Wellhead protection device of geothermal well

Abstract

The utility model relates to a wellhead protection device of a geothermal well. Comprising a wellhead main body, a recharge cylinder assembly is arranged at the upper end opening of the wellhead main body, and a drain outlet and a water return pipe are connected to the peripheral wall of the recharge cylinder assembly in a communicating mode; at least two sets of installation notches evenly distributed in the circumferential direction are formed in an upper end opening of the well mouth body, and jacking assemblies are arranged in the installation notches and used for being connected with the recharge cylinder assembly and driving the recharge cylinder assembly to ascend and descend. The jacking assembly comprises a driving rack which is movably connected with the bottom of the recharge cylinder assembly and is longitudinally arranged, and further comprises a lifting driving mechanism for driving the driving rack to longitudinally move; a cylinder cover is mounted at a top opening of the recharge cylinder assembly, and a pipe connecting structure matched with the water taking pipe in an inserted manner is mounted in the center of the cylinder cover; and the filter cartridge is arranged in the inner cavity of the recharge cylinder assembly and is used for filtering recharge water. The geothermal well lid opening and supporting device can filter recharge water, rapidly open and support a geothermal well lid, reduce labor intensity, prevent the well lid from inclining and falling, and is simple in structure and convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of reinjection well protection technology, and in particular relates to a geothermal wellhead protection device. Background Technology

[0002] Geothermal energy is an energy source inherent in the Earth itself and is considered a renewable energy source. Geothermal temperatures in the middle and deeper layers are higher than in lower layers, making it suitable for power generation, housing heating, and other applications. Compared to energy sources like coal and oil, geothermal energy has the advantages of being clean and reusable, thus qualifying as a renewable resource.

[0003] Deep groundwater has its own circulation system. After some hot water is pumped up, it is continuously replenished from afar. Therefore, the traditional method of geothermal utilization is to directly extract and use geothermal water. However, due to severe over-extraction of geothermal energy in recent years, geological subsidence and groundwater levels have occurred in some areas. Therefore, while making good use of geothermal water, reinjection is necessary, which means using the "heat extraction without water extraction" technique. This refers to extracting and using the heat from the geothermal source water, but not the geothermal water itself. This method achieves the purpose of obtaining heat while avoiding water level changes caused by excessive extraction of geothermal water. The typical method of "heat extraction without water extraction" is reinjection, which involves extracting heat energy from the geothermal source at the surface, treating the used geothermal water, and then reinjecting it into the aquifer. This improves the regeneration performance of the geothermal water and prevents the aquifer from drying up due to excessive extraction.

[0004] However, most reinjection wells do not filter waste geothermal water before directly injecting it into the ground, leading to serious pollution of the geothermal water. Furthermore, opening and closing the geothermal well cover is essential for downhole inspection and maintenance. Often, the cover is simply hooked up using a cover hook, or supported by bricks or other objects, which frequently results in difficulty in hooking it up and instability in the support. Therefore, there is an urgent need to design a geothermal wellhead protection device to solve these problems. Utility Model Content

[0005] This utility model provides a geothermal wellhead protection device to solve the technical problems existing in the prior art. This utility model can filter the reinjection water and quickly open and support the geothermal well cover, reduce labor intensity, prevent the well cover from falling off, and has a simple structure and is easy to use.

[0006] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A geothermal wellhead protection device includes a wellhead body, a reinjection cylinder assembly is provided at the upper port of the wellhead body, and a drain outlet and a return water pipe are connected to the outer peripheral wall of the reinjection cylinder assembly; at least two sets of installation slots are evenly distributed circumferentially at the upper port of the wellhead body, and a lifting assembly is provided in each installation slot for connecting the reinjection cylinder assembly and driving the reinjection cylinder assembly to move up and down; the lifting assembly includes a drive rack that is movably connected to the bottom of the reinjection cylinder assembly and is arranged longitudinally, and also includes a lifting drive mechanism for driving the drive rack to move longitudinally; a cylinder cover is installed at the top opening of the reinjection cylinder assembly, and a connecting pipe structure that is inserted and matched with the water intake pipe is installed at the center of the cylinder cover; it also includes a filter cylinder installed in the inner cavity of the reinjection cylinder assembly for filtering the reinjection water.

[0007] The advantages and positive effects of this utility model are as follows: This utility model provides a geothermal wellhead protection device. Through the filter cylinder, the water reinjected into the geothermal well can be pre-filtered to avoid contaminating the geothermal water. Through the lifting component, the reinjection cylinder component can be smoothly lifted when maintenance is required, while supporting the reinjection cylinder component. The operation process is simple, that is, only the lifting drive mechanism needs to be operated to drive the lifting component to move up and down, thereby lifting the reinjection cylinder component. There is no need for the staff to manually hook the reinjection cylinder component with the well cover hook, which is convenient for the staff and reduces the labor intensity of the staff.

[0008] Preferably, the lifting drive mechanism includes a drive box disposed in the mounting slot, a rotatably connected turbine component and a worm gear component rotatably connected in the drive box, a rack guide component fixedly connected in the drive box, a drive rack slidingly passing through the rack guide component, and the drive rack meshing with the turbine component; the top of the drive rack passes through the drive box and is fixedly connected to a bent lifting plate component, and the lifting plate component is movably connected to the recharge cylinder assembly.

[0009] Preferably, an operating box is fixedly connected to the top of the drive box, and an operating box cover is pivotally connected to the opening of the operating box. The operating box cover is locked to the operating box, and the upper end of the worm gear extends into the operating box.

[0010] Preferably, the reinjection cylinder assembly includes a wellhead cover with a liquid outlet at the center of the wellhead cover; the reinjection cylinder body is fixedly attached to the top of the wellhead cover; the cover and the reinjection cylinder body are connected by a flange.

[0011] Preferably, a plurality of swivel joints corresponding to a plurality of lifting components are fixedly connected to the bottom of the wellhead cover. A through groove is provided on the swivel joint for the lifting plate to pass through. A gap is left between the swivel joint and the wellhead cover, and a locking pin inserted in the lifting plate is inserted in the gap.

[0012] Preferably, the connecting pipe structure includes a docking pipe arranged coaxially with the reinjection cylinder assembly. The upper end of the docking pipe passes through the cylinder cover and is fixedly connected to it. The lower end of the docking pipe passes through the liquid outlet opened at the center of the wellhead cover and is fixedly connected to a plug sleeve. The docking pipe is connected to the water intake pipe, and the upper end of the water intake pipe is inserted into the plug sleeve.

[0013] Preferably, the lower end of the connecting pipe is inserted into the upper end of the water intake pipe, and a sealing ring is provided between the connecting pipe and the water intake pipe. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of the main body of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the lifting component in this utility model.

[0017] In the diagram: 1. Wellhead body; 2. Water intake pipe; 3. Lifting assembly; 3-1. Drive rack; 3-2. Rack guide; 3-3. Turbine component; 3-4. Drive box; 3-5. Worm gear component; 3-6. Control box; 3-7. Control box cover; 3-8. Lifting plate; 3-9. Locking pin; 4. Mounting slot; 5. Sewage outlet; 6. Filter cartridge; 7. Recharge cartridge assembly; 7-1. Wellhead cover; 7-2. Recharge cartridge body; 7-3. Union; 8. Cylinder cover; 9. Connecting pipe structure; 9-1. Insert sleeve; 9-2. Connecting pipe; 10. Return water pipe. Detailed Implementation

[0018] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0019] Please see Figure 1 The geothermal wellhead protection device of this utility model includes a wellhead body 1, a reinjection cylinder assembly 7 is provided at the upper port of the wellhead body 1, and a drain outlet 5 and a return water pipe 10 are connected to the outer peripheral wall of the reinjection cylinder assembly 7.

[0020] At least two sets of installation slots 4 are evenly distributed circumferentially at the upper end of the wellhead body 1. Each installation slot 4 is equipped with a lifting component 3 for connecting the reinjection cylinder assembly 7 and driving the reinjection cylinder assembly 7 to move up and down. A cylinder cover 8 is installed at the top opening of the reinjection cylinder assembly 7. A connecting pipe structure 9 that is inserted and matched with the water intake pipe 2 is installed at the center of the cylinder cover 8. It also includes a filter cylinder 6 installed in the inner cavity of the reinjection cylinder assembly 7 for filtering the reinjection water.

[0021] See further Figure 2In this embodiment, the aforementioned lifting assembly 3 is provided in four sets. The lifting assembly 3 includes a drive rack 3-1 that is movably connected to the bottom of the recharge cylinder assembly 7 and is arranged longitudinally, and also includes a lifting drive mechanism for driving the drive rack 3-1 to move longitudinally; wherein, the aforementioned lifting drive mechanism includes a drive box 3-4 provided in the mounting slot 4, a turbine component 3-3 and a worm component 3-5 that are rotatably connected in the drive box 3-4, a rack guide component 3-2 that is fixedly connected in the drive box 3-4, the drive rack 3-1 slidingly passing through the rack guide component 3-2, and the drive rack 3-1 meshing with the turbine component 3-3; the top of the drive rack 3-1 passes through the drive box 3-4 and is fixedly connected to a bent lifting plate component 3-8, and the lifting plate component 3-8 is movably connected to the recharge cylinder assembly 7.

[0022] Additionally, an operating box 3-6 is fixedly connected to the top of the drive box 3-4, and an operating box cover 3-7 is pivotally connected to the opening of the operating box 3-6. The operating box cover 3-7 is locked to the operating box 3-6, and the upper end of the worm gear 3-5 extends into the operating box 3-6. In actual operation, the operating box 3-6 and the operating box cover 3-7 are connected by a latch.

[0023] like Figure 2 As shown, the aforementioned reinjection cylinder assembly 7 includes a wellhead cover 7-1 with a liquid outlet at its center; a reinjection cylinder body 7-2 is fixedly attached to the top of the wellhead cover 7-1; a cylinder cover 8 is connected to the reinjection cylinder body 7-2 via a flange. An installation ring is fixedly attached to the upper part of the inner cavity of the reinjection cylinder body 7-2, and the top of the filter cylinder 6 is connected to the installation ring via bolts. The aforementioned return water pipe 10 is installed on the upper part of the reinjection cylinder body 7-2, and the drain outlet 5 is installed on the lower part of the reinjection cylinder body 7-2. The cylinder cover 8 is connected to the reinjection cylinder body 7-2 via a flange.

[0024] See further Figure 3 At the bottom of the wellhead cover 7-1, there are multiple sets of movable joints 7-3 that correspond one-to-one with multiple sets of lifting components 3. The movable joints 7-3 have through slots through which the lifting plate 3-8 can pass. A gap is left between the movable joints 7-3 and the wellhead cover 7-1, and a locking pin 3-9 inserted into the lifting plate 3-8 is inserted into the gap.

[0025] like Figure 2 As shown, the aforementioned connecting pipe structure 9 includes a docking connecting pipe 9-2 coaxially arranged with the reinjection cylinder assembly 7. The upper end of the docking connecting pipe 9-2 passes through the cylinder cover 8 and is fixedly connected to it. The lower end of the docking connecting pipe 9-2 passes through the outlet port opened at the center of the wellhead cover 7-1 and is fixedly connected to a plug sleeve 9-1. The docking connecting pipe 9-2 is connected to the water intake pipe 2, and the upper end of the water intake pipe 2 is inserted into the plug sleeve 9-1. The lower end of the docking connecting pipe 9-2 is inserted into the upper end of the water intake pipe 2. A sealing ring is provided between the docking connecting pipe 9-2 and the water intake pipe 2.

[0026] Working principle:

[0027] In actual operation, under the action of the water pump, the geothermal water is lifted to the ground through the water intake pipe 2 and the connecting pipe structure 9 and used. The geothermal water that has been used is poured into the reinjection cylinder assembly 7 through the return water pipe 10. The reinjection water flowing into the reinjection cylinder assembly 7 is filtered by the filter cylinder 6. The filtered reinjection water flows into the geothermal well through the outlet on the well cover 7-1.

[0028] When maintenance is required, open the control box cover 3-7, and then manually rotate the worm gear 3-5, which in turn drives the turbine 3-3 to rotate. The rotating turbine 3-3 can drive the drive rack 3-1 that meshes with it to move longitudinally. The drive rack 3-1 moves upward, which can lift the recharge cylinder assembly 7 upward. In actual work, at least two workers need to operate the above-mentioned multiple rotating worm gears 3-5 at the same time to smoothly lift the recharge cylinder assembly 7.

[0029] After the recharge cylinder assembly 7 is lifted and moved to a suitable position, it will be convenient for staff to carry out maintenance. When it is necessary to remove the recharge cylinder assembly 7, the locking pin 3-9 inserted on the lifting plate 3-8 can be pulled out, thus making it convenient to remove the recharge cylinder assembly 7.

Claims

1. A geothermal wellhead protector characterized by: The wellhead includes a main body (1), a reinjection cylinder assembly (7) is provided at the upper end of the main body (1), and a drain outlet (5) and a return water pipe (10) are connected to the outer peripheral wall of the reinjection cylinder assembly (7); at least two sets of installation slots (4) are evenly distributed circumferentially at the upper end of the main body (1), and a lifting assembly (3) is provided in each installation slot (4) for connecting the reinjection cylinder assembly (7) and driving the reinjection cylinder assembly (7) to move up and down; the lifting assembly The component (3) includes a drive rack (3-1) that is movably connected to the bottom of the recharge cylinder assembly (7) and is arranged longitudinally, and also includes a lifting drive mechanism for driving the drive rack (3-1) to move longitudinally; a cylinder cover (8) is installed at the top opening of the recharge cylinder assembly (7), and a connecting pipe structure (9) that is inserted and matched with the water intake pipe (2) is installed at the center of the cylinder cover (8); it also includes a filter cylinder (6) installed in the inner cavity of the recharge cylinder assembly (7) for filtering the recharge water.

2. The geothermal wellhead protection device as described in claim 1, characterized in that: The lifting drive mechanism includes a drive box (3-4) set in the mounting slot (4), a turbine component (3-3) and a worm component (3-5) rotatably connected in the drive box (3-4), a rack guide component (3-2) fixed in the drive box (3-4), a drive rack (3-1) slidingly passing through the rack guide component (3-2), and the drive rack (3-1) meshing with the turbine component (3-3); the top of the drive rack (3-1) passes through the drive box (3-4) and is fixedly connected with a bent lifting plate component (3-8), and the lifting plate component (3-8) is movably connected to the recharge cylinder assembly (7).

3. A geothermal wellhead protector as defined in claim 2 wherein An operating box (3-6) is fixedly connected to the top of the drive box (3-4). An operating box cover (3-7) is pivotally connected to the opening of the operating box (3-6). The operating box cover (3-7) is locked to the operating box (3-6). The upper end of the worm gear (3-5) extends into the operating box (3-6).

4. The geothermal wellhead protector of claim 2 wherein: The reinjection cylinder assembly (7) includes a wellhead cover (7-1) with an outlet at the center of the wellhead cover (7-1); a reinjection cylinder body (7-2) is fixedly attached to the top of the wellhead cover (7-1); the cylinder cover (8) and the reinjection cylinder body (7-2) are connected by a flange.

5. A geothermal wellhead protector as defined in claim 4 wherein the The bottom of the well cover (7-1) is fixed with multiple sets of movable joints (7-3) that correspond one-to-one with multiple sets of lifting components (3). A through groove is provided on the movable joint (7-3) for the lifting plate (3-8) to pass through. A gap is left between the movable joint (7-3) and the well cover (7-1), and a locking pin (3-9) inserted in the gap is inserted into the lifting plate (3-8).

6. The geothermal wellhead protector of claim 4 wherein: The connecting pipe structure (9) includes a connecting pipe (9-2) coaxially arranged with the reinjection cylinder assembly (7). The upper end of the connecting pipe (9-2) passes through the cylinder cover (8) and is fixedly connected to it. The lower end of the connecting pipe (9-2) passes through the outlet at the center of the wellhead cover (7-1) and is fixedly connected to the insertion sleeve (9-1). The connecting pipe (9-2) is connected to the water intake pipe (2), and the upper end of the water intake pipe (2) is inserted into the insertion sleeve (9-1).

7. A geothermal wellhead protector according to claim 6, characterised in that: The lower end of the connecting pipe (9-2) is inserted into the upper end of the water intake pipe (2), and a sealing ring is provided between the connecting pipe (9-2) and the water intake pipe (2).

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