Sand washing device for sandstone geothermal well

Abstract

The utility model relates to the technical field of geothermal well sand washing, and discloses a sandstone geothermal well sand washing device which comprises a foundation, a geothermal well is fixedly connected in the foundation, a sand washing column is arranged in the geothermal well, and the inner wall of the sand washing column is fixedly connected with a sand discharging pipeline. A telescopic conveying pipeline and a gas telescopic conveying pipe are fixedly connected into the sand flushing column, a high-pressure pump is fixedly connected to one end of the telescopic conveying pipeline, a high-pressure air pump is fixedly connected to one end of the gas telescopic conveying pipe, and a conveying base is slidably connected to the bottom of the sand flushing column. According to the device, the problems that the device lacks variable impact force, the disturbance effect is limited, a compact sand layer is difficult to loosen effectively, and the cleaning effect is influenced are solved, and the effects of increasing the direction and range of liquid injection, effectively removing deposited sand grains at the bottom of a well and in a shaft in cooperation with automatic vibration and ensuring more stable heat energy supply are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal well sand flushing, in particular to a sandstone geothermal well sand flushing device. Background Art

[0002] Sandstone geothermal wells are structures drilled into sandstone formations to capture underground heat and are commonly used for geothermal heating and power generation. Sand deposits can accumulate within the sandstone layers, reducing the well's water flow and hindering the effective utilization of geothermal resources. Therefore, using a sandstone geothermal well sand flushing device can effectively remove sand from the well bottom and wellbore, restoring the well's flow capacity and improving the well's water production rate and heat extraction efficiency. This device not only extends the well's service life but also ensures the stable operation of the geothermal system.

[0003] Traditional sandstone geothermal well sand flushing equipment begins with a high-pressure pump connected to a sand flushing string. High-pressure liquid is injected into the well through a nozzle, impacting the deposited sand layer at the bottom of the well. The high-pressure liquid jet creates a powerful flow, loosening and suspending the sand particles. A reverse circulation system then transports the sand-laden liquid from the bottom of the well upward to the wellhead, where it passes through a filter to separate the sand and liquid. During the operation, pressure and flow rate must be monitored in real time to ensure effective sand flushing and prevent damage to the wellbore wall. After sand flushing is complete, the discharged sand and liquid are cleaned to restore the well's permeability and improve the efficiency of geothermal resource utilization.

[0004] When used, traditional sandstone geothermal well sand flushing devices often rely on continuous high-pressure liquid impact, but lack variable impact force, which limits the disturbance effect on the sand layer and makes it difficult to effectively loosen the tight sand layer, affecting the cleaning effect. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a sandstone geothermal well sand flushing device, which aims to improve the problem that the traditional sandstone geothermal well sand flushing device lacks variable impact force, resulting in limited disturbance effect on the sand layer, making it difficult to effectively loosen the tight sand layer, affecting the cleaning effect.

[0006] To achieve the above-mentioned object, the utility model provides the following technical scheme: a sandstone geothermal well sand flushing device, comprising a foundation, the interior of the foundation is fixedly connected to the geothermal well, the interior of the geothermal well is provided with a sand flushing column, the inner wall of the sand flushing column is fixedly connected to a sand discharge pipe, the interior of the sand flushing column is fixedly connected to a telescopic conveying pipe and a telescopic gas conveying pipe, one end of the telescopic conveying pipe is fixedly connected to a high-pressure pump, one end of the telescopic gas conveying pipe is fixedly connected to the high-pressure air pump, the bottom of the sand flushing column is slidably connected to a conveying base, the telescopic conveying pipe and the bottom of the telescopic gas conveying pipe are both fixedly connected to the interior of the conveying base, a gas discharge groove is provided in the interior of the conveying base, a turbine is provided in the interior of the conveying base, an outer wall of the turbine is provided with a discharge assembly, the discharge assembly is used to discharge high-pressure liquid from the interior of the geothermal well, a vibration assembly is provided at the bottom of the conveying base, the vibration assembly is used to vibrate the bottom of the geothermal well, and the inner wall of the sand flushing column is fixedly connected to spiral blades;

[0007] The discharge assembly includes a connecting bracket, one end of which is fixedly connected to the outer wall of the turbine, the other end of which is fixedly connected to a diverter cylinder, and the outer wall of the conveying base is fixedly connected to two protective covers.

[0008] Furthermore, the vibration component includes an air pipe, the outer wall of the air pipe is fixedly connected to the bottom of the conveying base, one end of the conveying base is fixedly connected to a pneumatic vibrator, the output end of the pneumatic vibrator is fixedly connected to a vibration plate, and one side of the outer wall of the vibration plate is slidably connected to the bottom of the conveying base.

[0009] Furthermore, an extension sleeve is fixedly connected to the upper surface of the conveying base, the outer wall of the extension sleeve is slidably connected to the inside of the sand flushing column, the outer wall of the diversion cylinder is fixedly connected to a hinge, the outer wall of the hinge is fixedly connected to a fixed half-ring, the inner wall of the fixed half-ring is fixedly connected to a clamping block, the outer wall of the clamping block is slidably connected to the inside of the extension sleeve, and the outer wall of the sand flushing column is provided with a fixing component, which is used to fix one end of the fixed half-ring.

[0010] Furthermore, the fixing assembly includes a connecting block, the outer wall of the connecting block is fixedly connected to the outer wall of the sand flushing column, the interior of the connecting block is rotatably connected to a rotating shaft, one end of the rotating shaft is fixedly connected to a handle, and the outer wall of the rotating shaft is sleeved with a torsion spring.

[0011] Furthermore, the two protective covers are sequentially arranged on the upper and lower sides of the diverter tube, and the protective covers are used to protect the diverter tube.

[0012] Furthermore, the conveying base and the turbine are connected via a thrust ball bearing, and the diverter cylinder and the protective cover are connected via a bearing.

[0013] Furthermore, one end of the torsion spring is fixedly connected to the outer wall of the connecting block, and the other end of the torsion spring is fixedly connected to the inside of the handle.

[0014] Furthermore, the outer wall of the handle is slidably connected to the interior of the fixed half ring, and the handle is used to limit the mechanical energy of the fixed half ring.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the utility model, the high-pressure pump and the high-pressure air pump are first started to drive the air and liquid to be transported to the inside of the conveying base through the telescopic conveying pipe, the gas telescopic conveying pipe and the sand flushing column. Then, the turbine is driven to rotate by the high-pressure liquid, and the connecting bracket, the diverter tube and the protective cover are coordinated to drive the liquid to be evenly discharged to the bottom of the geothermal well. At the same time, the vibration plate is driven to vibrate by the flow of air in conjunction with the air pipe and the pneumatic vibrator, which solves the problem that the device lacks variable impact force, the disturbance effect is limited, and it is difficult to effectively loosen the tight sand layer, affecting the cleaning effect. The direction and range of liquid injection are increased, and at the same time, with the automatic vibration, the deposited sand particles at the bottom of the well and in the wellbore are effectively removed to ensure a more stable heat energy supply.

[0017] 2. In the present invention, the driving handle is first driven to cooperate with the rotating shaft, torsion spring and connecting block to fix and release the fixed half ring, and then cooperate with the hinge to drive the card block to move to fix and release the extension sleeve, thereby facilitating the extension sleeve to slide inside the sand flushing column to adjust the length. This allows the length of the device to be adjusted according to the depth of different geothermal wells, ensuring that the sand flushing operation can cover the appropriate depth and adapt to various formation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a sandstone geothermal well sand flushing device proposed in the utility model;

[0019] Figure 2 This is a schematic structural diagram of one side of a telescopic conveying pipeline of a sandstone geothermal well sand flushing device proposed in the utility model;

[0020] Figure 3 This is a schematic diagram of the inner structure of a diversion tube of a sandstone geothermal well sand flushing device proposed in the utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of a conveying base of a sandstone geothermal well sand flushing device proposed in the utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of a sand flushing column of a sandstone geothermal well sand flushing device proposed in the utility model;

[0023] Figure 6 This is a structural schematic diagram of the handle side of a sandstone geothermal well sand flushing device proposed by the utility model.

[0024] Legend:

[0025] 1. Foundation; 2. Geothermal well; 3. Sand flushing column; 4. Sand discharge pipe; 5. High-pressure pump; 6. High-pressure air pump; 7. Telescopic conveying pipe; 8. Telescopic gas conveying pipe; 9. Conveying base; 10. Gas discharge trough; 11. Turbine; 12. Connecting bracket; 13. Diverter tube; 14. Protective cover; 15. Air pipe; 16. Pneumatic vibrator; 17. Vibrating plate; 18. Extension sleeve; 19. Hinge; 20. Fixed half ring; 21. Block; 22. Handle; 23. Rotating shaft; 24. Torsion spring; 25. Connecting block; 26. Spiral blade. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Reference Figure 1 - Figure 4The utility model provides an embodiment of a sandstone geothermal well sand flushing device, comprising a foundation 1, a geothermal well 2 fixedly connected to the interior of the foundation 1, a sand flushing column 3 provided inside the geothermal well 2, a sand discharge pipe 4 fixedly connected to the inner wall of the sand flushing column 3, a telescopic conveying pipe 7 and a gas telescopic conveying pipe 8 fixedly connected to the interior of the sand flushing column 3, gas and liquid are conveyed to the interior of a conveying base 9 through the telescopic conveying pipe 7 and the gas telescopic conveying pipe 8, one end of the telescopic conveying pipe 7 is fixedly connected to a high-pressure pump 5, one end of the gas telescopic conveying pipe 8 is fixedly connected to a high-pressure air pump 6, and high-pressure gas and liquid are conveyed to the interior of the telescopic conveying pipe 7 and the gas telescopic conveying pipe 8 through the high-pressure pump 5 and the high-pressure air pump 6. The bottom of the column 3 is slidably connected to a delivery base 9, and the bottoms of the telescopic delivery pipe 7 and the telescopic gas delivery pipe 8 are fixedly connected to the inside of the delivery base 9. A gas discharge groove 10 is provided inside the delivery base 9, and high-pressure gas is delivered through the preset gas discharge groove 10 inside the delivery base 9, and thus discharged to the bottom of the geothermal well 2. A turbine 11 is provided inside the delivery base 9, and the turbine 11 is driven to rotate by the flow of liquid. The outer wall of the turbine 11 is provided with a discharge component, which is used to discharge high-pressure liquid from the inside of the geothermal well 2. A vibration component is provided at the bottom of the delivery base 9, and the vibration component is used to vibrate the bottom of the geothermal well 2. The inner wall of the sand flushing column 3 is fixedly connected with a spiral blade 26;

[0028] The discharge component includes a connecting bracket 12, one end of the connecting bracket 12 is fixedly connected to the outer wall of the turbine 11, and the other end of the connecting bracket 12 is fixedly connected to a diverter tube 13. The outer wall of the delivery base 9 is fixedly connected to two protective covers 14. The rotation of the turbine 11 drives the diverter tube 13 to rotate through the connecting bracket 12, thereby driving the liquid to be evenly discharged into the interior of the geothermal well 2. During this process, the diverter tube 13 is protected by the protective cover 14. The vibration component includes an air pipe 15, the outer wall of the air pipe 15 is fixedly connected to the bottom of the delivery base 9, one end of the delivery base 9 is fixedly connected to a pneumatic vibrator 16, the output end of the pneumatic vibrator 16 is fixedly connected to a vibration plate 17, and one side of the outer wall of the vibration plate 17 is slidably connected to the bottom of the delivery base 9. During the high-pressure gas delivery process, part of the gas will be delivered to the interior of the pneumatic vibrator 16 through the air pipe 15, thereby starting the pneumatic vibrator 16 to drive the vibration plate 17 to vibrate;

[0029] Reference Figure 1 、 Figure 5 and Figure 6The upper surface of the conveying base 9 is fixedly connected to an extension sleeve 18, and the outer wall of the extension sleeve 18 is slidably connected to the inside of the sand-washing column 3. The outer wall of the diverter cylinder 13 is fixedly connected to a hinge 19, and the outer wall of the hinge 19 is fixedly connected to a fixed semi-ring 20. The inner wall of the fixed semi-ring 20 is fixedly connected to a clamping block 21, and the outer wall of the clamping block 21 is slidably connected to the inside of the extension sleeve 18. The outer wall of the sand-washing column 3 is provided with a fixing assembly, which is used to fix one end of the fixed semi-ring 20. Pull the fixed semi-ring 20 so that one end of the fixed semi-ring 20 rotates with the hinge 19 as the center of the circle, and then drive the clamping block 21 to move out of the interior of the extension sleeve 18 through the fixed semi-ring 20. At this time, the extension sleeve 18 is no longer restricted, and then the extension sleeve 18 can be pulled to slide inside the sand-washing column 3 to achieve the effect of length adjustment. The fixing assembly includes a connecting block 25, the outer wall of the connecting block 25 is fixedly connected to the outer wall of the sand-washing column 3, and the inner rotation of the connecting block 25 is connected to the rotating shaft 23. The rotating shaft 2 When the handle 22 is rotated 90 degrees, the fixed half ring 20 can be moved out or put back to one side of the handle 22, and the handle 22 can be released. At this time, the torsion spring 24 is no longer subjected to force and rebounds, thereby driving the handle 22 to return to its initial state, thereby achieving the fixation and release of the fixed half ring 20. The two protective covers 14 are arranged on the upper and lower sides of the diverter cylinder 13 in sequence. The protective cover 14 is used to protect the diverter cylinder 13. The conveying base 9 and the turbine 11 are connected by a thrust ball bearing, and the diverter cylinder 13 and the protective cover 14 are connected by a bearing. One end of the torsion spring 24 is fixedly connected to the outer wall of the connecting block 25, and the other end of the torsion spring 24 is fixedly connected to the inside of the handle 22. The outer wall of the handle 22 is slidably connected to the inside of the fixed half ring 20, and the handle 22 is used to mechanically limit the fixed half ring 20.

[0030] Working principle: When the sandstone geothermal well sand flushing device is needed, first, water is delivered to the inside of the delivery base 9 through the high-pressure pump 5 and the telescopic delivery pipe 7, and at the same time, air is delivered to the middle of the delivery base 9 through the high-pressure air pump 6 and the telescopic delivery pipe 7. At this time, the water source passes through the inside of the delivery base 9 and is discharged from the diverter tube 13 to the inside of the geothermal well 2. In this process, the impact of the high-pressure water source drives the turbine 11 to rotate, and then the turbine 11 drives the connecting bracket 12 and the diverter tube 13 to rotate, thereby driving the water source to be evenly sprayed into the inside of the geothermal well 2. At the same time, the air passes through the inside of the delivery base 9. The gas is transported from the gas discharge trough 10 at the bottom of the geothermal well 2 to the interior of the geothermal well 2. At this time, the air and liquid combine to form a gas-liquid mixture, which reduces the density of the liquid, making it more effective in carrying sand and making it easier for sand to be carried out of the bottom of the well. During this process, part of the air will be transported to the pneumatic vibrator 16 through the air pipe 15, thereby starting the pneumatic vibrator 16 to drive the vibration plate 17 to vibrate, thereby assisting the liquid flushing and improving the sand suspension effect. Finally, the sand and liquid will be transported to the interior of the sand flushing column 3 through the preset through-holes inside the sand flushing column 3, and then the spiral blades 26 will generate a rotating upward fluid flow, accelerating the carrying and backflow of the sand.

[0031] In addition, the driving handle 22 is rotated 90 degrees, thereby twisting the torsion spring 24. When the handle 22 forms a parallel state, the fixed half ring 20 will no longer be restricted. Then, the fixed half ring 20 can be pulled to rotate with the hinge 19 as the center of the circle, so that the block 21 moves out of the interior of the extension sleeve 18. Then, the extension sleeve 18 can be pulled to slide inside the sand flushing column 3 to achieve the effect of adjusting the length of the device.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sandstone geothermal well sand flushing device, comprising a foundation (1), characterized in that: The interior of the foundation (1) is fixedly connected to a geothermal well (2), a sand flushing column (3) is provided inside the geothermal well (2), the inner wall of the sand flushing column (3) is fixedly connected to a sand discharge pipe (4), the interior of the sand flushing column (3) is fixedly connected to a telescopic delivery pipe (7) and a gas telescopic delivery pipe (8), one end of the telescopic delivery pipe (7) is fixedly connected to a high-pressure pump (5), one end of the gas telescopic delivery pipe (8) is fixedly connected to a high-pressure gas pump (6), the bottom of the sand flushing column (3) is slidably connected to a delivery base (9), the telescopic delivery pipe (7) is fixedly connected to the bottom of the sand flushing column (3), and the telescopic delivery pipe (7) is fixedly connected to the bottom of the sand flushing column (3). The bottom of the gas telescopic delivery pipe (8) is fixedly connected to the inside of the delivery base (9), a gas discharge groove (10) is provided inside the delivery base (9), a turbine (11) is provided inside the delivery base (9), and a discharge assembly is provided on the outer wall of the turbine (11), and the discharge assembly is used to discharge high-pressure liquid from the inside of the geothermal well (2). The bottom of the delivery base (9) is provided with a vibration assembly, and the vibration assembly is used to vibrate the bottom of the geothermal well (2). The inner wall of the sand flushing column (3) is fixedly connected to a spiral blade (26); The discharge assembly comprises a connecting bracket (12), one end of the connecting bracket (12) is fixedly connected to the outer wall of the turbine (11), the other end of the connecting bracket (12) is fixedly connected to a diverter cylinder (13), and the outer wall of the conveying base (9) is fixedly connected to two protective covers (14).

2. The sandstone geothermal well sand flushing device according to claim 1, characterized in that: The vibration assembly comprises an air pipe (15), the outer wall of the air pipe (15) is fixedly connected to the bottom of the conveying base (9), one end of the conveying base (9) is fixedly connected to a pneumatic vibrator (16), the output end of the pneumatic vibrator (16) is fixedly connected to a vibration plate (17), and one side of the outer wall of the vibration plate (17) is slidably connected to the bottom of the conveying base (9).

3. The sandstone geothermal well sand flushing device according to claim 1, characterized in that: The upper surface of the conveying base (9) is fixedly connected to an extension sleeve (18), the outer wall of the extension sleeve (18) is slidably connected to the inside of the sand flushing column (3), the outer wall of the diversion cylinder (13) is fixedly connected to a hinge (19), the outer wall of the hinge (19) is fixedly connected to a fixed half ring (20), the inner wall of the fixed half ring (20) is fixedly connected to a clamping block (21), the outer wall of the clamping block (21) is slidably connected to the inside of the extension sleeve (18), and the outer wall of the sand flushing column (3) is provided with a fixing component, and the fixing component is used to fix one end of the fixed half ring (20).

4. The sandstone geothermal well sand flushing device according to claim 3, characterized in that: The fixing assembly comprises a connecting block (25), the outer wall of the connecting block (25) is fixedly connected to the outer wall of the sand flushing column (3), the interior of the connecting block (25) is rotatably connected to a rotating shaft (23), one end of the rotating shaft (23) is fixedly connected to a handle (22), and the outer wall of the rotating shaft (23) is sleeved with a torsion spring (24).

5. The sandstone geothermal well sand flushing device according to claim 1, characterized in that: The two protective covers (14) are sequentially arranged on the upper and lower sides of the diverter tube (13), and the protective covers (14) are used to protect the diverter tube (13).

6. The sandstone geothermal well sand flushing device according to claim 1, characterized in that: The conveying base (9) and the turbine (11) are connected via a thrust ball bearing, and the diverter cylinder (13) and the protective cover (14) are connected via a bearing.

7. The sandstone geothermal well sand flushing device according to claim 4, characterized in that: One end of the torsion spring (24) is fixedly connected to the outer wall of the connecting block (25), and the other end of the torsion spring (24) is fixedly connected to the inside of the handle (22).

8. The sandstone geothermal well sand flushing device according to claim 4, characterized in that: The outer wall of the handle (22) is slidably connected to the interior of the fixed half ring (20), and the handle (22) is used to mechanically limit the fixed half ring (20).

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