Well structure for injecting suspended-state repairing agent

Abstract

The utility model discloses a well structure for injecting a suspended state repairing agent. The well structure comprises an injection well, a lower end injection pipeline and an upper end injection pipeline, wherein the lower end injection pipeline downwards penetrates into the injection well from the top of the injection well; the upper end injection pipeline is arranged on the side wall of one side of the top of the injection well; and a Y-shaped tee joint is arranged at the bottom of the lower end injection pipeline. By adopting the well structure, the migration and distribution uniformity of the suspended state repairing agent is remarkably improved, the reaction efficiency with pollutants is enhanced, meanwhile, the repairing cost is reduced, the construction period is shortened, and the repairing quality is ensured. Meanwhile, the problem that in a traditional injection method, when the repair depth exceeds the injection range or the repair medium is bed rock, it is difficult to inject suspended-state repair agents is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of soil and groundwater remediation, more particularly to a well structure for injecting suspended state remediation reagent. BACKGROUND

[0002] With the rapid development of industrialization and urbanization, soil and groundwater pollution problems have become increasingly serious, posing a significant threat to the ecosystem and human health. In the process of exploring pollution control technologies, researchers have found that using in-situ chemical / biological remediation technology to repair contaminated soil and groundwater using suspended state remediation reagent, especially using iron powder for environmental remediation, has significant advantages.

[0003] Currently, the traditional method for injecting suspended state remediation reagent is direct push injection method, but it cannot be used when the remediation depth exceeds the injection range (usually about 15m) or the remediation medium is bedrock.

[0004] In the field of groundwater remediation, injection well method is a common technical means for injecting suspended liquid into the ground as a remediation reagent. However, in actual operation, this method faces multiple challenges. Suspended state remediation reagent is prone to agglomeration and precipitation due to its physical and chemical properties, which not only may cause the injection well to be quickly clogged, hindering normal operation, but also may interrupt the remediation work. The problem of clogging or wellhead reconstruction often requires additional manpower, material resources and time investment, significantly increasing the remediation cost and prolonging the construction period. Diluting the suspended state remediation reagent to increase its injection volume may alleviate the injection volume problem to some extent, but it also brings new problems. The increase in water volume significantly increases the probability of surface passivation of the suspended state remediation reagent (such as iron powder), reduces the reactivity of the reagent with pollutants, and weakens its ability and efficiency to degrade pollutants. In addition, the traditional gravity or pressurized injection method has shortcomings in reagent dispersibility, clogging reduction and migration ability enhancement, making it difficult to meet the needs of efficient remediation.

[0005] At the same time, for the suspended state remediation reagent made of iron powder, the dilution of iron powder to increase the injection volume also reduces its activity due to the surface passivation of iron powder, further weakening the remediation effect.

[0006] The existing utility model patent "A method, device and process for preventing clogging when injecting powdered remediation reagent into a water-bearing layer of pores (Patent No. CN116696447A)" proposes a "injection + extraction" cycle process to solve the clogging problem during the injection of suspended liquid. However, this method has the problem of too low injection concentration (mass ratio less than 0.3%), which leads to too large water proportion. If the suspended liquid is iron powder, it will increase the degree of surface passivation. In addition, since the injection method is not pulse type, the suspended liquid is easy to deposit in the soil pores after entering the water-bearing layer, affecting its migration ability.

[0007] In order to solve these technical problems, the utility model provides an innovative suspension state repair reagent injection well structure. The technical innovation aims to solve the problems of well deposition, pore blockage, difficult migration of reagent, uneven migration and low injection concentration encountered in the process of injecting the suspension state repair reagent by the traditional injection well method, so as to effectively save the repair cost, shorten the construction period and guarantee the repair quality. Utility model content

[0008] The utility model aims at solving the problems of well deposition, pore blockage, difficult migration of reagent, uneven migration and low injection concentration in the process of injecting the suspension state repair reagent by the traditional injection well method. Based on this, a well structure for injecting the suspension state repair reagent is provided.

[0009] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0010] A well structure for injecting the suspension state repair reagent, comprising: an injection well, a lower end injection pipeline and an upper end injection pipeline;

[0011] Wherein, the lower end injection pipeline penetrates from the top of the injection well to the inside of the injection well; the upper end injection pipeline is arranged on the side wall of one side of the top of the injection well;

[0012] The bottom of the lower end injection pipeline is provided with a Y-shaped tee joint.

[0013] Preferably, the Y-shaped tee joint is provided with at least two, and they are connected with each other.

[0014] The Y-shaped tee joints are uniformly distributed around the lower end injection pipeline, for increasing the cross-sectional area of the upward impact of the reagent;

[0015] Preferably, the bottom of the Y-shaped tee joint at the bottom is provided with a pipe plug.

[0016] The Y-shaped tee joint + pipe plug mode is adopted at the bottom, which can promote the upward flow of the repair reagent through the Y-shaped tee joint, avoiding the problem of deposition of the suspension state repair reagent in the well during the injection process.

[0017] Preferably, the pipe plug is 30-50cm away from the bottom of the injection well, so as to avoid the blockage of the injection port of the lower end Y-shaped tee joint by the sludge in the well.

[0018] The working principle of the utility model is as follows: a pulse pump is used to inject the suspension state repair reagent into the upper end injection pipeline and the lower end injection pipeline at the same time;

[0019] Wherein, the pulse frequency of the pulse pump is 50-500 times per minute;

[0020] The pressure in the injection well is 0.2Mpa-1.0Mpa;

[0021] The mass ratio of the insoluble solute in the suspension-state remediation agent is less than or equal to 30%;

[0022] The injection flow rate is calculated by the following formula:

[0023]

[0024] Q=KAv*n.

[0025] In the above formula, Q is the injection flow rate, v is the injection flow rate, P is the injection pressure, p is the density of the suspension-state remediation agent, K is the permeability coefficient of the soil, A is the surface area of the flower tube, and h is the porosity of the flower tube. o

[0026] Preferably, the pulse pump comprises a diaphragm pump, a peristaltic pump, a rotary piston pump, a plunger pump or a vane pump.

[0027] The prepared suspension-state remediation agent is synchronously injected through the injection ports of the upper and lower injection pipelines of the injection well, the upper injection port causes the agent to flow downward, and the lower injection port causes the agent to move upward due to the special design of the Y-shaped tee joint and the pipe plug, thereby effectively avoiding the deposition problem at the bottom of the well. Under the action of a certain pressure, the remediation agent is uniformly penetrated into the soil through the flower tube.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] (1) The utility model provides a novel well structure, which can simultaneously inject the agent at the well mouth and the well bottom, and can solve the deposition problem of the agent at the well bottom;

[0030] (2) The utility model adopts the structure of the Y-shaped tee joint combined with the pipe plug (the lower end of the Y-shaped tee joint is sealed by the pipe plug) for the injection pipeline at the well bottom, which further cleverly prevents the deposition of the suspension-state remediation agent in the well;

[0031] (3) The injection method of the utility model adopts the pulse injection form, and solves the problems of the suspension-state remediation agent in the soil, such as blockage, difficult migration and uneven migration;

[0032] (4) Through the effective combination of the suspension-state remediation agent injection well structure and the use method, the purposes of guaranteeing the remediation quality, saving the remediation cost and the construction period are achieved. Specifically, ① the suspension-state remediation agent does not deposit at the well bottom, the migration distance is far, and the agent is uniformly distributed in the soil, thereby guaranteeing the remediation quality; ② the well structure and the use method can be used for multiple injections, and can be used for the remediation of the depth exceeding the injection range of the direct pushing type injection method or the remediation of the bedrock;

[0033] ​(5) using the injection well structure and injection method, the injection quality ratio (the insoluble medicament addition ratio can reach 30%) can be increased, the injection concentration can be increased, the passivation problem of the iron powder type suspension state repair medicament can be reduced, and the purposes of reducing manpower, material and medicament costs and reducing repair period are finally achieved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0035] Figure 1 The well structure for injecting the suspension state repair medicament of the present application is shown in the figure.

[0036] Figure 2 The operation schematic diagram of the present application for injecting the suspension state repair medicament is shown in the figure.

[0037] Figure 3 The schematic diagram of the Y-shaped tee joint + pipe block structure of the present application is shown in the figure.

[0038] In the figure:

[0039] 1-injection well; 2-lower end injection pipeline; 3-upper end injection pipeline; 41-Y-shaped tee joint 1; 42-Y-shaped tee joint 2; 5-pipe block; 6-flower pipe. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] Embodiment 1

[0042] The present embodiment provides a well structure for injecting a suspension state repair medicament, comprising: an injection well 1, a lower end injection pipeline 2 and an upper end injection pipeline 3.

[0043] Among them, the lower end injection pipeline 2 penetrates from the top of the injection well 1 to the inside of the injection well 1; the upper end injection pipeline 3 is arranged on the side wall of one side of the top of the injection well 1.

[0044] The bottom of the lower end injection pipeline 2 is provided with two connected Y-shaped tees 41 and 42, and the bottom of the lowermost Y-shaped tee 42 is provided with a pipe plug 5, which is 30-50 cm away from the bottom of the injection well 1.

[0045] Example 2

[0046] In a certain chemical reduction technology remediation project, the remediation area is 100 m 2 , and the zero-valent iron-based reduction reagent is used for a 25-meter-deep soil + bedrock fissure chlorinated hydrocarbon contaminated site. The reagent formula also contains molasses, sodium lactate and other components, among which the mass fraction of insoluble zero-valent iron in water reaches 30%.

[0047] The pneumatic diaphragm pump pulse injection is adopted, and the set injection pressure is 0.3 Mpa, and the injection flow rate is between 2.9-4.8 m 3 / h.

[0048] The injection well 1 adopts the upper and lower synchronous injection mode, and the lower end injection pipeline 2 is equipped with Y-shaped tees 41 and 42, and the bottom of the lower Y-shaped tee 42 is provided with a pipe plug 5, which is accurately kept 40 cm above the bottom of the well, ensuring uniform distribution of the reagent and avoiding deposition. The well depth of the injection well 1 is 25.5 m, of which 25-25.5 m is a sedimentation pipe, and the diameter of the injection well 1 is 60 mm.

[0049] The single-well test accumulates about 500 kg of iron powder in 2 hours.

[0050] During the injection process, 7 groundwater monitoring wells at different distances around the injection well were monitored in real time through rapid detection methods such as conductivity and magnet adsorption. The contaminated groundwater was extracted through the Bell tube, and the magnet adsorbed iron powder on the side wall of the Bell tube to verify whether the iron powder migrated to the groundwater monitoring well. The conductivity detector was used to test the conductivity of the groundwater, and the conductivity was further demonstrated whether the iron powder migrated. The field rapid detection results show that the conductivity of the groundwater monitoring well has changed significantly, and iron powder has been found in the groundwater monitoring well. The specific data are shown in the following table.

[0051] Table 1: Rapid detection results of conductivity and magnet adsorption

[0052]

[0053] As can be seen from the above table, by comparing the size of the groundwater conductivity and the content of the iron powder before and after the injection of the suspension state remediation reagent made of iron powder and other reagents, the conductivity of each groundwater monitoring well increased significantly after the injection, and iron powder was found.

[0054] Later, through the way of magnet detecting well and actually measuring well depth, whether the well pipe is blocked is determined. The well depth is measured, and it is found that the well depth is 25.1 m, and the design well depth is 25.5 m. Considering that the sediment pipe deposition is a normal phenomenon, it is judged that the zero-valent iron powder is not deposited in the well. The iron powder in the well is adsorbed by the magnet, and a large amount of iron powder is not found on the magnet, which further proves that the iron powder is deposited at the well bottom. The groundwater monitoring well 4.5 m away from the injection well has a significant increase in conductivity and iron powder is found, which proves that the iron powder has a long migration distance, uniform migration, and is not blocked in the soil pores. This verifies the efficient operation of the injection system and the wide distribution and penetration of the remediation agent.

[0055] In combination with the embodiment, it can be further illustrated that the patent of the utility model can effectively solve the problems of well bottom deposition, soil pore blockage, migration difficulty and unevenness, and low injection concentration in the process of suspending state remediation agent injection.

[0056] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0057] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A well structure for injecting suspended remediation agents, characterized in that, include: Injection well, lower injection conduit, and upper injection conduit; The lower injection pipe extends downward from the top of the injection well into the interior of the injection well; the upper injection pipe is disposed on the side wall of the top of the injection well. A Y-shaped tee is provided at the bottom of the lower injection pipe.

2. The well structure for injecting suspended remediation agents according to claim 1, characterized in that, At least two Y-type tees are provided, and they are interconnected.

3. A well structure for injecting suspended remediation agents according to claim 2, characterized in that, The bottom of the Y-shaped tee is fitted with a pipe plug.

4. A well structure for injecting suspended remediation agents according to claim 3, characterized in that, The plug is located 30-50 cm from the bottom of the injection well.

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