Novel middle-deep geothermal well sealing device

Abstract

The utility model relates to the technical field of geothermal well sealing, and discloses a novel medium-deep geothermal well sealing device which comprises a geothermal well body, a sealing cover is placed outside the geothermal well body, a locking assembly is installed outside the sealing cover, a threaded rod is rotationally connected into the sealing cover, and a threaded rod is installed in the threaded rod. A sealing assembly is mounted outside the threaded rod; the locking assembly comprises a fixing ring, and the fixing ring is fixedly connected to the outer portion of the geothermal well body. According to the utility model, the fixing ring is stably connected with the geothermal well body, and the arc-shaped locking block is driven to slide in the fixing ring by pushing the connecting plate, so that the sealing cover can be quickly and firmly fixed and is prevented from displacing. The installation mode is easy to operate, the fixing effect is good, the installation time can be effectively shortened, the working efficiency is improved, and meanwhile the stability of the device in the using process is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of geothermal well sealing technology, and in particular to a novel sealing device for medium-deep geothermal wells. Background Technology

[0002] In the drilling construction of geothermal water development, because the geothermal reservoir is usually buried at a deep depth and is affected by the surrounding geological structure, geothermal water usually has a high head pressure. Therefore, after the well is completed, geothermal water will exhibit a self-flowing phenomenon. At this time, it is necessary to use a wellhead sealing structure to seal the geothermal wellhead.

[0003] Most existing geothermal well sealing devices are permanent, involving the direct injection of large amounts of cement into the wellhead. This cement directly damages the existing aquifer, rendering the geothermal well unusable. Furthermore, the sealing device is difficult to disassemble, resulting in a significant waste of resources. Therefore, a novel sealing device for medium-deep geothermal wells is proposed to address these issues. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a novel sealing device for medium-deep geothermal wells, which aims to improve the problem of inconvenient disassembly after sealing in the existing technology, resulting in resource waste.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel sealing device for medium-deep geothermal wells includes a geothermal well body, a sealing cover placed on the outside of the geothermal well body, a locking assembly installed on the outside of the sealing cover, a threaded rod rotatably connected inside the sealing cover, and a sealing assembly installed outside the threaded rod; the locking assembly includes a fixing ring, which is fixedly connected to the outside of the geothermal well body, a fixing block fixedly connected to the outside of the fixing ring, an arc-shaped locking block slidably connected inside the fixing ring, a connecting plate fixedly connected to the outside of the arc-shaped locking block, and the arc-shaped locking block slidably connected to the inner side of the fixing block;

[0007] As a further description of the above technical solution:

[0008] The sealing assembly includes a sealing plate, which is fixedly connected inside the geothermal well body. The threaded rod is rotatably connected inside the sealing plate. A movable plate is fixedly connected to the end of the threaded rod, and a rotating handle is fixedly connected to the outside of the threaded rod.

[0009] As a further description of the above technical solution:

[0010] A pump chamber pipe is fixedly connected to the outside of the movable plate, a cement isolation layer is fixedly connected to the outside of the pump chamber pipe, and a quartz sand isolation layer is fixedly connected to the bottom of the cement isolation layer.

[0011] As a further description of the above technical solution:

[0012] A spring is fixedly connected inside the geothermal well body, and a surface pipe is fixedly connected to the outside of the spring. The inside of the surface pipe is in contact with the outside of the pump chamber pipe.

[0013] As a further description of the above technical solution:

[0014] The quartz sand isolation layer is fixedly connected to the outside of a packer;

[0015] As a further description of the above technical solution:

[0016] A water layer sleeve is fixedly connected to the bottom of the quartz sand isolation layer, and a check valve is fixedly connected inside the water layer sleeve.

[0017] As a further description of the above technical solution:

[0018] The movable plate is rotatably connected inside the geothermal well body;

[0019] As a further description of the above technical solution:

[0020] The sealing cap has a pressure relief port in the middle.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a fixing ring is securely connected to the geothermal well body. By pushing the connecting plate, the arc-shaped locking block slides within the fixing ring, quickly and firmly fixing the sealing cover and preventing displacement. This installation method is simple to operate, has a good fixing effect, effectively shortens installation time, improves work efficiency, and ensures the stability of the device during use.

[0023] 2. In this invention, rotating the handle causes the threaded rod to rotate within the sealing plate, which in turn causes the movable plate to rotate, thereby compressing the internal space of the geothermal well and enhancing the sealing effect. Furthermore, because rotating the handle to drive the threaded rod allows for better adaptation to different sealing requirements, the applicable sealing range can be flexibly adjusted. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a novel medium-deep geothermal well sealing device proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the arc-shaped locking block of a novel medium-deep geothermal well sealing device proposed in this utility model;

[0026] Figure 3This is a schematic diagram of the packer structure of a novel medium-deep geothermal well sealing device proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the check valve structure of a novel medium-deep geothermal well sealing device proposed in this utility model.

[0028] Legend:

[0029] 1. Geothermal well body; 2. Sealing cap; 3. Pressure relief port; 4. Rotating handle; 5. Fixing block; 6. Fixing ring; 7. Arc-shaped locking block; 8. Connecting plate; 9. Sealing plate; 10. Movable plate; 11. Threaded rod; 12. Pump chamber pipe; 13. Surface pipe; 14. Spring; 15. Cement isolation layer; 16. Quartz sand isolation layer; 17. Packer; 18. Water layer casing; 19. Check valve. Detailed Implementation

[0030] 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.

[0031] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a novel medium-deep geothermal well sealing device, comprising a geothermal well body 1, a sealing cover 2 placed on the outside of the geothermal well body 1, a locking assembly installed on the outside of the sealing cover 2, a threaded rod 11 rotatably connected inside the sealing cover 2, and a sealing assembly installed on the outside of the threaded rod 11; the locking assembly includes a fixing ring 6, which is fixedly connected to the outside of the geothermal well body 1, a fixing block 5 fixedly connected to the outside of the fixing ring 6, an arc-shaped locking block 7 slidably connected inside the fixing ring 6, a connecting plate 8 fixedly connected to the outside of the arc-shaped locking block 7, and the arc-shaped locking block 7 slidably connected to the inside of the fixing block 5. The fixing ring 6 is fixed to the outside of the geothermal well body 1, and the arc-shaped locking block 7 can slide inside the fixing ring 6. When it is necessary to fix the sealing cover 2, the connecting plate 8 can be pushed to make the arc-shaped locking block 7 slide inside the fixing block 5, thereby tightly fixing the sealing cover 2 to the geothermal wellhead, achieving the initial wellhead sealing and fixing function. The sealing cap 2 has a pressure relief port 3 in the middle. The pressure relief port 3 prevents excessive pressure from damaging the entire well sealing device and maintains the pressure balance inside the well.

[0032] Reference Figure 1 , Figure 3 and Figure 4The sealing assembly includes a sealing plate 9, which is fixedly connected inside the geothermal well body 1. A threaded rod 11 is rotatably connected inside the sealing plate 9. A movable plate 10 is fixedly connected to the end of the threaded rod 11. A rotating handle 4 is fixedly connected to the outside of the threaded rod 11. The sealing plate 9 is fixed inside the geothermal well body 1. Rotating the rotating handle 4 can drive the threaded rod 11 to rotate. When the threaded rod 11 rotates, it will drive the movable plate 10 to move along the axial direction of the threaded rod 11. The movement of the movable plate 10 can compress the space inside the geothermal well body 1, further enhancing the sealing effect. Moreover, the movable plate 10 can be rotatably connected inside the geothermal well body 1, which can better adapt to different sealing requirements. The movable plate 10 is externally fixedly connected to a pump chamber pipe 12. During geothermal extraction, underground hot water converges along a specific path into the pump chamber pipe 12, and is then transported to relevant equipment on the surface for subsequent use, such as heating and power generation. A cement isolation layer 15 is externally fixedly connected to the pump chamber pipe 12, and a quartz sand isolation layer 16 is fixedly connected to the bottom of the cement isolation layer 15. The pump chamber pipe 12 and these isolation layers work together to form a relatively independent space. The cement isolation layer 15 prevents external impurities such as soil and rock particles from entering the area around the pump chamber pipe 12, avoiding wear or blockage. The quartz sand isolation layer 16 further enhances this isolation effect and also filters out some small particles, reducing impurities entering the pump chamber pipe 12, protecting the fluid flow inside the pump chamber pipe 12, and extending the service life of the pipe. A spring 14 is fixedly connected inside the geothermal well body 1. A surface pipe 13 is fixedly connected to the outside of the spring 14. The inner side of the surface pipe 13 contacts the outside of the pump chamber pipe 12. When the pressure inside the well fluctuates or the pump chamber pipe 12 experiences slight displacement, the spring 14 expands or contracts, maintaining a seal and structural stability through the contact between the surface pipe 13 and the pump chamber pipe 12. A packer 17 is fixedly connected to the outside of the quartz sand isolation layer 16. A water layer casing 18 is fixedly connected to the bottom of the quartz sand isolation layer 16. A check valve 19 is fixedly connected inside the water layer casing 18. The packer 17 is installed outside the quartz sand isolation layer 16, effectively separating different areas within the geothermal well, preventing fluid cross-contamination, and enabling stratified extraction or well sealing. The check valve 19 inside the water layer casing 18 only allows unidirectional fluid flow, preventing backflow of water layer fluid and maintaining fluid circulation and pressure stability within the well. A movable plate 10 is rotatably connected inside the geothermal well body 1.

[0033] Working Principle: During installation, the sealing cover 2 is first placed outside the geothermal well body 1 and fixed using the locking assembly. The fixing ring 6 is firmly connected to the geothermal well body 1. By pushing the connecting plate 8, the arc-shaped locking block 7 slides within the fixing ring 6, tightly fitting the sealing cover 2 and thus firmly fixing it to prevent displacement. In the sealing assembly, rotating the handle 4 causes the threaded rod 11 to rotate within the sealing plate 9, causing the movable plate 10 to rotate accordingly, thus compressing the internal space of the geothermal well and enhancing the sealing effect. The sealing plate 9 is fixed inside the geothermal well body 1. Rotating the handle 4 can rotate the threaded rod 11, and the pressure relief port 3 can release the pressure inside the geothermal well when necessary, preventing excessive pressure from damaging the entire well sealing device, maintaining pressure balance inside the well, and ensuring safe operation of the device. The cement isolation layer 15 and the quartz sand isolation layer 16 protect and isolate the pump chamber pipeline 12. The cement isolation layer 15 can prevent external substances from entering the area around the pump chamber pipeline 12, while also providing some support and fixation.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A novel sealing device for medium-deep geothermal wells, comprising a geothermal well body (1), characterized in that: A sealing cover (2) is placed on the outside of the geothermal well body (1). A locking assembly is installed on the outside of the sealing cover (2). A threaded rod (11) is rotatably connected inside the sealing cover (2). A sealing assembly is installed on the outside of the threaded rod (11). The locking assembly includes a fixing ring (6), which is fixedly connected to the outside of the geothermal well body (1). A fixing block (5) is fixedly connected to the outside of the fixing ring (6). An arc-shaped locking block (7) is slidably connected inside the fixing ring (6). A connecting plate (8) is fixedly connected to the outside of the arc-shaped locking block (7). The arc-shaped locking block (7) is slidably connected to the inside of the fixing block (5).

2. The novel sealing device for medium-deep geothermal wells according to claim 1, characterized in that: The sealing assembly includes a sealing plate (9), which is fixedly connected inside the geothermal well body (1). The threaded rod (11) is rotatably connected inside the sealing plate (9). A movable plate (10) is fixedly connected to the end of the threaded rod (11), and a rotating handle (4) is fixedly connected to the outside of the threaded rod (11).

3. A novel sealing device for medium-deep geothermal wells according to claim 2, characterized in that: The movable plate (10) is fixedly connected to the outside of a pump chamber pipe (12), the pump chamber pipe (12) is fixedly connected to the outside of a cement isolation layer (15), and a quartz sand isolation layer (16) is fixedly connected to the bottom of the cement isolation layer (15).

4. A novel sealing device for medium-deep geothermal wells according to claim 3, characterized in that: A spring (14) is fixedly connected inside the geothermal well body (1), and a surface pipe (13) is fixedly connected to the outside of the spring (14). The inside of the surface pipe (13) is in contact with the outside of the pump chamber pipe (12).

5. A novel sealing device for medium-deep geothermal wells according to claim 3, characterized in that: The quartz sand isolation layer (16) is externally fixedly connected to a packer (17).

6. A novel sealing device for medium-deep geothermal wells according to claim 3, characterized in that: The bottom of the quartz sand isolation layer (16) is fixedly connected to a water layer sleeve (18), and a check valve (19) is fixedly connected inside the water layer sleeve (18).

7. A novel sealing device for medium-deep geothermal wells according to claim 2, characterized in that: The movable plate (10) is rotatably connected inside the geothermal well body (1).

8. A novel sealing device for medium-deep geothermal wells according to claim 1, characterized in that: The sealing cap (2) has a pressure relief port (3) in the middle.

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