Middle-deep geothermal underground heat exchange device

Abstract

The utility model discloses a middle-deep layer geothermal underground heat exchange device which comprises a geothermal well, a heat taking inner pipe and a cyclone desander, a water injection tank is fixedly installed at an inlet of the geothermal well, a water injection opening is formed in the side wall of the water injection tank and connected with a water injection pipe, the heat taking inner pipe penetrates through a through hole of the water injection tank and extends into the geothermal well, and the cyclone desander is connected with the heat taking inner pipe. The heat removal inner pipe is fixedly connected with the top of the water injection tank through a flange ring which is fixedly connected with the heat removal inner pipe, during use, the heat removal inner pipe extracts a heated medium from the bottom of the geothermal well, the extracted medium enters the heat removal inner pipe after being filtered by the filter pipe, and the output medium is conveyed into the cyclone desander through the connecting pipe and is desanded again through the cyclone desander; and along with the increase of the medium in the cyclone desander, the medium passes through the filter cover fixedly mounted at the bottom of the barrel cover and overflows from the water outlet head, so that the medium extracted from the geothermal well is filtered for multiple times, and the cleanness of the output medium is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchange devices, specifically a medium-deep geothermal well downhole heat exchange device. Background Technology

[0002] Deep-hole heat exchange technology refers to the technology of developing deep geothermal energy by circulating fluids inside a single well through a coaxial casing in a deep well and exchanging heat with the formation based on heat conduction.

[0003] However, current downhole heat exchange devices for medium-deep geothermal wells directly insert the heat extraction inner tube into the geothermal well. Due to the presence of impurities in the well, the water flow will carry these impurities into the heat extraction inner tube during water exchange. These impurities will be output along with the water flow and enter the heat exchange device connected to the heat extraction inner tube, which will affect the service life of the device. To address the above problems, a new downhole heat exchange device for medium-deep geothermal wells is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a downhole heat exchange device for medium-deep geothermal wells to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A medium-deep geothermal well downhole heat exchange device includes a geothermal well, a heat-extracting inner tube, and a cyclone desander. A water injection tank is fixedly installed at the inlet of the geothermal well, and a water injection port is provided on the side wall of the water injection tank. The water injection port is connected to a water injection pipe. The heat-extracting inner tube passes through the through hole of the water injection tank into the geothermal well. The heat-extracting inner tube is fixedly connected to the top of the water injection tank through a fixed flange ring. A filter pipe is fixedly installed at the bottom end of the heat-extracting inner tube inside the geothermal well. A connecting pipe is fixedly connected to the top end of the heat-extracting inner tube. The connecting pipe is connected to the input end of the cyclone desander. The output end of the cyclone desander is fixedly connected to an outlet pipe.

[0007] As a further embodiment of this utility model: an arc-shaped base is fixedly installed at the bottom end of the filter pipe, and the arc-shaped base is in contact with the bottom of the geothermal well.

[0008] As a further improvement of this utility model: a protective sleeve is fixedly installed inside the water injection tank, the protective sleeve is fitted onto the heat extraction inner pipe, and the bottom end of the protective sleeve extends through the bottom end of the water injection tank into the geothermal well.

[0009] As a further embodiment of this utility model: the cyclone sand separator includes a conical barrel and a barrel cover. The side wall of the conical barrel is provided with a water inlet head, which is connected to the end of a connecting pipe. The top of the barrel cover is provided with a water outlet head, which is connected to a water outlet pipe. Connecting rings are fixedly installed at the connection between the conical barrel and the barrel cover. The connecting rings fit together and are fixedly connected by bolts. A drain valve is fixedly installed at the drain port at the bottom of the conical barrel. A filter cover is fixedly installed on the inner wall of the barrel cover below the water outlet head. A connecting shaft is fixedly installed at the bottom of the filter cover. A connector is rotatably connected to the connecting shaft. Multiple blades are fixedly fixedly connected to the side wall of the connector in a circumferential manner.

[0010] As a further embodiment of this utility model: an L-shaped rod is symmetrically fixedly connected to the side wall of the connector above the blade, and brush bristles are fixedly connected to the inner side of the L-shaped rod, with the ends of the brush bristles attached to the outer wall of the filter cover.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In use, the heating inner tube extracts the heated medium from the bottom of the geothermal well. The extracted medium is filtered through the filter tube and enters the heating inner tube. The output medium is transported to the hydrocyclone desander through the connecting pipe. After being desanded again by the hydrocyclone desander, as the medium in the hydrocyclone desander increases, the medium passes through the filter cover fixedly installed at the bottom of the barrel cover and overflows from the outlet. This achieves multiple filtrations of the medium extracted from the geothermal well, which is beneficial to the cleanliness of the output medium.

[0013] 2. This utility model prevents the flowing medium from impacting the heat-extracting inner tube by covering it with a protective sleeve inside the water injection tank. At the same time, the arc-shaped base fits into the bottom of the geothermal well, thus supporting the heat-extracting inner tube and increasing its stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a downhole heat exchange device for medium-deep geothermal wells.

[0015] Figure 2 This is a diagram of a cyclone desander in a medium-deep geothermal well downhole heat exchange device.

[0016] Figure 3 This is a partial cross-sectional view of a medium-deep geothermal well downhole heat exchange device.

[0017] In the diagram: 1. Geothermal well; 2. Filter pipe; 3. Arc-shaped base; 4. Inner heat extraction pipe; 5. Water injection tank; 6. Water injection port; 7. Cyclone sand separator; 8. Water outlet pipe; 9. Connecting pipe; 10. Protective sleeve; 11. Conical barrel; 12. Water inlet head; 13. Barrel lid; 14. Water outlet head; 15. Drain valve; 16. Connecting ring; 17. Filter cover; 18. Connecting shaft; 19. Connector; 20. Blade; 21. L-shaped rod; 22. Brush bristles. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-3 In this embodiment of the utility model, a medium-deep geothermal well downhole heat exchange device includes a geothermal well 1, a heat-extracting inner pipe 4, and a cyclone desander 7. A water injection tank 5 is fixedly installed at the inlet of the geothermal well 1. A safety valve is installed on the top of the water injection tank 5 to prevent excessive pressure inside the water injection tank 5. A water injection port 6 is provided on the side wall of the water injection tank 5 and is connected to a water injection pipe. The heat-extracting inner pipe 4 passes through the through hole of the water injection tank 5 into the geothermal well 1. The heat-extracting inner pipe 4 is fixedly connected to the top of the water injection tank 5 through a fixed flange ring. A filter pipe 2 is fixedly installed at the bottom end of the heat-extracting inner pipe 4 inside the geothermal well 1. A connecting pipe 9 is fixedly connected to the top end of the heat-extracting inner pipe 4. The connecting pipe 9 is connected to the input end of the cyclone desander 7. The output end of the cyclone desander 7 is fixedly connected to an outlet pipe 8.

[0020] During use, the water injection pipe delivers the heat exchange medium to the water injection tank 5 through the water injection port 6. The medium enters the geothermal well 1 through the connecting hole between the water injection tank 5 and the geothermal well 1. The heat extraction inner tube 4 extracts the heated medium from the bottom of the geothermal well 1. The extracted medium is filtered through the filter pipe 2 and enters the heat extraction inner tube 4. The output medium is delivered to the cyclone desander 7 through the connecting pipe 9. The cyclone desander 7 removes sand again, which helps to clean the output medium.

[0021] An arc-shaped base 3 is fixedly installed at the bottom of the filter tube 2. The arc-shaped base 3 fits against the bottom of the geothermal well 1 to support the heat extraction inner tube 4 and increase the stability of the heat extraction inner tube 4.

[0022] A protective sleeve 10 is fixedly installed inside the water injection tank 5. The protective sleeve 10 is fitted onto the heat extraction inner tube 4, and the bottom end of the protective sleeve 10 extends through the bottom end of the water injection tank 5 into the geothermal well 1. When the heat exchange medium is injected into the water injection tank 5, the injected heat exchange medium is blocked and protected by the protective sleeve 10, which prevents the flowing medium from impacting the heat extraction inner tube 4 and ensures the stability of the heat extraction inner tube 4.

[0023] The cyclone sand separator 7 includes a conical barrel 11 and a barrel cover 13. An inlet head 12 is provided on the side wall of the conical barrel 11, and the inlet head 12 is connected to the end of the connecting pipe 9. An outlet head 14 is provided on the top of the barrel cover 13, and the outlet head 14 is connected to the outlet pipe 8. Connecting rings 16 are fixedly installed at the connection between the conical barrel 11 and the barrel cover 13. The connecting rings 16 fit together and are fixedly connected by bolts. A drain valve 15 is fixedly installed at the drain outlet at the bottom of the conical barrel 11. The inner wall of the barrel cover 13 is connected to the outlet head 14. A filter cover 17 is fixedly installed below the filter cover 17. A connecting shaft 18 is fixedly installed at the bottom of the filter cover 17. A connector 19 is rotatably connected to the connecting shaft 18. Multiple blades 20 are evenly fixedly connected to the side wall of the connector 19. The medium is taken out and enters the conical barrel 11 from the inlet head 12. The medium rotates with the inner wall of the conical barrel 11, and the fluid carries the blades 20 to rotate. The rotating medium accelerates the sedimentation of sand and gravel in the medium. As the medium increases, the medium passes through the filter cover 17 and overflows from the outlet head 14.

[0024] The connector 19 has an L-shaped rod 21 symmetrically fixedly connected to the side wall above the blade 20. Brush bristles 22 are fixedly connected to the inner side of the L-shaped rod 21. The ends of the brush bristles 22 are attached to the outer wall of the filter cover 17. The blade 20 rotates with the connector 19, and the rotating connector 19 rotates with the L-shaped rod 21. The rotating L-shaped rod 21 cleans the filter cover 17 through the fixedly connected brush bristles 22.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A downhole heat exchange device for a medium-depth geothermal well, comprising a geothermal well (1) and a heat-removing inner pipe (4) and a cyclone sand remover (7), characterized in that: The water injection tank (5) is fixedly installed at the inlet of the geothermal well (1), the side wall of the water injection tank (5) is provided with a water injection opening (6) connected with a water injection pipe, the heat extraction inner pipe (4) penetrates through the through hole of the water injection tank (5) into the geothermal well (1), the heat extraction inner pipe (4) is fixedly connected with the top of the water injection tank (5) through the flange ring, the bottom end of the heat extraction inner pipe (4) is fixedly installed with a filter pipe (2) in the geothermal well (1), the top end of the heat extraction inner pipe (4) is fixedly connected with a connecting pipe (9), the connecting pipe (9) is connected with the input end of the cyclone sand remover (7), the output end of the cyclone sand remover (7) is fixedly connected with a water outlet pipe (8).

2. The heat exchanger device for use in a medium-depth geothermal well according to claim 1, characterized in that: The bottom end of the filter pipe (2) is fixedly installed with an arc-shaped base (3) which is attached to the bottom of the geothermal well (1).

3. The heat exchanger device for use in a medium-depth geothermal well according to claim 1, characterized in that: The water injection tank (5) is fixedly installed with a protective sleeve (10) which is sleeved on the heat extraction inner pipe (4) and penetrates through the bottom end of the water injection tank (5) into the geothermal well (1).

4. The heat exchanger device for use in a medium-depth geothermal well according to claim 1, characterized in that: The cyclone sand remover (7) comprises a conical barrel (11) and a barrel cover (13), the side wall of the conical barrel (11) is provided with a water inlet head (12) connected with the end of the connecting pipe (9), the top of the barrel cover (13) is provided with a water outlet head (14) connected with the water outlet pipe (8), the connecting rings (16) are fixedly installed at the connection of the conical barrel (11) and the barrel cover (13), the connecting rings (16) are attached to each other and fixedly connected through bolts, the blowdown valve (15) is fixedly installed at the blowdown opening of the bottom of the conical barrel (11), the filter cover (17) is fixedly installed on the inner wall of the barrel cover (13) below the water outlet head (14), the connecting shaft (18) is fixedly installed at the bottom of the filter cover (17), the connecting head (19) is rotatably connected with the connecting shaft (18), the plurality of blades (20) are fixedly connected with the side wall of the connecting head (19) in a circumferential direction.

5. The heat exchanger device for use in a medium-depth geothermal well according to claim 4, characterized in that: The L-shaped rods (21) are fixedly connected with the side wall of the connecting head (19) above the blades (20) in a symmetrical manner, the bristles (22) are fixedly connected with the inner side of the L-shaped rods (21), and the end of the bristles (22) is attached to the outer wall of the filter cover (17).

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