CN214274928U - Geothermal well heat preservation pipe - Google Patents

Abstract

The utility model belongs to the technical field of the technique of geothermal well and specifically relates to a geothermal well insulating tube is related to, it includes the outer tube and is located the inner tube of outer tube, it has insulation material to fill between outer tube and the inner tube, inner tube and outer tube all adopt the steel pipe, outer tube port department is connected with the coupling, coupling cavity sets up, coupling inner wall ring is equipped with the screw thread, outer tube port department is equipped with the screw thread that uses with coupling inner wall cooperation, the outside expansion of inner tube both ends port is contradicted with the outer tube inner wall to pass through welded fastening in this department of contradicting. The utility model discloses has better thermal-insulated effect.

Description

Geothermal well heat preservation pipe

Technical Field

The utility model belongs to the technical field of the technique of geothermal well and specifically relates to a geothermal well insulating tube is related to.

Background

Geothermal energy is a clean renewable energy source. With the adjustment of energy structures and the increasing environmental pressure, the utilization of geothermal energy is receiving attention. According to the result of the investigation and evaluation of 2015 by the national geological survey bureau of the ministry of resources in China, the annual exploitable resource amount of shallow geothermal energy of cities above 336 land levels in the country is reduced to 7 hundred million tons of standard coal; the national hydrothermal geothermal resource amount is reduced to 1.25 trillion tons of standard coal, and the annual exploitable resource amount is reduced to 19 trillion tons of standard coal; the resource amount of the dry hot rock buried at 3000-10000 m is equivalent to 856 trillion tons of standard coal.

At present, a polyethylene pipe is mostly adopted as a heat-insulating pipe column in a geothermal well, and the following defects exist:

(1) the tensile strength is low, only dozens of mpa, and the downhole depth is limited;

(2) easy aging and short service life (about 1 year);

(3) the welding is melted on site, the quality is not controllable, and the well falling is easy to cause;

(4) the internal pressure and external extrusion resistance is poor, and when water injection is started, the internal and external pressure difference easily causes the deformation of the tubular column and the normal operation cannot be realized;

(5) the polyethylene pipe column has light dead weight, and the pipe column swings during water circulation, so that the water operation parameters are unstable, and the efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art exists, the utility model aims at providing a geothermal well insulating tube, it has better thermal-insulated effect.

The above object of the present invention is achieved by the following technical solutions:

the geothermal well heat-insulating pipe comprises an outer pipe and an inner pipe positioned in the outer pipe, wherein heat-insulating materials are filled between the outer pipe and the inner pipe, and the inner pipe and the outer pipe are both steel pipes.

By adopting the technical scheme, the heat insulation pipe has obvious heat insulation effect, the heat conductivity coefficient of the high-molecular polyethylene is about 0.5 w/(m.DEG C), and the heat conductivity coefficient of the heat insulation pipe is lower than 0.03 w/(m.DEG C), so that the geothermal utilization rate is improved by more than 30%. And because all adopt the steel pipe, have better tensile strength and structural strength, life is longer.

The present invention may be further configured in a preferred embodiment as: the outer pipe is a stainless steel pipe.

The present invention may be further configured in a preferred embodiment as: the inner pipe is a stainless steel pipe.

By adopting the technical scheme, the lining stainless steel pipe has high corrosion resistance, smooth surface and small fluid resistance in the hot water delivery process, and the characteristic of high mechanical strength of the steel pipe is reserved.

The present invention may be further configured in a preferred embodiment as: the heat insulation material adopts aerogel or glass fiber cloth or aluminum foil.

The present invention may be further configured in a preferred embodiment as: the ports at the two ends of the inner pipe are expanded outwards to abut against the inner wall of the outer pipe, and the abutting parts are fixed by welding.

Through adopting above-mentioned technical scheme, through with interior pipe port expansion, conveniently with inner tube and outer tube welded connection.

The present invention may be further configured in a preferred embodiment as: and welding rings are arranged between the ports at the two ends of the inner pipe and the outer pipe, and the inner pipe and the outer pipe are welded and fixed through heating the welding rings.

By adopting the technical scheme, the welding is convenient.

The present invention may be further configured in a preferred embodiment as: the coupling is connected to the outer pipe port, the coupling is arranged in a hollow mode, threads are arranged on the inner wall of the coupling in a surrounding mode, and threads matched with the inner wall of the coupling are arranged at the outer pipe port.

Through adopting above-mentioned technical scheme, conveniently connect two sections adjacent insulating tube, can tear into a plurality of segmentation insulating tubes with an insulating tube, convenient transportation.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the heat insulation and preservation pipe for geothermal exploitation prepared by the invention has obvious heat insulation effect, the heat conductivity coefficient of the high molecular polyethylene is about 0.5 w/(m.DEG C), the heat conductivity coefficient of the product is lower than 0.03 w/(m.DEG C), and the geothermal utilization rate is improved by 30 DEG C

% or more;

2. compared with the plastic pipe commonly used at present, the heat insulation pipe for geothermal exploitation prepared by the invention has heat insulation property

The advantages of good performance, high thread connection strength, deep well descending depth and long service life;

3. the stainless steel pipe with the inner lining has high corrosion resistance, smooth surface and small fluid resistance in the process of transporting hot water, and retains the steel

The mechanical strength of the pipe is high;

4. the corrosion of the galvanized steel pipe is overcome, the defects that the traditional hot-melt connected plastic pipe is easy to leak and age are overcome, and the hot-melt connected plastic pipe is an ideal product for upgrading and updating the water delivery steel pipe.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1;

FIG. 2 is a schematic view of the entire structure of embodiment 2.

In the figure, 1, an outer tube; 2. an inner tube; 3. a thermal insulation material; 4. a coupling; 5. and (6) welding the ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1:

referring to fig. 1, for the utility model discloses a geothermal well insulating tube, including outer tube 1 and the inner tube 2 that is arranged in outer tube 1.

And a heat insulation material 3 is filled between the outer pipe 1 and the inner pipe 2, and the heat insulation material 3 adopts aerogel or glass fiber cloth or aluminum foil to enhance the heat insulation effect of the heat insulation pipe.

The inner pipe 2 and the outer pipe 1 are both made of steel pipes, wherein the inner pipe 2 is preferably made of stainless steel pipes, the corrosion resistance in the hot water conveying process is high, the surface is smooth, the fluid resistance is small, the characteristic of high mechanical strength of the steel pipes is kept, and the outer pipe 1 can also be made of stainless steel pipes, so that the better tensile strength and toughness are ensured.

The 2 both ends ports of inner tube are outwards expanded and are contradicted with 1 inner wall of outer tube to department through welded fastening should contradicting, through the port expansion at 2 both ends of inner tube, can be in advance with the aerogel cladding as insulation material 3 on inner tube 2, then the welding is fixed with being connected of inner tube 2 and outer tube 1 on the one hand, and on the other hand avoids the aerogel to leak.

The port of the outer tube 1 is connected with a coupling 4, the coupling 4 is arranged in a hollow mode, threads are arranged on the inner wall of the coupling 4 in a surrounding mode, and the port of the outer tube 1 is provided with threads matched with the inner wall of the coupling 4.

Two adjacent sections of insulating tubes are conveniently connected, and one insulating tube can be disassembled into a plurality of sectional insulating tubes, so that the transportation is convenient.

Example 2:

referring to fig. 2, the utility model discloses a geothermal well insulating tube, with implement 1 the difference lie in, be equipped with welded ring 5 between the port at inner tube 2 both ends and the outer tube 1, through heating welded ring 5 with inner tube 2 and outer tube 1 welded fastening.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (7)

1. The utility model provides a geothermal well insulating tube which characterized in that: the heat-insulation composite pipe comprises an outer pipe (1) and an inner pipe (2) located in the outer pipe (1), wherein a heat-insulation material (3) is filled between the outer pipe (1) and the inner pipe (2), and the inner pipe (2) and the outer pipe (1) are both made of steel pipes.

2. The geothermal well thermal insulation pipe according to claim 1, wherein: the outer pipe (1) is a stainless steel pipe.

3. The geothermal well thermal insulation pipe according to claim 1, wherein: the inner pipe (2) is a stainless steel pipe.

4. The geothermal well thermal insulation pipe according to claim 1, wherein: the heat insulation material (3) is aerogel or glass fiber cloth or aluminum foil.

5. The geothermal well thermal insulation pipe according to claim 1, wherein: the ports at the two ends of the inner pipe (2) are expanded outwards to abut against the inner wall of the outer pipe (1), and the abutting positions are fixed by welding.

6. The geothermal well thermal insulation pipe according to claim 1, wherein: be equipped with between the port at inner tube (2) both ends and outer tube (1) welding ring (5), through heating welding ring (5) with inner tube (2) and outer tube (1) welded fastening.

7. The geothermal well thermal insulation pipe according to claim 1, wherein: outer tube (1) port department is connected with coupling (4), coupling (4) cavity sets up, coupling (4) inner wall ring is equipped with the screw thread, outer tube (1) port department is equipped with the screw thread that uses with coupling (4) inner wall cooperation.

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