Geothermal well integrated device for drilling and injecting

Abstract

The application discloses a geothermal well integrated device for mining and grouting, and belongs to the technical field of geothermal well integrated mining and grouting. The device comprises a sand setting pipe, the lower end of the sand setting pipe is connected with a sand pumping pipe through thread cooperation, a flow disturbing assembly is arranged in the sand pumping pipe, a plurality of through grooves are formed in the outer periphery of the sand pumping pipe, the flow disturbing assembly comprises a flow disturbing plate arranged in the through groove, the flow disturbing plate can be retracted in the sand pumping pipe through a horizontal position adjusting assembly, a driving assembly is arranged in the sand pumping pipe to drive the flow disturbing plate to rotate and generate a rotational flow; the horizontal position adjusting assembly comprises a sleeve in axial sliding cooperation with a rotating shaft, the sleeve drives the flow disturbing plate to retract synchronously through a supporting rod; a lifting adjusting assembly drives the sleeve to move axially through an electric push rod, a piston, a circular ring and a fixing frame. The flow disturbing plate is linked with retraction and rotation, the through hole and the through groove are synchronously opened and closed, the sand setting pipe and the sand pumping pipe are fully connected in section, the rotational flow pressurizes and lifts up the compacted sand, direct sand cleaning in the well is realized, and the interval period of pipe lifting and maintenance is prolonged.

Description

Technical Field

[0001] This invention relates to the field of geothermal well co-production and irrigation technology, specifically to an integrated geothermal well co-production and irrigation device. Background Technology

[0002] The geothermal well co-production and recharge technology involves setting up an inner and outer pipe within the same wellbore, using the annulus between the inner and outer pipes as a recharge water channel. The inner pipe is connected in sequence with a submersible pump, a central pumping pipe, a pumping screen pipe, and a sedimentation pipe, enabling the simultaneous extraction of underground hot water and the recharge tailwater.

[0003] For example, Chinese patent CN209100019U discloses a well construction structure for geothermal reinjection wells based on medium-deep sandstone thermal reservoirs. The pump chamber casing is connected to the technical casing via a hanger, and an external annulus is provided outside both the pump chamber casing and the technical casing. A two-stage centralizer is installed on the upper part of the technical casing, a graded clamp and a blind plate are installed on the lower part of the technical casing, and an external packer is installed in the external annulus of the technical casing. A cement umbrella is fitted at the bottom of the technical casing and connected to a screen pipe by threads. A rubber umbrella is fitted at the top of the screen pipe, and a sand-collecting pipe is connected to the bottom of the screen pipe by threads. The pumping channel and the injection channel are set alternately in the same well, and the extraction of high-temperature water from the lower layer and the reinjection of low-temperature water from the upper layer are carried out simultaneously, achieving efficient heat extraction through reinjection in the same well.

[0004] In existing technologies, during long-term operation of the same well extraction and irrigation device, gravel in the strata enters the sedimentation pipe with the extracted groundwater and gradually settles and accumulates. The screen holes of the pumping screen are also easily blocked by fine particles. Therefore, it is necessary to regularly flush the well to remove the settled gravel and screen attachments, and maintain the wellbore flow capacity and extraction and irrigation efficiency.

[0005] However, existing well-washing maintenance typically employs high-flow-rate pumping, where the water flow agitates suspended sediment and carries gravel upwards through the pumping screen into the central tubing, where it is pumped to the surface by a submersible pump. However, the bottom of the screen is sealed with a plug, meaning the water flow through the screen can only draw out the sediment within the settling pipe. The wellbore lacks an effective fluid disturbance channel at the bottom. For thick sediment layers already compacted and solidified at the bottom of the settling pipe, simply relying on the upper water flow is insufficient to agitate and suspend them, resulting in limited well-washing effectiveness. When gravel accumulates severely at the bottom of the settling pipe, the entire tubing string needs to be pulled out of the ground, the plug removed, and the sand drained. This high frequency and long cycle significantly impact the continuous operating efficiency of geothermal wells. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this invention provides an integrated geothermal well production and irrigation device. This device solves the technical problem of effectively disturbing and sucking compacted sand when the bottom of the sand-collecting pipe is closed in the existing technology by synchronously linking three functions in axial movement: in-pipe swirling disturbance, sand-collecting channel opening and closing, and internal and external water flow. This allows the disturbance, transportation, and discharge of sand in the well to be completed without pulling out the tubing during the well cleaning operation, reducing the maintenance frequency of pulling out the tubing and sand-collecting, significantly reducing the intensity of maintenance work, and extending the effective operating cycle of the integrated production and irrigation tubing.

[0007] To achieve the above objectives, the present invention provides the following technical solution: An integrated geothermal well production and irrigation device includes a sedimentation pipe and a dredging pipe at the lower end of the sedimentation pipe. The dredging pipe is equipped with a flow-increasing component for pressurizing the pipe during well flushing. The outer periphery of the dredging pipe has several through slots. The flow-increasing component includes a flow-increasing plate disposed in the through slot. The flow-increasing plate can be retracted into the dredging pipe by a horizontal position adjustment component. The dredging pipe is equipped with a drive component that drives the flow-increasing plate to rotate when it is fully inserted into the dredging pipe, so that the flow-increasing plate drives the groundwater in the dredging pipe to rotate and generate an upward vortex.

[0008] Preferably, the drive assembly includes a rotating shaft for synchronously rotating the spoiler and the horizontal position adjustment assembly, and the rotating shaft is driven to rotate by a drive motor.

[0009] Preferably, the horizontal position adjustment component includes a sleeve that slides axially with the rotating shaft, and the sand extraction pipe is provided with a lifting adjustment component that drives the sleeve to move axially along the rotating shaft. The sleeve drives all the spoilers to retract synchronously through multiple support rods set on its outer periphery.

[0010] Preferably, the two ends of the strut are respectively hinged to the sleeve and the spoiler via hinge seats, and each spoiler is connected to the sleeve via at least two mutually parallel struts.

[0011] Preferably, the outer periphery of the rotating shaft is provided with a plurality of sliding grooves extending along its axial direction, and a slider fixedly connected to the sleeve is slidably installed in the sliding groove.

[0012] Preferably, the lifting adjustment assembly includes several electric actuators evenly distributed inside the sand extraction pipe. A support plate for mounting the electric actuators is fixedly installed inside the sand extraction pipe. The movable ends of all the electric actuators are fixedly connected to a piston. A ring is rotatably mounted on the top of the piston. A fixing bracket that is fixedly connected to the sleeve is provided on the ring. The rotating shaft passes through the piston and the support plate from top to bottom.

[0013] Preferably, it also includes a guide assembly disposed inside the sand dredging pipe. The guide assembly includes two rotating rings rotatably installed inside the sand dredging pipe. The two rotating rings are distributed on the upper and lower sides of the spoiler. Each rotating ring is fixedly installed with a guide frame corresponding to the spoiler. A guide rod is slidably fitted on the guide frame. One end of the guide rod is fixedly connected to the opposite spoiler.

[0014] Preferably, it also includes a sealing assembly disposed above the rotating shaft. The sealing assembly includes a sealing plate fixedly installed inside the sand extraction pipe. The bottom of the sealing plate has a conical groove, and the top of the conical groove has a through hole. A partition plate fixedly connected to the sleeve is disposed inside the through hole.

[0015] Preferably, a plurality of guide plates evenly distributed in a ring are fixedly installed on the inner wall of the sand extraction pipe. The guide plates are all inclined and located below the sealing plate, and guide blocks are fixedly installed on the inner side of each guide plate.

[0016] Preferably, the rotating shaft is provided with a position sensor for detecting its rotational position.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By linking the radial contraction and rotational drive of the baffle plate, reliable compatibility between normal extraction / injection and efficient sand removal is achieved, avoiding the operational limitations of conventional tubing requiring removal from the surface for unblocking and sand removal. In this scheme, the baffle plate is embedded in the permeable groove during normal extraction / injection to prevent external gravel from depositing into the sand extraction pipe. During sand removal, it is drawn into the pipe and rotated by the drive component. The baffle plate and guide block circumferentially push the water flow to form a spiral upward vortex. The vortex continuously transfers kinetic energy along the axial direction, continuously disturbing the gravel accumulated in the sand removal pipe. This loosens the sand that was originally settled at the bottom of the sand removal pipe and was difficult to extract, and it is gradually extracted to the outside with the water flow, significantly reducing the amount of residual sand. This enables online sand removal in the well, improves the construction efficiency of well washing, and eliminates the need for frequent pipe pulling and cleaning, extending the pipe pulling and maintenance interval of the geothermal extraction equipment.

[0018] 2. By synchronously opening and closing the sand settling channel and the inlet channel of the pipe wall through axial linkage, the sand settling pipe and the sand pumping pipe are fully connected, providing a flow path for the direct suction of compacted sand. In this scheme, the sealing component moves in unison with the axial movement of the horizontal position adjustment component. The through hole opens simultaneously with the through slot, so that the flow window and the longitudinal flow channel open simultaneously during well washing. A through flow path is formed between the inner cavity of the sand pumping pipe, the annulus of the wellbore, and the sand settling cavity. The well washing water can enter the sand pumping pipe from the annulus and positively flush the sand settling cavity. This changes the condition of the existing technology where the bottom of the sand settling pipe lacks an effective fluid supply channel, and provides sufficient water flow conditions for the suspension and discharge of the bottom sand.

[0019] 3. By linking the telescopic adjustment mechanism with the sealing components, a controllable connection path between the internal and external flow channels is constructed under the backflow condition. In this scheme, during the sand suction cleaning process, the water flow in the well enters the sand suction pipe radially through the perforated channel. Under the rotation of the turbulence-inducing components, a vortex is formed inside the sand suction pipe. Under the combined effect of the vortex and the suction effect of the sand suction pipe, a low-pressure zone is formed relative to the annulus inside the well. The high-pressure water in the annulus is continuously forced into the sand suction pipe, thus generating a certain pressurization effect inside the sand suction pipe. This causes the water flow to form a spiral upward lifting force, which continuously lifts and transports the thick sediment solidified at the bottom. This changes the existing cleaning mode, which can only be suctioned through the screen pipe, reducing the frequency of operations requiring frequent removal of the tubing string for surface sand removal and wellbore air-lift sand cleaning.

[0020] 4. Through the coordinated operation of the vortex guiding structure and the sealing components, the water flow forms a stable spiral upward flow pattern within the sand-driving pipe, enhancing sand-carrying capacity while actively cleaning the screen section. In this scheme, as the vortex carries sand and gravel upward along the sand-driving pipe and flows through the pumping screen, the high-speed rotation of the water creates a continuous tangential scouring effect on the screen surface. Fine particles attached to and embedded within the screen are sheared and peeled off by the vortex and discharged with the water flow. This removes bottom sediment while restoring the flow capacity of the screen, eliminating the need for a separate screen cleaning process or additional cleaning equipment. This improves the overall efficiency of well cleaning maintenance and effectively alleviates the reduction in pumping efficiency caused by screen blockage. At the same time, the low-pressure zone at the center of the vortex helps to draw water from the sedimentation pipe, achieving continuous disturbance and transport of compacted sediment within the pipe.

[0021] 5. By decoupling the radial movement and circumferential rotation of the spoiler through the guiding component, the spoiler maintains its predetermined posture during extension, contraction, and rotation, improving motion accuracy and operational reliability. In this scheme, the guide component applies directional constraints to the radial displacement of the spoiler, while the guide carrier rotates synchronously with the spoiler, ensuring radial stability of the spoiler during rotation and preventing skewness or vibration due to the swirling reaction force. This guarantees the stability of swirling generation. Furthermore, it ensures consistent movement when multiple spoilers contract and expand synchronously, avoiding skewness or jamming due to uneven force, and ensuring accurate and timely switching between the well-washing state and normal production and irrigation state.

[0022] 6. By isolating the packer components from the settling chamber, the migration of gravel to the lower disturbance chamber is effectively blocked during normal production and injection. In this scheme, the packer components normally block the longitudinal channel, causing the gravel that enters the settling pipe with the water flow during pumping to settle and accumulate in the settling chamber above the packer components. This prevents the gravel from entering the space where the drive and telescopic mechanisms are located below, thus protecting the drive motor, transmission mating surfaces, and hinged moving parts from the intrusion of gravel. This maintains a clean operating environment for all moving parts, reduces the risk of jamming and failure of downhole mechanisms due to sand wear, and extends the maintenance-free operation cycle of the unit during normal production and injection.

[0023] 7. By coordinating the pressure relief hole with the horizontal position adjustment component to reduce the driving load when the baffle retracts inward, the sensitivity of the electric actuator in the high water pressure environment of deep wells is improved. In this solution, the pressure relief hole eliminates the water pressure difference inside and outside the sand dredging pipe during the baffle retraction process, allowing the strut mechanism and casing to complete the baffle retraction without overcoming the reverse force of the high-pressure water outside the pipe. This reduces the power requirement and mechanical wear of the lifting adjustment component, while avoiding sluggish or jammed retraction action caused by water pressure difference.

[0024] 8. By using a closed-loop mechanism between the position sensor and the drive assembly, precise positioning of the spoiler's rotation phase and the slot position is achieved, ensuring consistent reset under long-term repetitive operation. In this solution, the position sensor detects the absolute rotation angle of the shaft in real time, enabling the spoiler to accurately stop at the phase corresponding to the slot after the well washing process. This ensures precise engagement of the spoiler and slot during reverse ejection, forming a reliable seal with the sealing ring inside the slot. This avoids sealing failure or operational interference caused by phase deviation, providing control-level assurance for the long-term reliable operation of the device downhole. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the installation status of the drive motor; Figure 3 This is a schematic diagram of the sand settling pipe. Figure 4 Schematic diagram of the internal structure of the sedimentation pipe Figure 1 ; Figure 5 Schematic diagram of the internal structure of the sedimentation pipe Figure 2 ; Figure 6 This is a schematic cross-sectional view of the sedimentation pipe. Figure 7 For along Figure 6 Schematic diagram of the cross-sectional structure along line AA; Figure 8 This is a schematic diagram of the assembly structure of the aerodynamic component and the horizontal position adjustment component; Figure 9 This is a schematic diagram of the assembly structure of the spoiler and guide components; Figure 10 This is a schematic diagram of the assembly structure of the aerodynamic components and the rotating shaft; Figure 11 Schematic diagram of the assembly structure of the shaft and sleeve Figure 1 ; Figure 12 Schematic diagram of the assembly structure of the shaft and sleeve Figure 2 ; Figure 13 Schematic diagram of the assembly structure of the rotating shaft and the sealing assembly; Figure 14 This is a schematic diagram of the enclosure component. Figure 15 This is a schematic diagram of the spoiler structure.

[0026] In the diagram: 1. Sand settling pipe; 2. Sand suction pipe; 201. Through groove; 202. Support plate; 203. Mechanical seal; 204. Pressure relief hole; 3. Baffle assembly; 301. Baffle plate; 3011. Guide block; 4. Horizontal position adjustment assembly; 401. Sleeve; 4011. Slider; 402. Support rod; 403. Hinge seat; 5. Drive assembly; 501. Rotating shaft; 5011. Slide groove; 502. Drive motor; 503. Motor mounting sleeve; 504. 505. Support rod; 6. Guide assembly; 601. Rotary ring; 602. Guide frame; 603. Guide rod; 604. Guide hole; 605. Anti-detachment plate; 7. Lifting and adjusting assembly; 701. Electric push rod; 702. Piston; 703. Circular ring; 704. Fixing frame; 8. Sealing assembly; 801. Sealing plate; 802. Conical groove; 803. Through hole; 804. Partition plate; 805. Guide plate; 806. Connecting rod; 9. Position sensor. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the geothermal well integrated production and injection device provided in this solution is applied to the geothermal well concentric production and injection string. The string includes an inner pipe and an outer pipe fitted outside the inner pipe. The annulus between the inner and outer pipes is the reinjection water channel. The inner pipe string is arranged from top to bottom as a submersible pump, a central pumping pipe, a pumping screen pipe and a sand settling pipe 1. The sand settling pipe 1 is a cylindrical pipe body. Its upper end is connected to the lower end of the pumping screen pipe. The lower end of the sand settling pipe 1 is connected to the upper end of the sand pumping pipe 2 through a threaded connection. The lower end of the sand pumping pipe 2 is fitted with a bottom-sealed motor mounting cylinder 503 through a threaded connection. The inner cavity of the sand settling pipe 1 is used to collect the sand and gravel carried in the backflow, so that the sand and gravel settle and accumulate under the action of gravity. The sand pumping pipe 2 serves as the main flow channel for water and sand and gravel during backflow well washing. Its cavity integrates a flow disturbance component 3, a horizontal position adjustment component 4, a drive component 5, a guide component 6, a lifting adjustment component 7, a sealing component 8, and a position sensor 9. Each component is arranged sequentially from top to bottom along the axial direction of the sand pumping pipe 2 and cooperates with each other.

[0029] like Figure 3 , Figure 4 As shown, the sand-dredging pipe 2 is a cylindrical pipe body with multiple through grooves 201 on its outer circumference. These through grooves 201 are evenly distributed along the circumference of the sand-dredging pipe 2 and spaced apart axially. The length of each through groove 201 extends axially along the sand-dredging pipe 2, and its width extends circumferentially. Each through groove 201 contains a baffle plate 301. The shape of the baffle plate 301 conforms to the inner contour of the through groove 201. Under normal irrigation conditions, the baffle plate 301 is embedded within the through groove 201, and its outer surface is flush with the outer wall of the sand-dredging pipe 2 to ensure proper drainage. The smoothness of the outer wall of the sand-draining pipe 2 reduces the resistance to the fluid in the well, and a sealing ring that fits against the outer circumference of the baffle plate 301 is fixedly installed in the through groove 201; a pressure relief hole 204 is also provided on the pipe wall of the sand-draining pipe 2. The pressure relief hole 204 is a circular through hole. The pressure relief hole 204 is used to balance the water pressure inside and outside the sand-draining pipe 2 when the baffle plate 301 contracts inward, so that the pressure difference between the inner cavity of the sand-draining pipe 2 and the external annulus can be eliminated, thereby reducing the contraction resistance of the baffle plate 301 and ensuring that the horizontal position adjustment component 4 can smoothly pull the baffle plate 301 back into the sand-draining pipe 2.

[0030] like Figure 5 , Figure 15 As shown, the turbulence assembly 3 includes all the turbulence plates 301 and a guide block 3011 fixedly installed on the inner side of each turbulence plate 301. The turbulence plate 301 is an arc-shaped plate structure with its inner side facing the central axis of the sand dredging pipe 2. The guide block 3011 is inclinedly arranged on the inner side of the turbulence plate 301, forming an acute angle between the guide block 3011 and the inner side of the turbulence plate 301. The inclination direction of the guide block 3011 is set along the circumference of the sand dredging pipe 2, so that when the turbulence plate 301 rotates, the guide block 3011 can apply a circumferential thrust to the water flow and guide the water flow obliquely upward, thereby enhancing the rotational speed and upward axial speed of the water flow. When all the turbulence plates 301 rotate synchronously, the turbulence plates 301 and the guide block 3011 jointly push the groundwater in the sand dredging pipe 2 to rotate, forming a spiral upward vortex.

[0031] like Figure 5 , Figure 12-13As shown, the horizontal position adjustment assembly 4 includes a sleeve 401, multiple support rods 402, and multiple hinge seats 403. The sleeve 401 is a cylindrical component, coaxially sleeved on the outer circumference of the rotating shaft 501. The inner diameter of the sleeve 401 is slightly larger than the outer diameter of the rotating shaft 501, with a sliding gap between them. Multiple axially extending grooves 5011 are formed on the outer circumference of the rotating shaft 501. Each groove 5011 is a rectangular cross-section groove, and the multiple grooves 5011 are evenly distributed circumferentially on the rotating shaft 501. Slider blocks 4011, corresponding one-to-one with each groove 5011, are fixedly connected to the sleeve 401. The sliders 4011 are embedded in the grooves 5011 and can slide axially within the grooves 5011. A gap is left between the mating surfaces of 011. The radial thickness of the slider 4011 is less than the depth of the groove 5011, ensuring that the sleeve 401 can slide freely along the axial direction of the rotating shaft 501 and rotate synchronously with the rotating shaft 501. Both ends of the sleeve 401 are provided with axial seals that cooperate with the rotating shaft 501. The axial seal is a sealing ring fitted around the outer circumference of the rotating shaft 501. The outer edge of the sealing ring is interference-fitted with the inner wall of the sleeve 401, and the inner edge is in sliding contact with the outer wall of the rotating shaft 501. This is used to prevent water and sand particles in the sand pumping pipe 2 from entering the mating gap between the groove 5011 and the slider 4011.

[0032] like Figure 8 As shown, each spoiler 301 is connected to the sleeve 401 via at least two parallel struts 402. The strut 402 is a straight rod with a uniform cross-section, and its two ends are hinged to the sleeve 401 and the spoiler 301 respectively via hinge seats 403. The hinge seat 403 is a U-shaped seat, fixedly connected to the outer wall of the sleeve 401 or the inner side of the spoiler 301. The hinge seat 403 has a pin hole, and the two ends of the strut 402 are hinged to the corresponding hinge seat 403 via pins. Rubber sealing sleeves are fitted at the connection points between the strut 402 and the hinge seat 403, covering the pins and the hinge seat 403. The hinge gap is external to prevent sand particles from entering the hinge mating surface and causing wear or jamming; multiple struts 402 are evenly distributed around the circumference of the sleeve 401, and the two struts 402 connected to the same spoiler 301 are axially spaced and parallel to each other to form a parallelogram linkage mechanism; when the sleeve 401 moves axially along the rotating shaft 501, the struts 402 rotate around the hinge seat 403, driving all spoilers 301 to synchronously extend and retract radially, realizing the extension and retraction of spoilers 301 in the through slot 201.

[0033] like Figure 2As shown, the drive assembly 5 includes a rotating shaft 501 and a drive motor 502. The rotating shaft 501 is vertically arranged along the axis of the sand-draining pipe 2. The lower end of the rotating shaft 501 passes through the support plate 202 and is coaxially and fixedly connected to the output end of the drive motor 502. The drive motor 502 is fixedly installed at the bottom of the support plate 202. The support plate 202 is fixedly installed on the inner wall of the sand-draining pipe 2 and located above the motor mounting cylinder 503. The support plate 202 separates the motor mounting cylinder 503 from the flow cavity at the top of the sand-draining pipe 2. The entire drive motor 502 is located inside the closed motor mounting cylinder 503 to avoid contact with the water flow. A sealing ring is provided on the mating end face of the motor mounting cylinder 503 and the sand-draining pipe 2. A mechanical seal 203 is provided between the rotating shaft 501 and the support plate 202. The mechanical seal 203 is a spring-type mechanical seal, which is fitted at the position where the rotating shaft 501 passes through the support plate 202. The stationary ring of the mechanical seal 203 is fixed. On the support plate 202, the moving ring rotates with the rotating shaft 501, and the end faces of the stationary ring and the moving ring are tightly fitted to form a sealing surface to prevent the upper water flow from entering the motor mounting cylinder 503 along the gap between the rotating shaft 501 and the support plate 202. The rotating shaft 501 is also equipped with a position sensor 9 for detecting its rotation position. The position sensor 9 is any one of an absolute magnetic encoder, an angle sensor, or a Hall sensor, and is fixedly installed at the lower end of the rotating shaft 501. The detection end of the position sensor 9 is coaxially connected to the rotating shaft 501 or senses the absolute angle of the rotating shaft 501 through a magnetic element. It is used to detect the absolute rotation angle or the number of rotations of the rotating shaft 501, so that the baffle 301 can accurately stop at the phase corresponding to the through groove 201 after rotation, and ensure that the baffle 301 can accurately embed into the through groove 201 when the irrigation state is restored.

[0034] When the baffle 301 is fully inside the sand dredging pipe 2, the drive motor 502 is started. The rotating shaft 501 drives the sleeve 401 to rotate through the sliding groove 5011 and the slider 4011. The sleeve 401 drives all the baffles 301 to rotate synchronously through the support rod 402. The baffles 301 and the guide block 3011 drive the groundwater in the sand dredging pipe 2 to rotate and form an upward vortex. Since the sleeve 401 and the rotating shaft 501 form an axial sliding and circumferential synchronous cooperation relationship through the sliding groove 5011 and the slider 4011, the rotation of the sleeve 401 is not restricted by the lifting adjustment component 7. The rotational cooperation between the ring 703 and the piston 702 ensures that the sleeve 401 can rotate freely with the rotating shaft 501, while the piston 702 and the electric push rod 701 remain stationary.

[0035] like Figure 4As shown, the lifting adjustment assembly 7 includes multiple electric push rods 701, pistons 702, rings 703, and a fixing frame 704. Multiple electric actuators 701 are evenly distributed inside the sand-dredging pipe 2 and fixedly installed on the support plate 202. The electric actuators 701 are vertically arranged along the axial direction of the sand-dredging pipe 2, with their fixed ends fixedly connected to the support plate 202 and their movable ends extending upwards. The movable ends of all electric actuators 701 are fixedly connected to a piston 702. The piston 702 is a disc-shaped component located above the support plate 202 and coaxially arranged with the rotating shaft 501. The rotating shaft 501 passes through the piston 702 and the support plate 202 from top to bottom. A central hole is opened in the center of the piston 702 for the rotating shaft 501 to pass through. The inner wall of the central hole can slide relative to the rotating shaft 501 and is equipped with a sealing element, which is an O-ring or a Y-ring, to prevent water from passing through the gap between the piston 702 and the rotating shaft 501. A ring 703 is rotatably installed on the top of the piston 702, and the ring 703 is coaxially arranged with the piston 702. The ring 703 can rotate freely relative to the piston 702 around the axis of the rotating shaft 501. A sealed bearing is provided between the ring 703 and the piston 702. The sealed bearing is a rolling bearing or a sliding bearing. The inner ring of the bearing is fixedly connected to the piston 702, and the outer ring is fixedly connected to the ring 703. This allows the ring 703 to withstand axial loads while rotating flexibly relative to the piston 702. A fixed bracket 704 is fixedly connected to the ring 703. The fixed bracket 704 is a rigid connecting piece. Its lower end is fixedly connected to the ring 703, and its upper end is fixedly connected to the sleeve 401. The fixed bracket 704 connects the ring 703 and the sleeve 401 into a whole, so that the sleeve 401 can move axially with the piston 702. At the same time, the rotation of the sleeve 401 can be achieved through the rotational cooperation between the ring 703 and the piston 702, without driving the piston 702 and the electric push rod 701 to rotate.

[0036] like Figure 5 As shown, when the electric actuator 701 extends or retracts, it drives the piston 702 to move axially along the rotating shaft 501. The ring 703 and the fixed bracket 704 drive the sleeve 401 to move axially. The sleeve 401 drives all the spoilers 301 to retract or extend synchronously through the support rod 402. When the sleeve 401 rotates with the rotating shaft 501, the ring 703 rotates relative to the piston 702, keeping the piston 702 and the electric actuator 701 stationary, thus preventing the electric actuator 701 from being damaged due to circumferential force.

[0037] like Figure 9As shown, the guide assembly 6 includes two rotating rings 601, multiple guide frames 602, multiple guide rods 603, and multiple anti-detachment plates 605. The two rotating rings 601 are annular components, rotatably mounted inside the sand-dredging pipe 2, and located above and below the spoiler 301, respectively. A sealed bearing is provided between the outer circumferential surface of the rotating ring 601 and the inner wall of the sand-dredging pipe 2, allowing the rotating ring 601 to rotate freely around the axis of the sand-dredging pipe 2. Each rotating ring 601 is fixedly mounted with a guide frame 602 corresponding to the spoiler 301. The guide frame 602 is a rigid support, fixedly connected to the inner side (or end face) of the rotating ring 601, and extends towards the spoiler 301. A guide hole 604 is opened on the side of the guide frame 602 facing the spoiler 301. The guide hole 604 is a circular through hole. The guide rod 603 is a cylindrical rod, passing through the guide hole 604 and slidingly engaging with it. One end of 03 is fixedly connected to the opposite spoiler 301, and the other end is fixedly installed with an anti-detachment plate 605. The anti-detachment plate 605 is a circular flat plate with a diameter larger than the diameter of the guide hole 604 to prevent the guide rod 603 from coming out of the guide hole 604. When the horizontal position adjustment component 4 drives the spoiler 301 to extend and retract radially, the guide rod 603 slides radially in the guide hole 604 to guide the radial movement of the spoiler 301, ensuring the stability of the extension and retraction direction of the spoiler 301 and avoiding the spoiler 301 from deflecting or getting stuck during the extension and retraction process. When the spoiler 301 rotates, the guide rod 603 drives the rotating ring 601 to rotate synchronously through the guide frame 602, so that the guide component 6 provides guidance for the radial movement of the spoiler 301 without restricting its circumferential rotation.

[0038] like Figure 10 , Figure 11 As shown, a collar 504 is fixedly installed on the upper end of the rotating shaft 501. The outer periphery of the collar 504 is provided with a support rod 505 that is fixedly connected to the guide frame 602 located above, thereby providing support and limiting effect on the upper end of the rotating shaft 501 and improving the stability of the rotating shaft 501 when it rotates.

[0039] like Figure 14As shown, the sealing assembly 8 is located above the rotating shaft 501 and includes a sealing plate 801, a conical groove 802, a through hole 803, a partition plate 804, and a connecting rod 806. The sealing plate 801 is a circular plate, which is fixedly installed on the inner wall of the sand extraction pipe 2 and located above the baffle plate 301. The sealing plate 801 divides the inner cavity of the sand extraction pipe 2 into an upper sand settling chamber and a lower baffle chamber. The bottom of the sealing plate 801 has an upwardly narrowing conical groove 802. The conical groove 802 is a conical groove with its large end opening downward and its small end opening upward. The top of the conical groove 802 has a through hole 803. The through hole 803 passes through the sealing plate 801 along the axial direction of the sand extraction pipe 2. The through hole 803 is a circular hole with a diameter smaller than the diameter of the large end of the conical groove 802. The baffle 804 is disposed in and cooperates with the through hole 803. The baffle 804 is a circular plate component, and its outer diameter is adapted to the inner diameter of the through hole 803. The baffle 804 is fixedly connected to the hinge seat 403 located above by the connecting rod 806, so that it rises and falls synchronously with the sleeve 401. The connecting rod 806 is a rigid straight rod, the upper end of which is fixedly connected to the hinge seat 403 located above, and the lower end is fixedly connected to the baffle 804. The connecting rod 806 passes through the space below the sealing plate 801 and does not affect the rotation and extension of the spoiler 301.

[0040] like Figure 5 As shown, under normal irrigation and drainage conditions, the baffle 804 is located inside the through hole 803 and blocks the through hole 803. The sand and gravel in the water flow settle on the upper surface of the sealing plate 801 and the top of the baffle 804. The sand and gravel are blocked above the sealing plate 801 and will not enter the lower part of the sand pumping pipe 2. When the casing 401 descends, the baffle 804 moves downward with the casing 401 and leaves the through hole 803, thereby opening the through hole 803 and allowing the sand settling pipe 1 to be directly connected to the lower part of the sand pumping pipe 2 through the through hole 803. During well cleaning, by moving the baffle 301 and the baffle 804, the sand settling pipe 1 can be directly connected to the well through the sand pumping pipe 2. After the through groove 201 is opened, the water in the well flows into the inner cavity of the sand pumping pipe 2 through the through groove 201, flushing the sand and gravel in the sand pumping pipe 2 upward.

[0041] like Figure 6-8 As shown, the inner wall of the sand dredging pipe 2 is also fixedly installed with multiple guide plates 805 evenly distributed in a ring. The guide plates 805 are all inclined and located below the sealing plate 801. The guide plates 805 are arc-shaped flat plates or straight plates, and their inclination direction is adapted to the rotation direction of the baffle plate 301. They are used to further guide the vortex formed by the rotation of the baffle plate 301 upward, enhance the axial velocity of the water flow, and improve the sand carrying capacity of the water flow. The guide block 3011 set on the inner side of the baffle plate 301 works together with the guide plate 805 to make the water flow form a stable spiral upward flow state in the sand dredging pipe 2.

[0042] like Figure 1As shown, during normal water intake and irrigation, the baffle plate 301 is located inside the permeable channel 201, sealing the channel 201. The baffle plate 804 blocks the through hole 803. Formation water enters the central pumping pipe through the pumping screen pipe, and reinjection water is injected through the annulus between the inner and outer pipes. Gravel settles on the top of the sealing plate 801 and the baffle plate 804. When well cleaning is required, the casing 401 is lowered by the electric actuator 701, which retracts the baffle plate 301 into the sand-draining pipe 2. At the same time, the baffle plate 804 is lowered to open the through hole 803. The permeable channel 201 and the through hole 803 connect the inside and outside of the sand-draining pipe 2 and the sand-settling pipe 1. The drive motor 502 is started to rotate the baffle plate 301. The water flow rotates to form an upward vortex, carrying gravel through the pumping screen pipe and the central pumping pipe, and is then pumped to the surface by the submersible pump. The rotating water flow cleans the screen holes.

[0043] The usage method and operating procedures of this device are as follows: Step 1, Normal Pumping and Recharge Status. The movable end of the electric actuator 701 is extended, the piston 702 is positioned above, the sleeve 401 is at its top dead center, and the support rod 402 pushes the baffle 301 outward into the through-hole 201, sealing the through-hole 201. Simultaneously, the baffle 804 is positioned within the through-hole 803 and seals it. When the submersible pump is pumping water, groundwater enters the central pumping pipe through the pumping screen pipe, and recharge water is injected through the annulus between the inner and outer pipes. Gravel gradually settles within the settling pipe 1 onto the top of the sealing plate 801 and the baffle 804.

[0044] Step 2, Well Cleaning and Connection. When it is necessary to remove sediment, start the electric actuator 701 so that its movable end retracts downward. The piston 702, ring 703, fixed frame 704 and casing 401 descend synchronously. The casing 401 pulls all the baffles 301 inward through the support rod 402 until they are fully inside the sand-draining pipe 2. The through groove 201 opens, and the inner cavity of the sand-draining pipe 2 is connected to the annulus inside the well through the through groove 201. At the same time, the casing 401 drives the baffle 804 to descend through the connecting rod 806 and opens the through hole 803. The sand and gravel in the sedimentation pipe 1 enter the lower part of the sand-draining pipe 2 through the conical groove 802 and the through hole 803 under the action of gravity and water flow. The pressure relief hole 204 balances the water pressure inside and outside the sand-draining pipe 2, which facilitates the inward retraction of the baffles 301.

[0045] Step 3: Swirling Disturbance and Sand Dredging. After the swirl plate 301 is fully inserted into the sand dredging pipe 2, the drive motor 502 is started. The rotating shaft 501 drives the sleeve 401, support rod 402, and swirl plate 301 to rotate through the slide groove 5011 and slider 4011. The guide rod 603, guide frame 602, and rotating ring 601 of the guide assembly 6 rotate synchronously with the swirl plate 301. The swirl plate 301 and the guide block 3011 push the groundwater in the sand dredging pipe 2 to rotate and form an upward swirling flow. The guide plate 805 further guides the water flow upward. The water flow carries sand and gravel through the sand dredging pipe 2 and the sedimentation pipe 1 upward into the water sluice screen pipe and the central water sluice pipe, and is pumped out to the ground by the submersible pump. When the rotating water flows through the water sluice screen pipe, it cleans the screen holes. The position sensor 9 detects the rotation position of the rotating shaft 501 in real time and controls the rotation phase of the swirl plate 301.

[0046] Step 4, Resume Production and Irrigation. After the well washing and refluxing are completed, turn off the drive motor 502. Based on the detection signal from the position sensor 9, adjust the baffle 301 to the phase corresponding to the through groove 201. Reverse start the electric actuator 701 so that its movable end extends upward. The piston 702, ring 703, fixing frame 704 and casing 401 rise. The support rod 402 pushes the baffle 301 outward into the through groove 201. The baffle 804 rises with the casing 401 and re-seals the through hole 803. The device returns to normal production and irrigation status.

[0047] In explaining this invention, it should be noted that the terms indicating location are used only for ease of description and understanding, and are not intended to limit the installation location of specific technical features. Other possible installation methods are not excluded.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. If these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. An integrated geothermal well production and irrigation device, comprising a sand settling pipe (1), characterized in that: The lower end of the sand-collecting pipe (1) is provided with a sand-draining pipe (2). The sand-draining pipe (2) is provided with a flow-disrupting component (3) for stirring the water flow in the pipe during well washing. The outer periphery of the sand-draining pipe (2) is provided with several through slots (201). The flow-disrupting component (3) includes a flow-disrupting plate (301) set in the through slot (201). The flow-disrupting plate (301) can be retracted into the sand-draining pipe (2) by a horizontal position adjustment component (4). The sand-draining pipe (2) is provided with a drive component (5) that drives the flow-disrupting plate (301) to rotate when it is fully inserted into the sand-draining pipe (2), so that the flow-disrupting plate (301) drives the groundwater in the sand-draining pipe (2) to rotate and generate an upward vortex.

2. The integrated geothermal well extraction and irrigation device according to claim 1, characterized in that: The drive assembly (5) includes a rotating shaft (501) for driving the spoiler (301) and the horizontal position adjustment assembly (4) to rotate synchronously. The rotating shaft (501) is driven to rotate by a drive motor (502).

3. The integrated geothermal well extraction and irrigation device according to claim 2, characterized in that: The horizontal position adjustment component (4) includes a sleeve (401) that slides axially with the rotating shaft (501). The sand extraction pipe (2) is provided with a lifting adjustment component (7) that drives the sleeve (401) to move axially along the rotating shaft (501). The sleeve (401) drives all the spoilers (301) to retract synchronously through multiple support rods (402) set on its outer periphery.

4. The integrated geothermal well production and irrigation device according to claim 3, characterized in that: The two ends of the strut (402) are respectively hinged to the sleeve (401) and the spoiler (301) through the hinge seat (403). Each spoiler (301) is connected to the sleeve (401) through at least two struts (402) arranged in parallel with each other.

5. The integrated geothermal well production and irrigation device according to claim 3, characterized in that: The outer periphery of the rotating shaft (501) is provided with a plurality of sliding grooves (5011) extending along its axial direction, and a slider (4011) that is fixedly connected to the sleeve (401) is slidably installed in the sliding groove (5011).

6. The integrated geothermal well production and irrigation device according to claim 3, characterized in that: The lifting adjustment assembly (7) includes several electric actuators (701) evenly distributed in the sand extraction pipe (2). A support plate (202) for installing the electric actuators (701) is fixedly installed in the sand extraction pipe (2). The movable ends of all the electric actuators (701) are fixedly connected to the piston (702). A ring (703) is rotatably installed on the top of the piston (702). A fixing bracket (704) is provided on the ring (703) and fixedly connected to the sleeve (401). The rotating shaft (501) passes through the piston (702) and the support plate (202) from top to bottom.

7. The integrated geothermal well production and irrigation device according to claim 2, characterized in that: It also includes a guide assembly (6) set inside the sand dredging pipe (2). The guide assembly (6) includes two rotating rings (601) rotatably installed inside the sand dredging pipe (2). The two rotating rings (601) are distributed on the upper and lower sides of the spoiler (301). Each rotating ring (601) is fixedly installed with a guide frame (602) corresponding to the spoiler (301). A guide rod (603) is slidably fitted on the guide frame (602). One end of the guide rod (603) is fixedly connected to the opposite spoiler (301).

8. The integrated geothermal well production and irrigation device according to claim 3, characterized in that: It also includes a sealing assembly (8) set above the rotating shaft (501). The sealing assembly (8) includes a sealing plate (801) fixedly installed in the sand dredging pipe (2). A conical groove (802) is provided at the bottom of the sealing plate (801), and a through hole (803) is provided at the top of the conical groove (802). A partition plate (804) fixedly connected to the sleeve (401) is provided in the through hole (803).

9. The integrated geothermal well production and irrigation device according to claim 8, characterized in that: The sand extraction pipe (2) has several guide plates (805) that are evenly distributed in a ring on the inner wall. The guide plates (805) are all inclined and located below the sealing plate (801). The inner side of the baffle plate (301) is fixedly equipped with a guide block (3011).

10. The integrated geothermal well production and irrigation device according to claim 1, characterized in that: The rotating shaft (501) is equipped with a position sensor (9) for detecting its rotational position.

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