A geothermal well system and geothermal collection method

Abstract

The present invention relates to the field of geothermal utilization technology, and in particular to a geothermal well system and a geothermal collection method, comprising an insulation pipe, a water pump, a geothermal heat pump unit and a water pumping well, wherein the insulation pipe is coaxially arranged in the water pumping well, and a water inlet hole is arranged on the side of the lower end of the insulation pipe so that well water can enter the insulation pipe; the water pump is arranged in the insulation pipe, and is used to pump the well water in the insulation pipe into the geothermal heat pump unit; the present invention arranges one end of a hole cleaning component to slide back and forth up and down in a water filter hole to push the silt in the water filter hole into a first water inlet channel, so that the filter component is not easily blocked by the silt in the well, thereby ensuring the efficiency of pumping water. At the same time, the system can perform two sedimentations and four filtrations on the well water, so that the well water entering the geothermal heat pump unit is relatively clean and is not easy to cause blockage to the geothermal heat pump unit, which is beneficial to the normal operation of the system and makes the maintenance cost and energy consumption of the system low.

Description

Technical Field

[0001] The present invention relates to the field of geothermal utilization technology, and in particular to a geothermal well system and a geothermal collection method. Background Art

[0002] Geothermal wells are one of the direct ways to utilize geothermal energy. They use heat pump technology to convert low-level heat energy in the soil or water in the well into high-level heat energy that can be used for both heating and cooling. For example, CN111750405A discloses an enhanced geothermal heating system.

[0003] Specifically, when the geothermal well system is working, the groundwater is first purified by the filter, then enters the heat pump unit, and exchanges heat with the condenser or evaporator of the main unit. In summer, the groundwater absorbs heat from the condenser to produce high-temperature hot water; in winter, the evaporator absorbs heat from the groundwater to produce low-temperature cold water. After the heat exchange, the groundwater is completely recharged into the same aquifer to achieve the recycling of water resources.

[0004] During actual operation, the filter in the well is often easily clogged by mud and sand particles, resulting in reduced pumping efficiency or even complete blockage of water flow. When the filter is clogged, it will not only affect the normal operation of the system, but also increase maintenance costs and energy consumption. Summary of the invention

[0005] In view of this, the present invention proposes a geothermal well system and a geothermal collection method, which arranges one end of a hole cleaning component to slide back and forth up and down in a water filter hole to remove the silt in the water filter hole, so that the filter component is not easily blocked by the silt in the well, thereby ensuring the efficiency of pumping water. At the same time, the system can perform two sedimentations and four filtrations on the well water, so that the well water entering the geothermal heat pump unit is relatively clean and is not easy to cause blockage to the geothermal heat pump unit, which is beneficial to the normal operation of the system and reduces the maintenance cost and energy consumption of the system.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In one aspect, the present invention provides a geothermal well system, comprising an insulation pipe, a water pump, a geothermal heat pump unit and a water pump well, wherein:

[0008] The insulation pipe is coaxially arranged in the pumping well, and a water inlet hole is arranged on the side of the lower end of the insulation pipe so that well water can enter the insulation pipe;

[0009] The water pump is arranged in the insulation pipe, and is used to pump the well water in the insulation pipe to the ground source heat pump unit;

[0010] It also includes a filtering component and a hole cleaning component, wherein:

[0011] The filter assembly is placed vertically in the insulation pipe, a first water inlet channel is formed between the side of the filter assembly and the side of the insulation pipe, the upper end of the first water inlet channel is closed, and a water filter hole is provided on the side of the filter assembly and near the water inlet hole;

[0012] The hole cleaning component is arranged inside the filter component, and one end of the hole cleaning component is used to slide reciprocally up and down in the water filter hole to remove the mud and sand in the water filter hole.

[0013] On the basis of the above technical solution, preferably, it also includes a reinjection well and a pressure pump, wherein:

[0014] The booster pump is arranged at the recharging well;

[0015] The water inlet of the booster pump is connected to the ground source heat pump unit through a pipeline, and the water outlet of the booster pump is connected to the recharging well through a pipeline.

[0016] On the basis of the above technical solution, preferably, it also includes a filter screen,

[0017] The filter screen is detachably arranged inside the wellhead of the reinjection well.

[0018] On the basis of the above technical solution, preferably, the lower end of the insulation pipe is closed.

[0019] On the basis of the above technical solution, preferably, the thermal insulation pipe comprises an inner pipe, an outer pipe, a thermal insulation material and an end cover, wherein:

[0020] The inner tube is sleeved inside the outer tube, an inner cavity is formed between the inner tube and the outer tube, and the inner cavity is filled with the heat insulation material;

[0021] The end cover is screwed to the lower end of the inner tube.

[0022] On the basis of the above technical solution, preferably, the water pump is arranged on the inner side of the filter assembly, and the water pump is connected to the ground source heat pump unit through a pipeline.

[0023] On the basis of the above technical solution, preferably, the filter assembly includes an outer cylinder, an inner cylinder, a hook and sand, wherein:

[0024] The upper ends of the outer tube and the inner tube are open, and the lower ends are closed. The hook is fixedly arranged at the upper end of the outer tube. A first outer flange is arranged on the side of the upper end of the outer tube. An inner flange is arranged on the inner wall of the thermal insulation pipe at a position corresponding to the first outer flange. The first outer flange is placed on the top of the inner flange and abuts against each other. The upper end of the first water inlet channel forms a closed structure through the abutment of the first outer flange and the inner flange.

[0025] The inner cylinder is arranged at the inner bottom of the outer cylinder, the sand material is filled inside the inner cylinder, a second outer flange is arranged on the side of the upper end of the inner cylinder, the side of the second outer flange is fixedly connected to the inner wall of the outer cylinder, and the upper end of the second water inlet channel forms a closed structure through the second outer flange;

[0026] A second water inlet channel is formed between the side of the inner cylinder and the side of the outer cylinder, and a receiving cavity is formed between the bottom of the inner cylinder and the bottom of the outer cylinder;

[0027] The water filter hole comprises a first water hole and a second water hole, wherein the first water hole is opened on the side wall of the outer cylinder, and the second water hole is opened on the side wall of the inner cylinder, and the upper and lower ends of the first water hole and the second water hole are both wedge-shaped, so that the water inlet port diameter of the first water hole and the second water hole is larger than the water outlet port diameter;

[0028] One end of the hole cleaning component is arranged in the accommodating cavity, and the other end is arranged in the second water inlet channel. One end of the hole cleaning component arranged in the second water inlet channel is vertically slidably arranged in the first water hole and the second water hole.

[0029] On the basis of the above technical solution, preferably, the sand material includes gravel pebbles and fine sand, wherein:

[0030] The gravel pebbles and the powdered fine sand are laid in the inner tube in one layer from bottom to top.

[0031] On the basis of the above technical solution, preferably, the hole cleaning assembly includes a moving ring, a first shovel plate, a second shovel plate, a telescopic rod, a lifting seat and a support rod, wherein:

[0032] The movable ring is sleeved on the inner cylinder and is slidably connected;

[0033] The first shovel plate and the second shovel plate are in the shape of an isosceles triangle, and the vertex angle of the isosceles triangle is perpendicular to the inner wall of the insulation pipe, one end of the first shovel plate is fixed to the outer side of the movable ring, and the other end is slidably arranged in the first water hole, and one end of the second shovel plate is fixed to the inner side of the movable ring, and the other end is slidably arranged in the second water hole;

[0034] The telescopic rod is vertically fixedly arranged at the bottom of the accommodating cavity, and the output end of the telescopic rod is fixedly connected to the lifting seat;

[0035] One end of the support rod is fixedly connected to the lifting seat, and the other end is fixedly connected to the moving ring.

[0036] On the other hand, the present invention also provides a geothermal collection method, using the above-mentioned geothermal well system, comprising the following steps:

[0037] S1. Drilling the pumping well using a drilling machine, and making the bottom of the pumping well below the confined aquifer, and then inserting one end of the insulation pipe having the water inlet hole into the well, and making the inserted end of the insulation pipe abut against the bottom of the pumping well, and making the water inlet hole in the confined aquifer;

[0038] S2, filling the sand material in the inner tube, and then placing the filter assembly into the insulation pipe through a rope. After the filter assembly is in place, the water pump and the ground source heat pump unit are connected through a pipeline, and then the water pump is placed into the insulation pipe through a rope and maintained at the height of placement;

[0039] S3, the water in the confined aquifer passes through the water inlet hole and enters the first water inlet channel for the first sedimentation. During the process, the water inlet hole performs the first filtration of the sediment in the water;

[0040] S4, the water in the first water inlet channel enters the second water inlet channel through the first water hole, and is precipitated for the second time in the accommodating chamber. During the process, the first water hole filters the sediment in the water for the second time;

[0041] S5, the water in the second water inlet channel enters the filter assembly through the second water hole, and is filtered in layers by the sand material. During the process, the second water hole filters the sediment in the water for the third time, and the sand material filters the sediment in the water for the fourth time;

[0042] S6, the water filtered by the sand material rises and enters the insulation pipe, is extracted by the water pump and pumped to the ground source heat pump unit for use, completing the collection of geothermal heat;

[0043] S7. During the pumping process, the telescopic rod drives the lifting seat to move up and down reciprocatingly, and the lifting seat pulls the first shovel plate and the second shovel plate on the movable ring to move up and down reciprocatingly through the support rod to dredge the first water hole and the second water hole to keep the first water hole and the second water inlet channel unobstructed.

[0044] The geothermal well system and geothermal collection method of the present invention have the following beneficial effects compared with the prior art:

[0045] (1) One end of the hole cleaning component is set to slide back and forth up and down in the water filter hole to remove the silt in the water filter hole, so that the filter component is not easily blocked by the silt in the well, thereby ensuring the efficiency of pumping water, facilitating the normal operation of the system, and reducing the maintenance cost and energy consumption of the system.

[0046] (2) By setting up a sedimentation structure and a filtration structure, the system can perform two sedimentations and four filtrations on the well water, making the well water entering the ground source heat pump unit relatively clean and less likely to cause blockage of the ground source heat pump unit, which is beneficial to the normal operation of the system and reduces the maintenance cost and energy consumption of the system.

[0047] (3) By providing the first shovel plate and the second shovel plate in a triangular shape, and by providing the first water hole and the second water hole in a wedge shape at both upper and lower ends, so that the water inlet port diameter of the first water hole and the second water hole is larger than the water outlet port diameter, the mud and sand can be cleaned up more easily by the first shovel plate and the second shovel plate, and the process is smoother. The telescopic rod drives the first shovel plate and the second shovel plate to move synchronously, so that the up and down sliding of the first shovel plate and the second shovel plate is more stable, thereby improving the effect of cleaning the mud and sand.

[0048] (4) By providing an end cover screwed to the lower end of the outer tube and providing a removable bottom cover at the bottom of the outer tube, it is convenient to clean the sediment settled at the bottom of the insulation tube and the outer tube, and it is also convenient to install and replace the telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 A layout diagram of a geothermal well system of the present invention;

[0051] Figure 2 For the present invention Figure 1 A magnified image of point A;

[0052] Figure 3 For the present invention Figure 1 A magnified view of point B;

[0053] Figure 4 It is a three-dimensional diagram of the thermal insulation pipe of the present invention;

[0054] Figure 5 It is a partial longitudinal cross-sectional view of the thermal insulation pipe of the present invention;

[0055] Figure 6 For the present invention Figure 3 Schematic diagram of the local structure;

[0056] Figure 7 For the present invention Figure 6 Enlarged view of point C;

[0057] Figure 8 A partial stereoscopic view of the filter assembly of the present invention;

[0058] Fig. 9 It is a partial stereoscopic view of the inner cylinder of the present invention;

[0059] In the figure: 1, insulation pipe; 2, water pump; 3, ground source heat pump unit; 4, water well; 5, filter assembly; 6, hole cleaning assembly; 7, recharging well; 8, booster pump; 9, filter screen; 11, inner tube; 12, outer tube; 13, insulation material; 14, end cover; 51, outer tube; 52, inner tube; 53, hook; 54, sand material; 61, moving ring; 62, first shovel plate; 63, second shovel plate; 64 , telescopic rod; 65, lifting seat; 66, supporting rod; 101, water inlet hole; 102, first water inlet channel; 103, inner cavity; 104, inner flange; 501, water filter hole; 502, first outer flange; 503, second outer flange; 504, second water inlet channel; 505, accommodating chamber; 541, gravel and pebbles; 542, fine sand; 5011, first water hole; 5012, second water hole. DETAILED DESCRIPTION

[0060] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] like Figure 1-9 As shown, a geothermal well system of the present invention includes an insulation pipe 1, a water pump 2, a geothermal heat pump unit 3, a water pump 4, a filter component 5, a hole cleaning component 6, a recharging well 7 and a pressure pump 8.

[0062] The insulation pipe 1 is coaxially arranged in the pumping well 4, and the lower end of the insulation pipe 1 is closed. The pumping well 4 is drilled by a drilling machine. Figure 1 As shown, the well wall is composed of non-aquifer one, non-aquifer two, non-aquifer three, aquifer and impermeable layer from top to bottom. The bottom of the pumping well 4 is below the pressure aquifer, that is, in the impermeable layer. After the insulation pipe 1 is inserted into the pumping well 4, the lower end of the insulation pipe 1 is against the bottom of the well. A water inlet hole 101 is provided on the side of the lower end of the insulation pipe 1. The water inlet hole 101 is located in the aquifer so that well water can enter the insulation pipe 1. At the same time, the insulation pipe 1 functions to maintain the structure of the well wall and prevent the well wall from collapsing. The water inlet hole 101 on the insulation pipe 1 is a coarse-effect filter hole with a pore size larger than that of the filter hole 501, and is used to filter large particles of sediment.

[0063] The water pump 2 is arranged in the insulation pipe 1, and one end of the water suction port of the water pump 2 is arranged on the inner side of the filter assembly 5, which is used to pump the well water in the insulation pipe 1 to the ground source heat pump unit 3. Specifically, the water inlet end of the water pump 2 is below the pressure water level of the pumping well 4 and is on the inner side of the outer tube 51, which is used to extract groundwater, that is, the well water flows into the insulation pipe 1 from the water inlet hole 101 under pressure, and then enters the outer tube 51 and the insulation pipe 1 above the outer tube 51 for storage after being filtered by the filter assembly 5. The water inlet end of the water pump 2 is in the outer tube 51, so that the water inlet end of the water pump 2 is deep in the well water, which is used to better extract well water for use by the ground source heat pump unit 3.

[0064] The filter assembly 5 is placed vertically in the insulation pipe 1, and a first water inlet channel 102 is formed between the side of the filter assembly 5 and the side of the insulation pipe 1. The upper end of the first water inlet channel 102 is closed, and a water filter hole 501 is provided on the side of the filter assembly 5 and near the water inlet hole 101; specifically, the well water entering the insulation pipe 1 from the water inlet hole 101 is first filtered by the filter assembly 5 and then stored in the insulation pipe 1 after rising to the pressurized water level.

[0065] The hole cleaning component 6 is arranged inside the filter component 5, and one end of the hole cleaning component 6 is used to slide back and forth up and down in the water filter hole 501 to remove the silt in the water filter hole 501; specifically, during the pumping process, one end of the hole cleaning component 6 is used to slide back and forth up and down in the water filter hole 501 to remove the silt in the water filter hole 501 to prevent blockage, and the cleaned silt sinks to the inside of the lower end of the insulation pipe 1 and settles. By cleaning the silt, the filter component 5 is not easily blocked by the silt in the well, thereby ensuring the efficiency of pumping, being beneficial to the normal operation of the system, and making the maintenance cost and energy consumption of the system low.

[0066] The booster pump 8 is arranged at the recharge well 7; the water inlet of the booster pump 8 is connected to the ground source heat pump unit 3 through a pipeline, and the water outlet of the booster pump 8 is connected to the recharge well 7 through a pipeline; specifically, the wastewater after heat exchange with the ground source heat pump unit 3 is pressurized by the booster pump 8 and pumped to the recharge well 7, so that the water is recharged into the ground.

[0067] like Figure 1 As shown, a detachable filter screen 9 is provided inside the wellhead of the reinjection well 7 to filter out debris in the water, so that the reinjected well water is cleaner, which is beneficial to the protection of groundwater.

[0068] like Figure 5 As shown, the above-mentioned thermal insulation pipe 1 includes an inner pipe 11, an outer pipe 12, an insulating material 13 and an end cover 14, wherein the inner pipe 11 is sleeved inside the outer pipe 12, an inner cavity 103 is formed between the inner pipe 11 and the outer pipe 12, and the inner cavity 103 is filled with the insulating material 13; the end cover 14 is screwed to the lower end of the inner pipe 11.

[0069] In the above structure, the lower end of the insulation pipe 1 is closed by the end cover 14. After closing, the interior of the lower end of the insulation pipe 1 can be used to settle mud and sand. Since the end cover 14 is screwed to the lower end of the inner tube 11, the end cover 14 can be removed from the lower end of the inner tube 11. During later maintenance, the insulation pipe 1 is pulled out from the inside, and then the end cover 14 is removed, which makes it convenient to clean the mud and sand settled in the insulation pipe 1.

[0070] In addition, when drilling a hole on the side of the insulation pipe 1, a drilling tool is used to drill the water inlet hole 101. When drilling, the drill bit is tilted upward so that the outer hole opening of the water inlet hole 101 after drilling is lower than the inner hole opening, thereby making it difficult for mud and sand to fall into the water inlet hole 101. At the same time, multiple layers of stainless steel metal mesh are wrapped around the lower end of the insulation pipe 1 to protect the water inlet hole 101, which is beneficial to the anti-blocking protection of the hole.

[0071] like Figure 1 As shown, the water pump 2 is arranged above the filter assembly 5, and the water pump 2 is connected to the ground source heat pump unit 3 through a pipeline. At the same time, the water pump 2 is connected to the wellhead of the pumping well 4 through a rope so that the water pump 2 is stably hoisted in the pumping well 4.

[0072] In a geothermal well system of the present invention, the filter component 5 has sedimentation and filtering capabilities, and cooperates with the installation structure of the insulation pipe 1 to perform two sedimentations and four filtrations on the well water, so that the well water entering the geothermal heat pump unit is relatively clean and not easy to cause blockage to the geothermal heat pump unit 3, which is beneficial to the normal operation of the system and reduces the maintenance cost and energy consumption of the system; specifically, the filter component 5 includes an outer cylinder 51, an inner cylinder 52, a hook 53 and sand 54.

[0073] Among them, Figure 2-3 As shown, the upper ends of the outer tube 51 and the inner tube 52 are open and the lower ends are closed, a hook 53 is fixedly arranged at the upper end of the outer tube 51, a first outer flange 502 is arranged on the side of the upper end of the outer tube 51, an inner flange 104 is arranged on the inner wall of the insulation pipe 1 and at a position corresponding to the first outer flange 502, the first outer flange 502 is placed on the top of the inner flange 104 and abut against each other, and the upper end of the first water inlet channel 102 forms a closed structure through the abutment of the first outer flange 502 and the inner flange 104.

[0074] In the above structure, the hook 53 is used to cooperate with the hanger to facilitate the installation of the filter assembly 5. A sealing gasket is arranged between the first outer flange 502 and the inner flange 104. The filter assembly 5 clamps the sealing gasket between the first outer flange 502 and the inner flange 104 by its own weight to form a sealing structure.

[0075] The interior of the lower end of the outer cylinder 51 is used for settling silt and installing the hole cleaning component 6. The lower end of the inner cylinder 52 is closed and is used to fill sand material 54, wherein the sand material 54 includes gravel pebbles 541 and fine sand 542. The gravel pebbles 541 and the fine sand 542 are laid in the inner cylinder 52 in one layer from bottom to top. In order to prevent the sand material 54 from being lost, at least one circle of stainless steel metal mesh is provided on the inner side wall of the inner cylinder 52 to realize side sand protection. At least one layer of stainless steel metal mesh is also provided between the gravel pebbles 541 and the fine sand 542 to separate the gravel pebbles 541 and the fine sand 542 to prevent the gravel pebbles 541 and the fine sand 542 from mixing with each other.

[0076] The diameter and gradation of the sand material 54 need to be calculated on site according to the drilling site. The calculation formula is the calculation formula in the technical specification of the pipe well: D 50 =(6~8)d 50 , where D 50 The maximum particle diameter when the cumulative sieved mass is 50% in the sieved sample particle composition, d 50 It is the maximum particle diameter when the cumulative sieved mass is 50% in the particle composition of the sieved sample of the sandy soil aquifer. Taking the pore and fissure aquifer in the Jianghan Plain as an example, in the actual construction process, the integrity of the gravel soil sampling is poor and the sampling representativeness is not strong, so it is difficult to obtain d 50 Accurate data, and then calculate d 50 It is quite different from the real stratum and cannot command production well. Therefore, in order to ensure effective filtration, the laying thickness of the sand material 54 in the filter component 5 is uniformly 200mm, among which the particle size of the gravel and pebble 541 is 1-3mm, and the particle size of the fine sand 542 is 0.2-0.5mm.

[0077] like Figure 6 As shown, a second water inlet channel 504 is formed between the side of the inner cylinder 52 and the side of the outer cylinder 51, and a receiving chamber 505 is formed between the bottom of the inner cylinder 52 and the bottom of the outer cylinder 51; the inner cylinder 52 is arranged at the inner bottom of the outer cylinder 51, and a second outer flange 503 is arranged on the side of the upper end of the inner cylinder 52, and the side of the second outer flange 503 is fixedly connected to the inner wall of the outer cylinder 51, and the upper end of the second water inlet channel 504 forms a closed structure through the second outer flange 503; at the same time, as shown Figure 6 As shown, the water filter hole 501 includes a first water hole 5011 and a second water hole 5012, wherein the first water hole 5011 is opened on the side wall of the outer cylinder 51, and the second water hole 5012 is opened on the side wall of the inner cylinder 52, and the first water hole 5011 and the second water hole 5012 are both vertically arranged in a rectangular shape, and the upper and lower ends of the first water hole 5011 and the second water hole 5012 are wedge-shaped, so that the water inlet port diameter of the first water hole 5011 and the second water hole 5012 is larger than the water outlet port diameter, thereby forming a tapered hole for the first water hole 5011 and the second water hole 5012.

[0078] In the above structure, when the well water enters the first water inlet channel 102 from the water inlet hole 101, the well water in the first water inlet channel 102 enters the second water inlet channel 504 from the first water hole 5011, and then enters the inner tube 52 from the second water hole 5012, and then enters the insulation tube 1 from the upper end of the inner tube 52 after being filtered by the sand material 54.

[0079] like Figure 6 As shown, one end of the hole cleaning component 6 is arranged in the accommodating cavity 505, and the other end is arranged in the second water inlet channel 504. One end of the hole cleaning component 6 arranged in the second water inlet channel 504 is vertically slidably arranged in the first water hole 5011 and the second water hole 5012. During the water pumping process, the first water hole 5011 and the second water hole 5012 are cleaned by the hole cleaning component 6 to prevent blockage; specifically, the hole cleaning component 6 includes a movable ring 61, a first shovel plate 62, a second shovel plate 63, a telescopic rod 64, a lifting seat 65 and a support rod 66.

[0080] Among them, Figure 8 As shown, the moving ring 61 is an annular structure, which is sleeved on the inner cylinder 52 and slidably connected. When the telescopic rod 64 is extended or retracted, the moving ring 61 slides on the inner cylinder 52.

[0081] like Fig. 9 As shown, the first shovel plate 62 and the second shovel plate 63 are in the shape of an isosceles triangle, and the vertex angle of the isosceles triangle is perpendicular to the inner wall of the insulation pipe 1, one end of the first shovel plate 62 is fixed on the outer side of the movable ring 61, and the other end is slidably arranged in the first water hole 5011, and one end of the second shovel plate 63 is fixed on the inner side of the movable ring 61, and the other end is slidably arranged in the second water hole 5012; that is, one end of the top angle of the first shovel plate 62 is slidably arranged in the first water hole 5011, and one end of the bottom angle is fixed on the outer side of the movable ring 61, and one end of the top angle of the second shovel plate 63 is fixed on the inner side of the movable ring 61, and one end of the bottom angle is slidably arranged in the second water hole 5012.

[0082] When the movable ring 61 moves up and down, the first shovel plate 62 cleans the mud and sand in the first water hole 5011, and the second shovel plate 63 cleans the mud and sand in the second water hole 5012. Affected by the triangular shape and the hole shape of the first water hole 5011 and the second water hole 5012, the first water hole 5011 and the second water hole 5012 always maintain a tapered hole state, that is, the water inlet port diameter of the first water hole 5011 and the second water hole 5012 is always larger than the water outlet port diameter. Therefore, the mud and sand in the first water hole 5011 and the second water hole 5012 can be easily separated from the corresponding holes, so that the mud and sand in the first water hole 5011 and the second water hole 5012 can be easily cleaned by the corresponding first shovel plate 62 and the second shovel plate 63.

[0083] like Figure 8 As shown, the telescopic rod 64 is any electric telescopic rod in the prior art, such as a waterproof electric telescopic rod disclosed in CN208106906U. In this embodiment, the telescopic rod 64 is vertically fixed at the bottom of the accommodating cavity 505, and the output end of the telescopic rod 64 is fixedly connected to the lifting seat 65. The lifting seat 65 is a conical cylindrical structure, so that mud and sand are not easily deposited on the top of the lifting seat 65. When the telescopic rod 64 is extended or retracted, the lifting seat 65 is driven to rise and fall.

[0084] One end of the support rod 66 is fixedly connected to the lifting seat 65, and the other end is fixedly connected to the moving ring 61. Figure 8 As shown, at least two support rods 66 are provided along the circumference of the lifting seat 65 . When the lifting seat 65 is raised or lowered, the support rods 66 move in the second water inlet channel 504 .

[0085] In addition, a detachable bottom cover is provided at the bottom of the outer cylinder 51 , the bottom cover and the outer cylinder 51 are threadedly connected, and the telescopic rod 64 is fixed to the bottom cover by bolts, which penetrate from the bottom of the bottom cover and are threadedly connected to the bottom end of the telescopic rod 64 .

[0086] The above-mentioned geothermal well system is used for geothermal collection, and includes the following steps:

[0087] S1. Use a drilling machine to drill a pumping well 4, and make the bottom of the pumping well 4 below the confined aquifer, then insert one end of the insulation pipe 1 with the water inlet hole 101 into the well, and make the inserted end of the insulation pipe 1 against the bottom of the pumping well 4, and make the water inlet hole 101 in the confined aquifer; use a drilling machine to drill a recharge well 7, and place a filter screen 9 in the recharge well 7, fix the booster pump 8 on the ground near the recharge well 7, and then connect the booster pump 8 and the recharge well 7 through a pipeline, and at the same time connect the booster pump 8 and the ground source heat pump unit 3 through a pipeline;

[0088] S2. Fill the inner tube 52 with sand 54, and then put the filter assembly 5 into the insulation pipe 1 through a rope. After the filter assembly 5 is in place, connect the water pump 2 and the ground source heat pump unit 3 through a pipeline, and then put the water pump 2 into the insulation pipe 1 through a rope and keep it at the height of insertion, wherein one end of the rope is always fixed on the hook 53 of the filter assembly 5, and the other end is fixed on the wellhead, so that the filter assembly 5 can be taken out of the insulation pipe 1 through the rope later, which is convenient for maintenance;

[0089] S3, the water in the confined aquifer passes through the water inlet hole 101 and enters the first water inlet channel 102 for the first sedimentation. During the process, the water inlet hole 101 performs the first filtration of the sediment in the water;

[0090] S4, the water in the first water inlet channel 102 enters the second water inlet channel 504 through the first water hole 5011, and undergoes a second sedimentation in the accommodating chamber 505. During the process, the first water hole 5011 performs a second filtration on the sediment in the water;

[0091] S5, the water in the second water inlet channel 504 enters the filter assembly 5 through the second water hole 5012, and is filtered in layers by the sand material 54. During the process, the second water hole 5012 filters the sediment in the water for the third time, and the sand material 54 filters the sediment in the water for the fourth time;

[0092] S6, the water filtered by the sand material 54 rises and enters the insulation pipe 1, is extracted by the water pump 2 and pumped to the ground source heat pump unit 3 for use, completing the collection of geothermal energy, and the wastewater after heat exchange with the ground source heat pump unit 3 enters the recharging well 7 along the pipeline to complete the recharging of the well water;

[0093] S7. During the pumping process, the telescopic rod 64 drives the lifting seat 65 to move up and down, and the lifting seat 65 pulls the first shovel plate 62 and the second shovel plate 63 on the movable ring 61 to move up and down through the support rod 66 to clear the first water hole 5011 and the second water hole 5012, and keep the first water hole 5011 and the second water inlet channel 504 unobstructed.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A geothermal heat well system, comprising an insulation pipe (1), a water pump (2), a geothermal heat pump unit (3) and a water pump well (4), wherein: The insulation pipe (1) is coaxially arranged in the pumping well (4), and a water inlet hole (101) is arranged on the side of the lower end of the insulation pipe (1) so that well water can enter the insulation pipe (1); The water pump (2) is arranged in the insulation pipe (1) and is used to pump the well water in the insulation pipe (1) into the ground source heat pump unit (3); It is characterized in that it also includes a filtering component (5) and a hole cleaning component (6), wherein: The filter assembly (5) is placed vertically in the insulation pipe (1), a first water inlet channel (102) is formed between the side of the filter assembly (5) and the side of the insulation pipe (1), the upper end of the first water inlet channel (102) is closed, and a water filter hole (501) is provided on the side of the filter assembly (5) and at a position close to the water inlet hole (101); The hole cleaning component (6) is arranged inside the filter component (5), and one end of the hole cleaning component (6) is used to slide reciprocatingly up and down in the water filter hole (501) to remove the mud and sand in the water filter hole (501).

2. A geothermal well system according to claim 1, characterized in that: It also includes a recharging well (7) and a pressure pump (8), wherein: The booster pump (8) is arranged at the reinjection well (7); The water inlet of the booster pump (8) is connected to the ground source heat pump unit (3) through a pipeline, and the water outlet of the booster pump (8) is connected to the recharging well (7) through a pipeline.

3. A geothermal well system according to claim 2, characterized in that: It also includes a filter (9), The filter screen (9) is detachably arranged inside the wellhead of the reinjection well (7).

4. A geothermal well system according to claim 1, characterized in that: The lower end of the thermal insulation pipe (1) is closed.

5. A geothermal well system according to claim 4, characterized in that: The thermal insulation pipe (1) comprises an inner pipe (11), an outer pipe (12), a thermal insulation material (13) and an end cover (14), wherein: The inner tube (11) is sleeved inside the outer tube (12); an inner cavity (103) is formed between the inner tube (11) and the outer tube (12); and the inner cavity (103) is filled with the heat insulating material (13); The end cover (14) is screwed to the lower end of the inner tube (11).

6. A geothermal well system according to claim 1, characterized in that: One end of the water pump (2) is arranged on the inner side of the filter assembly (5), and the water pump (2) is connected to the ground source heat pump unit (3) through a pipeline.

7. A geothermal well system according to claim 1, characterized in that: The filter assembly (5) comprises an outer cylinder (51), an inner cylinder (52), a hook (53) and sand (54), wherein: The upper ends of the outer tube (51) and the inner tube (52) are open, and the lower ends are closed; the hook (53) is fixedly arranged at the upper end of the outer tube (51); a first outer flange (502) is arranged on the side of the upper end of the outer tube (51); an inner flange (104) is arranged on the inner wall of the thermal insulation pipe (1) at a position corresponding to the first outer flange (502); the first outer flange (502) is placed on the top of the inner flange (104) and abuts against each other; the upper end of the first water inlet channel (102) forms a closed structure through the abutment between the first outer flange (502) and the inner flange (104); A second water inlet channel (504) is formed between the side of the inner cylinder (52) and the side of the outer cylinder (51), and a receiving chamber (505) is formed between the bottom of the inner cylinder (52) and the bottom of the outer cylinder (51); The inner cylinder (52) is arranged at the inner bottom of the outer cylinder (51), the sand material (54) is filled inside the inner cylinder (52), a second outer flange (503) is arranged on the side of the upper end of the inner cylinder (52), the side of the second outer flange (503) is fixedly connected to the inner wall of the outer cylinder (51), and the upper end of the second water inlet channel (504) forms a closed structure through the second outer flange (503); The water filter hole (501) comprises a first water hole (5011) and a second water hole (5012), wherein the first water hole (5011) is provided on the side wall of the outer cylinder (51), and the second water hole (5012) is provided on the side wall of the inner cylinder (52), and the upper and lower ends of the first water hole (5011) and the second water hole (5012) are both wedge-shaped, so that the water inlet port diameter of the first water hole (5011) and the second water hole (5012) is larger than the water outlet port diameter; One end of the hole cleaning component (6) is arranged in the accommodating cavity (505), and the other end is arranged in the second water inlet channel (504); one end of the hole cleaning component (6) arranged in the second water inlet channel (504) is arranged in the first water hole (5011) and the second water hole (5012) in a vertically sliding manner.

8. A geothermal well system according to claim 7, characterized in that: The sand material (54) includes gravel pebbles (541) and fine sand (542), wherein: The gravel pebbles (541) and the powdered fine sand (542) are laid in the inner tube (52) in one layer from bottom to top.

9. A geothermal well system according to claim 8, characterized in that: The hole cleaning assembly (6) comprises a moving ring (61), a first shovel plate (62), a second shovel plate (63), a telescopic rod (64), a lifting seat (65) and a supporting rod (66), wherein: The movable ring (61) is sleeved on the inner cylinder (52) and is slidably connected thereto; The first shovel plate (62) and the second shovel plate (63) are in the shape of an isosceles triangle, and the vertex angle of the isosceles triangle is perpendicular to the inner wall of the thermal insulation pipe (1); one end of the first shovel plate (62) is fixed to the outer side of the movable ring (61), and the other end is slidably arranged in the first water hole (5011); one end of the second shovel plate (63) is fixed to the inner side of the movable ring (61), and the other end is slidably arranged in the second water hole (5012); The telescopic rod (64) is fixedly arranged vertically at the bottom of the accommodating cavity (505), and the output end of the telescopic rod (64) is fixedly connected to the lifting seat (65); One end of the support rod (66) is fixedly connected to the lifting seat (65), and the other end is fixedly connected to the moving ring (61).

10. A geothermal collection method, using a geothermal well system as claimed in claim 9, characterized in that: The following steps are involved: S1. Drilling the pumping well (4) using a drilling machine, and making the bottom of the pumping well (4) below the confined aquifer, and then inserting one end of the insulation pipe (1) having the water inlet hole (101) into the well, and making the inserted end of the insulation pipe (1) abut against the bottom of the pumping well (4), and making the water inlet hole (101) in the confined aquifer; S2, filling the sand material (54) in the inner tube (52), and then placing the filter assembly (5) into the insulation pipe (1) by means of a rope. After the filter assembly (5) is in place, the water pump (2) and the ground source heat pump unit (3) are connected by means of a pipeline, and then the water pump (2) is placed into the insulation pipe (1) by means of a rope and the height at which it is placed is maintained; S3, water in the confined aquifer passes through the water inlet hole (101) and enters the first water inlet channel (102) for a first sedimentation. During the process, the water inlet hole (101) performs a first filtration on the sediment in the water; S4, the water in the first water inlet channel (102) passes through the first water hole (5011) and enters the second water inlet channel (504), and undergoes a second sedimentation in the accommodating chamber (505). During the process, the first water hole (5011) performs a second filtration on the sediment in the water; S5, the water in the second water inlet channel (504) passes through the second water hole (5012) and enters the filter assembly (5), and is filtered in layers by the sand material (54). During the process, the second water hole (5012) filters the sediment in the water for the third time, and the sand material (54) filters the sediment in the water for the fourth time; S6, the water filtered by the sand material (54) rises and enters the insulation pipe (1), is extracted by the water pump (2) and pumped to the ground source heat pump unit (3) for use, thereby completing the collection of geothermal heat; S7. During geothermal collection, the telescopic rod (64) drives the lifting seat (65) to move up and down reciprocatingly, and the lifting seat (65) pulls the first shovel plate (62) and the second shovel plate (63) on the movable ring (61) to move up and down reciprocatingly through the support rod (66) to clear the first water hole (5011) and the second water hole (5012), thereby keeping the first water hole (5011) and the second water inlet channel (504) unobstructed.

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