82 results about "Aquifer" patented technology

This invention discloses a method for optimizing and numerically simulating hydrological parameters of coalfield aquifers, relating to the field of coalfield hydrogeological exploration and groundwater numerical simulation technology. The method includes the following steps: Step S1: Obtain drilling monitoring data and historical hydrogeological data from multiple boreholes within the target coalfield area, construct an initial aquifer structure model, and generate an initial hydrological parameter field based on the initial aquifer structure model; Step S2: Based on the initial hydrological parameter field, construct an initial groundwater numerical simulation model, and calibrate and verify the initial groundwater numerical simulation model using preset observation well water level data to obtain a benchmark numerical simulation model; Through distributed fiber optic temperature and strain dual-field monitoring, and coupled Bayesian inversion of heat, solid, and fluid, this method overcomes the limitations of traditional pumping / pressure water tests, which suffer from single-point discretization, time lag, and the inability to obtain only static averages.

This invention relates to the field of geotechnical drilling engineering technology, and discloses a method for drilling small-diameter deep wells, comprising the following steps: using a positive circulation drilling rig to prepare a mud system based on the laterite soil of the construction site; using a composite reinforced roller cone bit for drilling operations in pebble layers; using a semi-automatic pulley system to connect or disconnect drill rods; using a positive circulation drilling rig to perform a segmented lifting and scraping wall composite process for drilling, in which a hole guide tool is used for scraping the wall; determining the depth of the aquifer before lowering the well casing; completing the butt joint connection of the well casing by welding, and completing the lowering and installation of the well casing; after the well casing is installed, sequentially performing mud replacement, air compressor agitation and well washing, and simultaneously completing the symmetrical backfilling of filter material; conducting a pumping test to complete the well completion quality acceptance. This invention can significantly improve drilling efficiency, well completion quality, and construction safety in complex pebble formations, while effectively reducing construction costs.

This invention discloses a method for in-situ protection of aquifers through cemented backfilling in fractured zones, belonging to the field of water-conserving mining technology. By acquiring the geological and mining technical conditions of the coal face, the key bearing strata are determined based on the key layer theory. The development height of the caving zone and the water-conducting fracture zone is calculated. When a key bearing stratum exists within 1 / 3 to 2 / 3 of the height of the water-conducting fracture zone, a fixed-stratum backfilling mode is adopted, determining the bottom of the key bearing stratum as the backfilling layer and using a fixed cemented backfilling step distance. When no key bearing stratum exists within this range, a variable-stratum backfilling mode is adopted. The backfilling layer is determined according to the evolution law of the water-conducting fracture zone, and the choice between fixed cemented backfilling step distance or no fixed cemented backfilling step distance is determined based on the coal seam thickness. This invention achieves adaptive selection of backfilling modes and quantitative determination of backfilling parameters, reducing the risk of hydraulic connectivity between the water-conducting fracture zone and the overlying aquifer, and realizing in-situ protection of the aquifer.

The application discloses a coalfield aquifer hydrological parameter optimization and numerical simulation method, relates to the technical field of coalfield hydrogeological exploration and groundwater numerical simulation, and comprises the following steps: step S1: obtaining drilling monitoring data and historical hydrogeological data of a plurality of drill holes in a target coalfield region, constructing an initial aquifer structure model, and generating an initial hydrological parameter field based on the initial aquifer structure model; step S2: constructing an initial groundwater numerical simulation model based on the initial hydrological parameter field, calibrating and verifying the initial groundwater numerical simulation model by using preset observation well water level data, and obtaining a benchmark numerical simulation model; through distributed optical fiber temperature and strain double-field monitoring, thermal, solid and flow coupling Bayesian inversion, the limitations of traditional pumping / pressure water tests, such as single-point dispersion, time lag and only static mean value acquisition, are broken through.

This invention discloses a system and method for measuring parameters affecting the drainage capacity of a gas storage facility undergoing aquatic redevelopment, comprising: a core holder for holding experimental cores; a water injection device for saturating the experimental cores with the held formation water; an outlet backpressure and measurement device for gradually reducing the pressure at the core outlet to a specified exhaustion lower limit pressure; a gas injection device for gas-driven operation on the cores whose outlet pressure has reached the exhaustion lower limit pressure; an inlet backpressure and measurement device for first injecting gas into the core inlet and then gradually reducing the pressure at the core inlet to measure the gas production and water production at each pressure point during the pressure reduction process when the inlet pressure drops to the specified exhaustion lower limit pressure; and a data processing device for calculating the dynamic recovery degree and dynamic expansion characteristics based on the water production and gas production at each pressure point.

The application provides a simulation system and experimental method for fracture water-bearing zone with periodic heat storage, and relates to the technical field of geothermal energy development and underground energy storage, which comprises a model box, the model box is filled with a porous medium, at least one fracture zone structure is constructed in the porous medium, and the fracture zone structure is filled with a material with a permeability greater than that of the porous medium; an injection-production circulation system, the injection-production circulation system comprises an injection well and a production well, and is buried in the porous medium in the model box; the injection well and the production well are connected to a fluid circulation system through pipelines, the fluid circulation system has switchable first and second working modes, wherein, in the first working mode, high-temperature hot water is provided to the injection well, and in the second working mode, the hot water extracted from the production well is recirculated to the injection well after being cooled; and a monitoring unit, the monitoring unit at least comprises a plurality of sensors for collecting temperature and pressure data inside the model box. The application effectively improves the simulation accuracy of the fracture zone on the water and heat migration process.

This invention relates to the field of hydrogeological exploration technology and discloses a method for accurately predicting aquifer inflow by integrating conventional and electromagnetic flow logging. The method includes the following steps: Step 1: Well logging data acquisition. Electromagnetic flow logging and conventional logging are performed simultaneously in the target exploration borehole to obtain static and dynamic flow response amplitude curves, apparent resistivity curves, natural gamma curves, and sonic transit time data. This method for accurately predicting aquifer inflow by integrating conventional and electromagnetic flow logging data constructs a key parameter system covering four dimensions: "water storage space - recharge power - water storage capacity - permeability resistance." It also utilizes the powerful nonlinear fitting capability of a generalized regression neural network (GRNN) to establish a prediction model, effectively overcoming the shortcomings of traditional theoretical formulas in adapting to complex geological conditions.

This invention discloses a method for joint allocation and optimization of multiple water sources in underground reservoirs, specifically relating to the field of water resource allocation technology. The method includes basic parameter acquisition and spatial coordinate alignment, grid cell dual-accessibility attribute labeling, grid-based reservoir capacity effectiveness classification and twin mapping construction, full-cycle supply and demand parameter collection and time-period segmentation, and time-period supply and demand matching and allocation scheme generation. This invention unifies the spatial benchmark of multi-source parameters through cross-data source spatial coordinate matching and alignment, achieving precise spatial correspondence between grid-level hydrogeological and engineering node parameters. It links the spatial matching of single grid cells with recharge and extraction nodes to aquifer parameters for accessibility labeling, classifies reservoir capacity effectiveness based on dual thresholds, constructs a reservoir capacity mapping with dual constraints, segments the entire cycle into equal-length time periods for matching supply and demand parameters, completes time-period supply and demand matching and reservoir capacity iterative updates, and achieves temporal linkage between recharge and extraction, accurately matching the spatiotemporal distribution of multi-source water supply and irrigation water demand.

The application provides a system and method for treating combustion flue gas by using underground aquifer. The system comprises a pretreatment unit, an injection unit and an injection-production well unit. The pretreatment unit is used for cooling, removing particulate matters and removing water from the combustion flue gas. The injection unit comprises a first gas storage device and a gas injection pump device connected in sequence. The gas inlet of the first gas storage device is connected with the gas outlet of the pretreatment unit. The injection-production well unit comprises an injection well for injecting the combustion flue gas into a target underground aquifer and a production well for producing gas from the target underground aquifer. The injection well is communicated with the production well, the well spacing is 200-400 meters and the injection-production well unit meets the requirements of low injection and high production. The material outlet of the gas injection pump device is connected with the wellhead of the injection well. The target underground aquifer is an anticline structure or an inclined structure and the water saturation is more than 80%. The technical scheme provided by the application can effectively realize the collaborative elimination of CO2 and atmospheric pollutants in the flue gas.

This invention discloses a membrane contact electrocatalytic oxidation in-situ soil and groundwater remediation device, comprising: multiple underground well pipes installed in the remediation area for gas transport and catalytic reaction; multiple pumping wells for extracting groundwater contaminated by organic pollutants in the soil; injection wells for reinjecting treated clean water into the aquifer; and multiple monitoring wells for testing water samples after wastewater treatment to evaluate the remediation effect and water quality changes. This invention also discloses a membrane contact electrocatalytic oxidation in-situ remediation method for organic polluted groundwater. This invention alleviates the problem of oxidant self-decomposition by continuously generating strong oxidant H2O2 liquid in the underground well pipes during the electrocatalytic process. The pressure of the continuously input original gas drives the H2O2 liquid into the remediation area, causing rapid oxidation of oxides in the wastewater.

The application discloses a deep underground aquifer heat storage simulation experiment system and experiment method, relates to the technical field of underground aquifer heat storage simulation experiment, and the technical scheme of the deep underground aquifer heat storage simulation experiment system of the application simulates the environment of the real deep underground aquifer by adopting a deep aquifer simulation device, simulates the real heat storage process by using a hot fluid injection device and a hot fluid extraction device, and arranges multiple optical fiber temperature monitoring devices and multiple optical fiber pressure monitoring devices in the experimental rock sample at intervals, so that the temperature and pressure of multiple positions of the experimental rock sample before, during and after heat storage can be monitored, the temperature and pressure changes of multiple positions on the three-dimensional space of the heat storage rock are monitored in real time, and the rules of temperature conduction, fluid diffusion, pressure transmission and permeability attenuation in the deep aquifer heat storage process can be effectively analyzed.

This invention discloses an intelligent monitoring and safety early warning system for water exploration and drainage in coal mines, belonging to the field of coal mine hydrogeological safety monitoring technology. The system includes a multi-dimensional sensing module (1), a data acquisition substation (2), an edge intelligent computing unit (3), a wireless transmission unit (4), a surface monitoring platform (5), and an intrinsically safe power supply module (6); the multi-dimensional sensing module (1) integrates a hydrological sensing unit and a mine explosion-proof AI visual verification unit, which are deployed in water exploration and drainage boreholes, low-lying areas of roadways, and aquifer exposure locations to simultaneously collect water level, water pressure, seepage flow, ambient temperature and humidity, and borehole fluid images; the AI ​​visual verification unit covers the borehole opening and the spray area in front, accurately capturing the morphological characteristics of water inrush; the data acquisition substation (2) completes the synchronous acquisition and noise reduction preprocessing of multiple signals; the edge intelligent computing unit (3) has a built-in water inrush precursor identification model and adaptive threshold mechanism based on borehole trajectory spatiotemporal registration, which triggers graded early warning by combining hydrological data and visual image dual-modal verification; the edge intelligent computing unit (3) has a built-in non-volatile storage medium, which maintains early warning operation and automatically resumes transmission even when the network is disconnected; the wireless transmission unit (4) The invention employs a mine-grade explosion-proof wireless communication module for interference-resistant transmission; the surface monitoring platform (5) enables real-time monitoring, curve display, graded alarms, data storage, and report export. This invention achieves 24-hour unattended automatic monitoring, timely early warning response, comprehensive explosion-proof protection, extremely low false alarm rate, lightweight and easy deployment, and can accurately identify water inrush hazards, significantly improving the safety management level of coal mine water exploration and drainage operations and the survival guarantee of underground personnel.

This invention discloses a supercritical gas injection simulation method for deep-earth energy storage projects. This method constructs a computational framework for supercritical gas-salt two-phase flow based on the lattice Boltzmann method, utilizes the Shan-Chen two-component model to characterize the interaction between supercritical gas and water, and introduces a continuous surface force model equation to controllably couple interfacial tension, thereby achieving numerical simulation of supercritical gas injection under high density ratio and high surface tension conditions. Through an improved force term discretization scheme and independent adjustment of the surface tension term, high-precision recovery of force balance at the interface is achieved, significantly improving simulation stability and physical consistency. This invention fills the gap in the lattice Boltzmann method for simulating the displacement, migration, and storage behavior of various supercritical gases in porous aquifers or fractured grids, and can provide technical support for the design, operation, and safety assessment of deep-earth energy storage projects.

The application discloses a loose aquifer infiltration recharge position and infiltration amount confirmation method, and specifically implements the following steps: step 1, selecting each water level observation hole drawdown value; step 2, selecting a solution area of the infiltration recharge position; step 3, carrying out grid division on the solution area selected in step 2; step 4, calculating the distance between each grid division area center point and each water level observation hole; step 5, taking each grid division area center point as the infiltration recharge position, and calculating the corresponding infiltration recharge amount of each grid division area; step 6, calculating the variance of the corresponding infiltration recharge amount of each grid division area; and step 7, calculating the infiltration recharge position based on the minimum variance. The loose aquifer infiltration recharge position and infiltration amount confirmation method solves the problem that the infiltration recharge position and the infiltration recharge amount of the loose layer are difficult to accurately confirm, and greatly reduces the investment of hydrogeological exploration work.

The application discloses a kind of low permeability reservoir CO2 drive oil storage simulation method and system, the simulation method includes: establishing low permeability reservoir CO2 drive oil storage model;The low permeability reservoir CO2 drive oil storage model is solved, and grid pressure distribution, component concentration distribution and crude oil viscosity distribution result are obtained.Improve the recovery efficiency of low permeability reservoir, while achieving the goal of increasing CO2 storage capacity.The model considers the adsorption of CO2 on the pore surface, the dissolution of crude oil, the dissolution of formation water and the mineralization of aquifer, etc.The model also considers stress sensitivity and threshold pressure gradient to reflect the characteristics of low permeability reservoir.

The present application relates to the technical field of ecological hydrological forecasting and water resources scheduling, in particular to a method for predicting ecological runoff by coupling pumping test and two-dimensional hydrodynamic model, S1, collecting basin topography and lithology parameters and calculating aquifer effective thickness, S2, planning pumping test observation hole depth, S3, determining water flow shear stress zoning and numerical viscosity coefficient, S4, coupling condition initialization and obtaining initial results of ecological runoff prediction. The present application focuses on the accurate collection of topographic features and lithology parameters of different sections of the basin, sorts out the interface relationship of the topography zoning aquifer, optimizes the layout of the observation hole combined with the characteristics of the ecological runoff sensitive area and the recharge area, determines the water flow shear stress zoning and optimizes the hydrodynamic discrete format by correlating the topography and flow velocity relationship, optimizes the coupling conditions by comparing real-time monitoring data, realizes accurate control of the distribution characteristics of the aquifer, improves the adaptability of the observation hole layout, optimizes the discrete effect of the hydrodynamic model, and improves the accuracy and reliability of the ecological runoff prediction.

This application relates to the field of geological exploration technology, and in particular to an intelligent prediction system and method for complex structures that integrates geological knowledge graphs and deep learning. The method includes: acquiring a real-time exploration dataset of the exploration area; based on the real-time exploration dataset, analyzing the stress distribution trend, microseismic activity rhythm, and aquifer lithology and pore structure under roof water inrush phenomena to obtain a multi-dimensional dynamic feature information set; based on the multi-dimensional dynamic feature information set, constructing a multi-dimensional analysis framework for the direct and indirect interactions between different parameter sets within the multi-dimensional dynamic feature information set; based on the multi-dimensional analysis framework, combining geological knowledge graphs and deep learning algorithms, deriving the complex structural features of the exploration area to obtain dynamic derivation results, generating an exploration structure-water inrush association rule base. Recording roof water inrush risks provides targeted safety decision-making basis for exploration projects, reducing the probability of subsequent water inrush accidents and ensuring the safety of personnel and equipment.

This invention discloses an analytical method for micro-water testing and permeability coefficient inversion considering a finite-thickness negative thin-walled layer and the non-Darcy effect within the layer. A mathematical model for micro-water testing considering the finite-thickness negative thin-walled layer and the non-Darcy effect within the layer is constructed. Based on the radial dual-zone medium assumption, seepage within the negative thin-walled layer is generalized as Forchheimer-type seepage, while seepage within the aquifer is linear Darcy flow. The Laplace transform and Brady method are introduced to handle the nonlinear terms, and the well water level is derived. H ( t Semi-analytical solutions in semi-infinite and finite domains. During parameter inversion, high-frequency, high-precision water level gauges deployed in the test well are used to collect water level response data after excitation, generating... H Follow t The permeability coefficients of the negative thin-walled layer and the aquifer are calculated simultaneously by comparing the measured curves with the standard curves and then performing inversion calculations. K i This invention is the first to achieve simultaneous inversion of the permeability coefficients of negative thin-walled layers and aquifers, and significantly improves the efficiency of permeability coefficient measurement in micro-water tests. K i The accuracy of the value.

The application discloses a micro water test model analysis and permeability coefficient value inversion calculation method based on a nonlinear seepage theory, establishes a complete well micro water test analysis model of a confined aquifer which can explicitly describe the influence of the global non-Darcy effect in the aquifer, adopts a Forchheimer equation to describe a nonlinear seepage field, processes the nonlinear term by using a Laplace transform and a Brady method, and realizes accurate solution of well water level H(t) by using a Talbot algorithm for numerical inversion. High-frequency and high-precision water level pressure sensors arranged in a test well and at different observation points are used to collect and record water level distribution of an initial background seepage field and water level response data after a micro water test is excited, so that the seepage state of the seepage field in the aquifer is determined. In the inversion process of the permeability coefficient value of the aquifer, a change rule curve of the well water level H with time t is generated based on the water level response data of the test well, and the permeability coefficient K value of the aquifer is inverted by comparing the fitting of the measured value with a standard curve.

This invention discloses a method for determining mining modes and parameters for in-situ protection of roof aquifers, belonging to the field of coal mining technology. The method includes: obtaining geological and hydrogeological parameters and mining technical parameters; calculating the weighted equivalent strength of the overburden and determining the strength type and fracture-to-mining ratio; calculating the development height of the water-conducting fracture zone, determining the equivalent filling rate coefficient and the minimum thickness required for strata modification, and inversely calculating the maximum value of the hypothetical mining height to coal seam thickness ratio that meets the requirements of water-conserving mining; determining the appropriate water-conserving mining mode based on this ratio; and determining the key technical parameters for water-conserving mining under different mining modes. This invention establishes a technical solution system covering three water-conserving mining modes, achieving coordinated maximization of coal resource development and water-conserving mining under different geological and hydrogeological conditions, enabling parallel mining and filling operations, and significantly improving the efficiency and reliability of water-conserving mining.

An installation for the geological sequestration of carbon dioxide can include a structure and a device for injecting a flow of carbon dioxide into a geological reservoir. The injection device can include an injection pipe and a device for extracting a flow of water from the geological reservoir. The extraction device can include an extraction pipe. The installation further can include a heat exchanger that can be connected to the injection and extraction pipes. Operating the installation can include injecting the flow of carbon dioxide into the reservoir, simultaneously extracting the flow of water from the reservoir, and bringing the flows of carbon dioxide and of water into thermal contact in the exchanger.

This invention discloses a method for calculating the inflow volume of a confined aquifer foundation pit considering a cutoff wall. The method includes: considering the effect of a suspended cutoff wall, dividing the seepage field near the cutoff wall into a flow around the wall and a non-flow around the wall, and introducing a seepage path length influence coefficient for the flow around the wall; obtaining a calculation formula for the inflow volume of the confined aquifer foundation pit based on the seepage path length influence coefficient according to Darcy's law; obtaining the foundation pit inflow volume through numerical simulation, and obtaining the relationship between the seepage path length influence coefficient and the cutoff wall insertion ratio; establishing a fitting formula between the seepage path length influence coefficient and the cutoff wall insertion ratio, and substituting the relevant values ​​into the calculation formula for the inflow volume of the confined aquifer foundation pit to obtain the inflow volume of the confined aquifer foundation pit considering the cutoff wall. This invention overcomes the problem that conventional calculation methods do not consider the cutoff wall, introduces the seepage path length influence coefficient and its determination method, and provides accurate results for the calculated inflow volume of the confined aquifer foundation pit, providing a theoretical basis for similar projects.

This invention relates to the field of oilfield development technology and discloses a well-seismic combined method for reorganizing reservoir stratigraphy in sandstone oilfields, comprising the following steps: S1, acquiring well logging data, seismic data, and geological data to establish a high-resolution sequence stratigraphic framework; S2, using well-seismic combined technology to draw sedimentary facies maps and identify the distribution characteristics and development differences of reservoir sand bodies; S3, analyzing the dynamic development effect of the reservoir, including water cut, recovery rate, and remaining oil distribution development indicators; S4, optimizing the stratigraphic combination method, sealing high water-cut layers, and reorganizing effective development stratigraphic layers; S5, adjusting the well network deployment, combining new drilling and old well conversion for injection, and optimizing well spacing and injection-production relationship. By using well-seismic combined technology to finely segment reservoirs, optimize stratigraphic layers and injection-production well network deployment, and combine dynamic monitoring to adjust injection-production configuration in real time, the problem of inter-layer interference is solved, water injection displacement efficiency is improved, and high efficiency and stability of oilfield development are achieved.

This invention belongs to the field of monitoring wells, specifically a seismic-gas coupled monitoring well applicable to the geological sequestration of carbon dioxide in mining spaces. It includes a well drilled from the surface to the goaf. During drilling, monitoring systems are installed at the goaf, fracture zone, aquifer, and upper loose layer. Each monitoring system includes a protective tubing system and monitoring components such as sensors arranged within it. A connecting tubing system is also provided to connect the protective tubing system. The inner tubing of all tubing systems forms a sealed pipeline cavity, within which a transmission pipeline is installed and led to the surface. This invention, through a vertical architecture design of one well and four layers, establishes a full-path monitoring barrier from the goaf, fracture zone, overlying aquifer, loose layer to the surface. The segmented isolation design of the monitoring system not only accurately locates the specific layer where CO2 leaks but also effectively distinguishes between leakage and interference, facilitating accurate evaluation of CO2 geological sequestration leakage.

This application discloses a multi-method fusion method for predicting tunnel water inflow, including: statistically analyzing calculation parameters from advanced geological prediction (TSP) and calculating the predicted water inflow; obtaining apparent resistivity, permeability coefficient, and aquifer hydrogeological calculation parameters based on field pumping tests or transient electromagnetic advanced geological prediction; calculating the theoretical water inflow using a non-Darcy flow-based underground dynamics theory; calculating the maximum total tunnel water inflow by combining the predicted water inflow and the theoretical water inflow; and calculating the dynamic change value of the water inflow by statistically analyzing the attenuation pattern of water inflow in excavated sections or reference projects, using spring attenuation formulas or linear attenuation formulas. This method can be conveniently and quickly applied to practical engineering projects, achieving accurate and dynamic prediction of tunnel water inflow.

The application provides a burnt rock water hazard treatment method based on well-ground segmented exploration and drainage, comprising the following steps: step one, determining the water enrichment zoning of the burnt rock aquifer; step two, determining the ground water drainage hole arrangement; step three, draining the top burnt rock water level by using the ground water drainage hole; step four, determining the downhole directional drilling hole arrangement; step five, determining the downhole directional water drainage hole arrangement; step six, draining the top burnt rock water level by using the downhole directional water drainage hole; step seven, verifying the drainage effect and supplementing the drainage. The application superimposes the burnt rock bottom boundary contour map and the surface valley distribution map to comprehensively determine the water enrichment zone distribution of the burnt rock aquifer, improves the exploration precision of the burnt rock aquifer water enrichment boundary, and provides an accurate target for the water exploration and drainage drilling hole arrangement. On this basis, the defects that the traditional ground or downhole water exploration and drainage method cannot effectively cover the burnt rock water enrichment abnormal zone are overcome, the drainage effect is improved, and the safety of the large roadway excavation and the working face mining is ensured.

The application discloses a mine strong aquifer water draining method, comprising the following steps: step one, determining the position and drilling structure of vertical large-diameter water draining well; step two, drilling and excavating the vertical well to the bottom of the strong aquifer by following the pipe; step three, making a water filtering sleeve; step four, lowering the water filtering sleeve and laying a grouting pipe; steps five to seven, gravel grouting well cementation; step eight, lowering a gas bag and inflating; step nine, determining the position of long-distance horizontal well; step ten, excavating the horizontal well pilot hole section and the horizontal well water draining section; step eleven, back-acting the horizontal well sleeve; step twelve, taking out the gas bag; step thirteen, cutting off the horizontal well sleeve in the vertical well; step fourteen, salvaging the sediment; and step fifteen, opening the horizontal well water draining section. The vertical large-diameter water draining well and the multiple water draining combined wells realize the combination of treatment and drainage of the burned and altered rock water, the burned and altered rock water can be self-flowing drained, the burned and altered rock water head is reduced, the threat of the burned and altered rock water to the coal mining is reduced, and the treatment and drainage cost is reduced.

The application discloses a similar simulation test system and a similar simulation test method, which injects sodium hydroxide solution into an upper aquifer and water into a lower aquifer, collects water gushing from a goaf in a liquid storage tank, pours quantitative solution in the liquid storage tank into a sampling reaction tank, slowly adds hydrochloric acid solution with the same concentration into the sampling reaction tank, and observes temperature change in the sampling reaction tank, so that contribution of the upper and lower aquifers to water gushing in the goaf, water gushing amount or water supplementing amount can be determined, and current liquid / water amount of the upper and lower aquifers can be determined, important guiding data for research on aquifer water resource protection is provided, and different protection modes can be selected according to actual water gushing conditions of each layer.

The application discloses a groundwater multistage oxidation-reduction remediation system for high-risk heterochromatic pollution plume, relates to the technical field of groundwater remediation, and performs three-dimensional layering and high-permeability / low-permeability structure identification on an aquifer, delimits a target treatment area and oxidation stages, transition stages, reduction stages and a gatekeeping area, collects a baseline, sets red oxygen windows and arrival criteria for each layer, lays out a layered isolation multi-channel well pattern, constructs an extraction-recharge inward hydraulic gradient and sets a safety interlock, distributes injection proportions according to sectional equivalent injection impedance and the arrival criteria, superimposes micro-amplitude pressure oscillation on continuous low flow, and adds oxidants after wellheads; impedance attenuation and filtration pressure difference are tracked to trigger reverse extraction or cleaning, a self-cleaning solid loop is established, layered out-of-phase switching is performed, and gatekeeping emergency scheduling is carried out. The method improves uniformity of coverage, reduces external escape and residual pockets, reduces near-well blockage, and can restore operation capacity.

The embodiment discloses a kind of microseismic monitoring mine goaf fissure method, device, equipment and medium. Among them, the method comprises: in the process of carrying out water pumping test to mine goaf, tracer is injected to specified aquifer, and water pumping test is carried out to mine goaf;Wherein, water pumping test includes water discharge test and pumping test, and the specified aquifer is the nearest aquifer to mine goaf;In the case where tracer is found in the water extracted by pumping test, it is determined that there is fissure zone;By the microseismic vertical monitoring network established in advance, the crack development position corresponding to fissure zone is predicted.The method can reduce the fissure detection error of mine goaf, improve the fissure detection accuracy of mine goaf, can accurately detect the floor weak zone of mine goaf, predict the crack development position corresponding to fissure zone, provide effective address data for subsequent underground reservoir construction, save time cost and labor cost.