Deep well synchronous circulation stable pumping and filling method

Abstract

The invention provides a deep well synchronous circulation stable pumping and irrigation method which comprises the following steps that S1, a plurality of deep wells extending into a deep aquifer are constructed along the ground, the sections, located in the deep aquifer, of the deep wells are water filtering sections, and the water filtering sections of different deep wells are consistent in height position; s2, part of the deep wells are selected as recharge wells, and part of the deep wells are selected as pumping wells; s3, pumping and irrigation equipment capable of pumping water and irrigating water is installed on the ground; and S4, recharge water is injected into the water filtering section of the recharge well through the pumping and recharge equipment, meanwhile, water in the water filtering section of the pumping well is pumped out through the pumping and recharge equipment, and forward circulation is formed through one-time water filling and one-time water pumping. According to the method, a small amount of water is pumped while irrigation is conducted, blockage formed by compaction of the deep aquifer during irrigation is dredged in a water pumping mode, certain flow is formed in the aquifer, the purpose of dredging is achieved in an irrigation and pumping synchronous circulation mode, the water permeability of the deep aquifer is improved, and long-term, stable and continuous recharge of underground water is guaranteed; and the use efficiency of the recharge well is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater pumping and irrigation, and in particular relates to a deep well synchronous circulation and stable pumping and irrigation method. Background Art

[0002] As we all know, groundwater plays an important role in resource, geological and ecological functions, and over-exploitation of groundwater will lead to ecological and geological problems such as ground subsidence, ground fissures, seawater intrusion and wetland degradation. Therefore, groundwater recharge is needed to increase groundwater resources, control and increase groundwater levels, and prevent adverse consequences such as water quality deterioration, ground subsidence or seawater intrusion caused by a sharp drop in groundwater levels.

[0003] Groundwater is generally recharged using recharge wells. For deep recharge wells, because they are far away from the surface and have large recharge resistance, the water needs to be pressurized and sent to the bottom of the recharge well. For example, as disclosed in CN202210774397.4, a pressure pump is provided on the recharge pipe to pump water from the water storage tank into the recharge well, and penetrate into the deep aquifer through the well pipe wall of the water filtration section. However, when the recharge water is pressurized in one direction to enter the deep aquifer, there is a compaction phenomenon (the phenomenon that the volume of the powder layer or agglomerate decreases when subjected to external pressure). The compaction will cause the deep aquifer to be blocked, reduce the permeability of the deep aquifer, and be unfavorable for the flow of water. In addition, the recharge well is prone to siltation, the recharge water volume decays rapidly, the maintenance time becomes shorter, and the use efficiency and life are greatly affected. Therefore, it is necessary to make improvements. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art, and the purpose of the present invention is to provide a deep well synchronous circulation stable pumping and filling method.

[0005] To achieve the above object, the present invention adopts the following technical solution: a deep well synchronous circulation stable pumping and injection method, comprising the following steps:

[0006] S1. Construction of multiple deep wells: Construction of multiple deep wells extending into the deep aquifer along the ground. The section of the deep well located in the deep aquifer is the water filtering section, and the other sections of the deep well are non-water filtering sections. The water filtering sections of different deep wells are consistent in height position;

[0007] S2, select some deep wells as recharging wells and some deep wells as pumping wells, and the recharging wells are located within the influence range of the water pressure drop when the pumping wells are pumping water;

[0008] S3. Install pumping and irrigation equipment: Install pumping and irrigation equipment on the ground that can pump and irrigate water;

[0009] S4. Simultaneous pumping and injection: The reinjection water is injected into the water filtering section of the reinjection well through the pumping and injection equipment, and the water in the water filtering section of the pumping well is pumped out through the pumping and injection equipment at the same time. The water is injected and pumped back and forth to form a positive cycle in the deep aquifer.

[0010] The above technical solution pumps a small amount of water while filling (the amount of water pumped is lower than the amount of water filled), and the blockage formed by the compaction of the deep aquifer during filling is cleared by pumping water, forming a certain flow in the aquifer, and the purpose of dredging is achieved by adopting the method of synchronous circulation of filling and pumping, thereby improving the permeability of the deep aquifer and deep wells, ensuring the long-term, stable and continuous recharge of groundwater, improving the service life of the recharge well, and extending the maintenance cycle of the deep well. The present invention can maintain the dynamic balance of the regional water level and solve the geological disasters caused by the decline of regional groundwater.

[0011] In a preferred embodiment of the present invention, the pumping and injection method further comprises the following steps: S5, at an interval, part or all of the pumping wells / re-injection wells are replaced with re-injection wells / pumping wells; at an interval, steps S4 and S5 are repeated, and water flows back and forth in the deep aquifer to maintain the stable circulation of water in the deep aquifer.

[0012] The above technical scheme, by exchanging recharge wells and pumping wells, circulates and converts the flow state and direction of groundwater between deep wells, discharges silt, reduces formation siltation, maintains the loose state of deep aquifers, restores the permeability of deep aquifers, makes the groundwater channels in deep aquifers continuously stable, and maintains the long-term dynamic balance of regional water levels.

[0013] In a preferred embodiment of the present invention, the pumping and irrigation equipment includes an irrigation storage tank, a pumping storage tank, an irrigation pump for irrigation, a pumping pump for pumping water, and an irrigation and irrigation water pipe extending into the water filtration section of each deep well; the water inlet of the irrigation pump is connected to the irrigation storage tank, the water outlet of the irrigation pump is connected in parallel to a plurality of irrigation branch pipes provided with irrigation valves, and the water outlets of the plurality of irrigation branch pipes are respectively connected to the irrigation and irrigation water pipe in each deep well; the water outlet of the pumping pump is connected to the pumping storage tank, the water inlet of the pumping pump is connected in parallel to a plurality of pumping branch pipes provided with pumping valves, and the water inlets of the plurality of pumping branch pipes are respectively connected to the irrigation and irrigation water pipe in each deep well.

[0014] The above technical scheme sets a water filling pump and a water extraction pump for the pumping and irrigation equipment in one area, and switches the flow direction of water in the water pumping and irrigation pipe by controlling the opening and closing of the water filling valve and the water extraction valve, so as to inject or extract water into the filtering section of the deep well, and can realize the interchange of pumping and irrigation, with simple structure and reliable operation.

[0015] In a preferred embodiment of the present invention, the water in the water filtering section of the pumping well pumped out by the pumping and irrigation equipment is used by the water source heat pump unit.

[0016] The above technical solution uses the pumped water for the water source heat pump unit, making full use of the characteristics of groundwater that is warm in winter and cool in summer, and utilizing geothermal energy.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the main arrangement of two deep wells in the embodiment. Figure 1 , the one on the left is the recharge well and the one on the right is the pumping well.

[0020] Figure 2 This is a schematic diagram of the main arrangement of two deep wells in the embodiment. Figure 2 , the one on the right is the recharge well and the one on the left is the pumping well.

[0021] Figure 3 Schematic diagram of top view of three deep wells in the embodiment.

[0022] Figure 4 This is a schematic diagram of the main configuration of three deep wells in the embodiment. Figure 1 The deep well at the middle corner of the triangle is a pumping well, and the remaining two deep wells are recharge wells.

[0023] Figure 5 This is a schematic diagram of the main configuration of three deep wells in the embodiment. Figure 2 The deep well at the middle corner of the triangle is the recharge well, and the remaining two deep wells are pumping wells.

[0024] The figure marks in the drawings of the specification include: deep well 1, water filtering section 11, irrigation storage box 2, irrigation pump 21, first irrigation branch pipe 22, second irrigation branch pipe 23, first irrigation valve 24, second irrigation valve 25, pumping storage box 3, pumping pump 31, first pumping branch pipe 32, second pumping branch pipe 33, first pumping valve 34, second pumping valve 35, irrigation and pumping water pipe 4. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0028] The present invention provides a deep well synchronous circulation stable pumping and filling method, such as Figure 1 As shown, in a preferred embodiment, the pumping method includes the following steps:

[0029] S1. Construction of multiple deep wells 1: multiple deep wells 1 are constructed along the ground and extend into the deep aquifer. The section of the deep well 1 located in the deep aquifer is the water filtering section 11, and the other sections of the deep well 1 are non-water filtering sections. The water filtering sections 11 of different deep wells 1 are consistent in height position.

[0030] S2, select part of deep well 1 as recharge wells and part of deep well 1 as pumping wells. The recharge wells are located within the influence range of the water pressure drop when the pumping wells are pumping water, ensuring that the recharge water volume is greater than the pumping water volume. Figure 1 As shown in the figure, two deep wells 1 are set up, the deep well 1 on the left is a recharge well, and the deep well 1 on the right is a pumping well. According to the actual situation, multiple recharge wells and corresponding pumping wells can be set up. The recharge wells can be set up one by one with the pumping wells, or multiple small pumping wells can be set up around the recharge wells, or multiple small recharge wells can be set up around the pumping wells. In practice, the number, diameter, depth and spacing of the deep wells can be determined according to the hydrogeological characteristics of the deep aquifer, while considering the impact of the project cost.

[0031] S3. Install pumping and irrigation equipment: Install pumping and irrigation equipment on the ground that can pump and irrigate water.

[0032] S4. Simultaneous pumping and recharging: The recharging water is injected into the water filtering section 11 of the recharging well by means of pumping and recharging equipment. The recharging method adopts pressure recharging or vacuum recharging. At the same time, a small amount of water is extracted from the water filtering section 11 of the pumping well by means of pumping and recharging equipment. A small amount of water is pumped out while the water is being injected. The water is injected and pumped out to form a positive cycle in the deep aquifer (for example, Figure 1The water shown flows from left to right in the deep aquifer. The water in the water filter section 11 of the pumping well pumped out by the pumping and irrigation equipment can be used by the water source heat pump unit, making full use of the characteristics of groundwater that is warm in winter and cool in summer, and utilizing geothermal energy.

[0033] In another preferred embodiment, the pumping method further comprises the following steps:

[0034] S5. After a period of time (e.g., one month), some or all of the pumping wells / recharge wells are replaced with recharge wells / pumping wells, that is, some or all of the pumping wells in step S4 are replaced with recharge wells, and some or all of the recharge wells in step S4 are replaced with pumping wells. Pumping and recharge are exchanged for a period of time (e.g., two days), and water forms a reverse circulation in the deep aquifer (e.g., Figure 2 Water is shown flowing from right to left in a deep aquifer).

[0035] After a period of time (for example, one month), steps S4 and S5 are repeated, and water flows back and forth in the deep aquifer to maintain the stable circulation of water in the deep aquifer. In this way, by frequently changing the direction of groundwater flow, the loose state of the deep aquifer is maintained, the permeability of the deep aquifer is restored, the water flow channel in the deep aquifer is continuously stable, and the long-term dynamic balance of the regional water level is maintained.

[0036] like Figure 1 and Figure 2 As shown, in the present invention, the pumping and irrigation equipment includes an irrigation storage tank 2, a pumping storage tank 3, an irrigation pump 21 for irrigation, a pumping pump 31 for pumping, and an irrigation and drainage pipe 4 extending into the water filtering section 11 of each deep well 1. The water inlet of the irrigation pump 21 is connected to the irrigation storage tank 2, and the water outlet of the irrigation pump 21 is connected in parallel with a plurality of irrigation branches provided with irrigation valves, and the outlets of the plurality of irrigation branches are respectively connected to the irrigation and drainage pipe 4 in each deep well 1, for example, the first irrigation branch pipe 22 is connected to the irrigation and drainage pipe 4 in the left deep well 1, and the first irrigation valve 24 is arranged on the first irrigation branch pipe 22, and the second irrigation branch pipe 23 is connected to the irrigation and drainage pipe 4 in the right deep well 1, and the second irrigation valve 25 is arranged on the second irrigation branch pipe 23. The water outlet of the water pump 31 is connected to the water pumping storage tank 3, and the water inlet of the water pump 31 is connected in parallel with multiple water pumping branches equipped with water pumping valves. The water inlets of the multiple water pumping branches are respectively connected to the pumping water pipe 4 in each deep well 1. For example, the first water pumping branch 32 is connected to the pumping water pipe 4 in the right deep well 1, and the first water pumping valve 34 is arranged on the first water pumping branch 32. The second water pumping branch 33 is connected to the pumping water pipe 4 in the left deep well 1, and the second water pumping branch 33 is arranged on the second water pumping valve 35.

[0037] Specifically, Figure 1As shown, when two deep wells 1 are set, the deep well 1 on the left is a recharging well, and the deep well 1 on the right is a pumping well, the irrigation pump 21 and the pumping pump 31 work, the first irrigation valve 24 and the first pumping valve 34 are opened, and the second irrigation valve 25 and the second pumping valve 35 are closed. The irrigation pump 21 pressurizes the recharging water in the irrigation storage tank 2, and transports it to the water filtering section 11 of the left deep well 1 through the first irrigation branch pipe 22 and the pumping water pipe 4 connected thereto; the pumping pump 31 pumps a small amount of water from the water filtering section 11 of the right deep well 1 into the pumping water storage tank 3 through the first pumping branch pipe 32 and the pumping water pipe 4 connected thereto, for users to use (specifically, it can be used for water source heat pump units or other life uses).

[0038] Similarly, if Figure 2 As shown, when silt removal is required after a period of time, the recharging well and the pumping well are interchanged, and the deep well 1 on the right is the recharging well, and the deep well 1 on the left is the pumping well, the irrigation pump 21 and the pumping pump 31 work, the second irrigation valve 25 and the second pumping valve 35 are opened, and the first irrigation valve 24 and the first pumping valve 34 are closed. The irrigation pump 21 pressurizes the recharging water in the irrigation storage tank 2, and transports it to the filtration section 11 of the right deep well 1 through the second irrigation branch pipe 23 and the pumping water pipe 4 connected thereto; the pumping pump 31 pumps a small amount of water from the filtration section 11 of the left deep well 1 into the pumping water storage tank 3 through the second pumping branch pipe 33 and the pumping water pipe 4 connected thereto for storage for users.

[0039] The above description is based on the example of setting two deep wells 1. According to the actual situation, more deep wells can be set, such as setting three or more deep wells 1. Preferably, three or more deep wells 1 are located at the vertices of the polygon, such as Figure 3-Figure 5 As shown, three deep wells 1 are provided, and the three deep wells 1 are located at three vertices of a triangle. Similarly, when four deep wells 1 are provided, the four deep wells 1 are located at four vertices of a quadrilateral.

[0040] like Figure 3 As shown, when three deep wells 1 are set, for example, the deep well 1 at the middle vertex of the triangle is a pumping well, and the remaining two deep wells 1 are recharging wells, ensuring that the amount of recharging water is greater than the amount of pumping water. The irrigation pump 21 and the pumping pump 31 work, the irrigation pump 21 pressurizes the recharging water in the irrigation storage tank 2, and the pumping water pipe 4 transports the water to the filter section 11 of the recharging well, and the pumping pump 31 pumps a small amount of water from the filter section 11 of the pumping well through the pumping water pipe 4 to the pumping storage tank 3 for storage. When dredging is required after a period of time, the irrigation well and the pumping well are interchanged to circulate and convert the flow state and direction of groundwater, discharge silt, and after dredging, the deep well 1 at the vertex of the triangle is restored to be a pumping well, and the remaining two deep wells 1 are recharging wells, and the groundwater recharging work continues to ensure that the amount of recharging water is greater than the amount of pumping water.

[0041] It should be noted that the aforementioned recharging by using the water pump 21 is pressure recharging, and vacuum recharging can also be used. This is a prior art and will not be described in detail here. The present invention can use raw water recharging and surface water recharging. When raw water recharging is used, circulating water is used, and specifically, drainage from construction and drainage from water source heat pump units can be used; when surface water recharging is used, the surface water is simply treated and then recharged into groundwater to increase the regional groundwater level and increase groundwater reserves. Preferably, recharging is performed during the flood season and extraction is performed during the dry season.

[0042] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A deep well synchronous circulation stable pumping and filling method, characterized in that: The steps include: S1. Construction of multiple deep wells: Construction of multiple deep wells extending into the deep aquifer along the ground. The section of the deep well located in the deep aquifer is the water filtering section, and the other sections of the deep well are non-water filtering sections. The water filtering sections of different deep wells are consistent in height position; S2, selecting some deep wells as recharging wells and some deep wells as pumping wells, wherein the recharging wells are located within the influence range of water pressure drop when the pumping wells are pumping water; S3. Install pumping and irrigation equipment: Install pumping and irrigation equipment on the ground that can pump and irrigate water; S4. Simultaneous pumping and injection: The reinjection water is injected into the water filtering section of the reinjection well through the pumping and injection equipment, and the water in the water filtering section of the pumping well is pumped out through the pumping and injection equipment at the same time. The water is injected and pumped back and forth to form a positive cycle in the deep aquifer.

2. The deep well synchronous circulation stable pumping and irrigation method according to claim 1 is characterized in that: It also has the following steps: S5. After a certain period of time, some or all of the pumping wells / recharge wells are replaced with recharge wells / pumping wells; At intervals, steps S4 and S5 are repeated, and water flows back and forth in the deep aquifer, thereby maintaining a stable circulation of water in the deep aquifer.

3. The deep well synchronous circulation stable pumping and irrigation method according to claim 2 is characterized in that: The pumping and irrigation equipment includes an irrigation water storage tank, a pumping water storage tank, an irrigation water pump for irrigation, a pumping water pump for pumping water, and an irrigation and pumping water pipe extending into the water filtering section of each deep well; The water inlet of the irrigation pump is connected to the irrigation storage tank, and the water outlet of the irrigation pump is connected in parallel to a plurality of irrigation branch pipes provided with irrigation valves, and the water outlets of the plurality of irrigation branch pipes are respectively connected to the irrigation water pumping pipes in each deep well; The water outlet of the water pump is connected to the water storage tank, and the water inlet of the water pump is connected in parallel to multiple water branch pipes with water pumping valves. The water inlets of the multiple water branch pipes are respectively connected to the pumping and irrigation pipes in each deep well.

4. The deep well synchronous circulation stable pumping and irrigation method according to any one of claims 1 to 3, characterized in that: The water in the water filtering section of the pumping well pumped out by the pumping and irrigation equipment is used by the water source heat pump unit.

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