be used.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Brief description of the figures

Fig. 1 shows a schematic sectional view of a transport and storage unit according to the invention in the compressed state.

Fig. 2 shows a sectional view of the invention shown in FIG

Transport and storage unit used geothermal probe tube assembly after removal of the transport packaging in the expanded state. Fig. 3 shows an enlarged section of the geothermal probe tube assembly shown in Fig. 2 in cross section.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an embodiment of a transport and storage unit according to the invention is shown in cross-section. The illustrated transport and storage unit comprises a borehole heat exchanger tube arrangement 1 with a tube 2 made of polymeric material, which is helical with the exception of one inlet 8 and one outlet 9, the helically shaped area of the tube 2 being surrounded by a transport packaging 3 which is formed in the illustrated embodiment of the present invention as a transport foil packaging. As a result, the helically formed region of the tube 2 is held under axial prestress in a first, contracted state. The tube 2 of the geothermal probe tube assembly 1 is made of peroxide-crosslinked polyethylene (PE-Xa) and has a layer surrounding a lumen 4 (FIG. 3). In alternative embodiments of the present invention, the tube 2 may also be prepared from another crosslinked polymeric material, in particular a crosslinked polyolefin and preferably from another crosslinked polyethylene (PE-X). To increase the heat transfer, thermally conductive graphite particles are added to the polymeric material in an amount of 20% by weight, based on the weight of the polymeric material. As an alternative or in addition to the thermally conductive graphite particles, in addition to these particles, mica particles, talc particles, chalk particles, glass fiber particles, metal particles and mixed particles of these materials may also be contained in the polymeric material of the pipe 2. Such thermally conductive particles may be contained individually or as a mixture of such particles in the polymeric material of the tube 2.

The tube 2 of the geothermal probe tube assembly 1 has an inlet 8, a helically shaped region and a drain 9. In the embodiment of the present invention shown in FIG. 1, the helically formed region is present as a catchy He-Hx. At this catchy helix is followed by an approximately linear out of the helically shaped region leading out 9 of the tube 2 at. In alternative embodiments, the helically and / or spirally formed region of the tube 2 may also be a double-helical region, wherein a deflection of 180 ° is required at the lower end. In other embodiments of the present invention may also be a catchy, combined helix and spiral region or a double-flight, combined helix and spiral region with a deflection by 180 ° or even a purely helically formed region in a catchy or double-flighted configuration, wherein in the embodiment with zweigängigem helical and / or spiral-shaped region at the lower end of the tube 2 in each case a deflection of the tube 2 by 180 ° is required. In the case of tubes 2 with a double-helical and / or helical region, the outlet 9 adjoins the upper end of the region, while in the case of tubes 2 with a helical and / or helical region, the essentially linearly formed outlet adjoins the region lower end of the helical and / or spiral-shaped area connects. Fig. 2 shows the geothermal probe tube assembly 1 shown in Fig. 1 after removing the transport packaging 3, wherein the geothermal probe tube assembly 1 when it is no longer held by the transport packaging 3 in a first contracted state, due to the transport packaging through the third has been bypassed in her stored spring energy in a second, expanded state in which the geothermal probe tube assembly 1 occupies a larger volume than in the first, contracted supply stood, in which the transport packaging 3 surrounds the helical region of the tube 2.

This expansion of the helical or spiral-shaped region of the tube 2 is due to the stored spring energy without further external action. This can additionally be promoted by a mechanical extension of the helical and / or spiral region.

At the helically formed region of the tube 2, pulling devices 5 in the form of drawstrings are attached at two opposite points along the circumference of the helix. However, it is also sufficient if such pulling devices 5 are mounted at a location along the circumference of the helix. In addition, such drawers 5 may also be present at more than two locations along the circumference of the helical and / or spiral part of the tube 2, it being preferred that the locations along the circumference at which the drawers 5 are present, a occupy the greatest possible distance from each other. For example, if such pulling devices 5 are present at three locations along the circumference of the tube 2, it is preferred that these points be offset by about 120 ° along the circumference of the helically and / or spirally formed region of the tube 2.

In the embodiment of the present invention shown in the figures, the pulling devices 5 are designed as drawstrings. It is particularly preferred if the drawstrings have on their side facing the tube 2 a layer of thermoplastic material which forms a coherent connection with the crosslinked polymeric material of the tube 2.

The connections between the drawbars 5 and the tube 2 can easily be made such that the helix of the helical and / or helical region of the tube 2 has equidistant spacings. This is ensured by the fact that adjacent sections of the pulling device 5, which are separated only by the tube 2 in the helically formed region, have the same length. It is preferred, however, that distances of the helix and / or helical region of the tube 2 are predetermined by the pulling devices, which decrease with increasing laying depth of the geothermal probe pipe application. This is achieved by the fact that adjacent, separated only by the tube 2 in the helically shaped area Sections of the traction device 5 have a decreasing length with increasing laying depth. Since the temperature increases in the ground with increasing distance from the earth's surface, especially in the cold winter months, ensures that in the zones higher ground temperature lower Verleg eabstände the tube 2 of the geothermal probe tube assembly 1 are present, resulting in a higher extraction performance, so that through the geothermal probe tube assembly more heat energy can be obtained.

The pulling devices 5 are preferably designed as drawstrings which comprise an adhesive layer 6 and a tension-resistant carrier layer 7. The adhesive layer 6 is preferably a layer of a low-melting adhesive, a bonding agent and / or a contact adhesive, which forms a cohesive connection with the outside of the tube 2. The tension-resistant carrier layer 7 is preferably reinforced by longitudinally inserted fibrous reinforcing threads and / or rowings. As an alternative or in addition to this, the tension-resistant carrier layer 7 may preferably comprise drawn polymer material to increase the tensile strength, in particular drawn polyethylene, stretched polypropylene, copolymers and / or blends of these polyolefins being used. In particularly preferred embodiments, the carrier layer 7 comprises polyethylene terephthalate (PET) as a tensile polymer material. The measures mentioned for increasing the tensile strength of the carrier layer 7 can be applied both alone and in combination.

In preferred embodiments of the present invention, a luminophore is incorporated into the material of the geothermal probe tube assembly 1 and / or the towing devices 5. In this way it is ensured that the geothermal probe luminesces when inserted into the wellbore and thus the introduction of the probe is greatly simplified in the dark hole because of the optical visibility of the current position of the probe. Alternatively, an optical detectability of the insertion position of the probe into the soil can also be achieved by incorporating a thermochromic coloring pigment into the polymeric material of the tube 2. In this way, the outer wall of the tube 2 at different temperatures, ie at different laying depth of the tube, a different color, so that the actual installation depth of the probe can be detected optically. In preferred embodiments, the geothermal probe tube assembly has a device for compensating buoyancy forces near the furthest point of the tube 2 to the earth's surface. This is preferably a weight, in particular a metal weight (for example stainless steel), which is fastened to the pipe, for example by screwing. Alternatively, the device for compensating buoyancy forces may also be present in the vicinity of the furthest point of the traction device 5 to the earth's surface. The presence of a device for the compensation of buoyancy forces allows a laying of the geothermal probe in the groundwater and can thereby contribute to improved heat transfer to flowing through the pipe 2 heat transfer medium. Moreover, it is preferable, alternatively or in addition to the device for compensating buoyancy forces, to attach a device for receiving a spreading means. The presence of a spreader at the furthest point of the probe on the surface of the earth allows anchoring of the probe in the ground and thus a simplified process during the pouring of the borehole into which the geothermal probe is inserted.

With regard to the polymeric material of the tube, it is particularly preferred if the polymeric material of the tube 2 comprises at least one layer which is made of a polymeric material, the FNCT (fill notched creep test) according to ISO 16770 under the test conditions 80 ⁰ C, 4 N / mm ² , 2% Arkopal N-100 at least 8,760 hours. This advantageous embodiment of the geothermal probe tube assembly 1 used according to the invention, an increased point load resistance of the tube 2 and in continuous operation a significantly reduced growth of grooves and notches is achieved. In addition, by using materials with a high FNCT value, a permanent safety of the pipes for the geothermal probe when using correspondingly high flow temperatures (for example, up to about 40 ⁰ C) ensures the heat transfer medium.

Fig. 3 shows in cross section an enlarged section of the geothermal probe tube assembly shown in Fig. 2 1. The tube 2 of the geothermal probe tube assembly encloses a lumen 4, which is traversed by the heat transfer medium. In this case, the tube 2 in the helically formed region has an oval cross-section. By such an oval cross section of the tube 2, the ratio of the surface of the tube is increased to its through-flow from the heat transfer medium cross-sectional area, whereby the heat transfer between soil and heat transfer medium is improved. In this case, the oval cross section is constant over the entire helically shaped region of the tube 2. In alternative embodiments, the ovality of the cross section of the tube in the helical and / or helical region can also be made variable. By such a variable cross-section of the tube 2, the flow behavior of the heat transfer medium through the tube 2 is shifted from the laminar nature of the flow to a more turbulent character of the flow. By a turbulent flow of the heat transfer medium in the tube 2 is an improved heat absorption or heat dissipation through the pipe 2 flowing through the heat transfer medium. To further increase the turbulent nature of the flow of the heat transfer medium, internals may be provided on the side of the tube 2 facing the lumen 4. In such internals may be internal grooves, elevations, built-in tips, pedestal or the like, which prevent laminar flow of the heat transfer medium. In order to ensure easy connectability of the tube 2 of the geothermal probe tube assembly 1, takes place in the region of the inlet 8 and / or the outlet 9, a direct or sliding transition from an oval cross section of the tube 2 to a circular cross section. In this case, the diameter of the circular tube cross-section of the inlet 8 and the outlet 9 is preferably designed so that a connectivity is given to standardized connection masses. In particular in the case of circular pipe cross-sections, it is preferred that, in order to avoid confusion between inlet 8 and outlet 9, a coding, preferably a color and / or graphic coding, is present during the startup. In alternative embodiments, the tube 2 has a circular cross section over its entire length. In this case, the cross section may be constant or in particular have a variable cross section in the helically and / or spirally formed region of the tube 2. Even with circular cross-sections of the tube 2 in the helical and / or spiral-shaped area, the diameter of the circular pipe cross-section of the inlet 8 and the outlet 9 is preferably designed so that a connectability to standardized connection masses is given, wherein to avoid confusion Feed 8 and 9 sequence when commissioning preferably a coding, preferably a color and / or graphic coding can be present.

- Claims

Claims

claims

1. Transport and storage unit for a geothermal probe pipe assembly (1) comprising a geothermal probe pipe assembly (1) for use near-surface geothermal with a made of polymeric material tube (2) which is at least partially helical or spiral-shaped and a layer surrounding a lumen (4), and a transport packaging (3) covering the geothermal probes

Pipe assembly (1) in a helical or spiral-shaped region of the tube (2) encloses, characterized in that the polymeric material is a crosslinked polymeric material and that the transport packaging (3) the Erdwärmesonden- tube assembly (1) under axial bias holds in a first, contracted state in which the borehole heat exchanger tube assembly (1) occupies a smaller volume than in a second, expanded state in which the transport packaging (3) is no longer present.

2. Transport and storage unit according to claim 1, characterized in that the

Transport packaging (3) comprises at least one holding element, which is selected from the group consisting of films, cords, ropes, tapes, adhesive tapes and combinations thereof.

3. Transport and storage unit according to claim 1 or claim 2, characterized marked, that the transport packaging (3) is a transport foil packaging.

4. Transport and storage unit according to one of claims 1 to 3, characterized in that the polymeric material is a crosslinked polyolefin.

5. Transport and storage unit according to claim 4, characterized in that the crosslinked polyolefin is crosslinked polyethylene (PE-X).

6. Transport and storage unit according to claim 5, characterized in that the cross-linked polyethylene from the group consisting of peroxide-crosslinked polyethylene (PE-Xa), silane-crosslinked polyethylene (PE-Xb), electron beam crosslinked polyethylene (PE-Xc), Azobenetztem polyethylene (PE-Xd) and mixed variants of these crosslinked polyethylenes is selected.

7. Transport and storage unit according to one of claims 1 to 6, characterized marked, that in the polymeric material thermally conductive particles in an amount of

1 wt .-% to 40 wt .-%, preferably 10 wt .-% to 30 wt .-%, each based on the weight of the polymeric material, are included.

8. Transport and storage unit according to claim 7, characterized in that the

thermally conductive particles from the group consisting of graphite, mica, wollastonite,

Talc, chalk, glass fibers, metals and mixtures of these materials.

9. Transport and storage unit according to one of the preceding claims, characterized in that the tube (2) at least in sections an oval cross-section, preferably with an ovality in the range of 1% to 45%, particularly preferably with an ovality in the range of 10% up to 30%.

10. Transport and storage unit according to one of claims 1 to 9, characterized marked that pulling means (5) at least one point, preferably at two points, in particular at two opposite points along the circumference of the helical or spiral portion of Tube (2) are present.

11. Transport and storage unit according to claim 10, characterized in that the drawbars (5) are drawstrings.

12. Transport and storage unit according to claim 11, characterized in that the drawstrings on their the pipe (2) facing side have a layer of thermoplastic material which is stoffschlüs- sig connected to the polymeric material of the tube (2).

13. Transport and storage unit according to claim 11, characterized in that the drawstrings comprise an adhesive layer (6) and a tensile carrier layer (7).

14. Transport and storage unit according to claim 13, characterized in that the carrier layer (7) is reinforced by longitudinally inserted fibrous reinforcing threads or rovings and / or stretched to increase the tensile strength polymer material, preferably stretched polyethylene or polypropylene and / or polyethylene terephthalate as tensile polymer material comprises.

15. Transport and storage unit according to one of claims 10 to 14, characterized in that the pulling means (5) equidistant distances or with the laying depth decreasing distances of the helical or helical helix

Specify the area of the pipe (2).

16. Transport and storage unit according to any one of the preceding claims, characterized in that in the introduced into a wellbore state in the vicinity of the earth's surface farthest point of the tube (2) and / or the Zuginrichtun- conditions (5) a device for compensation of buoyancy forces and / or a device for receiving a spreading is present / are.

17. Transport and storage unit according to one of the preceding claims, characterized in that the polymeric material of the tube (2) comprises at least one layer which is constructed of a polymeric material whose FNCT value (filling

Notched Creep Test) according to ISO 16770 under the conditions 8O ⁰ C, 4 N / mm ² , 2% Arkopal N-100 at least 8760 h.