Anti-blocking geothermal tail water recharging device

Abstract

The invention relates to the technical field of geothermal tail water treatment and resource utilization, in particular to an anti-blocking geothermal tail water recharge device which comprises a geothermal production well, a recharge wellhead and a recharge main pipeline and is integrated with a heat energy recovery mechanism, a fracturing perforation mechanism and a rainstorm emergency mechanism. The heat energy recovery mechanism achieves efficient recovery of waste heat through the synergistic effect of a heat exchanger and a phase change material heat storage tank and converts the waste heat into available energy. The fracturing perforation mechanism can be used for forming small holes in the rock-soil surface so as to enhance the permeability; the rainstorm emergency mechanism can effectively cope with the sudden rainfall situation, and water resource waste is avoided. The effects of improving the geothermal tail water heat utilization rate, optimizing the reservoir characteristics and improving the overall system stability are achieved, and meanwhile the environment-friendly water resource management target is achieved.

Description

Technical Field

[0001] This application relates to the technical field of geothermal tail water treatment and resource utilization, and in particular to an anti-blocking geothermal tail water reinjection device. Background Art

[0002] The geothermal tail water reinjection technology is an important link in the sustainable development of geothermal resources. Against the backdrop of the growing global demand for green energy, this technology not only helps reduce water resource waste but also effectively alleviates problems such as land subsidence caused by geothermal exploitation. With the continuous optimization and development of geothermal utilization systems, geothermal tail water reinjection has become one of the key measures to ensure the long-term stable operation of geothermal fields. Traditional methods usually involve directly injecting the high-temperature fluid extracted from geothermal production wells into reinjection wells. This process requires taking into account the effective utilization of heat energy and the maintenance of rock layer permeability, thus driving the continuous progress of related equipment and technologies.

[0003] Currently, in order to improve the efficiency of geothermal tail water reinjection and protect the underground reservoir structure, various methods are widely adopted in the industry to treat the high-temperature fluid before reinjection. On the one hand, the method of directly reinjecting after simple cooling is commonly used, that is, the fluid temperature is reduced by natural heat dissipation or a simple heat exchange device before reinjection; on the other hand, specially designed heat exchange facilities are introduced to recover part of the heat first and then implement the reinjection process, and a corresponding drainage reserve system is equipped to address potential surface water accumulation hazards. In addition, there are also cases where fracturing tools are used during reinjection to enhance the connectivity of rock fractures to facilitate the smoother entry of the fluid into the target area.

[0004] Regarding the above related technologies, existing single-functional devices cannot synchronously complete integrated operations such as efficient heat energy recovery, precise creation of reservoir fractures, and safe storage under sudden rainfall conditions in the same process. This separate operation mode is likely to lead to low overall work efficiency and may pose additional risk challenges due to improper coordination between components. Therefore, there is an urgent need for an anti-blocking geothermal tail water reinjection device that can comprehensively solve these problems with an integrated device design solution. Summary of the Invention

[0005] To solve the above problems, this application provides an anti-blocking geothermal tail water reinjection device.

[0006] An anti-blocking geothermal tail water reinjection device provided by the present application includes a geothermal production well, a reinjection wellhead, and a main reinjection pipeline. The insertion of the main reinjection pipeline into the reinjection wellhead includes: a heat recovery mechanism, the inlet end of the heat recovery mechanism is connected to the high-temperature fluid outlet of the geothermal production well, and the outlet end of the heat recovery mechanism is connected to the main reinjection pipeline through the heat recovery mechanism. The heat recovery mechanism includes a recovery support frame, and a heat exchanger is arranged on the recovery support frame. A phase change material heat storage tank is arranged on one side of the heat exchanger, and the water outlet end of the heat exchanger is connected to the main reinjection pipeline; a fracturing and perforating mechanism, the fracturing and perforating mechanism is arranged at the end of the main reinjection pipeline, and the fracturing and perforating mechanism is used to open small holes on the rock and soil surface, and the fracturing and perforating mechanism is provided with a perforating component and an electric bridge plug component; a rainstorm emergency mechanism, the rainstorm emergency mechanism is arranged on one side of the reinjection wellhead, and the rainstorm emergency mechanism includes a folding drain pipe and a double-layer reset water storage tank, and the folding drain pipe points to the double-layer reset water storage tank.

[0007] By adopting the above technical solution, the anti-blocking geothermal tail water reinjection device can effectively realize the efficient recovery and utilization of geothermal tail water, and at the same time solve various problems that may be encountered during the reinjection process. First of all, the setting of the heat recovery mechanism realizes the efficient recovery and reuse of the heat energy in the high-temperature fluid discharged from the geothermal production well. The combination of the heat exchanger and the phase change material heat storage tank can not only quickly transfer the heat in the high-temperature fluid to the composite phase change material in the heat storage tank, but also convert the stored heat energy into electric energy through a waste heat power generation unit when needed, thereby improving the energy utilization efficiency of the overall system. This design not only reduces heat waste, but also provides additional energy support for the system.

[0008] Secondly, the introduction of the fracturing and perforating mechanism significantly improves the reliability of the reinjection process. By arranging a perforating component and an electric bridge plug component at the end of the main reinjection pipeline, this mechanism can accurately open small holes on the rock and soil surface to ensure that the tail water can penetrate into the ground smoothly. The perforating substrate in the perforating component cooperates with the perforating plate. Under the action of the pulsed electromagnet, the perforating protrusions on the perforating plate can quickly penetrate the rock and soil layer to form an effective penetration channel. The electric bridge plug component can block the water flow hole through the bridge plug protrusion when necessary to prevent impurities from entering the main reinjection pipeline and further ensure the stable operation of the system.

[0009] In addition, the design of the rainstorm emergency mechanism reflects the adaptability and safety of the device under extreme weather conditions. The combination of the foldable drain pipe and the double-layer reset water storage tank can quickly collect and store excessive surface water during rainstorms, avoiding the impact or blockage of the recharge wellhead caused by waterlogging. The double-layer reset water storage tank preliminarily filters the rainwater through the rainstorm filter screen on the partition board. At the same time, the setting of the electric valve allows the partition holes to be automatically opened when the water storage volume reaches a certain threshold, realizing the water flow between the upper main pool and the lower emergency pool. It can also use the water flow in the emergency layer to backwash the main recharge pipeline to prevent blockage.

[0010] Finally, the entire device also real-time monitors the Ca²⁺, SO4²⁻ ion concentration and flow data of the recharged water through Internet of Things sensors, and precisely controls the working states of the heat energy recovery mechanism, the fracturing perforation mechanism and the rainstorm emergency mechanism in combination with the detection and control device to ensure that the system is always in the best operating state. This intelligent design not only improves the automation level of the device, but also greatly reduces the need for manual intervention, providing a more reliable technical guarantee for geothermal tail water recharge. In summary, through innovative designs in multiple aspects, the device has successfully solved many problems in the process of geothermal tail water recharge, and has significant technical advantages and practical application values.

[0011] Preferably, the high-temperature side inlet of the heat exchanger is connected to a steam pipeline, the steam pipeline is connected to the geothermal production well, the low-temperature inlet end of the heat exchanger is communicated with a heat preservation pipeline, and the heat preservation pipeline is connected to the phase change material heat storage tank; the outside of the phase change material heat storage tank is coated with a heat insulation layer, a waste heat power generation unit is arranged on the top of the phase change material heat storage tank, and a composite phase change material is arranged inside the heat storage tank.

[0012] By adopting the above technical solutions, the waste heat in the geothermal tail water can be effectively utilized for energy recovery, and at the same time, the efficient storage and reuse of heat energy can be realized. Specifically, the high-temperature geothermal tail water first enters the heat exchanger through the steam pipeline and exchanges heat with the composite phase change material, so that the heat energy is fully absorbed and stored in the phase change material heat storage tank, thereby reducing heat loss. In addition, the heat insulation layer outside the phase change material heat storage tank further reduces the heat energy dissipation and improves the heat storage efficiency. More importantly, the waste heat power generation unit arranged on the top can convert the stored heat energy into electric energy, realizing the multi-level utilization of energy and significantly improving the energy utilization rate and economy of the entire system.

[0013] Preferably, the perforation assembly includes a perforation substrate disposed on the inner wall of the discharge port of the main recharging pipeline. The perforation substrate is fixedly arranged on the inner wall of the main recharging pipeline. A plurality of first flow holes are provided on the perforation substrate. A plurality of return springs are arranged on the perforation substrate. One end of the return spring away from the perforation substrate is provided with a perforation plate. The perforation plate is slidably connected to the inner wall of the main recharging pipeline. A plurality of perforation protrusions are arranged on the perforation plate. The perforation protrusions point to the rock and soil layer. A water flow hole is arranged in the perforation protrusion. One end of the perforation substrate pointing to the perforation plate is provided with a pulsed electromagnet. A reciprocating magnet is arranged on one end of the perforation plate pointing to the perforation substrate.

[0014] By adopting the above technical solution, the perforation assembly can achieve precise perforation operation on the rock and soil layer. Specifically, the cooperative design between the perforation substrate and the perforation plate, combined with the elastic action of the return spring, enables the perforation plate to move quickly under the drive of the pulsed electromagnet, thereby effectively impacting the rock and soil layer with the perforation protrusions to form a through hole. At the same time, the design of the water flow hole can not only ensure the smooth passage of water during the perforation process, but also provide a stable flow path for the subsequent geothermal tail water recharging after the perforation is completed. In addition, the interaction between the reciprocating magnet and the pulsed electromagnet improves the controllability of the perforation action, further enhancing the perforation efficiency and accuracy.

[0015] Preferably, the electric bridge plug assembly includes a bridge plug electric telescopic rod disposed in the main recharging pipeline. One end of the bridge plug electric telescopic rod is fixed on the inner wall of the main recharging pipeline. The movable end of the bridge plug electric telescopic rod is connected with a bridge plug substrate. A plurality of second flow holes are provided on the bridge plug substrate. The bridge plug substrate is slidably connected to the inner wall of the main recharging pipeline. A plurality of bridge plug protrusions are arranged on the bridge plug substrate. The bridge plug protrusions can be inserted into the water flow holes.

[0016] By adopting the above technical solution, the bridge plug electric telescopic rod drives the bridge plug substrate to move in the main recharging pipeline, realizing precise blocking and opening of the water flow holes. This design effectively controls the fluid flow path during the tail water recharging process, avoids the blockage of the small holes in the rock and soil layer due to the change of fluid pressure, and improves the operation stability and controllability of the recharging system at the same time.

[0017] Preferably, a filter screen section is provided on the main recharging pipeline. The filter screen section includes two layers of filter screens, and activated carbon particles are arranged between the two layers of filter screens.

[0018] By adopting the above technical solution, the filter screen section on the recharge main pipeline can effectively intercept solid impurities in the geothermal tail water. The double-layer screen design further improves the filtration efficiency and reliability. At the same time, the activated carbon particles between the two layers of screens can adsorb organic matters and odors in the water, thereby improving the recharge water quality and reducing the risk of blockage and corrosion of the recharge wellhead and subsequent equipment by impurities.

[0019] Preferably, the foldable drain pipe includes a main drain pipe and a corrugated steel folding section. The main drain pipe is connected to the side wall of the recharge wellhead through a flange. A drain switch valve is arranged on the main drain pipe. The corrugated steel folding section is inserted into the double-layer reset water storage pool. The double-layer reset water storage pool includes an upper main pool and a lower emergency pool. A partition plate is arranged between the upper main pool and the lower emergency pool. Partition holes are arranged on the partition plate. A rainstorm filter screen plate is arranged in the partition holes. An electric valve is also arranged on the partition plate, and the electric valve can block the partition holes.

[0020] By adopting the above technical solution, the cooperation between the main drain pipe and the corrugated steel folding section can flexibly adapt to different terrains and rainstorm intensities, effectively collect and guide rainwater into the double-layer reset water storage pool. The design of the upper main pool and the lower emergency pool ensures the improvement of the water storage capacity in case of rainstorms. At the same time, the rainstorm filter screen plate on the partition plate can effectively intercept impurities and prevent blockage. In addition, the setting of the electric valve can control the water flow direction according to actual needs, further enhancing the flexibility of the system. More importantly, the water stored in the double-layer reset water storage pool can be led out through a pipeline for reverse flushing of the recharge main pipeline, effectively removing impurities on the filter screen section, thereby ensuring the smoothness and efficient operation of the entire recharge device.

[0021] Preferably, the rainstorm emergency mechanism further includes a water level sensor and a reverse flushing pump. The water level sensor is arranged on the inner walls of the main pool and the emergency pool. A flushing pipeline is arranged on the emergency pool. The flushing pipeline communicates with the recharge main pipeline. The flushing pipe communicates behind the filter screen section and can flush the filter screen section in the reverse direction. A reverse flushing pump is arranged on the flushing pipeline. A first switch valve is also arranged on the recharge main pipeline. A sewage discharge pipe is connected to the recharge main pipeline. The sewage discharge pipe points vertically to the ground. A second switch valve is arranged on the sewage discharge pipe.

[0022] By adopting the above technical solutions, it is possible to effectively prevent the blockage of the main recharging pipeline and the filter screen section in case of heavy rain. When the water level reaches a certain height, the water level sensor timely feeds back a signal, and the reverse flushing pump starts. The filter screen section is reversely flushed by using the flushing pipeline to remove the impurities attached to the filter screen. At the same time, the first switching valve and the second switching valve work together to ensure that the sewage during the flushing process can be smoothly discharged through the sewage discharge pipe, avoiding the backflow of pollutants into the recharging system, thereby greatly improving the stability and reliability of the device.

[0023] Preferably, it further includes an intelligent control system. The intelligent control system includes: an Internet of Things sensor, which is arranged in the main recharging pipeline, the heat exchanger, and the rainstorm emergency mechanism; and a detection and control device, which is used to receive the signals of the Internet of Things sensor and control the operation of the heat energy recovery mechanism, the fracturing perforation mechanism, and the rainstorm emergency mechanism.

[0024] By adopting the above technical solutions, the intelligent control system can monitor the operating states of the main recharging pipeline, the heat exchanger, and the rainstorm emergency mechanism in real time, and automatically adjust the working parameters of each mechanism according to the collected data. This intelligent control method not only improves the operating efficiency of the system, but also effectively reduces the need for manual intervention, ensuring the stability and reliability of the geothermal tail water recharging process. At the same time, by precisely controlling the flow characteristics of the recharged water, the risk of equipment blockage is further reduced, and the service life of the device is extended.

[0025] Preferably, the Internet of Things sensor can monitor the Ca²⁺, SO4²⁻ ion concentrations and flow rate data of the recharged water.

[0026] By adopting the above technical solutions, the real-time monitoring of the Ca²⁺, SO4²⁻ ion concentrations and flow rate data in the recharged water is realized. Combined with the intelligent control system, the water quality and flow rate information of the recharged water can be obtained in a timely manner, providing data support for preventing scaling and blockage during the geothermal tail water recharging process, and effectively carrying out backflow flushing before scaling, thereby improving the operating efficiency and stability of the entire recharging device. The specific effects include: the real-time monitoring function improves the intelligent level of the system, and the accurate data collection helps to optimize the operating parameters such as heat energy recovery and fracturing perforation, ultimately extending the service life of the equipment and reducing the maintenance cost.

[0027] Preferably, the waste heat generating unit is an organic Rankine cycle generating unit, and the evaporator coil of the organic Rankine cycle generating unit is embedded in the phase change material.

[0028] By adopting the above technical solution, the evaporator coil of the organic Rankine cycle power generation unit is embedded in the phase change material, which can effectively improve the thermal energy conversion efficiency. At the same time, by utilizing the energy storage characteristics of the phase change material, the efficient storage and stable release of waste heat can be achieved, thereby providing a more continuous and stable heat source for the power generation unit, reducing energy loss and improving the overall energy utilization rate.

[0029] In summary, the present application includes at least one of the following beneficial technical effects of the anti-blocking geothermal tail water reinjection device: 1. The introduction of the heat energy recovery mechanism realizes the efficient recovery and comprehensive utilization of the waste heat of geothermal tail water. By introducing high-temperature fluid from the geothermal production well into the heat exchanger, and cooperating with the phase change material heat storage tank and the waste heat power generation unit, the energy utilization efficiency can be significantly improved. Specifically, the heat exchanger can effectively transfer the heat in the geothermal water to the low-temperature medium, avoiding heat waste. The phase change material heat storage tank can further store this part of heat for subsequent heating or power generation needs. In addition, the waste heat power generation unit installed at the top adopts the organic Rankine cycle technology, which can directly convert the heat stored in the phase change material into electric energy to provide auxiliary power support for the entire device, thereby realizing the cascade utilization of energy. This design not only improves the overall energy efficiency of the system, but also effectively reduces the temperature of the tail water, reducing the possible thermal pollution problem during the reinjection process and contributing to environmental protection.

[0030] 2. The innovative design of the fracturing perforation mechanism solves the problem of poor permeability of rock and soil layers, and significantly improves the reinjection efficiency of geothermal tail water. By setting the perforation assembly and the electric bridge plug assembly at the end of the main reinjection pipeline, this mechanism can accurately open small holes on the surface of the rock and soil layer to form effective permeation channels. The perforation substrate, the return spring and the perforation plate in the perforation assembly work together. Under the action of the pulse electromagnet, the perforation protrusion quickly impacts the rock and soil layer to form evenly distributed small holes. At the same time, the bridge plug electric telescopic rod in the electric bridge plug assembly can flexibly adjust its position according to actual needs, ensuring the smooth flow of water while preventing impurities such as sediment from entering the reinjection pipeline. This design not only enhances the penetration ability of the reinjected water, but also effectively avoids the risk of pipeline blockage, greatly improving the reliability and stability of the reinjection system.

[0031] 3. The rainstorm emergency mechanism, through the ingenious combination of a folding drain pipe and a double-layer reset water storage tank, provides a reliable solution for coping with extreme weather. When a rainstorm comes, the folding drain pipe can be quickly deployed under the action of a hydraulic support to direct the external water source to the double-layer reset water storage tank. The partition design between the main pool and the emergency pool, in conjunction with the rainstorm filter screen and the electric valve, can effectively intercept debris and control the water flow distribution. At the same time, the water level sensor monitors the water level change in the water storage tank in real time. Once the preset threshold is reached, the reverse flushing pump is started, and the water flow in the recharging main pipeline is used to reverse flush the filter screen section to prevent blockage. This intelligent design not only ensures the normal operation of the recharging system but also takes into account the reasonable allocation of water resources, can prevent scaling in advance, and greatly improves the adaptability and emergency response level of the system. Brief Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of an embodiment of the present application; Figure 2 is a partial structural sectional view of an embodiment of the present application; Figure 3 is an embodiment of the present application Figure 2 enlarged view of part A; Figure 4 is a schematic sectional view of the screen mesh of an embodiment of the present application; Figure 5 is a schematic sectional view of the evaporator coil of an embodiment of the present application.

[0033] Description of the Reference Numerals: 1, geothermal production well; 11, recharging wellhead; 12, recharging main pipeline; 2, heat energy recovery mechanism; 21, recovery support frame; 22, heat exchanger; 23, phase change material heat storage tank; 3, fracturing and perforating mechanism; 31, perforating assembly; 311, perforating substrate; 312, first flow hole; 313, return spring; 314, perforating plate; 315, perforating protrusion; 316, water flow hole; 317, pulse electromagnet; 318, reciprocating magnet; 32, electric bridge plug assembly; 321, bridge plug electric telescopic rod; Specific Embodiments

[0034] The following further elaborates on this application in conjunction with the attached Figures 1-5 drawings.

[0035] Referring to Figures 1-3 , an anti-blocking geothermal tail water reinjection device provided by an embodiment of this application includes a geothermal production well 1, a reinjection wellhead 11, and a main reinjection pipeline 12. Among them, the main reinjection pipeline 12 is inserted into the reinjection wellhead 11. It further includes a heat recovery mechanism 2, a fracturing and perforating mechanism 3, and a rainstorm emergency mechanism 4, and also includes an intelligent control system 6. Each mechanism cooperates with each other to jointly achieve an efficient and stable geothermal tail water reinjection function.

[0036] Referring to Figure 1 , specifically, the heat recovery mechanism 2 includes a recovery support frame 21, on which a heat exchanger 22 is arranged, and a phase change material heat storage tank 23 is arranged on one side of the heat exchanger 22. The heat exchanger 22 can adopt a plate heat exchanger 22 or a shell-and-tube heat exchanger 22, and its interior includes copper heat exchange tubes and stainless steel fins to improve the heat exchange efficiency. The phase change material heat storage tank 23 is filled with a composite phase change material, such as a paraffin-based phase change material or a hydrate-based phase change material, which can effectively store the waste heat in the geothermal water. The water outlet end of the heat exchanger 22 is connected to the main reinjection pipeline 12. By transferring the heat of the high-temperature geothermal water to the phase change material, not only the waste heat recovery is realized, but also the temperature of the reinjected water is reduced, thereby reducing the impact on the formation.

[0037] The working principle is as follows: When the high-temperature geothermal water flows out of the geothermal production well 1, it first enters the high-temperature side inlet of the heat exchanger 2 by passing through the steam pipeline, exchanges heat with the heat exchange tubes in the heat exchanger 2, and then the condensed water flows into the phase change material heat storage tank 23 through the heat preservation pipeline. The phase change material absorbs the heat and stores it, completing the waste heat recovery process.

[0038] Referring to Figure 2 , Figure 3 , specifically, the fracturing and perforating mechanism 3 is arranged at the end of the main reinjection pipeline 12 and is used to open small holes on the rock and soil surface to improve the permeability of the reinjected water. The fracturing and perforating mechanism 3 is provided with a perforating assembly 31 and an electric bridge plug assembly 32. The perforating assembly 31 includes a perforating substrate 311 and a perforating plate 314. The perforating substrate 311 is fixed on the inner wall of the main reinjection pipeline 12, and a number of first flow holes 312 and a return spring 313 are arranged thereon. The perforating plate 314 is slidably connected to the inner wall of the main reinjection pipeline 12, and a number of perforating protrusions 315 are arranged thereon. Water flow holes 316 are arranged in the perforating protrusions 315, which can accurately point to the rock and soil layer. A pulse electromagnet 317 is arranged at one end of the perforating substrate 311 pointing to the perforating plate 314, and a reciprocating magnet 318 is arranged at one end of the perforating plate 314 pointing to the perforating substrate 311.

[0039] The working principle is as follows: When perforation operation is required, the pulsed electromagnet 317 is energized to generate an instantaneous strong magnetic field, which pushes the perforation plate 314 to move rapidly, enabling the perforation protrusion 315 to penetrate the rock and soil layers, forming small holes, thereby significantly improving permeability. The electric bridge plug assembly 32 includes a bridge plug electric telescopic rod 321, a bridge plug base plate 322, and a bridge plug protrusion 324. A number of second flow holes 323 are provided on the bridge plug base plate 322. The bridge plug protrusion 324 is made of elastic rubber material and can be tightly inserted into the water flow hole 316 to prevent the backflow of the recharged water. The bridge plug base plate 322 is slidably connected to the inner wall of the main recharging pipeline 12, and its position is controlled by the bridge plug electric telescopic rod 321 to achieve precise control of the water flow.

[0040] Reference Figure 2 , Figure 3 and Figure 4 , specifically, the rainstorm emergency mechanism 4 is arranged on one side of the recharging wellhead 11 and includes a folding drainage pipe 41 and a double-layer reset water storage tank 42. The folding drainage pipe 41 consists of a main drainage pipe 411 and a corrugated steel folding section 412. The main drainage pipe 411 is connected to the side wall of the recharging wellhead 11 through a flange, and the corrugated steel folding section 412 is inserted into the double-layer reset water storage tank 42. The double-layer reset water storage tank 42 includes an upper main pool 421 and a lower emergency pool 422, which are separated by a partition plate 423. The partition plate 423 is provided with a partition hole 424 and a rainstorm filter screen 425.

[0041] The working principle is as follows: When a rainstorm comes, the hydraulic support drives the folding drainage pipe 41 to unfold, introducing external water sources into the double-layer reset water storage tank 42, and the water gradually fills the upper main pool 421; when the water level reaches the set value, the electric valve 426 opens, and the water flows into the lower emergency pool 422 through the partition hole 424, preventing external water sources from directly invading the recharging pipeline and causing blockage and filtering to prevent excessive external impurities.

[0042] Reference Figures 1-4 , specifically, the intelligent control system 6 includes an Internet of Things sensor 61 and a detection and control device 62. The Internet of Things sensor 61 is arranged in the main recharging pipeline 12, the heat exchanger 22, and the rainstorm emergency mechanism 4 for monitoring the Ca²⁺, SO4²⁻ ion concentrations and flow rate data of the recharged water. The detection and control device 62 receives the signals from the Internet of Things sensor 61 and controls the operations of the heat energy recovery mechanism 2, the fracturing and perforation mechanism 3, and the rainstorm emergency mechanism 4.

[0043] The working principle is as follows: When it is detected that the Ca²⁺, SO4²⁻ ion concentrations in the recharged water are too high, the system automatically adjusts the recharging flow rate to prevent scaling; when a rainstorm comes and the water level rises, the intelligent control system 6 automatically starts the folding drainage pipe 41 and the reverse flushing pump 44 to ensure the normal operation of the system.

[0044] References Figure 5 Specifically, a waste heat generator set, specifically an organic Rankine cycle generator set 7, is installed on top of the heat storage tank. Its evaporator coil 71 is embedded in a phase change material. When the phase change material absorbs heat and reaches a certain temperature, the organic working fluid evaporates and drives the turbine to generate electricity, realizing the comprehensive utilization of waste heat.

[0045] The working principle is: by optimizing the structure of the heat exchanger 22 and the phase change material heat storage tank 23, the waste heat recovery efficiency is significantly improved, and the secondary utilization of energy is achieved through waste heat power generation, further improving the economy and environmental protection of the system.

[0046] The implementation principle of the anti-clogging geothermal tailwater recharge device of the present application embodiment is as follows: First, the high-temperature fluid extracted from the geothermal production well 1 will first enter the heat exchanger 22 for heat conduction with the cooling medium to release excess heat to the phase change material for storage for future use; it can be used for power generation; then, the cooled fluid will advance along the recharge main pipeline 12 to a predetermined position to activate the perforating assembly 31 to create artificial fractures of appropriate size to promote the connectivity of the underground medium; finally, if an extreme weather event such as a short period of heavy rainfall is encountered, the storm emergency plan will be quickly activated to guide the excess water into a special container for storage and subsequent processing and release into the natural environment. This series of operations forms a closed-loop management system, with each link tightly connected and cooperating to achieve the effect of energy conservation and emission reduction.

[0047] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An anti-blocking geothermal tail water reinjection device, comprising a geothermal production well (1), a reinjection wellhead (11) and a main reinjection pipeline (12), wherein the main reinjection pipeline (12) is inserted into the reinjection wellhead (11), and is characterized in that, Including: A heat energy recovery mechanism (2), the inlet end of the heat energy recovery mechanism (2) is connected to the body outlet of the geothermal production well (1), the outlet end of the heat energy recovery mechanism (2) is connected through a main reinjection pipeline (12), the heat energy recovery mechanism (2) includes a recovery support frame (21), a heat exchanger (22) is arranged on the recovery support frame (21), a phase change material heat storage tank (23) is arranged on one side of the heat exchanger (22), and the water outlet end of the heat exchanger (22) is connected to the main reinjection pipeline (12); A fracturing and perforating mechanism (3), the fracturing and perforating mechanism (3) is arranged at the end of the main reinjection pipeline (12), the fracturing and perforating mechanism (3) is used for opening small holes on the rock and soil surface, and a perforating component (31) and an electric bridge plug component (32) are arranged in the fracturing and perforating mechanism (3); A rainstorm emergency mechanism (4), the rainstorm emergency mechanism (4) is arranged on one side of the reinjection wellhead (11), the rainstorm emergency mechanism (4) includes a folding drainage (41) pipe and a double-layer reset water storage tank (42), and the folding drainage (41) pipe points to the double-layer reset water storage tank (42).

2. The anti-blocking geothermal tail water recharge device according to claim 1, characterized in that: The inlet of the heat exchanger (22) is connected with a steam pipeline, the steam pipeline is connected to the geothermal production well (1), the outlet end of the heat exchanger (22) is communicated with a heat preservation pipeline, and the heat preservation pipeline is connected to the phase change material heat storage tank (23); The outside of the phase change material heat storage tank (23) is coated with a heat insulation layer, a waste heat generating set is arranged at the top of the phase change material heat storage tank (23), and a composite phase change material is arranged inside the heat storage tank.

3. The anti-blocking geothermal tail water recharge device according to claim 1, characterized in that: The perforating component (31) includes a perforating substrate (311) arranged on the inner wall of the discharge port of the main reinjection pipeline (12), the perforating substrate (311) is fixedly arranged on the inner wall of the main reinjection pipeline (12), a plurality of first flow holes (312) are arranged on the perforating substrate (311), a plurality of reset springs (313) are arranged on the perforating substrate (311), one end of the reset spring (313) away from the perforating substrate (311) is provided with a perforating plate (314), the perforating plate (314) is slidably connected to the inner wall of the main reinjection pipeline (12), a plurality of perforating protrusions (315) are arranged on the perforating plate (314), the perforating protrusions (315) point to the rock and soil layer, a water flow hole (316) is arranged in the perforating protrusion (315), one end of the perforating substrate (311) pointing to the perforating plate (314) is provided with a pulse electromagnet (317), and a reciprocating magnet (318) is arranged on one end of the perforating plate (314) pointing to the perforating substrate (311).

4. The anti-clogging geothermal tail water recharge device according to claim 3, characterized in that: The electric bridge plug assembly (32) includes a bridge plug electric telescopic rod (321) disposed in the recharge main pipeline (12). One end of the bridge plug electric telescopic rod (321) is fixed on the inner wall of the recharge main pipeline (12). The movable end of the bridge plug electric telescopic rod (321) is connected to a bridge plug base plate (322). A plurality of second flow holes (323) are provided on the bridge plug base plate (322). The bridge plug base plate (322) is slidably connected to the inner wall of the recharge main pipeline (12). A plurality of bridge plug protrusions (324) are provided on the bridge plug base plate (322), and the bridge plug protrusions (324) can be inserted into the water flow holes (316).

5. A clogging-proof geothermal tail water recharge device according to claim 1, characterized in that: A filter screen section is provided on the recharge main pipeline (12). The filter screen section includes two layers of filter screens (5), and activated carbon particles are provided between the two layers of filter screens (5).

6. The anti-clogging geothermal tail water recharge device according to claim 5, characterized in that: The foldable drain pipe (41) includes a main drain pipe (411) and a corrugated steel folding section (412). The main drain pipe (411) is connected to the side wall of the recharge wellhead (11) through a flange. A drain switch valve (413) is provided on the main drain pipe (411). The corrugated steel folding section (412) is inserted into the double-layer reset storage pool (42). The double-layer reset storage pool (42) includes an upper main pool (421) and a lower emergency pool (422). A partition plate (423) is provided between the upper main pool (421) and the lower emergency pool (422). A partition hole (424) is provided on the partition plate (423), and a rainstorm filter screen plate (425) is provided in the partition hole (424). An electric valve (426) is also provided on the partition plate (423), and the electric valve (426) can block the partition hole (424).

7. The anti-clogging geothermal tail water recharge device according to claim 6, characterized in that: The rainstorm emergency mechanism (4) further includes a water level sensor (43) and a reverse flushing pump (44). The water level sensor (43) is provided on the inner walls of the main pool and the emergency pool. A flushing pipeline (45) is provided on the emergency pool, and the flushing pipeline (45) communicates with the recharge main pipeline (12). The flushing pipe communicates with the side of the filter screen section close to the geothermal production well (1) and can flush the filter screen section in the reverse direction. It also includes a first switch valve (46) provided between the flushing pipeline (45) and the geothermal production well (1). The first switch valve (46) is provided on the recharge main pipeline (12). A sewage discharge pipe (47) is also included. The sewage discharge pipe (47) is connected to the recharge main pipeline (12), and the sewage discharge pipe (47) points vertically to the ground. The sewage discharge pipe (47) is provided between the filtering section and the first switch valve (46). A second switch valve (48) is provided on the sewage discharge pipe (47). A third switch valve (49) is provided between the filtering section and the recharge wellhead (11).

8. A clogging-proof geothermal tail water recharge device according to claim 1, characterized in that: It further includes an intelligent control system (6), and the intelligent control system (6) includes: an Internet of Things sensor (61), and the Internet of Things sensor (61) is arranged on the main re-injection pipeline (12), the heat exchanger (22) and the rainstorm emergency mechanism (4); it further includes a detection and control device (62), and the detection and control device (62) is used for receiving signals from the Internet of Things sensor (61) and controlling the operation of the heat energy recovery mechanism (2), the fracturing and perforating mechanism (3) and the rainstorm emergency mechanism (4).

9. The anti-clogging geothermal tail water recharge device according to claim 8, characterized in that: The Internet of Things sensor (61) can monitor the Ca²⁺, SO4²⁻ ion concentration and flow data of the re-injected water.

10. A geothermal tail water recharge device for preventing blockage according to claim 2, characterized in that: The waste heat power generation unit is an organic Rankine cycle power generation unit (7), and the evaporator coil (71) of the organic Rankine cycle power generation unit (7) is embedded in the phase change material.

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