CN114320263A - Multi-filter-layer circulating well system and working mode - Google Patents

Abstract

A multi-filter-layer circulating well system and a working mode thereof comprise a circulating well main well, a layered water pumping device, a ground manifold and a valve, wherein the circulating well main well is of a multilayer structure and comprises a drilling hole, a confining and filling layer, a well pipe and water-bearing layer injection pipes, the confining and filling layer is positioned in an annular gap between the drilling hole and the well pipe, the well pipe comprises a settling pipe, a well wall pipe and a water filter pipe, the water filter pipe is connected above the settling pipe and is connected with the well wall pipe at intervals, the water filter pipe corresponds to a gravel water-bearing layer, and the well wall pipe corresponds to a water stop layer; a plurality of injection pipes are arranged in the annular gap between the well pipe and the borehole, the tail ends of the injection pipes correspond to a gravel water-bearing layer, branch valves are arranged at the upper ends of the injection pipes, each injection pipe is connected with a ground manifold, and a main valve is arranged on an annular pipeline of the ground manifold between the adjacent injection pipes; the layered water pumping device is inserted into the hole cavity of the well pipe and comprises a plurality of groups of packers, submersible pumps and water pumping pipes, wherein the packers are connected with the water pumping pipes, the submersible pumps are connected to the tail ends of the water pumping pipes, the packers are arranged at the positions of the well pipe, and the submersible pumps are located at the positions of the water pumping pipes.

Description

Multi-filter-layer circulating well system and working mode

Technical Field

The invention belongs to the field of in-situ remediation of pollution of underground water fields, and particularly relates to a multi-filter-layer circulating well system and a working mode.

Background

The ground water Circulation Well technology (GCW) is an advanced in-situ remediation technology, underground water Circulation is generated through pumping and returning water, and dissolved phase pollutants in underground water can be efficiently removed by combining the technologies of air stripping, air injection, vapor extraction, enhanced biological remediation, chemical oxidation and the like, so that the diffusion of the pollutants is effectively controlled, the pollution plume is prevented from being further expanded, and the method has the remarkable advantages of low remediation cost, small environmental disturbance, low energy consumption and the like.

The in-situ repair technology of foreign groundwater circulation wells starts in the last 90 th century, developed countries such as the United states, Germany and the like have higher research level, and the groundwater circulation well technology is applied to more than 50 polluted areas. At present, no successful circulating well repairing technology application case exists in China, related research is basically in an indoor experiment and numerical simulation stage, core technology and equipment with independent intellectual property rights are lacked, engineering application experience is deficient, and technology research and development capacity and equipment localization level are in urgent need to be improved.

As an advanced in-situ remediation technology, the underground water circulating well technology is rarely applied in China, and the main limiting factors are as follows: (1) the distribution of field pollutants is changed along with the restoration of field pollution, the groundwater three-dimensional circulation is required to be adjusted to cover a relatively heavy pollution area, the groundwater three-dimensional circulation mode of the traditional circulation well is fixed, the horizontal three-dimensional circulation can be influenced only by adjusting the flow, the vertical layered circulation of multiple aquifers can not be realized according to different pollution degrees of the aquifers, and the later treatment efficiency is low; (2) the circulating well is shallow in application depth, the main application depth is 20-30m, and the circulating well is difficult to apply to large-depth aquifer pollution remediation; (3) the problems of various types, various reasons and different degrees of well body blockage can be caused under the influence of various factors such as well forming technology, stratum disturbance, underground water chemical characteristics and the like, so that the radius of the underground water circulation influence is gradually reduced, and the in-situ organic pollution remediation effect of the underground water circulation well is poor.

Disclosure of Invention

The invention aims to provide a multi-filter-layer circulating well system and a working mode, which can form extremely strong hydrodynamic circulation in a target aquifer and effectively expand a target aquifer hydrodynamic regulation area.

In order to solve the technical problems, the invention adopts the following technical scheme:

a multiple filter bed circulating well system, comprising: a main well of the circulating well, a layered water pumping device, a ground manifold and a plurality of valves,

the circulating well main well is of a multilayer structure and comprises a drilling hole, a confining and filling layer, a well pipe and water-bearing layer injection pipes, wherein the confining and filling layer is positioned in an annular gap between the drilling hole and the well pipe, the well pipe comprises a settling pipe, a well wall pipe and a water filter pipe, the settling pipe is positioned at the bottom of the drilling hole, the water filter pipe is connected above the settling pipe, the water filter pipe is connected with the well wall pipe at intervals, the top of the settling pipe is the well wall pipe, the confining and filling layer realizes layering through layered gravel filling and layered water stopping, the water filter pipe corresponds to a gravel water-bearing layer, and the well wall pipe corresponds to a water-stopping layer; a plurality of injection pipes are put into an annular gap between a well pipe and a borehole, the tail ends of the injection pipes correspond to a gravel water-bearing stratum, branch valves are arranged at the upper ends of the injection pipes, each injection pipe is connected with a ground manifold, the ground manifold comprises annular pipelines, and a main valve is arranged on the annular pipeline between the adjacent injection pipes;

the pore space that layering pumping device inserted the well casing includes multiunit packer, immersible pump and drinking-water pipe, and this packer and drinking-water union coupling, this immersible pump are connected at the end of drinking-water pipe, and what the packer corresponds installs the casing pipe position in the well casing, and the immersible pump is located the strainer position.

The circulation well main well is of a six-layer structure, adopts a successive pipe descending mode, and has the following operation method: firstly, according to a well body design structure, a well pipe is put into a borehole, the well pipe comprises a settling pipe, six water filter pipes and six well wall pipes, and after the well pipe is put into a preset position, the top well wall pipe is fixed on a well mouth; secondly, a bottom aquifer injection pipe is lowered into the annular gap between the well pipe and the borehole, and the bottom aquifer injection pipe is fixed on a wellhead after being lowered to a preset position; filling gravel around the well pipe and the injection pipe of the bottom aquifer until the gravel material backfilling height reaches the lower part of a water stop section between the fifth aquifer and the bottom aquifer, then filling clay balls around the gravel material to stop water until the water stop section is completely filled, and completely sealing the fifth aquifer from the bottom aquifer; continuing to put a fifth aquifer injection pipe into the annular gap between the well pipe and the borehole, and fixing the fifth aquifer injection pipe on the wellhead after putting the fifth aquifer injection pipe to a preset position; filling gravel around the well pipe, the bottom aquifer injection pipe and the fifth aquifer injection pipe until the gravel backfilling height reaches the lower part of a water stop section between the fourth aquifer and the fifth aquifer, filling clay balls around the gravel backfilling height to stop water until the water stop section is completely filled, and completely sealing the fourth aquifer and the fifth aquifer; sixthly, according to the operation, the fourth aquifer injection pipe, the third aquifer injection pipe, the second aquifer injection pipe and the top aquifer injection pipe are put into the well, and layered gravel filling and layered water stopping are carried out on the pipes until the annular gap between the top aquifer and the ground surface is completely backfilled by clay materials, and the construction of the main well of the circulating well is completed; the first aquifer injection pipe is connected with a main manifold through a first valve, the second aquifer injection pipe is connected with the main manifold through a second valve, the third aquifer injection pipe is connected with the main manifold through a third valve, the fourth aquifer injection pipe is connected with the main manifold through a tenth valve, the fifth aquifer injection pipe is connected with the main manifold through an eleventh valve, and the sixth aquifer injection pipe is connected with the main manifold through a twelfth valve.

The water pumping device comprises a top water pumping device, a second layer water pumping device, a third layer water pumping device, a fourth layer water pumping device, a fifth layer water pumping device and a bottom water pumping device, wherein the top water pumping device is mainly used for pumping water for the first aquifer and is connected to a main manifold through a submersible pump and a water pumping pipe through a fourth valve; the second-layer water pumping device is mainly used for pumping water for a second aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a top packer and a fifth valve; the third layer of water pumping device is mainly used for pumping water for a third aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a second layer of packer, a top packer and a sixth valve; the fourth layer of water pumping device is mainly used for pumping water for a fourth aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a third layer of packer, a second layer of packer, a top packer and a seventh valve; the fifth layer water pumping device is mainly used for pumping water for a fifth aquifer and is connected to a main manifold through a submersible pump through a water pumping pipe, a fourth layer packer, a third layer packer, a second layer packer, a top packer and an eighth valve; the bottom pumping device mainly pumps water for a bottom aquifer and is connected to a main manifold through a submersible pump through a pumping pipe, a bottom packer, a fourth packer, a third packer, a second packer, a top packer and a ninth valve.

The top packer, the second layer packer, the third layer packer, the fourth layer packer and the bottom packer all comprise upper joints, rubber cylinders, sliding ends and a central pipe, the upper joints, the sliding ends and the central pipe are all made of stainless steel materials, and the rubber cylinders are made of nitrile rubber; the upper joint is connected with the central pipe and the rubber barrel through inner and outer screw threads, the central pipe and the rubber barrel form a sealing ring cavity, the sliding end penetrates through the central pipe and is connected with the rubber barrel through the screw threads and slides along the central pipe along with the unsealing and shrinking of the packer, and the sliding end and the central pipe are sealed through two sealing rubber rings; the central pipe is provided with a liquid inlet for feeding liquid into the packer rubber barrel; the position of the packer corresponds to the water stop positions of all layers of the main well of the circulating well; the central pipes of the packers are connected in series through drill pipes, the seal opening media adopted by the top packer, the second layer packer, the third layer packer, the fourth layer packer and the bottom packer are liquid, high-pressure liquid is injected into the central pipes through a ground high-pressure pump, and the high-pressure liquid enters the rubber barrel through a liquid inlet of the central pipes, so that the rubber barrel of the packer is expanded under the action of pressure to complete seat sealing; after the operation is finished, releasing the pressure in the central pipe and the rubber sleeve through a ground pressure control system, withdrawing the packer after the release is finished, and lifting the packer out of the well; and a sealing joint is arranged at the bottom of the central pipe of the bottom packer.

The top packer is provided with a second layer of water pumping channel, a third layer of water pumping channel, a fourth layer of water pumping channel, a fifth layer of water pumping channel and a bottom water pumping channel, each water pumping channel adopts a high-pressure rubber pipe and is arranged in an annular space between a packer rubber cylinder and a central pipe, two ends of the channel are sealed through sealing joints, and the sealing joints can be connected with the water pumping pipes through screw threads; compared with the top packer, the second layer packer reduces a second layer pumping channel and a water pump cable thereof, the third layer packer reduces a second layer, a third layer pumping channel and a water pump cable thereof, the fourth layer packer reduces a second layer, a third layer, a fourth layer pumping channel and a water pump cable thereof, and the bottom packer only reserves a bottom pumping channel and a water pump cable thereof.

The layered water pumping device adopts a binding pipe descending method, and the operation method comprises the following steps: according to the pipe arrangement position in the pipe, the bottom water pumping device is downwards arranged in the well pipe through a water outlet pipe of the bottom water pumping device; after the water pumping pipe is lowered to the mounting position of the bottom packer, the water pumping pipe of the bottom water pumping device is connected with the lower end of a water pumping channel of the bottom packer, the upper end of the water pumping channel of the bottom packer is continuously connected with the water pumping pipe, the upper end of a central pipe of the bottom packer is connected with a drill rod, the water pumping pipe and the drill rod which are connected with the upper end of the bottom packer are bound and fixed through an iron wire or a binding tape, and the whole body of the drill rod is lowered into a well pipe; when the bottom packer is lowered to reach the design distance with the fifth layer water pumping device, the fifth layer water pumping device is lowered into the well pipe through the water pumping pipe, and is bound and fixed with the water pumping pipe and the drill pipe at the upper end of the bottom layer water pumping device through an iron wire or a binding belt, and is further lowered into the well pipe; when the fifth layer of water pumping device is put in to reach the design distance of a fourth layer of packer, the water pumping pipes of the bottom water pumping device and the fifth layer of water pumping device are respectively connected with the lower end of a water pumping channel of the fourth layer of packer, the lower end of a central pipe of the fourth layer of packer is connected with a drill rod at the upper end of the bottom packer, the upper end of the water pumping channel of the fourth layer of packer is respectively continuously connected with the bottom water pumping pipe and the water pumping pipe of the fifth layer of water pumping device, and the water pumping pipes and a connecting drill rod at the upper end of the fourth layer of packer are bound and fixed through iron wires or ribbons and are continuously put into a well pipe; repeating the operation method, and continuing to put a fourth layer of water pumping device, a third layer of packer, a third layer of water pumping device, a second layer of packer, a second layer of water pumping device, a top packer and a top water pumping device into the well pipe until all drilling tools are put into the well pipe; and installing the layered water pumping device on a wellhead through a wellhead tray.

The working mode of the multi-filter-layer circulating well system is characterized in that: comprises a first pumping and first injecting cycle mode, wherein the first pumping and first injecting cycle mode comprises an upper pumping and lower injecting cycle mode or a lower pumping and upper injecting cycle mode;

the draw-up bet cycle mode: taking the top aquifer and the second aquifer as examples, pumping water to the top aquifer and injecting water to the second aquifer; firstly, opening a fourth branch valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer submersible pump is opened to pump water, and the water is injected into a second aquifer through a second layer injection pipe through a fourth valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, the water level of the top aquifer can descend along with the pumping and injection of the water, and the water level of the second aquifer can ascend to form a water level difference; under the action of the water head difference, the second aquifer supplies the top aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the groundwater circulation is not limited to the periphery of the well hole, but diffuses to the far end, and forms a groundwater circulation mode of pumping up and pouring down.

The lower pumping and upper injecting circulation mode is as follows: taking the top aquifer and the second aquifer as examples, pumping water to the second aquifer and injecting water to the top aquifer; firstly, opening a fifth branch valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve, a twenty-third main valve and a first branch valve, and closing other valves; opening the second layer of submersible pump to pump water, and injecting the water into the top aquifer through the top aquifer injection pipe through the fifth valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve, the twenty-third main valve and the first branch valve, wherein the water level of the top aquifer can rise and the water level of the second aquifer can fall to form a water level difference along with the pumping and injecting of the water; under the action of the water head difference, the top aquifer supplies the second aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the underground water circulation is not limited to the periphery of the well hole, but diffuses towards the far end to form an underground water circulation mode of pumping down and injecting up.

The working modes of the multi-filter-layer circulating well system comprise a multi-pumping and one-injection circulating mode: the multi-pumping-injection circulation mode mainly aims at aquifers with poor pollution remediation effects, aquifers with poor water-rich properties or aquifers with weak hydrodynamic circulation of a circulation well, and the mode is that water of other aquifers is pumped to a target aquifer in a concentrated mode, so that the target aquifer and other aquifers form a large water head, and a strong hydrodynamic force is formed in the target aquifer, thereby enlarging a target aquifer hydrodynamic force regulation and control area, mainly solving the problem of pollution of the target aquifer and improving the overall pollution remediation efficiency of the circulation well; the multi-pumping and one-pouring cycle mode can be expanded into a five-pumping and one-pouring cycle mode at most;

taking a two-pumping and one-injecting circulation mode developed by the top aquifer, the second aquifer and the third aquifer as an example, the second aquifer has poor repairing effect, and the top aquifer and the third aquifer are pumped and injected with water. Firstly, opening a fourth branch valve, a sixth branch valve, a nineteenth main valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer and the third aquifer are submerged pumps are opened to pump water, and the water is injected into the second aquifer through the fourth valve, the sixth valve, the nineteenth main valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve and the second branch valve through the second layer injection pipe, along with the pumping and the injection of the water, the water levels of the top aquifer and the third aquifer can fall, the water level of the second aquifer can rise, and a larger water level difference is formed; under the action of the water head, the second aquifer supplies the top aquifer and the third aquifer. Because the packer completely separates the top aquifer, the second aquifer and the third aquifer, the second aquifer circulates faster and the radius of circulation influence is larger under the driving of stronger water power.

The working modes of the multi-filter-layer circulating well system comprise a multi-pumping multi-injection circulating mode, are mainly used for realizing refined circulating remediation of site polluted areas, can simultaneously carry out independent pollution circulating remediation on a plurality of aquifers, and design an independent circulating mode for each aquifer remediation;

taking the three-pumping and three-injecting mode as an example, the top aquifer, the third aquifer and the fifth aquifer are pumped, and water is injected into the second aquifer, the fourth aquifer and the bottom aquifer respectively. Firstly, opening a fifth valve, a twentieth valve and a fourth valve, closing other valves, opening a top aquifer submersible pump to pump water, injecting a second aquifer through the fourth valve, the twentieth valve and the fifth valve, descending the water level of the top aquifer along with the pumping and injecting of water, ascending the water level of the second aquifer to form a water level difference, and opening the hydraulic circulation of the top aquifer and the second aquifer; then, opening a sixth valve, an eighteenth main valve and a seventh valve, closing other valves, opening a third aquifer submersible pump to pump water, injecting a fourth aquifer through the sixth valve, the eighteenth main valve and the seventh valve, descending the water level of the third aquifer and ascending the water level of the fourth aquifer along with the pumping and injecting of water, forming a water level difference, and opening the hydraulic circulation of the third aquifer and the fourth aquifer; and finally, opening the eighth valve 8, the sixteenth main valve and the ninth valve, closing other valves, opening the fifth aquifer submersible pump to pump water, injecting the water into the bottom aquifer through the eighth valve, the sixteenth main valve and the ninth valve, descending the water level of the fifth aquifer along with the pumping and injecting of the water, ascending the water level of the bottom aquifer to form a water level difference, and opening the hydraulic circulation of the fifth aquifer and the bottom aquifer. Therefore, relatively independent circulation modes are opened for the six aquifers, the circulation modes can be matched with different repairing appliances, processes and methods for circular repairing from bottom to top, and meanwhile, from the aspect of the overall circulation mode, the circulation well also opens a bottom-to-top progressive hydraulic circulation mode.

The invention has the beneficial effects that:

1) the novel multi-filter-layer circulating well system can provide various underground water circulating modes, and can greatly improve the pollutant removal efficiency and shorten the repairing and purifying period of the circulating well by matching with medicament injection equipment, aeration equipment, a bioreactor and the like;

2) the multi-filter-layer circulating well system can provide a multi-pumping-injection circulating mode, and water of other multiple aquifers is intensively pumped to a target aquifer, so that the target aquifer and the other aquifers form a larger water head, and a strong hydrodynamic circulation is formed in the target aquifer, so that a hydrodynamic regulation and control area of the target aquifer is effectively expanded, and the pollution remediation problem of the aquifer with a poor remediation effect, a water-rich aquifer or a water-bearing layer with a weak hydrodynamic circulation is mainly solved;

3) the multi-filter-layer circulating well system can provide a multi-pumping multi-injection circulating mode, can simultaneously carry out independent pollution circulating repair on a plurality of aquifers, designs an independent circulating mode for repairing each aquifer, realizes accurate target repair of each aquifer and greatly improves the pollution repairing efficiency of the circulating well;

4) the multi-filter-layer circulating well system can provide a well body blockage removal mode, solve the problem of blockage in the running process of the circulating well and ensure the normal running of the circulating well;

5) the multi-filter-layer circulating well system provided by the invention has the advantages that the core component of the multi-filter-layer circulating well system is a multifunctional packer which can effectively seal and separate in a pipe and can be repeatedly used, and the pumping channels of all aquifers are designed, so that the circulating well can complete the circulation of a plurality of aquifers at the same time, the repairing time is saved, and the repairing efficiency is improved;

6) the novel multi-filter-layer circulating well system can effectively improve the application depth of the circulating well, and can expand the application depth to 100 m;

7) the novel multi-filter-layer circulating well system has the function of replacing multiple wells with one well, and can effectively save the floor area of drilling holes and the construction cost.

Drawings

In order to more clearly explain the embodiments of the present invention, the embodiments will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of the top packer construction.

FIG. 3 is a schematic diagram of a second zone packer construction.

FIG. 4 is a schematic top view of a top packer.

FIG. 5 is a schematic diagram of a top view of a second zone packer.

FIG. 6 is a schematic diagram of a top view of a third layer packer.

FIG. 7 is a schematic diagram of a top view of a fourth packer.

FIG. 8 is a schematic top view of a bottom packer.

Detailed Description

As shown in fig. 1 to 8, a multi-filter circulation well system of the present invention includes: a main well of the circulating well, a layered water pumping device, a ground manifold and a plurality of valves,

the circulating well main well is of a multilayer structure and comprises a drilling hole, a confining filling layer, a well pipe and injection pipes of all water-bearing layers, wherein the confining filling layer is positioned in an annular gap between the drilling hole and the well pipe, the well pipe comprises a settling pipe 21, a casing pipe 22 and a water filter pipe 23, the settling pipe 21 is positioned at the bottom of the drilling hole, the water filter pipe 23 is connected above the settling pipe 21, the water filter pipe 23 is connected with the casing pipe 22 at intervals, the casing pipe is arranged at the top of the settling pipe, the confining filling layer realizes layering through layered gravel filling and layered water stopping, the water filter pipe 23 corresponds to a gravel water-bearing layer 23A, and the casing pipe 22 corresponds to a water-stopping layer 22A; a plurality of injection pipes are put into an annular gap between a well pipe and a borehole, the tail ends of the injection pipes correspond to a gravel water-bearing stratum, branch valves are arranged at the upper ends of the injection pipes, each injection pipe is connected with a ground manifold, the ground manifold comprises annular pipelines, and a main valve is arranged on the annular pipeline between the adjacent injection pipes;

the pore space that layering pumping device inserted the well casing includes multiunit packer, immersible pump and drinking-water pipe, and this packer and drinking-water union coupling, this immersible pump are connected at the end of drinking-water pipe, and what the packer corresponds installs the casing pipe position in the well casing, and the immersible pump is located the strainer position.

Preferably, the main well of the circulation well is of a six-layer structure, the main well of the circulation well adopts a successive pipe descending mode, and the operation method comprises the following steps: firstly, according to a well body design structure, a well pipe is put into a borehole, the well pipe comprises a settling pipe, six water filter pipes and six well wall pipes, and after the well pipe is put into a preset position, the top well wall pipe is fixed on a well mouth; secondly, a bottom aquifer injection pipe 31 is lowered into the annular gap between the well pipe and the borehole, and the bottom aquifer injection pipe 31 is fixed on a wellhead after the bottom aquifer injection pipe is lowered to a preset position; filling gravel around the well pipe and the injection pipe of the bottom aquifer until the gravel material backfilling height reaches the lower part of a water stop section between the fifth aquifer and the bottom aquifer, then filling clay balls around the gravel material to stop water until the water stop section is completely filled, and completely sealing the fifth aquifer from the bottom aquifer; continuing to put the fifth aquifer injection pipe 32 into the annular gap between the well pipe and the borehole, and fixing the fifth aquifer injection pipe 32 on the wellhead after putting the fifth aquifer injection pipe to a preset position; filling gravel around the well pipe, the bottom aquifer injection pipe 31 and the fifth aquifer injection pipe 32 until the gravel material backfilling height reaches the lower part of a water stop section between the fourth aquifer and the fifth aquifer, then filling clay balls around the gravel material to stop water until the water stop section is completely filled, and completely sealing the fourth aquifer and the fifth aquifer; sixthly, according to the operation, the fourth aquifer injection pipe 33, the third aquifer injection pipe 34, the second aquifer injection pipe 35 and the top aquifer injection pipe 36 are put into the well, and layered gravel filling and layered water stopping are carried out on the pipes until the annular gap between the top aquifer and the ground surface is completely backfilled by clay materials, and the construction of the main well of the circulating well is completed; the top aquifer injection pipe is connected with the main manifold 10 through the first valve 1, the second aquifer injection pipe 35 is connected with the main manifold 10 through the second valve 2, the third aquifer injection pipe 34 is connected with the main manifold 10 through the third valve 3, the fourth aquifer injection pipe 33 is connected with the main manifold 10 through the tenth valve 10, the fifth aquifer injection pipe 32 is connected with the main manifold through the tenth valve 11, and the bottom aquifer injection pipe 31 is connected with the main manifold through the twelfth valve 12.

The water pumping devices comprise a top water pumping device, a second layer water pumping device, a third layer water pumping device, a fourth layer water pumping device, a fifth layer water pumping device and a bottom water pumping device, wherein the top water pumping device mainly pumps water for a first aquifer and is connected to a main manifold through a first submersible pump 41 and a first water pumping pipe 42 through a fourth valve 4; the second-layer water pumping device is mainly used for pumping water for a second aquifer and is connected to a main manifold through a second submersible pump 51 through a second water pumping pipe 52, a top packer 53 and a fifth valve 5; the third layer of water pumping device is mainly used for pumping water for a third aquifer and is connected to a main manifold through a third submersible pump 61 through a third water pumping pipe 62, a second layer of packer 63, a top packer 53 and a sixth valve 6; the fourth layer water pumping device is mainly used for pumping water for a fourth aquifer and is connected to the main manifold through a fourth submersible pump 71 through a water pumping pipe 72, a third layer packer 73, a second layer packer 63, a top packer 53 and a seventh valve 7; the fifth layer water pumping device is mainly used for pumping water for a fifth aquifer and is connected to a main manifold through a fifth submersible pump 81 through a water pumping pipe 82, a fourth layer packer 83, a third layer packer 73, a second layer packer 63, a top packer 53 and an eighth valve 8; the bottom pumping device mainly pumps water for a bottom aquifer and is connected to a main manifold through a sixth submersible pump 91 through a sixth pumping pipe 92, a bottom packer 93, a fourth packer 83, a third packer 73, a second packer 63, a top packer 53 and a ninth valve 9.

The specification of the well pipe of the main well of the circulating well is determined according to the parameters of pollution remediation equipment or pumping equipment in the well, the well pipe is generally designed to be 400-800mm, and a stainless steel pipe, a low-carbon steel pipe or a PE (polyethylene) pipe can be adopted; the settling pipe is positioned at the bottom of the drill hole, the length of the settling pipe can be designed to be 1.0-3.0m, the water filtering pipes respectively correspond to the aquifers, and the well wall pipes respectively correspond to the clay water stopping positions.

The injection pipes of each layer are determined according to the flow of water injection, are generally PVC-U casing pipes which are connected through screw threads and sealed by O-shaped rings, have the specification of 30-75mm, are arranged in an annular space between the casing pipe and a drill hole, have the bottoms corresponding to the moving water levels of the aquifers, and have the tops connected to a manifold through a ground manifold and a valve.

As shown in fig. 2, each of the top packer, the second packer, the third packer, the fourth packer and the bottom packer comprises an upper joint 30, a rubber sleeve 40, a sliding end 50 and a central pipe 60, the upper joint 30, the sliding end 50 and the central pipe 60 are all made of stainless steel, and the rubber sleeve 40 is made of nitrile rubber; the upper joint 30 is connected with the central pipe and the rubber sleeve through inner and outer screw threads, the central pipe and the rubber sleeve form a sealing ring cavity, the sliding end penetrates through the central pipe and is connected with the rubber sleeve through the screw threads, the sliding end slides along the central pipe along with the unsealing and shrinking of the packer, and the sliding end and the central pipe are sealed through two sealing rubber rings; a liquid inlet 60A is arranged on the central pipe and used for feeding liquid into a packer rubber barrel; the position of the packer corresponds to the water stop positions of all layers of the main well of the circulating well; the central pipes of the packers are connected in series through drill pipes, the seal opening media adopted by the top packer, the second layer packer, the third layer packer, the fourth layer packer and the bottom packer are liquid, high-pressure liquid is injected into the central pipes through a ground high-pressure pump, and the high-pressure liquid enters the rubber barrel through a liquid inlet of the central pipes, so that the rubber barrel of the packer is expanded under the action of pressure to complete seat sealing; after the operation is finished, the pressure in the central pipe and the rubber sleeve is released through a ground pressure control system, and after the release is finished, the packer is retracted to lift the layered water pumping device in the well.

The top packer is provided with a second layer of water pumping channel 52A for a second water pumping pipe to penetrate through, a third layer of water pumping channel 62A for a third water pumping pipe to penetrate through, a fourth layer of water pumping channel 72A for a fourth water pumping pipe to penetrate through, a fifth layer of water pumping channel 82A for a fifth water pumping pipe to penetrate through, and a bottom water pumping channel 92A for a sixth water pumping pipe to penetrate through, each water pumping channel adopts a high-pressure rubber pipe and is arranged in an annular space gap between a packer rubber cylinder and a central pipe, two ends of the channel are sealed through sealing joints, and the sealing joints can be connected with the water pumping pipes through screw threads; compared with the top packer, the second layer packer reduces a second layer pumping channel and a water pump cable thereof, the third layer packer reduces a second layer, a third layer pumping channel and a water pump cable thereof, the fourth layer packer reduces a second layer, a third layer, a fourth layer pumping channel and a water pump cable thereof, and the bottom packer only reserves a bottom pumping channel and a water pump cable thereof.

The layered water pumping device adopts a binding pipe descending method, and the operation method comprises the following steps: according to the pipe arrangement position in the pipe, the bottom water pumping device is downwards arranged in the well pipe through a water outlet pipe of the bottom water pumping device; after the water pumping pipe is lowered to the mounting position of the bottom packer, the water pumping pipe of the bottom water pumping device is connected with the lower end of a water pumping channel of the bottom packer, the upper end of the water pumping channel of the bottom packer is continuously connected with the water pumping pipe, the upper end of a central pipe of the bottom packer is connected with a drill rod, the water pumping pipe and the drill rod which are connected with the upper end of the bottom packer are bound and fixed through an iron wire or a binding tape, and the whole body of the drill rod is lowered into a well pipe; when the bottom packer is lowered to reach the design distance with the fifth layer water pumping device, the fifth layer water pumping device is lowered into the well pipe through the water pumping pipe, and is bound and fixed with the water pumping pipe and the drill pipe at the upper end of the bottom layer water pumping device through an iron wire or a binding belt, and is further lowered into the well pipe; when the fifth layer of water pumping device is put in to reach the design distance of a fourth layer of packer, the water pumping pipes of the bottom water pumping device and the fifth layer of water pumping device are respectively connected with the lower end of a water pumping channel of the fourth layer of packer, the lower end of a central pipe of the fourth layer of packer is connected with a drill rod at the upper end of the bottom packer, the upper end of the water pumping channel of the fourth layer of packer is respectively continuously connected with the bottom water pumping pipe and the water pumping pipe of the fifth layer of water pumping device, and the water pumping pipes and a connecting drill rod at the upper end of the fourth layer of packer are bound and fixed through iron wires or ribbons and are continuously put into a well pipe; repeating the operation method, and continuing to put a fourth layer of water pumping device, a third layer of packer, a third layer of water pumping device, a second layer of packer, a second layer of water pumping device, a top packer and a top water pumping device into the well pipe until all drilling tools are put into the well pipe; and installing the layered water pumping device on a wellhead through a wellhead tray.

The working mode of the multi-filter-layer circulating well system;

(1) one pumping and one filling circulation mode

The one-pumping one-injecting circulation mode is the most common underground water circulation mode, generally aiming at two aquifers to circulate, and is divided into an upper pumping and lower injecting circulation mode and a lower pumping and upper injecting circulation mode.

Circulation mode of pumping up and pouring down

Taking the top aquifer and the second aquifer as examples, pumping water to the top aquifer and injecting water to the second aquifer; firstly, opening a fourth branch valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer submersible pump is opened to pump water, and the water is injected into a second aquifer through a second layer injection pipe through a fourth valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, the water level of the top aquifer can descend along with the pumping and injection of the water, and the water level of the second aquifer can ascend to form a water level difference; under the action of the water head difference, the second aquifer supplies the top aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the groundwater circulation is not limited to the periphery of the well hole, but diffuses to the far end, and forms a groundwater circulation mode of pumping up and pouring down.

Second, lower pumping and upper filling circulation mode

Taking the top aquifer and the second aquifer as examples, pumping water to the second aquifer and injecting water to the top aquifer; firstly, opening a fifth branch valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve, a twenty-third main valve and a first branch valve, and closing other valves; opening the second layer of submersible pump to pump water, and injecting the water into the top aquifer through the top aquifer injection pipe through the fifth valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve, the twenty-third main valve and the first branch valve, wherein the water level of the top aquifer can rise and the water level of the second aquifer can fall to form a water level difference along with the pumping and injecting of the water; under the action of the water head difference, the top aquifer supplies the second aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the underground water circulation is not limited to the periphery of the well hole, but diffuses towards the far end to form an underground water circulation mode of pumping down and injecting up.

(2) Multi-pumping and one-injection circulation mode

The multi-pumping and one-injecting circulation mode is mainly used for a aquifer with poor pollution remediation effect, an aquifer with poor water-rich property or an aquifer with weak hydrodynamic circulation of the circulation well, and the mode is that water of other aquifers is pumped to a target aquifer in a centralized manner, so that the target aquifer and other aquifers form a large water head, and a strong hydrodynamic force is formed in the target aquifer, so that a target aquifer hydrodynamic regulation and control area is enlarged, the problem of pollution of the target aquifer is mainly solved, and the overall pollution remediation efficiency of the circulation well is improved; the multi-pumping-one-pouring cycle mode can be expanded to a five-pumping-one-pouring cycle mode at most.

Taking a two-pumping and one-injecting circulation mode developed by the top aquifer, the second aquifer and the third aquifer as an example, the second aquifer has poor repairing effect, and the top aquifer and the third aquifer are pumped and injected with water. Firstly, opening a fourth branch valve, a sixth branch valve, a nineteenth main valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer and the third aquifer are submerged pumps are opened to pump water, and the water is injected into the second aquifer through the fourth valve, the sixth valve, the nineteenth main valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve and the second branch valve through the second layer injection pipe, along with the pumping and the injection of the water, the water levels of the top aquifer and the third aquifer can fall, the water level of the second aquifer can rise, and a larger water level difference is formed; under the action of the water head, the second aquifer supplies the top aquifer and the third aquifer. Because the packer has sealed apart top aquifer, second aquifer and third aquifer completely, consequently, under stronger hydrodynamic drive, the second aquifer circulating speed is faster, and the circulation influence radius is bigger, can effectively promote second aquifer and restore efficiency.

(3) Multi-pumping multi-injection composite circulation mode

The multi-pumping multi-injection circulation mode is mainly used for realizing refined circulation restoration of a site pollution area, can simultaneously carry out independent pollution circulation restoration on a plurality of aquifers, and designs an independent circulation mode for restoration of each aquifer; by matching with different repairing apparatuses, processes and methods, accurate target repairing of each aquifer is realized, and the pollution repairing efficiency of the circulating well is greatly improved.

Taking the three-pumping and three-injecting mode as an example, the top aquifer, the third aquifer and the fifth aquifer are pumped, and water is injected into the second aquifer, the fourth aquifer and the bottom aquifer respectively. Firstly, opening a fifth valve, a twentieth valve and a fourth valve, closing other valves, opening a top aquifer submersible pump to pump water, injecting a second aquifer through the fourth valve, the twentieth valve and the fifth valve, descending the water level of the top aquifer along with the pumping and injecting of water, ascending the water level of the second aquifer to form a water level difference, and opening the hydraulic circulation of the top aquifer and the second aquifer; then, opening a sixth valve, an eighteenth main valve and a seventh valve, closing other valves, opening a third aquifer submersible pump to pump water, injecting a fourth aquifer through the sixth valve, the eighteenth main valve and the seventh valve, descending the water level of the third aquifer and ascending the water level of the fourth aquifer along with the pumping and injecting of water, forming a water level difference, and opening the hydraulic circulation of the third aquifer and the fourth aquifer; and finally, opening the eighth valve 8, the sixteenth main valve and the ninth valve, closing other valves, opening the fifth aquifer submersible pump to pump water, injecting the water into the bottom aquifer through the eighth valve, the sixteenth main valve and the ninth valve, descending the water level of the fifth aquifer along with the pumping and injecting of the water, ascending the water level of the bottom aquifer to form a water level difference, and opening the hydraulic circulation of the fifth aquifer and the bottom aquifer. Therefore, relatively independent circulation modes are opened for the six aquifers, the circulation modes can be matched with different repairing appliances, processes and methods for circular repairing from bottom to top, and meanwhile, from the aspect of the overall circulation mode, the circulation well also opens a bottom-to-top progressive hydraulic circulation mode.

(4) Well block removal mode

In the operation process of the multi-filter-layer circulating well, the multi-filter-layer circulating well is easily influenced by a plurality of factors such as well formation technology, stratum disturbance, underground water chemical characteristics and the like, and the problems of blockage of various types, various reasons and different degrees can be caused, so that the radius of the underground water circulation influence is gradually reduced, and the in-situ organic pollution remediation effect of the underground water circulating well is poor.

Aiming at the problem of the blockage of the well body of the circulating well, the blockage can be removed by using each aquifer injection pipe. The specific blockage removal method comprises the following steps: opening a connecting joint of an aquifer injection pipe and a ground manifold, and downwards putting a small-caliber submersible pump into the injection pipe to pump water so as to pump silts or sediments around a well body to achieve the aim of unblocking; and secondly, opening a connecting joint of the aquifer injection pipe and a ground manifold, descending the aquifer injection pipe into the high-pressure gas pipeline, opening a ground air compressor, injecting high-pressure air into the well through the high-pressure pipeline, and performing air compressor well washing.

The multi-filter-layer circulating well system can realize vertical layered circulation of multiple aquifers according to different pollution degrees of the aquifers, expand the use depth of the circulating well, solve the problem of blockage of a circulating well body, improve the pollutant removal efficiency, shorten the repairing and purifying period of the circulating well and lay a foundation for popularization and application of the underground water circulating well technology in China.

Claims (9)

1. A multiple filter bed circulating well system, comprising: a main well of the circulating well, a layered water pumping device, a ground manifold and a plurality of valves,

the circulating well main well is of a multilayer structure and comprises a drilling hole, a confining and filling layer, a well pipe and water-bearing layer injection pipes, wherein the confining and filling layer is positioned in an annular gap between the drilling hole and the well pipe, the well pipe comprises a settling pipe, a well wall pipe and a water filter pipe, the settling pipe is positioned at the bottom of the drilling hole, the water filter pipe is connected above the settling pipe, the water filter pipe is connected with the well wall pipe at intervals, the top of the settling pipe is the well wall pipe, the confining and filling layer realizes layering through layered gravel filling and layered water stopping, the water filter pipe corresponds to a gravel water-bearing layer, and the well wall pipe corresponds to a water-stopping layer; a plurality of injection pipes are put into an annular gap between a well pipe and a borehole, the tail ends of the injection pipes correspond to a gravel water-bearing stratum, branch valves are arranged at the upper ends of the injection pipes, each injection pipe is connected with a ground manifold, the ground manifold comprises annular pipelines, and a main valve is arranged on the annular pipeline between the adjacent injection pipes;

the pore space that layering pumping device inserted the well casing includes multiunit packer, immersible pump and drinking-water pipe, and this packer and drinking-water union coupling, this immersible pump are connected at the end of drinking-water pipe, and what the packer corresponds installs the casing pipe position in the well casing, and the immersible pump is located the strainer position.

2. The multiple filter bed circulation well system of claim 1, wherein: the circulation well main well is of a six-layer structure, adopts a successive pipe descending mode, and has the following operation method: according to the design structure of a well body, a well pipe is put into a borehole, the well pipe comprises a settling pipe, six water filter pipes and six casing pipes, and after the well pipe is put into a preset position, the top casing pipe is fixed on a well mouth; a bottom aquifer injection pipe is lowered into the annular gap between the well pipe and the borehole, and is fixed at a wellhead after being lowered to a preset position; filling gravel around the well pipe and the injection pipe of the bottom aquifer until the gravel material backfilling height reaches the lower part of a water stop section between the fifth aquifer and the bottom aquifer, then filling a clay ball around the gravel material to stop water until the water stop section is completely filled, and completely sealing the fifth aquifer from the bottom aquifer; continuously descending a fifth aquifer injection pipe into the annular gap between the well pipe and the borehole, and fixing the fifth aquifer injection pipe on a wellhead after descending to a preset position; filling gravel around the well pipe, the bottom aquifer injection pipe and the fifth aquifer injection pipe until the gravel material backfilling height reaches the lower part of a water stop section between the fourth aquifer and the fifth aquifer, then filling clay balls around the gravel material backfilling height to stop water until the water stop section is completely filled, and completely sealing the fourth aquifer and the fifth aquifer; according to the operation, the fourth aquifer injection pipe, the third aquifer injection pipe, the second aquifer injection pipe and the top aquifer injection pipe are put into the well, and are subjected to layered gravel filling and layered water stopping until the annular gap between the top aquifer and the ground surface is completely backfilled by clay materials, so that the main well construction of the circulating well is completed; the first aquifer injection pipe is connected with a main manifold through a first valve, the second aquifer injection pipe is connected with the main manifold through a second valve, the third aquifer injection pipe is connected with the main manifold through a third valve, the fourth aquifer injection pipe is connected with the main manifold through a tenth valve, the fifth aquifer injection pipe is connected with the main manifold through an eleventh valve, and the sixth aquifer injection pipe is connected with the main manifold through a twelfth valve.

3. The multiple filter bed circulation well system of claim 1, wherein: the water pumping device comprises a top water pumping device, a second layer water pumping device, a third layer water pumping device, a fourth layer water pumping device, a fifth layer water pumping device and a bottom water pumping device, wherein the top water pumping device is mainly used for pumping water for the first aquifer and is connected to a main manifold through a submersible pump and a water pumping pipe through a fourth valve; the second-layer water pumping device is mainly used for pumping water for a second aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a top packer and a fifth valve; the third layer of water pumping device is mainly used for pumping water for a third aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a second layer of packer, a top packer and a sixth valve; the fourth layer of water pumping device is mainly used for pumping water for a fourth aquifer and is connected to the main manifold through a submersible pump through a water pumping pipe, a third layer of packer, a second layer of packer, a top packer and a seventh valve; the fifth layer water pumping device is mainly used for pumping water for a fifth aquifer and is connected to a main manifold through a submersible pump through a water pumping pipe, a fourth layer packer, a third layer packer, a second layer packer, a top packer and an eighth valve; the bottom pumping device mainly pumps water for a bottom aquifer and is connected to a main manifold through a submersible pump through a pumping pipe, a bottom packer, a fourth packer, a third packer, a second packer, a top packer and a ninth valve.

4. The multiple filter bed circulation well system of claim 3, wherein: the top packer, the second layer packer, the third layer packer, the fourth layer packer and the bottom packer all comprise upper joints, rubber cylinders, sliding ends and a central pipe, the upper joints, the sliding ends and the central pipe are all made of stainless steel materials, and the rubber cylinders are made of nitrile rubber; the upper joint is connected with the central pipe and the rubber barrel through inner and outer screw threads, the central pipe and the rubber barrel form a sealing ring cavity, the sliding end penetrates through the central pipe and is connected with the rubber barrel through the screw threads and slides along the central pipe along with the unsealing and shrinking of the packer, and the sliding end and the central pipe are sealed through two sealing rubber rings; the central pipe is provided with a liquid inlet for feeding liquid into the packer rubber barrel; the position of the packer corresponds to the water stop positions of all layers of the main well of the circulating well; the central pipes of the packers are connected in series through drill pipes, the seal opening media adopted by the top packer, the second layer packer, the third layer packer, the fourth layer packer and the bottom packer are liquid, high-pressure liquid is injected into the central pipes through a ground high-pressure pump, and the high-pressure liquid enters the rubber barrel through a liquid inlet of the central pipes, so that the rubber barrel of the packer is expanded under the action of pressure to complete seat sealing; after the operation is finished, releasing the pressure in the central pipe and the rubber sleeve through a ground pressure control system, withdrawing the packer after the release is finished, and lifting the packer out of the well; and a sealing joint is arranged at the bottom of the central pipe of the bottom packer.

5. The multiple filter bed circulation well system of claim 1, wherein: the top packer is provided with a second layer of water pumping channel, a third layer of water pumping channel, a fourth layer of water pumping channel, a fifth layer of water pumping channel and a bottom water pumping channel, each water pumping channel adopts a high-pressure rubber pipe and is arranged in an annular space between a packer rubber cylinder and a central pipe, two ends of the channel are sealed through sealing joints, and the sealing joints can be connected with the water pumping pipes through screw threads; compared with the top packer, the second layer packer reduces a second layer pumping channel and a water pump cable thereof, the third layer packer reduces a second layer, a third layer pumping channel and a water pump cable thereof, the fourth layer packer reduces a second layer, a third layer, a fourth layer pumping channel and a water pump cable thereof, and the bottom packer only reserves a bottom pumping channel and a water pump cable thereof.

6. The multiple filter bed circulation well system of claim 1, wherein: the layered water pumping device adopts a binding pipe descending method, and the operation method comprises the following steps: according to the pipe arrangement position in the pipe, the bottom water pumping device is downwards arranged in the well pipe through a water outlet pipe of the bottom water pumping device; after the water pumping pipe is lowered to the mounting position of the bottom packer, the water pumping pipe of the bottom water pumping device is connected with the lower end of a water pumping channel of the bottom packer, the upper end of the water pumping channel of the bottom packer is continuously connected with the water pumping pipe, the upper end of a central pipe of the bottom packer is connected with a drill rod, the water pumping pipe and the drill rod which are connected with the upper end of the bottom packer are bound and fixed through an iron wire or a binding tape, and the whole body of the drill rod is lowered into a well pipe; when the bottom packer is lowered to reach the design distance with the fifth layer water pumping device, the fifth layer water pumping device is lowered into the well pipe through the water pumping pipe, and is bound and fixed with the water pumping pipe and the drill pipe at the upper end of the bottom layer water pumping device through an iron wire or a binding belt, and is further lowered into the well pipe; when the fifth layer of water pumping device is put in to reach the design distance of a fourth layer of packer, the water pumping pipes of the bottom water pumping device and the fifth layer of water pumping device are respectively connected with the lower end of a water pumping channel of the fourth layer of packer, the lower end of a central pipe of the fourth layer of packer is connected with a drill rod at the upper end of the bottom packer, the upper end of the water pumping channel of the fourth layer of packer is respectively continuously connected with the bottom water pumping pipe and the water pumping pipe of the fifth layer of water pumping device, and the water pumping pipes and a connecting drill rod at the upper end of the fourth layer of packer are bound and fixed through iron wires or ribbons and are continuously put into a well pipe; repeating the operation method, and continuing to put a fourth layer of water pumping device, a third layer of packer, a third layer of water pumping device, a second layer of packer, a second layer of water pumping device, a top packer and a top water pumping device into the well pipe until all drilling tools are put into the well pipe; and installing the layered water pumping device on a wellhead through a wellhead tray.

7. A mode of operation of the multiple filter bed circulation well system according to any of claims 1 to 5, wherein: comprises a first pumping and first injecting cycle mode, wherein the first pumping and first injecting cycle mode comprises an upper pumping and lower injecting cycle mode or a lower pumping and upper injecting cycle mode;

the draw-up bet cycle mode: taking the top aquifer and the second aquifer as examples, pumping water to the top aquifer and injecting water to the second aquifer; firstly, opening a fourth branch valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer submersible pump is opened to pump water, and the water is injected into a second aquifer through a second layer injection pipe through a fourth valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, the water level of the top aquifer can descend along with the pumping and injection of the water, and the water level of the second aquifer can ascend to form a water level difference; under the action of the water head difference, the second aquifer supplies the top aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the groundwater circulation is not limited to the periphery of the well hole, but diffuses to the far end, and forms a groundwater circulation mode of pumping up and pouring down.

The lower pumping and upper injecting circulation mode is as follows: taking the top aquifer and the second aquifer as examples, pumping water to the second aquifer and injecting water to the top aquifer; firstly, opening a fifth branch valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve, a twenty-third main valve and a first branch valve, and closing other valves; opening the second layer of submersible pump to pump water, and injecting the water into the top aquifer through the top aquifer injection pipe through the fifth valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve, the twenty-third main valve and the first branch valve, wherein the water level of the top aquifer can rise and the water level of the second aquifer can fall to form a water level difference along with the pumping and injecting of the water; under the action of the water head difference, the top aquifer supplies the second aquifer, and the packer completely seals the top aquifer from the second aquifer, so that the underground water circulation is not limited to the periphery of the well hole, but diffuses towards the far end to form an underground water circulation mode of pumping down and injecting up.

8. A mode of operation of the multiple filter bed circulation well system according to any of claims 1 to 5, wherein: the method comprises a multi-pumping and one-injection circulation mode: the multi-pumping-injection circulation mode mainly aims at aquifers with poor pollution remediation effects, aquifers with poor water-rich properties or aquifers with weak hydrodynamic circulation of a circulation well, and the mode is that water of other aquifers is pumped to a target aquifer in a concentrated mode, so that the target aquifer and other aquifers form a large water head, and a strong hydrodynamic force is formed in the target aquifer, thereby enlarging a target aquifer hydrodynamic force regulation and control area, mainly solving the problem of pollution of the target aquifer and improving the overall pollution remediation efficiency of the circulation well; the multi-pumping and one-pouring cycle mode can be expanded into a five-pumping and one-pouring cycle mode at most;

taking a two-pumping and one-injecting circulation mode developed by the top aquifer, the second aquifer and the third aquifer as an example, the second aquifer has poor repairing effect, and the top aquifer and the third aquifer are pumped and injected with water. Firstly, opening a fourth branch valve, a sixth branch valve, a nineteenth main valve, a twentieth main valve, a twenty-first main valve, a twenty-second main valve and a second branch valve, and closing other valves; the top aquifer and the third aquifer are submerged pumps are opened to pump water, and the water is injected into the second aquifer through the fourth valve, the sixth valve, the nineteenth main valve, the twentieth main valve, the twenty-first main valve, the twenty-second main valve and the second branch valve through the second layer injection pipe, along with the pumping and the injection of the water, the water levels of the top aquifer and the third aquifer can fall, the water level of the second aquifer can rise, and a larger water level difference is formed; under the action of the water head, the second aquifer supplies the top aquifer and the third aquifer. Because the packer completely separates the top aquifer, the second aquifer and the third aquifer, the second aquifer circulates faster and the radius of circulation influence is larger under the driving of stronger water power.

9. A mode of operation of the multiple filter bed circulation well system according to any of claims 1 to 5, wherein: the system comprises a multi-pumping multi-injection circulation mode, is mainly used for realizing refined circulation restoration of a site pollution area, can simultaneously carry out independent pollution circulation restoration on a plurality of aquifers, and designs an independent circulation mode for restoration of each aquifer;

taking the three-pumping and three-injecting mode as an example, the top aquifer, the third aquifer and the fifth aquifer are pumped, and water is injected into the second aquifer, the fourth aquifer and the bottom aquifer respectively. Firstly, opening a fifth valve, a twentieth valve and a fourth valve, closing other valves, opening a top aquifer submersible pump to pump water, injecting a second aquifer through the fourth valve, the twentieth valve and the fifth valve, descending the water level of the top aquifer along with the pumping and injecting of water, ascending the water level of the second aquifer to form a water level difference, and opening the hydraulic circulation of the top aquifer and the second aquifer; then, opening a sixth valve, an eighteenth main valve and a seventh valve, closing other valves, opening a third aquifer submersible pump to pump water, injecting a fourth aquifer through the sixth valve, the eighteenth main valve and the seventh valve, descending the water level of the third aquifer and ascending the water level of the fourth aquifer along with the pumping and injecting of water, forming a water level difference, and opening the hydraulic circulation of the third aquifer and the fourth aquifer; and finally, opening the eighth valve 8, the sixteenth main valve and the ninth valve, closing other valves, opening the fifth aquifer submersible pump to pump water, injecting the water into the bottom aquifer through the eighth valve, the sixteenth main valve and the ninth valve, descending the water level of the fifth aquifer along with the pumping and injecting of the water, ascending the water level of the bottom aquifer to form a water level difference, and opening the hydraulic circulation of the fifth aquifer and the bottom aquifer. Therefore, relatively independent circulation modes are opened for the six aquifers, the circulation modes can be matched with different repairing appliances, processes and methods for circular repairing from bottom to top, and meanwhile, from the aspect of the overall circulation mode, the circulation well also opens a bottom-to-top progressive hydraulic circulation mode.

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