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Heat insulation pipe for geothermal exploitation and manufacturing method thereof

A technology of thermal insulation and manufacturing method, which is applied in the direction of protecting pipelines by thermal insulation, thermal insulation, pipeline protection, etc., can solve the problems of easy aging, poor resistance to internal pressure and external extrusion, well falling, etc., and achieves high thread connection strength, The effect of improving the utilization rate of geothermal heat and obvious thermal insulation effect

Inactive Publication Date: 2020-04-21
山东美生热能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The tensile strength is low, only tens of MPa, and the depth of going into the well is limited;
[0005] (2) Easy aging and short service life (about 1 year);
[0006] (3) On-site melting and welding, the quality is uncontrollable, and it is easy to cause the well to fall;
[0007] (4) The ability to resist internal pressure and external extrusion is poor. When water injection is started, the difference between internal and external pressure may easily cause deformation of the pipe string and fail to operate normally;
[0008] (5) The weight of the polyethylene pipe string is light, and the pipe string swings during water circulation, resulting in unstable water operation parameters and low efficiency

Method used

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  • Heat insulation pipe for geothermal exploitation and manufacturing method thereof
  • Heat insulation pipe for geothermal exploitation and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the above-mentioned geothermal heating adopts heat-insulating and heat-preserving pipes, including an inner lining pipe 1, an outer pipe 2 and a heat insulating material 3. Outside the inner liner 1 , the two ends of the outer tube 2 are respectively pressed against the outer flanges 11 at both ends of the inner liner 1 , and the cavity between the inner liner 1 and the outer tube 2 is filled with heat insulating material 3 .

[0036] The heat insulating material 3 is glass fiber.

[0037] The two ends of the outer pipe 2 are provided with external threads, and the different outer pipes 2 are connected by couplings 4, and the single geothermal heaters are connected into a whole with heat-insulating pipes, that is, the geothermal heaters use heat-insulated pipe strings.

[0038] The lining pipe 1 is a high-density polyethylene pipe, and the outer pipe 2 is a steel pipe.

[0039] The difference between the inner diameter of the outer tube 2 an...

Embodiment 2

[0047] The structure of the thermal insulation pipe used for geothermal development is shown in Example 1.

[0048] The difference is that the heat insulating material 3 is foamed polyurethane.

[0049] The difference between the inner diameter of the outer tube 2 and the outer diameter of the inner liner 1 is 5 mm.

[0050] Its manufacturing method consists of the following steps:

[0051] 1) Process the outer tube 2 according to the size, and process external threads at both ends of the outer tube 2;

[0052] 2) Cut out the high-density polyethylene lining pipe 1 according to the size;

[0053] 3) Put the high-density polyethylene lining pipe 1 into the steel outer pipe 2, and fill the cavity between the high-density polyethylene lining pipe 1 and the steel outer pipe 2 with foaming polyurethane to obtain Combined pipe body;

[0054] 4) Heat the combined pipe body to 90° C. and keep it for 30 minutes. The inner liner 1 expands and combines tightly with the outer pipe 2 ....

Embodiment 3

[0057] The structure of the thermal insulation pipe used for geothermal development is shown in Example 1.

[0058] The difference is that the heat insulating material 3 is aerogel.

[0059] The difference between the inner diameter of the outer tube 2 and the outer diameter of the inner liner 1 is 4 mm.

[0060] Its manufacturing method consists of the following steps:

[0061] 1) Process the outer tube 2 according to the size, and process external threads at both ends of the outer tube 2;

[0062] 2) Cut out the high-density polyethylene lining pipe 1 according to the size;

[0063] 3) Airgel with a thickness of 6mm is wrapped on the outside of the inner liner 1, and the high-density polyethylene liner 1 wrapped with the airgel is mechanically reduced in diameter, and then pulled into the steel outer pipe 2 to obtain a combined pipe body ;

[0064] 4) Heat the combined pipe body to 70°C and keep it for 60 minutes, the inner liner 1 expands and combines tightly with the o...

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Abstract

The invention relates to a heat insulation pipe for geothermal exploitation and a manufacturing method thereof, and belongs to the technical field of geothermal exploitation and utilization. The heatinsulation pipe for geothermal exploitation comprises a lining pipe, an outer pipe and a heat insulation material, the two ends of the lining pipe are bent to form outer flanges, the lining pipe is sleeved with the outer pipe, the two ends of the outer pipe abut against the outer flanges at the two ends of the lining pipe respectively, and a cavity between the lining pipe and the outer pipe is filled with the heat insulation material. The heat insulation pipe for geothermal exploitation has the advantages of being good in heat insulation performance, high in threaded connection strength, resistant to corrosion, self-lubricating, resistant to scaling, deep in the depth of entering a well and long in service life; and the manufacturing method of the heat insulation pipe is scientific, reasonable, simple and feasible.

Description

technical field [0001] The invention relates to a thermal insulation pipe for geothermal exploitation and a manufacturing method thereof, belonging to the technical field of geothermal exploitation and utilization. Background technique [0002] Geothermal energy is a clean and renewable energy source. With the adjustment of energy structure and the increasingly severe pressure of environmental protection, the utilization of geothermal energy is being paid attention to. According to the survey and evaluation results of the China Geological Survey Bureau of the Ministry of Land and Resources in 2015, the annual exploitable resources of shallow geothermal energy in 336 cities above the prefecture level in the country are equivalent to 700 million tons of standard coal; the national hydrothermal geothermal resources are equivalent to 1.25 trillion tons of standard For coal, the annual exploitable resources are equivalent to 1.9 billion tons of standard coal; the resources of ho...

Claims

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Application Information

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IPC IPC(8): F16L59/02
CPCF16L59/028
Inventor 王加德宿行俊华成光殷凤仕李文刚杨杰胡修军高慎旭
Owner 山东美生热能科技有限公司
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