CN116592933B - Aquifer blockage monitoring system and monitoring method for in-situ injection repair - Google Patents
Aquifer blockage monitoring system and monitoring method for in-situ injection repair Download PDFInfo
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- CN116592933B CN116592933B CN202310885023.4A CN202310885023A CN116592933B CN 116592933 B CN116592933 B CN 116592933B CN 202310885023 A CN202310885023 A CN 202310885023A CN 116592933 B CN116592933 B CN 116592933B
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- 238000002347 injection Methods 0.000 title claims abstract description 118
- 239000007924 injection Substances 0.000 title claims abstract description 118
- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 32
- 230000008439 repair process Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003814 drug Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 230000008859 change Effects 0.000 claims abstract description 17
- 230000000903 blocking effect Effects 0.000 claims abstract description 15
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 238000003895 groundwater pollution Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 239000003673 groundwater Substances 0.000 claims description 83
- 230000002829 reductive effect Effects 0.000 claims description 10
- 238000005067 remediation Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000008177 pharmaceutical agent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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Abstract
The application discloses an aquifer blockage monitoring system and a monitoring method for in-situ injection repair, wherein the monitoring system comprises an observation well, a flow velocity and direction instrument is arranged in the observation well, and the flow velocity and direction instrument is in signal connection with a control room on the ground so as to acquire the flow velocity and the flow direction of an injection medicament injected through the injection well at the observation well; the injection well is arranged on the outer peripheral side of the observation well so as to inject a medicament for treating and repairing groundwater pollution towards the injection well, and the medicament can flow outwards through the observation well; and judging whether the water-bearing layer is blocked or not and the blocking degree according to the change of the flow velocity and the flow direction of the medicament. The monitoring system and the monitoring method for the aquifer blockage provided by the application have the advantages of reasonable structure and convenience in operation, and can be used for finely identifying the unfavorable area of the aquifer blockage caused by medicament injection so as to improve or optimize the effect of an in-situ injection technology on the treatment and repair of the groundwater pollution.
Description
Technical Field
The application belongs to the technical field of groundwater remediation, and relates to a monitoring system and a monitoring method for in-situ injection remediation of a water-bearing stratum blockage.
Background
The treatment and repair of groundwater pollution are gaining more and more importance, wherein the in-situ injection technology is the most widely applied technology in groundwater repair technology, and more technical researches are being made.
In most cases of in-situ groundwater injection and restoration, after oxidant, reducing agent, stabilizing agent and microbial agent are injected, the concentration of the agent is high near the injection well, the reaction is severe, and the medium of the water-bearing layer may be blocked. The aquifer media plug comprises: (1) the medicament and the substance to be repaired form a precipitate to cause blockage; (2) the medicament and organic matters in the water-bearing layer medium form floccules to cause blockage; (3) the microbial agent forms a biological film to cause blockage; (4) the acid-base condition of the underground water is changed to form floccules or precipitate to cause blockage and the like.
If the blocking condition occurs, the on-site slurry reverse condition can occur in the construction, so that larger medicament and mechanical cost are wasted; the situation that the medicament is seriously reduced in the underground diffusion rate and is consumed and disabled in an aquifer when the medicament is not reacted with pollutants can also occur; and then the preferential channel is formed by fracturing, so that the medicament is lost to the local direction and cannot reach the repair reaction area. Moreover, the condition belongs to underground hidden events, and is generally found by checking when abnormal conditions are found in the water quality monitoring of the monitoring well for multiple times, so that serious medicament and construction period waste are caused.
In the existing repairing implementation process, the change of the blocking condition of the aquifer is judged through the change of the injection quantity and the pressure of the medicament, but false negative errors often exist, namely the aquifer is blocked locally, but the medicament migrates from other dominant channels, so that the injection operation section is not easy to detect the change. Furthermore, the method for judging the effect of repairing the influence of the water-bearing layer blockage through the flow speed and flow direction monitoring is necessary for advocating accurate repair and green sustainable repair under the future 'double-carbon' background.
Therefore, there is a need to design an aquifer blockage monitoring system and monitoring method for in-situ injection repair, which solve the existing technical problems.
Disclosure of Invention
The application aims at solving the technical problems, and provides an aquifer blockage monitoring system and an aquifer blockage monitoring method for in-situ injection repair, which are reasonable in structure and convenient to operate, and can be used for finely identifying unfavorable areas of aquifer blockage caused by medicament injection so as to improve or optimize the effect of in-situ injection technology on groundwater pollution treatment and repair.
In order to solve the technical problems, the application provides an aquifer blockage monitoring system for in-situ injection repair, which comprises an observation well, wherein a flow velocity and direction instrument is arranged in the observation well and is in signal connection with a control room on the ground so as to acquire the flow velocity and direction of groundwater at the observation well; the injection well is arranged on the outer peripheral side of the observation well so as to inject a medicament for treating and repairing groundwater pollution towards the injection well, and the medicament can flow outwards through the observation well; and judging whether the aquifer is blocked and the blocking degree according to the change of the flow velocity and the flow direction of the underground water.
In some embodiments, the distance between the observation well and the injection well is less than or equal to the restoration impact radius of the in situ injection technique.
In some embodiments, the collection time of the flow rate and direction instrument is not less than 10min, so as to read flow rate and direction data in a stable state.
In some embodiments, the flow velocity and direction meter is used for measuring flow velocity and direction data of groundwater in a state of injecting clean water and flow velocity and direction data of groundwater in a state of injecting medicament, and analyzing and judging whether the flow velocity and direction data of groundwater in a state of injecting medicament is changed significantly or not based on the flow velocity and direction data of groundwater in a state of injecting clean water under a flow condition.
In some embodiments, the flow velocity and direction meter is used for measuring flow velocity and direction data of groundwater in a natural state and flow velocity and direction data of the intermittent period after the medicament is injected, and analyzing and judging whether the flow velocity and direction data of the intermittent period after the medicament is injected is changed significantly or not based on the flow velocity and direction data of the groundwater in the natural state.
Meanwhile, the application also discloses a method for monitoring the aquifer blockage for in-situ injection repair, which uses the system for monitoring the aquifer blockage for in-situ injection repair, and comprises the following steps:
step one, determining a restoration influence radius of an in-situ injection technology according to hydrogeological conditions of an area where groundwater to be restored is located, and setting an observation well in the restoration influence radius;
setting a flow velocity and direction instrument in the observation well, and measuring the flow velocity and direction data of underground water at the position of the observation well in a natural state after the measurement data of the flow velocity and direction instrument are stable;
injecting clean water towards the injection well, and measuring flow velocity and flow direction data of underground water at the position of the observation well;
step four, injecting a medicament towards an injection well, and measuring flow velocity and flow direction data of groundwater at the position of an observation well;
step five, measuring flow velocity and flow direction data of groundwater at the position of the observation well in an intermittent period after the injection of the medicament;
and step six, comparing the analysis flow rate and flow direction data, and judging the blocking condition of the aquifer.
In some embodiments, if the injected medicament state is reduced to less than 1/2 of the flow rate of the groundwater corresponding to the injected clear water state, a blockage occurs in the aquifer between the injection well and the observation well; if the flow rate of groundwater corresponding to the state of injecting the medicament is increased to more than 5 times compared with the state of injecting clear water, judging that a dominant channel formed by blockage or fracturing occurs at the local position of an aquifer between an injection well and an observation well.
Further, if the flow direction of the groundwater is changed by more than 30 degrees in the state of injecting the medicament compared with the state of injecting the clean water, the local position of the water-bearing layer between the injection well and the observation well is seriously blocked or a dominant channel formed by fracturing is formed in the reverse position.
In some embodiments, in step three and step four, the flow rate of the injected medicament is the same as the flow rate of the injected clear water.
In some embodiments, the flow rate and flow direction data of the groundwater in a natural state are used as reference, analysis and judgment are performed to determine whether the intermittent flow rate and flow direction data after the medicament is injected have significant changes, and further confirmation and verification are performed to the blocking condition of the aquifer.
If the flow rate of groundwater corresponding to the intermittent state after the injection of the medicament is reduced to less than 1/2 than the natural state, the aquifer between the injection well and the observation well is blocked; if the intermittent state after the injection of the medicament is more than 5 times of the flow velocity of the groundwater corresponding to the natural state, judging that the partial position of the water-bearing layer between the injection well and the observation well is blocked or fractured to form a dominant channel.
If the intermittent state after the injection of the medicament is more than 30 degrees compared with the natural state corresponding to the flow direction change of the groundwater, the local position of the water-bearing layer between the injection well and the observation well is confirmed to be severely blocked or a dominant channel formed by fracturing at the reverse position is formed.
The application has the beneficial effects that:
the monitoring system and the monitoring method for the aquifer blockage provided by the application have the advantages of reasonable structure and convenience in operation, and can be used for finely identifying the unfavorable area of the aquifer blockage caused by medicament injection so as to improve or optimize the effect of an in-situ injection technology on the treatment and repair of the groundwater pollution.
Drawings
The above-described advantages of the present application will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the application, wherein:
FIG. 1 is a schematic diagram of a monitoring system for aquifer blockage according to the present application;
FIG. 2 is a schematic diagram of groundwater flow direction when no blockage of the aquifer occurs;
FIG. 3 is a schematic diagram of groundwater flow direction when an aquifer is blocked;
FIG. 4 is a flow chart of a method of monitoring aquifer blockage according to the present application;
FIG. 5 is a schematic flow of groundwater at a location of an observation well in a natural state;
FIG. 6 is a flow chart of groundwater flow speed at the observation well of FIG. 5;
FIG. 7 is a schematic flow of groundwater at the location of the observation well when the injection well injects clean water;
FIG. 8 is a flow chart of groundwater flow speed at the observation well of FIG. 7;
FIG. 9 is a schematic flow of groundwater at the location of an observation well when an injection well injects a chemical;
FIG. 10 is a flow chart of groundwater flow speed at the observation well of FIG. 9;
FIG. 11 is a schematic flow of groundwater at a location of an observation well during an intermittent period after a drug injection state of an injection well;
fig. 12 is a flow chart of groundwater flow speed at the observation well of fig. 11.
Detailed Description
The present application will be described in detail with reference to specific embodiments and drawings.
The examples described herein are specific embodiments of the present application, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the application to the embodiments and scope of the application. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification, including those adopting any obvious substitutions and modifications to the embodiments described herein.
The drawings in the present specification are schematic views, which assist in explaining the concept of the present application, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present application, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
A schematic diagram of an aquifer blockage monitoring system for in situ injection remediation according to the present application is shown in fig. 1. The monitoring system comprises an observation well 10, wherein a flow rate and direction instrument 20 is arranged in the observation well 10, and the flow rate and direction instrument 20 is in signal connection with a control room 30 on the ground so as to acquire the flow rate and the flow direction of underground water at the observation well 10; the injection well 40 is provided at the outer circumferential side of the observation well 10 to inject a chemical for groundwater pollution control and repair toward the injection well 40, the chemical being capable of flowing to the outside through the observation well 10; and judging whether the aquifer is blocked and the blocking degree according to the change of the flow velocity and the flow direction of the underground water, and periodically evaluating the underground water restoration effect.
According to darcy's law, under certain injection conditions, the injection flow rate of the injection well 40 is relatively stable, for example, under the condition that the injection flow rate does not change significantly, the change of the water level of the observation well 10 is affected by the regional flow field, and the change amplitude is small. Groundwater in-situ injection repair construction is difficult to discover that a groundwater aquifer in a certain direction is blocked in time, but permeability is poor in a blocked area and the direction, groundwater flow speed is obviously reduced, and correspondingly, flow speed of other areas is possibly increased due to geological condition factors. The following is a calculation formula of the groundwater flow speed V:
wherein K is the aquifer permeability coefficient;
is the water level of the injection well;
is the water level of the observation well; l is the distance between the injection well and the observation well.
In the present application, the flow rate of groundwater in the observation well 10 is first determined, if the flow rate of groundwater is significantly changed, the permeability coefficient of the aquifer is gradually reduced, which indicates that a blocking condition has occurred, and the flow direction can be further determined, if the flow direction of groundwater is significantly changed, which indicates that a serious blocking has occurred.
As one embodiment of the present application, the distance between the observation well 10 and the injection well 40 is less than or equal to the restoration impact radius of the in situ injection technique.
Further, the single collection time of the flow meter 20 is not less than 10min, so as to read the flow data in the steady state.
In the present application, the flow velocity and direction meter 20 is used for measuring the flow velocity and direction data of the groundwater in the state of injecting the clean water and the flow velocity and direction data of the groundwater in the state of injecting the medicament, and analyzing and judging whether the flow velocity and direction data of the groundwater in the state of injecting the medicament is significantly changed or not based on the flow velocity and direction data of the groundwater in the state of injecting the clean water under the condition of flow.
Further, the flow velocity and direction meter 20 is used for measuring the flow velocity and direction data of the groundwater in the natural state and the flow velocity and direction data of the intermittent period after the injection of the medicament, and analyzing and judging whether the flow velocity and direction data of the intermittent period after the injection of the medicament is significantly changed based on the flow velocity and direction data of the groundwater in the natural state.
Fig. 2 is a schematic view of groundwater flow direction when no blockage of the aquifer occurs, and after the chemical is injected from the injection well 40, the chemical spreads along with groundwater in the direction of the observation well 10, so as to realize groundwater remediation. At this time, the flow direction of the groundwater at the position of the observation well 10 is horizontal.
Fig. 3 is a schematic diagram of groundwater flow direction when an aquifer is blocked, and the presence of a blocking zone between the injection well 40 and the observation well 10 causes a significant change in groundwater flow direction at the observation well 10, which also reflects a more severe blocking of the aquifer.
Meanwhile, the application also discloses a method for monitoring the aquifer blockage for in-situ injection repair, which is shown in a flow chart in fig. 4, and the method for monitoring the aquifer blockage for in-situ injection repair by using the system for monitoring the aquifer blockage for in-situ injection repair comprises the following steps:
step one, determining a restoration influence radius of an in-situ injection technology according to hydrogeological conditions of an area where groundwater to be restored is located, and setting an observation well 10 in the restoration influence radius;
specifically, the radius of the repair effect under in-situ injection conditions is determined according to the repair scheme and the results of the early hydrogeologic tests, and the appropriate position of the observation well 10 is selected. In fig. 5, the observation well 10 is arranged in the north direction 5m of the injection well 40;
step two, arranging a flow velocity and direction instrument 20 in the observation well 10, and measuring the flow velocity and direction data of the groundwater at the position of the observation well 10 in a natural state after the measurement data of the flow velocity and direction instrument 20 are stable;
specifically, the flow rate and direction instrument 20 is installed in the observation well 10, and the flow rate and direction data are collected for a single time of not less than 10 minutes. Flow rate and direction condition data in the steady state during the observation period are read from the flow rate and direction meter 20. The observation well 10 was measured to have a groundwater flow speed of about 1m/s and a groundwater flow direction of about 300 ° in a natural state, as shown in fig. 5, i.e., in a northwest direction. In the application, the degree is increased clockwise with the north direction of 0 degrees.
FIG. 6 is a flow chart of groundwater flow speed at the observation well of FIG. 5, the abscissa indicates time, and the left ordinate indicates flow speed, indicated by filled circles; the ordinate on the right represents the flow direction, indicated by the solid triangle. In FIG. 6, the observation well 10 has a groundwater flow speed of about 1m/s and a groundwater flow direction of about 300.
Step three, injecting clean water towards the injection well 40, and measuring flow velocity and flow direction data of groundwater at the position where the observation well 10 is located;
and in the water test and injection stage, under the same operation condition, the flow speed and flow direction data are collected and analyzed to obtain the flow speed and flow direction data, as shown in fig. 7.
Fig. 8 is a flow rate flow chart of groundwater at the observation well of fig. 7, and the groundwater flow speed of the observation well 10 is significantly changed in a state of injecting clear water, which is raised to a level of about 2-6m/s (average about 4 m/s) while the groundwater flow direction is changed to 0 ° (360 °), i.e., the north direction.
Step four, injecting the medicament towards the injection well 40, and measuring the flow rate and flow direction data of the groundwater at the position of the observation well 10;
fig. 9 is a flow diagram of groundwater at a location of an observation well when an injection well injects a chemical, and fig. 10 is a flow diagram of flow rates of groundwater at the observation well of fig. 9. As can be seen from fig. 10, the injection of the pharmaceutical agent has caused a significant change in the aquifer permeability compared to the injection of the clear water, and the groundwater flow speed at the observation well 10 is reduced from a level of 2-6m/s (about 4m/s on average) to a level of 0.5-1m/s (about 0.8m/s on average). Meanwhile, the fluctuation amplitude of the groundwater flow direction is increased, and the main flow direction is changed to 120 degrees, namely, the direction of the southeast (0 degrees in the north direction) is changed, and the degree is increased clockwise.
In the third and fourth steps, the flow rate of the injected medicament is the same as the flow rate of the injected clean water.
Step five, measuring flow velocity and flow direction data of groundwater at the position of the observation well 10 in an intermittent period after the injection of the medicament;
fig. 11 is a flow diagram of groundwater at a position of an observation well in an intermittent period after a state of injecting a chemical agent into the injection well, and fig. 12 is a flow diagram of groundwater flow at the observation well in fig. 11. As can be seen from fig. 12, the flow rate of groundwater in the observation well 10 was about 0.5m/s in the intermittent period after the injection of the chemical agent, and the flow direction of groundwater in the observation well was also significantly changed to 350 °.
Step six, comparing and analyzing the flow speed and flow direction data, and judging the blocking condition of the aquifer;
comparing the flow rate data of the injection medicament state and the injection clear water state, and judging that the water-bearing layer between the injection well 40 and the observation well 10 is blocked when the flow rate of the groundwater in the injection medicament state is reduced to be less than 1/2 of the injection clear water state;
further, comparing flow direction data of the injection agent state and the injection clear water state, wherein the groundwater flow direction is changed from 0 degree of the injection clear water state to 120 degrees of the injection agent state, the change range is 120 degrees to be more than 30 degrees, and serious blockage of an aquifer between the injection well 40 and the observation well 10 is judged;
the position of serious blockage can be judged to be in the north direction and the northeast direction of the injection well according to the change of the groundwater flow direction from 0 degree in the state of injecting clean water to 120 degrees in the state of injecting medicament (shown in figure 9);
because the fluctuation of the flow rate and the flow direction data measured by the instrument is large due to the large operation pressure when the clear water is injected and the medicament is injected, the judgment degree of change is interfered to a certain extent, in some embodiments, in order to improve the judgment precision and eliminate the interference of injection pressurization, the judgment result needs to be verified for the second time, namely, the flow rate and the flow direction data in the intermittent period after the natural state and the medicament injection state are compared, whether the flow rate and the flow direction data are obviously changed is analyzed and judged, and the blocking condition of the aquifer is further confirmed:
by comparing flow velocity data of the natural state and the intermittent period after the injection of the medicament, the flow velocity of groundwater is reduced from 1m/s of the natural state to 0.5m/s of the intermittent period after the injection of the medicament, and 1/2 is reduced, the occurrence of the blockage of the aquifer between the injection well 40 and the observation well 10 can be judged, and further, by comparing flow velocity data of the intermittent period after the injection of the medicament with flow velocity data of the natural state, the flow velocity of groundwater is changed from 300 degrees of the natural state to 350 degrees of the intermittent period after the injection of the medicament, the change amplitude is 50 degrees to more than 30 degrees, and the occurrence of the serious blockage of the aquifer between the injection well 40 and the observation well 10 is judged.
The second verification confirms that a serious blockage of the aquifer between the injection well 40 and the observation well 10 has occurred; the position of the serious blockage was confirmed to be in the north-positive direction and the northeast-positive direction of the injection well.
After on-site drilling verification, the construction of the injection well and the supplementary injection of the medicament are supplemented in the northeast corner area, so that the restoration effect of the overall area is ensured to reach the standard.
Thus, by the above method, the adverse region of the aquifer blockage caused by the injection of the drug can be finely identified, and after the abnormal situation occurs, improvement or optimization measures in construction need to be analyzed and decided.
Compared with the defects and the shortcomings of the prior art, the monitoring system and the monitoring method for the aquifer blockage provided by the application are reasonable in structure and convenient to operate, and can be used for finely identifying the unfavorable area of the aquifer blockage caused by medicament injection so as to improve or optimize the effect of the in-situ injection technology on the treatment and repair of the groundwater pollution.
The present application is not limited to the above embodiments, and any person can obtain other products in various forms under the teaching of the present application, however, any changes in shape or structure of the products are included in the scope of protection of the present application, and all the products having the same or similar technical solutions to the present application are included in the present application.
Claims (4)
1. An aquifer blockage monitoring method for in-situ injection remediation, using an aquifer blockage monitoring system for in-situ injection remediation, comprising:
step one, determining a restoration influence radius of an in-situ injection technology according to hydrogeological conditions of an area where groundwater to be restored is located, and setting an observation well (10) in the restoration influence radius;
setting a flow velocity and direction instrument (20) in the observation well (10), and measuring the flow velocity and direction data of underground water at the position of the observation well (10) in a natural state after the measurement data of the flow velocity and direction instrument (20) are stable;
injecting clean water towards an injection well (40), and measuring flow velocity and flow direction data of the underground water at the position of an observation well (10);
injecting a medicament towards an injection well (40), and measuring flow velocity and flow direction data of groundwater at the position where an observation well (10) is located;
step five, measuring flow velocity and flow direction data of groundwater at the position of the observation well (10) in an intermittent period after the injection of the medicament;
step six, comparing and analyzing the flow speed and flow direction data, and judging the blocking condition of the aquifer;
the aquifer blockage monitoring system for in-situ injection repair comprises an observation well (10), wherein a flow velocity and direction instrument (20) is arranged in the observation well (10), and the flow velocity and direction instrument (20) is in signal connection with a control room (30) on the ground so as to acquire the flow velocity and direction of groundwater at the observation well (10); the injection well (40) is arranged on the outer peripheral side of the observation well (10) so as to inject a medicament for treating and repairing groundwater pollution towards the injection well (40), and the medicament can flow outwards through the observation well (10); judging whether the aquifer is blocked and the blocking degree according to the change of the flow velocity and the flow direction of the underground water;
in the sixth step, if the flow rate of groundwater corresponding to the state of injecting the medicament is reduced to less than 1/2 compared with the state of injecting clean water, the aquifer between the injection well (40) and the observation well (10) is blocked; if the flow rate of groundwater corresponding to the state of injecting the medicament is increased to more than 5 times compared with the state of injecting clean water, judging that the local position of an aquifer between an injection well (40) and an observation well (10) is blocked or a dominant channel formed by fracturing is formed.
2. The method for monitoring the blockage of the aquifer for in-situ injection repair according to claim 1, wherein in the sixth step, if the flow direction of the groundwater correspondingly changes by more than 30 degrees in the state of injecting the medicament than in the state of injecting the clean water, a dominant channel formed by serious blockage or serious fracturing occurs at the local position of the aquifer between the injection well (40) and the observation well (10).
3. The method for monitoring the blockage of an aquifer for in-situ injection repair according to claim 2, wherein in the third and fourth steps, the flow rate of the injected medicament is the same as the flow rate of the injected clear water.
4. The method for monitoring the blockage of the aquifer for in-situ injection repair according to claim 3, wherein in the sixth step, the flow velocity and flow direction data of the groundwater in a natural state are taken as references, whether the flow velocity and flow direction data in an intermittent period after the injection of the medicament are obviously changed is analyzed and judged, and further the blockage condition of the aquifer is verified and confirmed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310885023.4A CN116592933B (en) | 2023-07-19 | 2023-07-19 | Aquifer blockage monitoring system and monitoring method for in-situ injection repair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310885023.4A CN116592933B (en) | 2023-07-19 | 2023-07-19 | Aquifer blockage monitoring system and monitoring method for in-situ injection repair |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116592933A CN116592933A (en) | 2023-08-15 |
| CN116592933B true CN116592933B (en) | 2023-09-26 |
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