CN110793752A - Device and method for testing field underground water connectivity - Google Patents

Abstract

The invention discloses a groundwater connectivity test device and method in the field, comprising a gas-making booster mechanism, a valve, a pressure sensor, a flow sensor, a communicator, a controller, a packer and a bubbler, a valve, a pressure sensor and a flow rate sensor. The sensor is installed on the upper side of the well cover of the injection well, the packer and the bubbler are installed on the lower side of the well cover of the injection well, the gas pressure booster is connected to the valve, the controller is connected to the valve, the pressure sensor and the flow sensor communicate with the control unit through the communicator The gas produced by the gas pressurization mechanism can enter the injection well through the valve, packer and bubbler. The invention can prevent the exogenous chemical tracer from entering the ground water, and at the same time can indicate the connectivity of hydrogeological parameters such as the flow velocity and direction of the ground water.

Description

A field groundwater connectivity testing device and method

technical field

The invention relates to the field of groundwater science, in particular to a field groundwater connectivity testing device and method.

Background technique

In the field of groundwater science, groundwater connectivity testing is an important test method to master the hydrogeological parameters such as groundwater connectivity, flow velocity, and flow direction. Generally, a tracer is often used at a certain upstream location, and the water is sampled at multiple downstream monitoring points. method of tracer concentration. However, during the study of groundwater hydrogeological parameters, it was found that many research sites are located in densely populated areas or important water sources. The color change of groundwater caused panic among residents. Therefore, the inventors believe that the conventional method of dosing chemical tracers is gradually unsuitable for areas with dense population or where important water sources exist, and such groundwater connectivity testing is necessary.

SUMMARY OF THE INVENTION

In order to solve the problem that the conventional method of adding chemical tracers is gradually unsuitable for areas with dense population or important water sources, the present invention proposes a method that can prevent exogenous chemical tracers from entering groundwater, and at the same time can indicate Field test method for connectivity of hydrogeological parameters such as groundwater velocity and flow direction. The method uses gas-phase fluid in natural air as an indicator, and uses the method of monitoring gas and gas content to determine the groundwater flow rate and direction.

The first object of the present invention is to provide a field groundwater connectivity test device.

The second object of the present invention is to provide a method for testing groundwater connectivity in the field.

First of all, the present invention discloses a field groundwater connectivity test device, including a gas pressure booster mechanism, a valve, a pressure sensor, a flow sensor, a communicator, a controller, a packer and a bubbler, a valve, a pressure sensor and a flow rate The sensor is installed on the upper side of the manhole cover of the injection well, the packer and the bubbler are installed on the lower side of the manhole cover of the injection well, the gas pressure boosting mechanism is connected to the valve, the controller is connected to the valve, and the pressure sensor and flow sensor are connected to the control device through the communicator. The gas produced by the gas pressurizing mechanism can enter the injection well through the valve, the packer and the bubbler.

Further, the air making and boosting mechanism is an air pump.

Further, the valve includes a connected overflow valve and a pressure reducing and restricting valve.

Further, the communicator is a wired communicator or a wireless communicator.

Further, when the communicator is a wired communicator, the communicator is connected to the flow sensor and the pressure sensor through a wire, and the communicator is connected to the controller through a wire.

Further, when the communicator is a wireless communicator, the communicator is connected to the flow sensor and the pressure sensor through a wire, and the communicator is connected to the controller through a wireless connection.

Further, a conduit is also included, and the gas-producing and boosting mechanism, the valve, the pressure sensor, the flow sensor, the communicator, the controller and the bubbler are all installed or connected to the conduit.

Further, the packer is installed below the water surface of the injection well; the bubbler is installed on the lower side of the packer.

Secondly, the invention also discloses a method for testing groundwater connectivity in the field. The gas enters the aquifer from the injection well through the conduit through the valve, the pressure sensor, the flow sensor, the well cover, the packer and the bubbler. Once the gas enters the injection well , the pressure sensor will send out the corresponding pressure rise signal, the communicator will transmit the pressure rise signal to the controller and record. Then the gas enters the monitoring well through the aquifer. Once the gas enters the monitoring well, the gas pressure in the monitoring well rises, so that the gas pressure in the well is slightly higher than the atmospheric pressure. The controller controls the monitoring well valve to open, and the gas continues to discharge steadily. At this time, the pressure sensor and flow sensor Continuous communication and recording through the communicator and the controller, at the same time, the discharged gas samples are taken regularly and the gas component content is analyzed. Combined with the data signals of the pressure sensor and the flow sensor, the total amount of indicated gas in the well is monitored.

Further, select multiple monitoring wells in the investigation and research area to implement the described field groundwater connectivity test method. When no indication gas is detected from multiple monitoring wells, it is determined that there is no connection between the groundwater and the injection well in this survey location, otherwise There is connectivity.

Compared with the prior art, the present invention has the following advantages:

1. In the present invention, it is only necessary to carry out certain transformations to traditional hydrological monitoring wells or water wells. Specifically, it is only necessary to install the field groundwater connectivity test device of the present invention in the injection wells and the monitoring wells. , and the field groundwater connectivity testing device of the present invention can avoid the impact of inputting chemical reagents on groundwater quality, better protect the groundwater ecological environment, and is a green and environmentally friendly field testing method for connectivity.

2. The traditional test method needs to invest a large amount of chemical reagents at one time, and the cost is relatively high, while the present invention avoids the use of chemical tracers as consumables, and the equipment involved can be reused, and the gas used can be directly obtained from The air is obtained by the air pump, which greatly reduces the test cost.

3. In the present invention, using the air pressure sensor and the flow sensor to assist in judging the gas trace can reduce the manual input, which is different from the traditional testing method that requires regular sampling and testing, which costs a lot of testing costs, and the regular sampling and testing may miss the initial arrival time. The method shown in the invention has the characteristics of real-time detection of gas in the monitoring well, the pressure sensor can detect the gas arriving in the monitoring well at the first time, and does not need to sample and detect before the gas reaches the well, which can improve the accuracy of test parameters, and can also improve the accuracy of testing parameters. Reduce comprehensive testing costs.

Description of drawings

The accompanying drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

FIG. 1 is a schematic diagram showing the structure of the device shown in Embodiment 1. FIG.

In the figure, 1-air pressure boosting mechanism; 2-decompression and restrictor valve; 3-relief valve; 4-pressure sensor; 5-flow sensor; 6-well cover; 7-cementing ring; 8-conduit; 9-water surface; 10-packer; 11-aquifer; 12-bubbler; 13-forecast groundwater flow direction; 14-wireless communicator; 15-controller; I-injection well; II-monitoring well.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

As described in the background art, in order to solve the problem that the above-mentioned conventional method of adding chemical tracers is gradually unsuitable for areas with dense population or important water sources, the present invention proposes a method that can avoid the entry of exogenous chemical tracers. Groundwater, and at the same time can indicate groundwater velocity, flow direction and other hydrogeological parameters of connectivity field test method. The method uses gas-phase fluid in natural air as an indicator, and uses the method of monitoring gas and gas content to determine groundwater flow rate and flow direction. The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

Example 1

First of all, this embodiment discloses a field groundwater connectivity test device, including a gas pressure boosting mechanism 1 , a valve, a pressure sensor 4 , a flow sensor 5 , a communicator, a controller 15 , a packer 10 and a bubbler 12 , the valve, the pressure sensor 4 and the flow sensor 5 are installed on the upper side of the well cover 6 of the injection well 1, the packer 10 and the bubbler 12 are installed on the lower side of the well cover 6 of the injection well 1, and the gas-producing and boosting mechanism 1 is communicated with the valve , the controller 15 is connected to the valve, the pressure sensor 4 and the flow sensor 5 are connected to the controller 15 through the communicator; the gas generated by the gas-producing and boosting mechanism 1 can enter the injection well 1 through the valve, the packer 10 and the bubbler 12 It can be understood that the injection well I in this embodiment is an existing injection well I opened for the field groundwater connectivity test, and is not a unique device in this embodiment.

It should be noted that the valve in this embodiment includes a pressure reducing and restricting valve 2 and an overflow valve 3 .

It can be understood that both the injection well I and the monitoring well II in this embodiment are provided with a cementing ring 7 .

The air making and boosting mechanism 1 is an air pump. In this embodiment, the air pump is used as a component capable of inputting gas, and its function is to provide a gas source to the field groundwater connectivity test device in this embodiment. Therefore, the selection of the air pump in this embodiment must meet the requirements of being able to The gas may be pushed into the aqueous layer 11 .

The valve includes a connected overflow valve 3 and a pressure reducing and limiting valve 2 . This is a commonly used device in the field, and it is unnecessary to repeat it here. It still needs to be explained that the relief valve 3 and the pressure reducing and limiting valve 2 in this embodiment are connected to the controller 15, so they need to use supporting Connect the model of the controller 15.

The communicator is a wired communicator or a wireless communicator 14 .

It can be understood that the wired communicator in this embodiment may be a router or a switch or a PC bus, and the wireless communicator 14 in this embodiment may be a wireless signal transmitter, such as a radio frequency signal transmitter, a Bluetooth signal transmitter , the connection between the wired communicator/wireless communicator 14 and the pressure sensor 4/flow sensor 5 in this embodiment is a common knowledge well known to those skilled in the art, and will not be repeated here.

In this embodiment, the wireless communicator 14 is used in the specific implementation process to obtain a more flexible connection manner.

When the communicator is a wired communicator, the communicator is connected to the flow sensor 5 and the pressure sensor 4 through wires, and the communicator is connected to the controller 15 through wires.

When the communicator is the wireless communicator 14 , the communicator includes a wireless transmitter and a wireless receiver, the wireless transmitter is connected with the flow sensor 5 and the pressure sensor 4 through wires, and the wireless receiver is connected with the controller 15 .

Also included is a conduit 8 to which the gas-producing and boosting mechanism 1 , valve, pressure sensor 4 , flow sensor 5 , communicator, controller 15 and bubbler 12 are mounted or connected.

The packer 10 is installed below the water surface 9 of the injection well 1; the bubbler 12 is installed on the lower side of the packer 10.

Specifically, the packer 10 is placed below the groundwater level to prevent the gas from migrating upward; the bubbler 12 is placed at the position of the aquifer 11 to allow the gas to disperse in the groundwater and accelerate the entry of the gas with the groundwater. Aquifer 11 process.

The controller 15 in this embodiment adopts a PC, and in other embodiments, the controller 15 may adopt an MCU or a PLC.

Example 2

This embodiment discloses a method for testing groundwater connectivity in the field. The gas enters the aquifer 11 from the injection well 1 through the conduit 8 through the valve, the pressure sensor 4, the flow sensor 5, the well cover 6, the packer 10, and the bubbler 12. Once gas enters the monitoring well II, the pressure sensor 4 will send out a corresponding pressure rise signal, and transmit the pressure rise signal to the controller 15 through the communicator, and then the controller 15 controls the valve in the monitoring well II to open, so that the gas pressure in the well is opened. Slightly greater than the atmospheric pressure, at this time, the pressure sensor 4 and flow sensor 5 in the monitoring well II are in continuous communication with the controller 15 through the communicator, and at the same time, the discharged gas samples are taken regularly and the content of gas components is analyzed. Combined with the pressure sensor 4 and the flow sensor 5 The data signal monitors the total amount of indicated gas in Well II. It can be understood that the monitoring well II in this embodiment also belongs to the prior art.

Further, select a plurality of monitoring wells II in the investigation and research area to implement the described field groundwater connectivity test method, and when none of the plurality of monitoring wells II detects an indicator gas, it is determined that the groundwater in this survey location is not connected to the injection well. , otherwise there is connectivity.

It can be understood that, in this embodiment, the pressure sensor 4 in the injection well 1 continuously transmits a pressure signal to the controller 15, and the flow sensor 5 continuously transmits a flow signal to the controller 15, and the pressure signal reflects the pressure on the pipe wall of the conduit 8. Pressure, since the conduit 8 is connected to an air pump, the specific value measured is the air pressure in the conduit 8, and the flow signal reflects the flow of the gas circulating in the conduit 8. If the gas pressure in the monitoring well II is slightly greater than the atmospheric pressure If the pressure signal continuously transmitted by the pressure sensor 4 is greater than the atmospheric pressure, and the flow signal continuously transmitted by the flow sensor 5 is greater than zero, it means that there is gas circulation in the monitoring well II, and the monitoring well II and the injection well I aquifer are connected.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A field underground water connectivity test device is characterized by comprising a gas production pressurization mechanism, a valve, a pressure sensor, a flow sensor, a communicator, a controller, a packer and a bubbler, wherein the valve, the pressure sensor and the flow sensor are arranged on the upper side of a well lid of an injection well, the packer and the bubbler are arranged on the lower side of the well lid of the injection well, the gas production pressurization mechanism is communicated with the valve, the controller is connected with the valve, and the pressure sensor and the flow sensor are connected with the controller through the communicator; gas produced by the gas booster mechanism can pass through valves, packers and bubblers into the injection well.

2. The field ground water connectivity test device of claim 1, wherein the gas pressurization mechanism is a gas pump.

3. A field ground water connectivity test device according to claim 1, wherein the valve includes an overflow valve and a pressure reducing restriction valve connected.

4. The field ground water connectivity test device of claim 1, wherein the communicator is a wired communicator or a wireless communicator.

5. The field ground water connectivity test device of claim 4, wherein when the communicator is a wired communicator, the communicator is connected with the flow sensor and the pressure sensor through wires, and the communicator is connected with the controller through wires.

6. The field ground water connectivity test device of claim 4, wherein when the communicator is a wireless communicator, the communicator is connected with the flow sensor and the pressure sensor through wires, and the communicator is connected with the controller through a wireless connection.

7. The field groundwater connectivity test device of claim 1, further comprising a conduit, wherein the gas pressurization mechanism, the valve, the pressure sensor, the flow sensor, the communicator, the controller, and the bubbler are all mounted or connected to the conduit.

8. A field groundwater connectivity test device according to claim 7, wherein the packer is installed below the surface of an injection well; the bubbler is mounted to the underside of the packer.

9. A field underground water connectivity test method according to any one of claims 1 to 8, wherein gas enters an aquifer from an injection well through a conduit, a valve, a pressure sensor, a flow sensor, a well cover, a packer and a bubbler, once the gas enters a monitoring well, the pressure sensor sends a corresponding pressure rise signal, the pressure rise signal is transmitted to a controller through a communicator, then the controller controls the monitoring well valve to be opened, so that the gas pressure in the well is slightly higher than the atmospheric pressure, at the moment, the pressure sensor and the flow sensor continuously communicate with the controller through the communicator for recording, and meanwhile, a gas sample is periodically taken and the content of gas components is analyzed, and the total amount of the gas in the monitoring well is indicated by combining the data signals of the pressure sensor and the flow sensor.

10. A field groundwater connectivity test method according to claim 9, wherein a plurality of monitoring wells are selected in a research area for implementing the field groundwater connectivity test method according to claim 9, when no indicating gas is detected in any of the plurality of monitoring wells, it is determined that there is no communication between groundwater in the research azimuth and the injection well, otherwise, there is communication.

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