Traction expansion type same-layer recharge well

Abstract

An equal-diameter section and an expanded-diameter section are arranged in a well body, the expanded-diameter section is arranged in a water-containing sand layer, and the diameter of the expanded-diameter section is larger than that of the equal-diameter section; a well casing is arranged in the well body, a traction cable is arranged in the well casing, an expansion floral tube is hung on the traction cable, an extension hole is formed in the diameter expansion section of the well casing, the expansion floral tube is arranged at the position of the extension hole, and horizontal expansion of the expansion floral tube is achieved when the traction cable is vertically pulled. When the expanding floral tube works, the expanding floral tube is completely and horizontally expanded in the expanding section, and the recharge efficiency is effectively improved through the design; when the recharge well works, the recharge well is connected with earth surface oscillation equipment and high-pressure water equipment at the same time, internal well wall attachment cleaning is achieved by expanding vibration waves through the vibration piece, internal attachment cleaning is achieved by matching high-pressure water with the nozzle, and the aim of ensuring smooth water flow in the well pipe is achieved. And the recharge permeation efficiency of the expanded floral tube to the water-containing sand layer is improved.

Description

Technical Field

[0001] This utility model relates to the field of heating reinjection well technology, and in particular to a pull-expand type intra-layer reinjection well. Background Technology

[0002] Geothermal resources, as a clean energy source, have been widely used in heating systems due to their low cost and high efficiency.

[0003] Geothermal resources are obtained by extracting groundwater, using above-ground equipment to extract the heat and cold resources from the water, and then reinjecting it back underground. Water is used as a medium to extract heat from underground to the surface for use, thereby reducing the loss of surface energy. However, in order to ensure the balance between underground and above-ground resources in the whole recycling process, it is necessary to reinject an equal amount of extracted groundwater back underground.

[0004] In existing technologies, the commonly used seepage recharge well technology has drawbacks, namely: 1. During the recharge process, impurities in the underground environment and the recharge water source can easily clog the recharge hole. Therefore, the well body cannot be cleaned, and the clogged recharge hole directly leads to a significant reduction in the recharge efficiency of the well body, or even the eventual scrapping of the well body; 2. Because the recharge area of ​​the recharge well is concentrated in the sandy soil layer, the existing recharge wells cannot improve the recharge efficiency in the sandy soil layer.

[0005] In view of the shortcomings of the existing technology mentioned above, the technical problem that urgently needs to be solved by the technical personnel in this industry is: to design a pull-expand type in-layer recharge well, the purpose of which is to increase the recharge efficiency of the recharge zone, while keeping the recharge area inside the well clean and avoiding impurities from clogging the inside of the well. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a pull-expand type in-situ reinjection well, which improves the internal structure of the existing reinjection well and, in conjunction with a surface auxiliary system, can achieve internal cleaning of the well body under liquid impact at different frequency bands, while also improving reinjection efficiency.

[0007] A pull-expanded in-layer reinjection well includes a well body, in which a constant diameter section and an enlarged diameter section are provided. The enlarged diameter section is located in a water-bearing sand layer and the diameter of the enlarged diameter section is larger than the diameter of the constant diameter section.

[0008] The well body is equipped with a well pipe, and a pull cable is installed inside the well pipe. An extension tube is suspended on the pull cable. An extension hole is provided on the well pipe in the enlarged section. The extension tube is located at the extension hole. When the pull cable is pulled vertically, the extension tube is horizontally expanded.

[0009] The extended tube is provided with a hinge seat for fixing to the hinge shaft on the traction cable. The outer wall of the extended tube is provided with a water seepage hole and a clearance groove. The extended tube is provided with a top water guide notch near the hinge seat.

[0010] The inner wall of the extended tube is fixed with a fixing component to secure the nozzle. The nozzle includes a connecting section and a tube body. A rotating core is provided inside the tube body. Axial through holes are provided in the connecting section, the tube body, and the rotating core. A gap is provided between the rotating core and the tube body. A guide hole is provided between the axial through hole of the rotating core and the gap. A turbulence groove is provided around the rotating core in an annular or spiral shape to promote high-speed rotation of the rotating core. The rotating core extends to the outside of the tube body and is connected to a cleaner at its end. The cleaner is provided with several spray holes. A pressure relief hole is provided on the tube body and connected to the gap.

[0011] The well pipe is composed of multiple sections connected as one unit. A vibrating element is fixed at the connection of the well pipe. The vibrating element includes a fixed flange with a water permeable groove. An elastic cylinder is installed below the fixed flange. The wall thickness of the elastic cylinder is less than 0.1 mm. The elastic cylinder is provided with an elastic bend and is flared.

[0012] This invention has the following beneficial effects: Through the above design, the well body is equipped with a constant-diameter section and an enlarged-diameter section. The enlarged-diameter section is located within the aquifer and has a diameter larger than that of the constant-diameter section. A well pipe is installed inside the well body, and a pull cable is installed inside the well pipe. An extended perforated pipe is suspended from the pull cable. An extension hole is provided on the well pipe in the enlarged-diameter section, and the extended perforated pipe is located at the extension hole. When the pull cable is pulled vertically, the extended perforated pipe expands horizontally. When the extended perforated pipe is in operation, it fully expands horizontally within the enlarged-diameter section. This design effectively increases the reinjection efficiency. When the reinjection well is in operation, it is connected to a surface vibration device and also to a high-pressure water device. The vibration wave is amplified by the vibrating element to clean the internal well wall deposits, and the high-pressure water, in conjunction with the nozzle, cleans the internal deposits of the extended perforated pipe. The purpose is to ensure smooth water flow within the well pipe and improve the reinjection permeability efficiency of the extended perforated pipe into the aquifer. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the well casing structure;

[0016] Figure 3 To expand the three-dimensional structure diagram of the flower tube;

[0017] Figure 4 A schematic diagram of the expanded flower tube cross-section structure;

[0018] Figure 5 A schematic diagram of the side structure of the extended flower tube;

[0019] Figure 6 This is a schematic diagram of the three-dimensional structure of the vibrating component;

[0020] Figure 7 This is a schematic diagram of the nozzle's three-dimensional structure;

[0021] In the diagram, 1. Well body, 11. Constant diameter section, 12. Expanded diameter section, 13. Pull cable, 2. Well casing, 21. Extension hole, 3. Vibrating component, 31. Fixed flange, 32. Water permeable groove, 33. Through hole, 34. Elastic cylinder, 4. Extended perforated pipe, 41. Pipe body, 42. Circumvention groove, 43. Top water guide notch, 44. Hinge seat, 45. Water seepage hole, 46. Top water seepage hole, 47. Snap ring, 5. Nozzle, 51. Connecting section, 52. Cleaner, 521. Jet hole, 53. Pipe body, 54. Rotating core, 541. Pressure relief hole, 542. Turbulence groove, 543. Through hole. Detailed Implementation

[0022] The present invention will be described in detail below. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification.

[0023] Example 1:

[0024] A pull-expansion type same-layer reinjection well includes a well body 1, within which are a constant-diameter section 11 and an enlarged-diameter section 12. The enlarged-diameter section 12 is located within an aquifer. Since maximum reinjection efficiency can only be achieved within an aquifer, the diameter of the well body 1 within the aquifer is increased, thereby increasing the permeation diameter of the reinjection water through the enlarged-diameter section 12. Those skilled in the art can use a controllable enlargement drill bit during the forming of the well body 1. When the drill bit reaches the same depth as the aquifer in the corresponding pumping well, the controllable enlargement drill bit within the well body 1 changes diameter, increasing the opening diameter of the aquifer. In this embodiment, the diameter of the enlarged-diameter section 12 is processed to be twice or more the diameter of the constant-diameter section 11. This design further increases the reinjection area and facilitates smooth water reinjection.

[0025] In this pull-and-expand type intra-layer reinjection well, a well pipe 2 is installed inside the well body 1. A pull cable 13 is installed inside the well pipe 2. This pull cable 13 is usually made of stainless steel cable. An expansion tube 4 is suspended on the pull cable 13. Those skilled in the art can set the specific number of expansion tubes 4 according to the volume ratio of the well pipe 2 to the expansion tube 4. On the premise of not affecting the folding and extension of the expansion tube 4, the more expansion tubes 4, the better.

[0026] In this embodiment, the same number of extension holes 21 as the expansion tube 4 are provided on the side wall of the well pipe 2, corresponding to the enlarged diameter section 12. The expansion tube 4 is located at the corresponding extension hole 21, such as... Figure 2 As shown, in this embodiment, four extension holes 21 are evenly distributed at the same floor height. When the pull cable 13 is pulled vertically, the extension tube 4 is horizontally extended into the expansion section 12 at the extension hole 21.

[0027] Furthermore, a hinge seat 44 is provided at the end of the expansion tube 4 for fixing to the hinge shaft on the tension cable 13. A relief groove 42 is provided on the outer wall of the expansion tube 4. Those skilled in the art can directly select an integrally formed tension tube cut to a fixed length for use as the expansion tube 4. Holes can be drilled in the expansion tube 4 to serve as seepage holes 45. These seepage holes can also be located within the relief groove 42. Figure 3 The top seepage hole 46 is provided on the expansion tube 4. A top water guide notch 43 is also provided near the hinge seat 44. When multiple expansion tubes 4 are folded inside the well pipe, if the cross-section of the expansion tube 4 is circular, it will interfere with the pull cable 13 in the folded state. However, by adopting this design of the avoidance groove 42 and the top water guide notch 43, in the folded state, the side wall of the expansion tube 4 will form an avoidance space with the pull cable 13, further utilizing the space inside the well pipe 2 and increasing the storage volume of the expansion tube. In actual reinjection experiments, the aforementioned top water guide notch 43, in its horizontally extended state, is positioned towards the water inflow direction of the well pipe 2, maximizing the flow of reinjection water into the expansion tube 4.

[0028] When this equipment is in operation, an extension perforated pipe 4 is installed in the water-bearing sand layer. A pull cable 13 is lowered into the well casing 2 to hoist the extension perforated pipe 4. At this time, if... Figure 1 As shown, when approaching the aquifer, before the extended perforated pipe 4 is lowered into the reinjection well 2, it is suspended in the well casing 2 by the pull cable 13. At this time, the top of the extended perforated pipe 4 is raised and penetrates the extension hole 21, contacting the inner wall of the reinjection well 2. When the extended perforated pipe 4 enters the enlarged diameter section 12 area, the pull cable 13 pulls vertically upward, and the extended perforated pipe 4 penetrates the extension hole 21 and enters the enlarged diameter section 12 area. At this time, it is in a horizontally dispersed state, as shown. Figure 1 This design expands the permeability area of ​​the water-bearing sand layer to the surrounding area, effectively increasing the permeability area.

[0029] To further control the recharge flow of the recharge well, the applicant has made the following technical improvements, such as... Figure 4 , 5As shown in Figure 7, a retaining ring 47 is fixed on the inner wall of the expansion tube 4 as a fixing member. The nozzle 5 is fixed by the retaining ring 47. This nozzle 5 is permanently fixed and is lowered synchronously with the expansion tube 4 and is not removed after being lowered. The nozzle 5 includes a connecting section 51 and a tube body 53. A rotating core 54 is provided inside the tube body 53. Axial through holes are provided in the connecting section 51, the tube body 53, and the rotating core 54. A gap is provided between the rotating core 54 and the tube body 53. A guide hole 543 is provided between the axial through hole of the rotating core 54 and the gap. The rotating core 54 extends to the outside of the tube body 53 and is connected to a cleaner 52 at its end. The cleaner 52 is provided with several spray holes 521. A pressure relief hole 541 is provided on the tube body 53 and connected to the gap. A turbulence groove 542 is provided around the rotating core 54 in an annular or spiral shape to promote the high-speed rotation of the rotating core 54. As a device to work with the nozzle 5, a high-pressure pump is installed on the ground and connected to the nozzle 5 via a pipeline. This design allows high-pressure water to be guided into the nozzle 5. The rotating core 54 inside the nozzle 5 guides the liquid into the gap and discharges it through the pressure relief hole 541. During this process, the rotating core 54 is suspended between the connecting section 51 and the pipe body 53 and rotates at high speed under the impact of the high-pressure water flow. At the same time, it drives the cleaner 52 to rotate at high speed. The high-pressure liquid passes through several spray holes 521 to perform high-pressure flushing on the expansion tube 4 inside the expansion tube 4. This flushing will further improve the internal unobstructedness of the expansion tube 4 and improve the reinjection efficiency.

[0030] Furthermore, during cleaning operations, this pull-and-expand in-situ reinjection well is connected to a vibrating pump installed on the surface. The purpose is to remove deposits adhering to the well casing 2 and the inside of the extended perforated pipe 4 through vibration and impact. However, in actual operation, it was found that the vibration waves provided by the vibrating pump move along the axial direction of the well casing 2. Because the well casing 2 has a multi-segment connection structure, discontinuous fouling zones form inside the well casing 2. This phenomenon is more severe around the connection points. To improve these problems, this technical solution fixes a vibrating element 3 at the connection point of the well casing 2. Figure 1 , 6As shown, the vibrating element 3 includes a fixed flange 31, which is used to fix the vibrating element 3. When multiple sections of well pipe 2 are connected, the entire vibrating element 3 can be fixed by squeezing the fixed flange 31. A water-permeable groove 32 is provided on the fixed flange 31, and an elastic cylinder 34 is provided below the fixed flange. The elastic cylinder 34 has a wall thickness of less than 0.1 mm, and the elastic cylinder 34 is provided with continuous elastic corrugated bends and is flared. The fixed flange 31 and the elastic cylinder 34 have a flared through hole 53 at their axis. With the above structural configuration, during equipment operation and cleaning, the external oscillating pump transmits vibration waves to the well pipe 2. The elastic cylinder 34 on the vibrating element 3 converts the axial vibration waves into radial vibration waves. When the axial vibration waves and radial vibration waves occur simultaneously, they superimpose to maximize the vibration efficiency of the inner wall of the well pipe, remove the deposits on the pipe wall, and ensure the smooth flow of the reinjected liquid in the well pipe 2.

[0031] In summary, this utility model has a novel design. During use, the expansion tube 4 and the expansion section 12 work together to increase the area of ​​the reinjection zone. The use of the vibrating element 3 inside the well pipe 2 and the nozzle 5 inside the expansion tube 4 can promote the removal of deposits and keep the reinjection path smooth. Through actual reinjection experiments, the above system can improve the reinjection efficiency to over 98%, effectively ensuring the balance of groundwater. It overcomes many drawbacks of the existing technology and is an ideal pull-expansion type same-layer reinjection well.

Claims

1. A pull-apart, in-place, horizontal recharge well comprising a well body, characterized by: The well body is internally provided with an equal diameter section and an expanding section, the expanding section is arranged in a water-bearing sand layer, and the diameter of the expanding section is greater than that of the equal diameter section; The well body is internally provided with a well pipe, the well pipe is internally provided with a pulling cable, the expanding flower pipe is hung on the pulling cable, the well pipe is provided with an extension hole at the expanding section, and the expanding flower pipe is arranged at the extension hole, so that the horizontal expansion of the expanding flower pipe is realized when the pulling cable is vertically pulled.

2. A pull-apart, expanding, in-situ recharging well according to claim 1, wherein: The expanding flower pipe is provided with a hinged seat for fixing the hinged shaft on the pulling cable, the outer wall of the expanding flower pipe is provided with a water seepage hole, and the outer wall of the expanding flower pipe is further provided with an avoiding groove; the expanding flower pipe is provided with a top water guide notch near the hinged seat.

3. A pull-apart, expanding, in-situ recharging well according to claim 1, wherein: The inner wall of the expanding flower pipe is fixed with a fixing member, and the fixing member is used to fix the nozzle; the nozzle comprises a connecting section and a pipe body, a rotating core is arranged in the pipe body, axial through holes are arranged in the connecting section, the pipe body and the rotating core; a gap is arranged between the rotating core and the pipe body, a lead-through hole is arranged between the axial through hole of the rotating core and the gap, and a turbulence groove is annularly or spirally arranged on the periphery of the rotating core; the rotating core extends to the outside of the pipe body and is connected with a cleaner at the end, a plurality of injection holes are arranged on the cleaner; and a pressure relief hole is arranged on the pipe body and connected with the gap.

4. A pull-apart, expanding, in-situ recharging well according to claim 1, wherein: The well pipe is multi-sectioned and connected into one body, a vibration member is fixed at the connection of the well pipe, the vibration member comprises a fixed flange, a water permeable groove is arranged on the fixed flange, an elastic cylinder is arranged below the fixed flange, the wall thickness of the elastic cylinder is less than 0.1 mm, the elastic cylinder is elastically bent and is arranged in a horn shape.

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