Frequency domain electromagnetic response water tank simulation device and method for poorly-closed drill hole

Abstract

The invention relates to a frequency domain electromagnetic response water tank simulation device and method, belongs to the field of mine drilling geophysical prospecting simulation devices, and particularly relates to a frequency domain electromagnetic response water tank simulation device and method for a poor-sealing drill hole. Compared with the prior art, the frequency domain electromagnetic detection quantitative simulation device has the advantages that the blank of the frequency domain electromagnetic detection quantitative simulation device for the poorly-closed drill hole is filled, the simulation result of the frequency domain electromagnetic detection quantitative simulation device defines the frequency domain electromagnetic response characteristics of the drill hole under different parameters of the poorly-closed drill hole, and a foundation is laid for frequency domain electromagnetic evaluation and interpretation of the poorly-closed drill hole. The method can also be used for establishing an evaluation model for frequency domain electromagnetic detection of the geological environment with poor sealing of the drill hole, and is further used for quantitative evaluation and water storage capacity technologies of mine geological frequency domain electromagnetism on parameters of the poor sealing of the drill hole.

Description

Technical Field

[0001] The invention relates to a frequency domain electromagnetic response water tank simulation device and method, belongs to the field of mine borehole geophysical exploration simulation devices, and specifically relates to a frequency domain electromagnetic response water tank simulation device and method for a poorly sealed borehole. Background Art

[0002] Mine water damage is one of the main disasters that affect and threaten mine safety production. Among them, water damage in poorly sealed boreholes is an important factor causing major mine water damage accidents due to its concealment and suddenness. Since the water in poorly sealed boreholes has obvious low-resistance characteristics compared to the original strata, many projects use frequency domain electromagnetic methods that are sensitive to low-resistance bodies to detect poorly sealed boreholes, and have achieved some good results, but some detection results still get wrong conclusions. It is analyzed that when using conventional mine frequency domain electromagnetic technology to detect poorly sealed boreholes, the construction location is far away from the poorly sealed boreholes, and the frequency domain electromagnetic response is easily disturbed by the construction environment. Therefore, the borehole frequency domain electromagnetic detection technology that is closer to the location of the poorly sealed boreholes and less disturbed by the construction environment is used to detect poorly sealed boreholes, which can improve the detection accuracy to a certain extent.

[0003] However, the relationship between the position of poorly sealed boreholes and detection boreholes in mines is complex, and there is a lack of effective laboratory simulation devices. Especially when multiple poorly sealed boreholes coexist in different postures, the frequency domain electromagnetic detection response characteristics change more complex. If the relationship between the frequency domain electromagnetic detection response characteristics and the poorly sealed boreholes is not mastered, the detection accuracy will be seriously affected. At present, there are few research and designs on simulation devices for the frequency domain electromagnetic response of poorly sealed boreholes, and they are poorly consistent with the actual situation. In addition, the model does not consider the mutual influence and coupling relationship when multiple poorly sealed boreholes exist at different angles with the detection holes, which hinders the research on the frequency domain electromagnetic detection response of poorly sealed borehole parameters, and affects the detection accuracy of frequency domain electromagnetic detection of poorly sealed boreholes. Summary of the invention

[0004] The main purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a water tank simulation device and method for frequency domain electromagnetic response of poorly sealed boreholes. The device and method use a pulley assembly to place a metal rod in a conductive liquid container at different angles and orientations, and by adjusting the concentration of the water tank filling solution, simulate the influence of different bedrock conductivity on the frequency domain electromagnetic response of poorly sealed boreholes. By arranging a plurality of mutually coupled conductive metal boreholes, the frequency domain electromagnetic response characteristics of the boreholes in different groups of poorly sealed boreholes are realized, which solves the problem of quantitative simulation and measurement of the frequency domain electromagnetic response characteristics of the boreholes in different parameters of poorly sealed boreholes.

[0005] Specifically, the scheme of the present invention is:

[0006] A frequency domain electromagnetic response water tank simulation device for poorly sealed boreholes, comprising:

[0007] An electric conductive liquid container containing electric conductive liquid;

[0008] The drilling frequency domain electromagnetic simulation component comprises a detection hole arranged in the conductive liquid container, and the drilling frequency domain electromagnetic instrument is placed in the detection hole;

[0009] The badly sealed drilling assembly comprises: at least one conductive metal rod and at least one pulley assembly, wherein the conductive metal rod is connected to the pulley assembly and can be immersed in the conductive liquid at different angles to the horizontal plane under the drive of the pulley assembly.

[0010] Preferably, in the above-mentioned frequency domain electromagnetic response water tank simulation device for sealing a poorly drilled hole, the pulley assembly comprises: a slide groove, a groove pulley, a fixed pulley, a pull rope, and a hook, the slide groove is located above the conductive liquid container, the groove pulley is arranged in the slide groove, the fixed pulley is connected to the groove pulley, and the conductive metal rod is connected to the fixed pulley through a pull rope.

[0011] Preferably, in the above-mentioned frequency domain electromagnetic response water tank simulation device for sealing a poorly drilled hole, the angle between the chute and the horizontal plane is greater than zero.

[0012] Preferably, in the above-mentioned frequency domain electromagnetic response water tank simulation device for sealing a poorly drilled hole, the detection hole crosses the conductive liquid container.

[0013] A method for simulating a frequency domain electromagnetic response water tank of a poorly sealed borehole, comprising:

[0014] Placing conductive liquid in a conductive liquid container, wherein a detection hole is formed on the conductive liquid container;

[0015] placing a drilling frequency domain electromagnetic instrument in the detection hole;

[0016] A pulley assembly is arranged above the conductive liquid container, and a conductive metal rod is placed in the conductive liquid container and immersed in the conductive liquid through the pulley assembly;

[0017] Electromagnetic field signals are excited and received by the borehole frequency domain electromagnetic instrument.

[0018] Preferably, in the above-mentioned method for simulating a water tank with frequency domain electromagnetic response of a poorly sealed borehole, the pulley assembly comprises: a slideway, a groove pulley, a fixed pulley, a pull rope, and a hook;

[0019] The slide groove is arranged above the conductive liquid container, the groove pulley is arranged in the slide groove, the fixed pulley is connected to the groove pulley, and the conductive metal rod is connected to the fixed pulley through a pull rope;

[0020] The inclination angle of the conductive metal rod and the distance from the detection hole are changed by pulling the pull rope, and the azimuth angle of the conductive metal rod is adjusted by the sliding groove pulley.

[0021] Preferably, the above-mentioned method for simulating a water tank of frequency domain electromagnetic response of a poorly sealed borehole is to make conductive metal rods of different lengths, diameters, and conductivity, and place the conductive metal rods and the borehole frequency domain electromagnetic instrument in a water tank at different azimuths and inclination angles.

[0022] Therefore, the advantages of the present invention over the prior art are: the present invention fills the blank of the quantitative simulation device of frequency domain electromagnetic detection of poorly sealed boreholes, and its simulation results clarify the frequency domain electromagnetic response characteristics of boreholes under different parameters of poorly sealed boreholes, laying the foundation for the frequency domain electromagnetic evaluation and interpretation of poorly sealed boreholes. The present invention can also be used to establish an evaluation model for frequency domain electromagnetic detection of geological environments of poorly sealed boreholes, and then used for quantitative evaluation of parameters of poorly sealed boreholes and water storage technology by frequency domain electromagnetic in mine geology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the present disclosure.

[0024] Figure 1 2 is a schematic structural diagram of a frequency domain electromagnetic response water tank simulation device for sealing a poorly-sealed borehole according to an embodiment of the present invention.

[0025] Among them, 1. conductive metal rod; 2. conductive metal rod connecting hook; 3. drilling frequency domain electromagnetic instrument; 4. drilling frequency domain electromagnetic instrument detection cable; 5. drilling frequency domain electromagnetic instrument control end; 6. bracket; 7. slide groove; 8. groove pulley; 9. fixed pulley; 10. pull rope; 11. water tank; 12. device bracket; 13. device pull rope; 14. detection hole; 15. top plate.

[0026] Embodiments of the present invention will be described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] Example

[0028] The following will describe the implementation modes of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0029] like Figure 1As shown, the frequency domain electromagnetic response water tank device for poorly sealed boreholes includes a water tank 11, a poorly sealed borehole assembly, a borehole frequency domain electromagnetic simulation assembly and a detection hole 14. Among them, the water tank 11 is used to hold a solution with controllable mineralization to simulate bedrock with different conductivity; the poorly sealed borehole assembly is composed of a slide 7, a groove pulley 8, a fixed pulley 9, a pull rope 10, a conductive metal rod link hook 2 and a conductive metal rod 1, and the conductive metal rod is placed in the water tank 11 to simulate a poorly sealed borehole; the borehole frequency domain electromagnetic simulation assembly is composed of a borehole frequency domain electromagnetic instrument 3, a borehole frequency domain electromagnetic instrument detection cable 4, a borehole frequency domain electromagnetic instrument control terminal 5, a device bracket 12, and a device pull rope 13, which is used to simulate a borehole frequency domain electromagnetic instrument (usually the simulation assembly can directly select an actual borehole frequency domain electromagnetic instrument) for frequency domain electromagnetic detection of poorly sealed boreholes; the detection hole 14 is used to provide a place for the borehole frequency domain electromagnetic detection instrument to detect poorly sealed boreholes.

[0030] The water tank simulation device for the frequency domain electromagnetic response of a poorly sealed borehole adjusts the conductivity of the solution in the water tank 11 to simulate the influence of different bedrock conductivities on the frequency domain electromagnetic response of a poorly sealed borehole. The frequency domain electromagnetic response simulation of poorly sealed boreholes with different conductivities, azimuths, inclination angles, lengths and distances is achieved by adjusting the poorly sealed borehole components, thereby solving the problem of quantitative simulation and measurement of the frequency domain electromagnetic response characteristics of boreholes when multiple poorly sealed boreholes exist.

[0031] like Figure 1 As shown, the water tank 11 simulating bedrock can be a cubic water tank filled with a distilled water solution with adjustable mineralization to simulate bedrock of different conductivity. For example, a sodium chloride solution with adjustable mineralization is filled in the water tank 11, and the conductivity of the solution is equal to the conductivity of the bedrock by adjusting the concentration of sodium chloride.

[0032] The poorly sealed drilling assembly includes a top plate and two conductive metal rods, wherein the top plate is composed of a slide groove 7, a groove pulley 8, and a fixed pulley 9, and the top plate bracket 6 is fixedly connected. The top plate assembly is connected to the conductive metal rod link hook 2 through a pull rope 10. Pulling the pull rope 10 can change the inclination angle of the conductive metal rod 1 and the distance from the detection hole 14, and the sliding groove pulley 8 can adjust the azimuth angle of the conductive metal rod 1. For example, the inclination angle of the metal rod 1 can be set to "0" (horizontally placed), and it is at the same azimuth angle as the detection hole 14.

[0033] After adjusting the parameters of the conductive metal rod, when the device is used for work, firstly, the control device traction rope 13 and the instrument cable 4 are used to control the drilling frequency domain electromagnetic instrument to be located at the appropriate position of the simulated detection drilling. The drilling frequency domain electromagnetic is powered by the drilling frequency domain electromagnetic signal acquisition part 5, and the square wave current in the transmitting coil of the drilling frequency domain electromagnetic instrument excites an electromagnetic field in space, which will generate an induced current in the water tank 11 filled with sodium chloride solution in the simulated stratum where the mutually coupled conductive metal rods simulating poorly sealed drilling and the conductive metal rods 1 simulating poorly sealed drilling water are placed. The magnitude of the induced current is related to the conductivity of the conductive metal rod, the length of the conductive metal rod, the number of conductive metal rods, the diameter of the conductive metal rods, the mutual coupling mode, and the conductivity of the sodium chloride solution in the water tank. The induced current excites a secondary electromagnetic field in space, and the secondary electromagnetic field signal is detected by the receiving coil of the drilling frequency domain electromagnetic simulation component 3, and then collected and stored by the control end 5 of the drilling frequency domain electromagnetic instrument. In this way, the measurement of the drilling frequency domain electromagnetic at this position point is completed. Then, the control device traction rope 13 and the instrument cable 4 are moved to complete the frequency domain electromagnetic measurement of the borehole at different positions of the entire model, and the data is collected and stored through the drilling frequency domain electromagnetic instrument control terminal 5, thus completing the simulation of the frequency domain electromagnetic response of the borehole under a single set of poorly sealed drilling parameters.

[0034] Conductive metal rods of different lengths, diameters and electrical conductivities are made, and these conductive metal rods are placed in different numbers in a water tank 11 at different azimuths and inclination angles with the borehole frequency domain electromagnetic instrument 3 to make different water tank solution models, that is, the effects of poorly sealed boreholes of different lengths, poorly sealed boreholes of different diameters, poorly sealed boreholes filled with different mineralized waters, poorly sealed boreholes parallel to the inclination angle, intersecting poorly sealed boreholes, and different bedrock conductivities on the borehole frequency domain electromagnetic response can be simulated respectively.

[0035] The drilling frequency domain electromagnetic response water tank simulation experimental device of the present invention has a simple structure and is easy to implement. The frequency domain electromagnetic response of poorly sealed drilling holes with different conductivities can be simulated by selecting conductive metal rods with different conductive properties; the frequency domain electromagnetic response of drilling holes with poorly sealed drilling holes with different diameters can be simulated by adjusting the diameter of the conductive metal rod; the azimuth angle of the conductive metal rod is adjusted by adjusting the position of the groove pulley, and the frequency domain electromagnetic response of the drilling hole when the conductive metal rod and the detection hole are at different azimuth angles is simulated; the inclination angle of the conductive metal rod is adjusted by controlling the pull rope, and the frequency domain electromagnetic response of the drilling hole when the conductive metal rod and the detection hole are at different inclination angles is simulated; the influence of different bedrock conductivities on the frequency domain electromagnetic response of poorly sealed drilling holes can be simulated by adjusting the concentration of the water tank filling solution, and the frequency domain electromagnetic response characteristics of drilling holes when different poorly sealed drilling hole groups are realized by arranging a plurality of mutually coupled conductive metal drilling holes, thereby solving the problem of quantitative simulation and measurement of the frequency domain electromagnetic response characteristics of drilling holes when different poorly sealed drilling hole parameters are used.

[0036] The frequency domain electromagnetic response simulation device for poorly sealed boreholes described in the present invention fills the gap in the quantitative simulation device for the frequency domain electromagnetic detection of poorly sealed boreholes. Its simulation results clarify the frequency domain electromagnetic response characteristics of poorly sealed boreholes with different parameters, and lay the foundation for the evaluation and interpretation of poorly sealed boreholes by frequency domain electromagnetic detection of boreholes. It can be used to establish a frequency domain electromagnetic interpretation evaluation model for poorly sealed boreholes, and then used for quantitative evaluation of parameters of poorly sealed boreholes by mine geological frequency domain electromagnetics, water storage technology, and can also be used for calibration of numerical simulation results of borehole frequency domain electromagnetics, and teaching of the principles of borehole frequency domain electromagnetic methods.

[0037] Note that references in the specification to "one embodiment," "an embodiment," "an example embodiment," "some embodiments," etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but each embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it would be within the knowledge of a person skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments.

[0038] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A frequency domain electromagnetic response water tank simulation device for poorly sealed boreholes, characterized in that: include: An electric conductive liquid container containing electric conductive liquid; The drilling frequency domain electromagnetic simulation component comprises a detection hole arranged in the conductive liquid container, and the drilling frequency domain electromagnetic instrument is placed in the detection hole; The badly sealed drilling assembly comprises: at least one conductive metal rod and at least one pulley assembly, wherein the conductive metal rod is connected to the pulley assembly and can be immersed in the conductive liquid at different angles to the horizontal plane under the drive of the pulley assembly.

2. The frequency domain electromagnetic response water tank simulation device for poorly sealed boreholes according to claim 1 is characterized in that: The pulley assembly includes: a slide groove, a groove pulley, a fixed pulley, a pull rope, and a hook. The slide groove is located above the conductive liquid container, the groove pulley is arranged in the slide groove, the fixed pulley is connected to the groove pulley, and the conductive metal rod is connected to the fixed pulley through a pull rope.

3. The frequency domain electromagnetic response water tank simulation device for poorly sealed boreholes according to claim 2 is characterized in that: The angle between the slide groove and the horizontal plane is greater than zero.

4. The frequency domain electromagnetic response water tank simulation device for poorly sealed boreholes according to claim 1, characterized in that: The detection hole crosses the conductive liquid container.

5. A method for simulating a water tank with frequency domain electromagnetic response of a poorly sealed borehole, characterized in that: include: Placing conductive liquid in a conductive liquid container, wherein a detection hole is formed on the conductive liquid container; placing a drilling frequency domain electromagnetic instrument in the detection hole; A pulley assembly is arranged above the conductive liquid container, and a conductive metal rod is placed in the conductive liquid container and immersed in the conductive liquid through the pulley assembly; Electromagnetic field signals are excited and received by the borehole frequency domain electromagnetic instrument.

6. The method for simulating a water tank with frequency domain electromagnetic response of a poorly sealed borehole according to claim 5, characterized in that: The pulley assembly includes: a slide groove, a groove pulley, a fixed pulley, a pull rope, and a hook; The slide groove is arranged above the conductive liquid container, the groove pulley is arranged in the slide groove, the fixed pulley is connected to the groove pulley, and the conductive metal rod is connected to the fixed pulley through a pull rope; The inclination angle of the conductive metal rod and the distance from the detection hole are changed by pulling the pull rope, and the azimuth angle of the conductive metal rod is adjusted by the sliding groove pulley.

7. The method for simulating a water tank with frequency domain electromagnetic response of a poorly sealed borehole according to claim 5, characterized in that: Conductive metal rods of different lengths, diameters and conductivity are made, and the conductive metal rods and the drilling frequency domain electromagnetic instrument are placed in a water tank at different azimuths and inclination angles.

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