KR102594336B1 - Test system for tube well and method having the same - Google Patents

Abstract

The present invention relates to a well inspection system, comprising: a measuring unit introduced into the interior of the well through a cable from a cable winder; And a control unit that controls the cable winder to enable the measuring unit to measure the entire area inside the well and to derive a normal position and an abnormal position of the well, and the measuring unit is located inside the well. It is characterized by measuring generated sound waves or vibrations.

Description

Tube well inspection system and method using the same {Test system for tube well and method having the same}

The present invention relates to a well inspection system and a method using the same, and more specifically, to a well inspection system using sound waves and a method using the same.

Groundwater is water in a stagnant or flowing state caused by rainwater or snow that falls on the surface and infiltrates into the ground. It is used as a major water resource along with surface water such as river water. Recently, it has been used as emergency water or as an alternative water resource to prepare for droughts caused by climate change. The value is increasing.

In order to supply water for agricultural and industrial purposes and residential water in rural areas, a well is drilled into the ground, a casing is installed inside the well, a pumping pipe is inserted into the inside of the well through the casing, and then a pump is used to pump groundwater. The general form is to use positive numbers. Therefore, the groundwater flowing between the rock is collected in the well through the rock hole, and the groundwater collected in the well is forcibly sucked by the operation of the underwater motor pump and then supplied to the water supply pipe along the pumping pipe.

Groundwater is very useful in that safe water can be secured in a short period of time and at low cost. However, when groundwater is used in excess of what is replenished by rainwater, etc., or when pollutants infiltrate and water quality deteriorates, a long period of time and effort is required for regeneration and recovery. Therefore, in addition to preventing contamination of groundwater wells after developing groundwater, it is important to continuously manage groundwater wells to prevent water shortage problems and ensure a stable water supply.

To this end, when developing the first well, images are taken using a CCTV camera to check the stratum inside the groundwater well or the water vein from which water flows, and the saved images are used to install the internal well material (PVC or stainless steel casing pipe). It can also be used during city visits or during follow-up management. When first developing a well, video recording of the inside of the well was performed i) in a bare hole state where the well was drilled and the casing pipe (internal well material) was not installed (see Figure 1), and a camera was inserted inside the well to capture the inner surface of the well. ii) After inserting and installing the internal well material (P) into the well (see Figure 2), a camera is inserted inside the well material to take a second photo of the inner surface of the well material, and each video data is saved and used. It is done.

In other words, the conventional well inspection system and method included an inspection method using video capture such as CCTV. However, the existing proposed video recording method is based on the premise of taking video in a bare hole state when developing an underground well, and if there is no video taken in a bare hole state when developing a groundwater well or the video is lost, the inside of the groundwater well (well) There is a disadvantage in that the outside of the well material cannot be confirmed when the material is installed. In this case, even if a post-mortem video is taken of the appearance after installation of the well material, the location of the water vein layer or fractured layer (depth from which water comes out, F in Figure 1), strata, etc. in a hollow state inside the groundwater, the inside of the well and the outer surface of the well material Since the thickness of the grouting used is unknown, there are limitations in checking the location of contaminated water and taking related measures.

If groundwater quality becomes unsuitable due to the inflow of contaminants from adjacent areas, such as livestock wastewater or pesticides, after the development of a groundwater well, a method may be taken to inspect the inside of the well by lifting all the well materials inside the well to the outside. , the risk of lifting well materials is high, and groundwater wells may collapse during this process. Considering this risk, it may be possible to explore a method of drilling several holes in the longitudinal direction on the surface of the internal well material at random locations inside the groundwater well and conducting water quality tests individually at those locations, but in this case, the entire process is complicated. However, the work period takes a long time, the accuracy of identifying the location of the pollutant is low, the work cost increases excessively, and the risk burden required for water quality testing inside the well is still high.

To solve this problem, i) a well inspection method using a temperature sensor that analyzes and confirms temperature differences through temperature sensors installed at each location, and ii) a well inspection method that scans part of the well using ultrasound, etc. to check the condition inside the well. Non-destructive well inspection methods have been additionally developed and used, but these methods also have the disadvantage of only being able to check the outer shape of the well or only part of it, and furthermore, in the case of wells formed of multi-layer pipes, the inspection itself is impossible. There are fatal shortcomings.

Therefore, in the industry, continuous and active research and development are being conducted to solve the problems of the conventional well inspection method as described above and to develop a more effective well inspection method.

The present invention was created to solve the problems of the prior art as described above. The purpose of the present invention is to continuously manage the water quality of groundwater wells, while regularly inspecting the degree of contaminated water, in a simple and cost-saving manner. The purpose is to provide a possible well inspection system and a method using it.

A well inspection system according to an embodiment of the present invention includes a measuring unit that is introduced into the interior of the well through a cable from a cable winder; And a control unit that controls the cable winder to enable the measuring unit to measure the entire area inside the well and to derive a normal position and an abnormal position of the well, and the measuring unit is located inside the well. It is characterized by measuring generated sound waves or vibrations.

Specifically, the control unit includes an analysis unit that analyzes the sound wave or vibration data received from the measurement unit through frequency analysis to derive the normal position and abnormal position of the well, and the analysis unit, After decomposing the sound wave or vibration data into unit frequencies and indicating the amplitude at that frequency, when a specific frequency whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value occurs, the location where the sound wave or vibration data was measured is determined. It may include a first analysis mode that analyzes to derive an abnormal position of the well.

Specifically, the analysis unit further includes a second analysis mode that analyzes to verify the accuracy of deriving the abnormal location of the well in the first analysis mode when there is sound wave or vibration data measured in the well in a normal state. And, the second analysis mode defines the range of amplitude derived from sound wave or vibration data measured in a well in a steady state as the normal region, and the amplitude at a specific frequency of the first analysis mode derived is the normal region. If a deviation occurs, it can be verified by the abnormal position of the well.

Specifically, the control unit further includes an external force generator that forcibly generates sound waves or vibrations in the well, and the external force generator may be activated when the measuring unit is injected into surface water of the well.

Specifically, the external force generator may directly or indirectly supply sound waves or vibrations to a pipe formed in the well from the ground outside the well.

Specifically, the pipe is a double pipe including a primary pipe formed on the outside and a secondary pipe formed on the inside, the measuring unit is input into the secondary pipe, and the external force generating unit is connected to the primary pipe. Sound waves or vibrations can be supplied directly or indirectly to the pipe.

In addition, a well inspection method according to an embodiment of the present invention includes the steps of injecting a measuring unit into the interior of the well through a cable of a cable winder; Measuring sound waves or vibrations generated inside the well for a preset unit time at a preset unit location with a measuring unit; and a step where the analysis unit receives sound wave or vibration data from the measurement unit and then derives the normal position and abnormal position of the well using a frequency analysis method.

Specifically, the step of deriving the normal position and abnormal position of the well is to decompose the sound wave or vibration data into unit frequencies to indicate the amplitude at that frequency, and then to show the amplitude at a preset value or more than the amplitude of the surrounding frequency. Analyzing the location where the sound wave or vibration data was measured to derive an abnormal location of the well when a specific frequency occurs; And if there is data on sound waves or vibrations measured in a well in a normal state, the range of amplitude derived from the data is defined as the normal region, and if the amplitude at a specific frequency deviates from the normal region, an abnormality in the well occurs. It may include a verification step by location.

Specifically, the step of injecting the well into the well may include the step of forcibly generating sound waves or vibrations in the well by operating the external force generator when inserting the measuring unit after surface water formed inside the well.

Specifically, the step of inserting the measuring unit into the secondary pipe of the double pipe of the well; And when the measuring unit is introduced after surface water formed inside the well, the external force generator may forcibly generate a sound wave or vibration in the primary pipe of the double pipe.

The well inspection system and method using the same according to an embodiment of the present invention have the effect of quickly and easily measuring the entire well as a whole for abnormalities not only on the outside but also on the inside of the well by inspecting the well using sound waves.

In addition, the well inspection system and method using the same according to an embodiment of the present invention have the advantage of being able to inspect all pipe layers of the well even if it is composed of multiple layers of pipes by inspecting the well using sound waves.

In addition, the well inspection system and method using the same according to an embodiment of the present invention inspect the well using sound waves, so that contaminated water can be removed without lifting the pipe installed inside the well to the outside or performing local drilling work on the pipe. It is possible to identify the location of occurrence, which has the effect of simplifying and reducing costs.

Accordingly, the well inspection system and method using the same according to an embodiment of the present invention are effective in continuously managing the water quality of groundwater wells and regularly inspecting the degree of contamination of contaminated water.

The effects that can be obtained from the disclosed embodiments are not limited to the effects mentioned above, and other effects not mentioned will be clearly apparent to those skilled in the art to which the disclosed embodiments belong from the description below. It will be understandable.

Figure 1 is a conceptual diagram of the open state of an underground water well constructed below the ground.
Figure 2 is a conceptual diagram after the well material is inserted into the groundwater well.
Figure 3 is a conceptual diagram showing a state in which the well inspection system according to an embodiment of the present invention is inserted into an underground water well.
Figure 4 is a graph derived when operating in the first analysis mode in the well inspection system according to an embodiment of the present invention.
Figure 5 is a graph derived when operating in the second analysis mode in the well inspection system according to an embodiment of the present invention.
Figure 6 is a flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.
Figure 7 is a first partial flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.
Figure 8 is a second partial flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when adding reference numbers to components in each drawing, it should be noted that identical components are given the same number as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In the present invention, the well (H) is generally formed in a structure in which the vertical depth is considerably longer than the diameter of the well (H) because the actual depth is more than 100 meters, but the groundwater well (H) shown in Figures 1 to 3 is For convenience, the vertical length is expressed as short.

The detailed description below will be described in detail together with the drawings shown below.

Figure 1 is a conceptual diagram of a bare hole state of a groundwater well constructed below the ground, and Figure 2 is a conceptual diagram after well materials are inserted into the groundwater well.

Before explaining the well inspection system 1 according to an embodiment of the present invention, the well H will be briefly described.

The groundwater well (H) is formed by excavating below the ground (G) using equipment such as a driller and compressor, as shown in Figure 1, and the depth of the well (H) varies depending on the small hole, hollow hole, and large hole. However, in some cases, the excavation ranges from a minimum of 20 m to a maximum of 500 m or more. Inside the excavated well (H), groundwater flowing in through the fractured layer (D) connected to the groundwater vein collects, and the natural water level (E) of groundwater is formed at a certain depth inside the well (H).

As shown in FIG. 2, a pipe (P) made of PVC or stainless steel is inserted into this hollow well as an internal well material, and a plurality of pipes (P) are connected to the socket portion (P) to correspond to the internal depth of the well (H). It is connected by F1), and groundwater flowing in from the water vein layer of the well (H) is introduced into the pipe (P) through the perforated part (F2) so that the natural water level (E) is established inside the pipe (P). .

If there are livestock farms, farms, or factories near the groundwater well (H), livestock waste, pesticides, factory wastewater, etc. may flow in. In particular, if the sumgol, which is the passage through which rainwater enters the underground, is connected to the water vein layer, the groundwater in the well (H) can be easily contaminated.

However, it is quite difficult to check from which water vein layer contaminated water is flowing inside a well (H) deeper than 100 meters, and water quality management of the groundwater well (H) is impossible due to the lack of a proper inspection device, and the water quality of the well (H) is contaminated. ) has no choice but to leave it as is or dispose of it.

In order to solve this problem, non-destructive analysis techniques such as imaging analysis techniques, temperature difference analysis techniques, and ultrasonic waves have been additionally developed and used. However, these methods also have the disadvantage of only being able to confirm the external appearance of the well or only part of it. Moreover, in the case of wells formed of multi-layer pipes, there are fatal disadvantages in which inspection itself is impossible.

Accordingly, the present applicant developed a well inspection system (1) according to an embodiment of the present invention as follows in order to solve the problems of the prior art as described above.

Figure 3 is a conceptual diagram showing a state in which the well inspection system according to an embodiment of the present invention is inserted into an underground water well.

As shown in Figure 3, the well inspection system 1 according to an embodiment of the present invention includes a measuring unit 10, a cable winder 20, a control unit 30, and an external force generating unit 40. .

Hereinafter, the well inspection system 1 according to an embodiment of the present invention will be described in detail.

The measuring unit 10 is introduced into the inside of the well (H) through the cable (L) from the cable winder 20, and measures sound waves or vibrations generated inside the well (H). Specifically, the measuring unit 10 can measure sound waves or vibrations generated in the pipe P of the well H, and the measured sound waves or vibration data can be transmitted to the control unit 30, which will be described later.

In this way, the well inspection system 1 according to an embodiment of the present invention has the effect of being able to quickly and easily measure the entire well as a whole for abnormalities not only on the outside but also on the inside of the well by inspecting the well (H) using sound waves. It has the advantage of being able to inspect all pipe layers of a well even in a well made up of multiple layers of pipes.

The measuring unit 10 moves up and down to the lower part of the well (H) or the upper part of the well (H) through the cable winder (20) and may be placed at a specific location inside the well (H).

The measuring unit 10 may have an external housing (not shown) made of a waterproof and dustproof material to protect the built-in devices from surface water (W) or flying dust, and can sufficiently withstand the pressure of surface water (W). It can be configured in any thickness and shape. The external housing is, for example, formed as a cylindrical structure with a length of about 30 to 50 cm and a diameter of about 10 cm, and may be made of a metal material that can withstand water pressure, but is not limited thereto.

The measuring unit 10 includes an electronic device unit (not shown) consisting of a circuit for electrical and electronic operations necessary to measure sound waves or vibrations and collect and receive the measured data, and the measuring unit 10 includes surface water ( W) When located outside, a sound wave generator (not shown) configured to forcibly transmit sound waves to the well (H) may be included. Before the measuring unit 10 is input into the surface water (W) of the well (H), the sound wave generator is operated to generate the sound waves necessary for measurement, and the measuring unit 10 is input into the surface water (W) of the well (H). When inputting, the external force generator 40, which will be described later, operates to generate sound waves necessary for measurement.

The electronic device unit may be in the form of a microphone, for example, and is built inside the external housing of the measuring unit 10, and the sound wave generator may be formed outside the external housing of the measuring unit 10. At this time, the sound wave generator may stop operating when the measurement unit 10 is injected into the surface water (W) of the well (H).

A plurality of electronic device units may be installed radially in all directions of 360 degrees so that the measuring unit 10 can measure sound waves or vibrations in all directions inside the well (H).

The cable winder 20 is installed outside the well (H) and is configured to be connected to the measuring unit 10 through a cable (L) and a pulley (not shown), and by unwinding the cable (L) and unwinding the pulley. Then, the measuring part 10 is inserted in the depth direction inside the well (H) to go down to the bottom of the well (H), and when the cable (L) is wound, the measuring part (10) is brought up to the top of the well (H). can do.

The cable winder 20 may include a distance totalizer (not shown) that calculates the insertion depth of the measuring unit 10 by measuring the unwound or wound length of the cable L. Through the distance totalizer, the measuring unit 10 can be positioned at a preset unit position inside the well (H) for a preset unit time. Here, the preset unit position may be, for example, 5 m, and the preset unit time may be, for example, 5 minutes.

For example, the cable (L) may be made of a waterproof material with an outer diameter of about 5 to 10 mm, and has a metal wire inside to support its own weight, and the sound wave or sound measured in the measuring unit 10 A wire cable for transmitting vibration data or receiving instruction information from the control unit 30 may be built in. When the control unit 30 and the measurement unit 10 are connected wirelessly, the wire cable can be removed from the cable (L).

The control unit 30 controls the cable winder 20 to enable the measuring unit 10 to measure the entire interior area of the well H and to derive the normal and abnormal positions of the well H. Control. Here, the abnormal position refers to a position on the pipe (P) where cracks, etc. are formed in the pipe (P), making it impossible for normal components to function.

The control unit 30 may be composed of a winder control unit 31, an analysis unit 32, and an external force generator control unit 33, and a measurement unit 10, a cable winder 20, and an external force generator 40. ) is connected by wire or wirelessly, through which measurement information such as data can be received and instruction information can be transmitted to each component. Typically, as the depth of the well (H) ranges from tens of meters to hundreds of meters, when the insertion depth of the measuring unit (10) increases, signal cable resistance occurs due to an increase in the length of the cable (L) when connected by wire, and when connected wirelessly, radio waves occur. Since radio wave energy loss occurs due to spatial obstacles, a signal amplifier capable of compensating for this may be included in the control unit 30.

The winder control unit 31 is configured to control the operation of the cable winder 20 and can control the unwinding or pulling of the cable L of the cable winder 20.

The winder control unit 31 can unwind or pull the cable (L) so that the measuring unit 10 can be positioned at a preset unit position inside the well (H), for example, in units of 5 m, and can be positioned at that position in unit time. It can be controlled to be positioned for, for example, 5 minutes.

The analysis unit 32 analyzes the sound wave or vibration data received from the measurement unit 10 through frequency analysis to derive the normal and abnormal positions of the well H. .

The analysis unit 32 decomposes the sound wave or vibration data into unit frequencies and displays the amplitude at that frequency, and then, when a specific frequency whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value occurs, the sound wave or vibration data A first analysis mode that analyzes the measured position to derive the ideal position of the well (H), and when there is sound wave or vibration data measured in the well (H) in a normal state, the well (H) in the first analysis mode It may include a second analysis mode that analyzes to verify the accuracy of deriving the abnormal location.

The first analysis mode will be examined with reference to FIG. 4. Figure 4 is a graph derived when operating in the first analysis mode in the well inspection system according to an embodiment of the present invention.

Figure 4 shows sound wave or vibration data measured where the measuring unit 10 is located at a preset unit position inside the well (H), for example, 5 m below the ground. In 4, the horizontal axis represents frequencies expressed by decomposing sound wave or vibration data into unit frequencies. In Figure 4, the vertical axis represents the amplitude at the corresponding frequency.

In the first analysis mode, the sound wave or vibration data introduced through the measuring unit 10 is converted into individual spectral components through Fast Fourier Transform (FFT), and the sound wave or vibration data is divided into frequency and vibration data, respectively. It provides corresponding amplitude information.

In the first analysis mode, when the frequency and corresponding amplitude information provided in this way are plotted on the horizontal and vertical axes as shown in FIG. 4, the portion where there is a difference such as the amplitude of a specific frequency being higher or lower than the amplitude of the surrounding frequency by a preset value or more. (B; abnormal frequency) occurs, and in this case, the location where the sound wave or vibration data is measured can be analyzed to derive the abnormal location of the well (H). If there is no difference at the measured location, such as the amplitude of a specific frequency being higher or lower than the amplitude of surrounding frequencies by more than a preset value, the location where the sound wave or vibration data was measured is derived as the normal location. It can be analyzed as much as possible.

Through this, the well inspection system 1 according to an embodiment of the present invention has the effect of deriving an abnormal position even without sound wave or vibration data measured in the well H in a normal state.

The second analysis mode defines the amplitude derived from the sound wave or vibration data measured in the well (H) in a steady state as the normal region (C), and the normal region (C) among the amplitudes at a specific frequency in the first analysis mode If a deviation occurs, it can be verified by the abnormal position of the well (H).

Specifically, for the second analysis mode, Figure 5 is a graph derived when operating in the second analysis mode in the well inspection system according to an embodiment of the present invention.

In Figure 5 (a), the sound wave or vibration data measured in the well (H) in a steady state is converted into individual spectral components through fast Fourier transform (FFT), and the sound wave or vibration data are divided into frequencies and corresponding values, respectively. It is a graph providing amplitude information, and (b) is a graph showing the frequency and corresponding amplitude information shown in the first analysis mode, that is, the data of sound waves or vibrations measured in the current state are converted into individual spectral components through fast Fourier transform (FFT). This is a graph that provides frequency and corresponding amplitude information for sound wave or vibration data, respectively.

Figure 5 shows the normal state (FIG. 5(a)) and the current state where the measuring unit 10 is located at a preset unit position inside the well (H), for example, 5 m below the ground. (FIG. 5(b)) shows the measured sound wave or vibration data, and the horizontal axis shows the frequencies expressed by decomposing the sound wave or vibration data into unit frequencies. In Figure 5, the vertical axis represents the amplitude at the corresponding frequency.

In the second analysis mode, when the frequency and corresponding amplitude information provided from the well in a steady state are plotted on the horizontal and vertical axes as shown in (a) of Figure 5, all frequencies are shown within a predetermined amplitude region, and this amplitude region portion is This is called the normal region (C). Next, the frequency and corresponding amplitude information shown in the first analysis mode are plotted on the horizontal and vertical axes as shown in (b) of Figure 5, and the normal region (C) derived in (a) of Figure 5 is added and compared. Looking at this, when the amplitude at a specific frequency in the first analysis mode deviates from the normal region (C) (when an abnormal frequency (B) occurs), this location where the sound wave or vibration data was measured is located at the well (H ) can be verified by the abnormal location. Here, frequencies existing within the normal region (C) can be defined as normal frequencies (A).

Through this, the well inspection system 1 according to an embodiment of the present invention detects the abnormal position derived in the first analysis mode once when there is sound wave or vibration data measured in the well H in a normal state. This has the effect of increasing accuracy by allowing more verification.

The external force generator control unit 33 is configured to control the operation of the external force generator 40, and can be controlled to operate when the measurement unit 10 is input into the surface water (W) of the well (H). For this purpose, a water pressure measuring device (not shown) is installed on the lower side of the measuring unit 10, and the moment the measuring unit 10 is put into the surface water (W), it transmits a signal to the external force generator control unit 33 to generate external force. The generator control unit 33 is controlled to operate the external force generator 40.

The external force generator 40 forcibly generates sound waves or vibrations in the well (H), and can be operated when the measuring unit 10 is input into the surface water (W) of the well (H).

The external force generator 40 may directly or indirectly supply sound waves or vibrations to the pipe P formed on the ground G outside the well H. Here, the pipe (P) may be a double pipe including a primary pipe (P1) formed on the outside and a secondary pipe (P2) formed on the inside. At this time, the measuring unit 10 is input into the secondary pipe (P2), and when the measuring unit 10 attempts to measure the abnormal position of the primary pipe (P1), the external force generating unit 40 is inserted into the primary pipe (P1). ) can supply sound waves or vibration directly or indirectly. Of course, the external force generator 40 is operated only after the measurement unit 10 is introduced into the surface water (W), but in the case of a double pipe (P), it can be operated from the beginning of measurement.

In the case of existing well inspection systems such as video shooting analysis techniques, temperature difference analysis techniques, and non-destructive analysis techniques using ultrasound, etc., only the area directly facing the measurement part was possible to measure, so if the interior is formed with a multi-layered pipe, the outermost area is used. It was difficult to measure the abnormal location of the pipe.

In order to solve these shortcomings, the well inspection system 1 according to an embodiment of the present invention has the advantage of being able to inspect all pipe layers of the well even in a well made up of multi-layer pipes by inspecting the well using sound waves. there is. That is, as described above, when measuring the abnormal position of the primary pipe (P1), which is the outermost pipe in the double pipe (P), sound waves or vibration are applied to the primary pipe (P1) by the external force generator 40. By supplying directly or indirectly, the abnormal position of the primary pipe (P1) can be searched for by sound waves or vibration.

The external force generator 40 may be a hydraulically driven sound wave or vibration generator, and, for example, may be implemented manually by a worker using a tool such as a hammer.

The well inspection method of the well inspection system 1 according to an embodiment of the present invention described above will be described in detail below with reference to FIGS. 6 to 8.

Figure 6 is a flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.

The well inspection method using the well inspection system according to the embodiment of the present invention can be implemented by the well inspection system 1 according to the embodiment described above. Hereinafter, the well inspection method using the well inspection system 1 is described below. Let me explain each step.

As shown in Figure 6, the well inspection method using the well inspection system according to an embodiment of the present invention includes the step of injecting the measuring unit into the interior of the well through the cable of the cable winder (S10), and the unit position preset to the measuring unit. In the step (S20) of measuring sound waves or vibrations generated inside the well for a preset unit time, and after the analysis unit receives the sound wave or vibration data from the measurement unit, the normal and abnormal positions of the well are determined using the frequency analysis method. It includes an analysis step (S30) to derive it.

In step S10, the measuring unit is introduced into the interior of the well through the cable of the cable winder.

A double pipe (P) consisting of a primary pipe (P1) and a secondary pipe (P2) is installed in the well (H), and the cable (L) of the cable winder (20) is measured through the control unit (30). The unit (10) is inserted into the double pipe (P).

At this time, the measuring unit 10 can generate sound waves from the ground (G) to the surface water (W) through the sound wave generator. Of course, if the noise or vibration generated from the pipe (P) of the well (H) is weak, even before the surface water (W) is input, the external force generator 40 is operated to generate noise or vibration through the pipe (P) of the well (H). Vibration can be supplied.

Step S10 is performed when 1) the measuring unit 10 is input into the surface water (W) when it is inserted into the well through the cable winder 20, and 2) the pipe (P) of the well (H) is a double pipe. In some cases, the following steps may be further included.

When the measuring part is introduced after surface water formed inside the well through a cable winder, although not shown in the drawing, a step of injecting the measuring part into the inside of the well through the cable of the cable winder according to an embodiment of the present invention (S10) may include a step (not shown) of forcibly generating sound waves or vibrations in the well by operating the external force generator.

This additional step operates the external force generator when the measuring unit is introduced after the surface water formed inside the well through a cable winder to forcibly generate sound waves or vibrations in the well.

When the measuring unit 10 touches the surface water (W), the water pressure measuring device installed on the lower side of the measuring unit 10 recognizes the fact that the measuring unit 10 is input into the surface water (W), and at this time, the external force generating unit The external force generator 40 is operated by the control unit 33 to forcibly generate sound waves or vibrations through the pipe P formed inside the well H.

In addition, when the pipe installed in the well is a double pipe, the step (S10) of injecting the measuring unit into the well through the cable of the cable winder according to the embodiment of the present invention further includes the following detailed steps. can do.

Figure 7 is a first partial flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.

As shown in Figure 7, the step (S10) of inserting the measuring unit into the interior of the well through the cable of the cable winder according to the embodiment of the present invention involves inserting the measuring unit into the secondary pipe of the double pipe of the well. It may include a step (S11) and a step (S12) in which the external force generator forcibly generates a sound wave or vibration in the primary pipe of the double pipe when the measuring unit is introduced after the surface water formed inside the well.

Step S11 inserts the measuring unit into the secondary pipe of the double pipe of the well.

The measuring unit 10 is introduced into the secondary pipe (P2) through the cable winder 20. At this time, the sound wave generator formed within the measuring unit 10 can be operated until it is introduced into the surface water (W). However, if the signal is weak, the signal can be amplified by operating the external force generator 40. You can.

In step S12, when the measuring unit is introduced after the surface water formed inside the well, the external force generator forcibly generates a sound wave or vibration in the primary pipe of the double pipe.

When the measuring unit 10 touches the surface water (W), the water pressure measuring device installed on the lower side of the measuring unit 10 recognizes the fact that the measuring unit 10 is input into the surface water (W), and at this time, the external force generating unit The external force generator 40 is operated by the control unit 33 to forcibly generate sound waves or vibrations in the primary pipe (P1) formed inside the well (H).

In step S20, the measurement unit measures sound waves or vibrations generated inside the well at a preset unit position and for a preset unit time.

When the measuring part 10 moves downward into the well (H), the measuring part 10 is moved downward from the ground (G) at unit positions of 5 m through the distance totalizer included in the cable winder 20. It is made to go down, and after reaching the unit position, it is asked to stay there for a unit time, for example 5 minutes.

In step S30, the analysis unit receives sound wave or vibration data from the measurement unit and analyzes it to derive the normal and abnormal positions of the well using a frequency analysis method.

The analysis unit 32 can receive sound wave or vibration data from the measurement unit 10 wired or wirelessly through a cable (L), and then analyzes it through frequency analysis (Frequency Analysis). ) so that the normal and abnormal positions are derived.

The frequency analysis method converts the sound wave or vibration data introduced through the measuring unit 10 into individual spectral components through Fast Fourier Transform (FFT), and determines the frequency and corresponding Provides amplitude information.

Step S30 is a step in which the analysis unit, which receives sound wave or vibration data from the measurement unit, derives the normal position and abnormal position of the well, and may further include the following detailed steps.

Figure 8 is a second partial flowchart of a well inspection method using a well inspection system according to an embodiment of the present invention.

As shown in Figure 8, the analysis unit according to an embodiment of the present invention receives sound wave or vibration data from the measurement unit and then analyzes it to derive the normal position and abnormal position of the well using a frequency analysis method (S30). After decomposing the sound wave or vibration data into unit frequencies and displaying the amplitude at that frequency, when a specific frequency occurs whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value, the location where this sound wave or vibration data was measured Analyzing to derive the abnormal position of the well (S31; first analysis mode), and if there is sound wave or vibration data measured in the well in a normal state, defining the range of amplitude derived from the data as the normal area, When the amplitude at a specific frequency deviates from the normal range, a step of verifying the abnormal position of the well (S32; second analysis mode) is included.

In step S31, the sound wave or vibration data is decomposed into unit frequencies and the amplitude is displayed at that frequency. When a specific frequency whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value occurs, the sound wave or vibration data is measured. The location is analyzed to derive the ideal location of the well.

Through this, the well inspection method according to an embodiment of the present invention has the effect of deriving an abnormal location even without sound wave or vibration data measured in the well (H) in a normal state.

Step S32 defines the range of amplitude derived from the data as the normal region when there is sound wave or vibration data measured in a well in a steady state, and when the amplitude at a specific frequency deviates from the normal region, the well is Verify with the abnormal position.

This step S32 is performed after step S31, and may not be performed if there is no existing sound wave or vibration data measured in the well (H) in a steady state.

After defining the range of amplitude derived from the sound wave or vibration data measured in the well in a steady state as the normal area (C), the normal area (C) is overlaid on the data derived in step S31 to obtain the normal area (C) derived in step S31. If the amplitude at a specific frequency deviates from the normal range, final verification is completed based on the abnormal location of the well.

Through this, the well inspection method according to an embodiment of the present invention can increase accuracy by verifying the location of the abnormality once more when there is sound wave or vibration data measured in the well (H) in a normal state. There is an effect.

In summary, the well inspection system (1) according to an embodiment of the present invention and the method using the same inspect the well (H) using sound waves, so that the presence or absence of abnormalities not only on the outside but also on the inside of the well can be quickly and thoroughly checked throughout the well. It has the effect of being easily measurable, and also has the advantage of being able to inspect all pipe layers of a well, even in a well made up of multiple layers of pipes.

In addition, the well inspection system (1) and the method using the same according to an embodiment of the present invention inspect the well using sound waves, so that the pipe (P) installed inside the well (H) is lifted to the outside or the pipe ( It is possible to identify the location of contaminated water without having to perform local drilling work on P), which has the effect of simplifying and reducing costs. Accordingly, it is possible to continuously manage the water quality of groundwater wells, but it is also effective in regularly inspecting the level of contaminated water.

Although the present invention has been described in detail through specific examples, this is for the purpose of specifically explaining the present invention, and the present invention is not limited thereto, and can be understood by those skilled in the art within the technical spirit of the present invention. It would be clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Well inspection system 10: Measurement unit
20: cable winder 30: control unit
31: winder control unit 32: analysis unit
33: External force generator control unit 40: External force generator
H: Well G: Ground
W: Surface water P: Double pipe
P1: Primary pipe P2: Secondary pipe
A: Normal frequency B: Abnormal frequency
C: Normal area D: Fractured layer
E: Natural water level F1: Connection socket part
F2: Perforated part L: Cable

Claims (10)

A measuring unit that is introduced into the interior of the well through a cable from the cable winder; and
A control unit that controls the cable winder to enable the measuring unit to measure the entire interior area of the well and to derive the normal and abnormal positions of the well,
The measuring unit,
Measure sound waves or vibrations generated inside the well,
The control unit,
An analysis unit that analyzes the sound wave or vibration data received from the measurement unit through frequency analysis to derive the normal position and abnormal position of the well,
The analysis unit,
After decomposing the sound wave or vibration data into unit frequencies and indicating the amplitude at that frequency, when a specific frequency occurs whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value, the location where the sound wave or vibration data was measured It includes a first analysis mode that analyzes to derive the abnormal position of the well,
When there is sound wave or vibration data measured in a well in a steady state, it further includes a second analysis mode for analyzing the accuracy of deriving the abnormal position of the well in the first analysis mode,
The second analysis mode is,
The range of amplitude derived from sound wave or vibration data measured in a well in a steady state is defined as a normal region, and when the amplitude at a specific frequency of the first analysis mode derived deviates from the normal region, the well is A well inspection system characterized by verification by an abnormal position of.
delete delete According to claim 1,
It further includes an external force generator that forcibly generates sound waves or vibrations in the well,
The external force generator,
A well inspection system, characterized in that the measuring unit is operated when the measuring unit is input into the surface water of the well.
The method of claim 4, wherein the external force generator,
A well inspection system characterized in that sound waves or vibrations are directly or indirectly supplied to a pipe formed in the well from the ground outside the well.
The method of claim 5, wherein the pipe:
It is a double pipe including a primary pipe formed on the outside and a secondary pipe formed on the inside,
The measuring unit is input into the secondary pipe,
The external force generator is a well inspection system characterized in that it directly or indirectly supplies sound waves or vibrations to the primary pipe.
In the well inspection method using the well inspection system of any one of claims 1 and 4 to 6,
Injecting the measuring unit into the interior of the well through the cable of the cable winder;
Measuring sound waves or vibrations generated inside the well for a preset unit time at a preset unit location with a measuring unit; and
A well inspection method comprising the step of deriving the normal position and abnormal position of the well using a frequency analysis method after the analysis unit receives sound wave or vibration data from the measurement unit.
The method of claim 7, wherein the step of deriving the normal position and abnormal position of the well is,
After decomposing the sound wave or vibration data into unit frequencies and indicating the amplitude at that frequency, when a specific frequency occurs whose amplitude is different from the amplitude of the surrounding frequency by more than a preset value, the location where the sound wave or vibration data was measured is determined. Analyzing to derive an ideal location of; and
If there is sound wave or vibration data measured from a well in a normal state, the range of amplitude derived from the data is defined as the normal region, and if the amplitude at a specific frequency deviates from the normal region, the abnormal location of the well A well inspection method comprising the step of verifying.
The method of claim 7, wherein the step of injecting into the well is,
A well inspection method comprising the step of activating an external force generator to forcibly generate sound waves or vibrations in the well when the measuring unit is introduced after surface water formed inside the well.
According to clause 9,
Inserting the measuring unit into the secondary pipe of the double pipe of the well; and
A well inspection method comprising the step of forcing the external force generator to generate a sound wave or vibration in the primary pipe of the double pipe when the measuring unit is introduced after surface water formed inside the well.

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