Waterfissure zone monitoring system and method based on electrical signals

Abstract

The application discloses a water conducting fractured zone monitoring system and method based on electric signals, which realizes the discharge of electrolyte liquid at different positions by setting a fixed guide rod to control the sliding of a water plugging air bag along a drill rod. A guide wire is arranged in the inside of a parallel drill rod and is connected with two metal plates with different activity degrees, and a feedback system is formed by a variable resistor, a universal meter and the like. When the parallel drill hole is located in a water conducting fractured zone development area, the electrolyte liquid will leak at the drill hole A and flow into the drill hole B along the horizontal fracture. When the metal plate in the parallel drill hole B is affected by the electrolyte liquid, the transfer of electrons will occur and an electric signal is fed back to the universal meter. The system has the characteristics of high economic effect, simple and accurate operation, and can realize the through condition measurement of a certain water conducting fractured zone development area without withdrawing the drill rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring systems, in particular to a water flowing fractured zone monitoring system and method based on electric signals. BACKGROUND

[0002] Due to mining disturbance and tectonic stress, a large number of mining fractures are often generated in a certain area during coal mining, which are easy to form water flowing channels and establish contact with water sources, thereby threatening the safety of mine production, so it is of great significance to accurately monitor the development height of water flowing fractured zone. In actual engineering application, a double-end water plugging device combined with a water pressure measuring table is often used to detect the height of water flowing fractured zone, that is, the water plugging air bag is inflated to adhere to the wall surface, and then water is injected into the double-end water plugging device to measure the water pressure to determine the development height of water flowing fractured zone. However, this method has some limitations. First, this monitoring system cannot achieve the purpose of real-time judgment of the position of water flowing fractured zone, and the drill rod needs to be withdrawn while measuring during operation, which is complicated and may cause hole collapse when withdrawing the rod. Second, when the water flowing fractured zone development is not obvious, the water injection loss is small, and the water flowing fractured zone development condition can only be judged by water flow, which is not accurate enough. The water injection method can only explain the development height of water flowing fractured zone in the vertical direction, but cannot detect the penetration of fractures in the horizontal direction, and lacks a method for detecting the development of fractured zone. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a water flowing fractured zone monitoring system based on electric signals, which has a wide range of applications, accurate measurement results, and can avoid the problem of hole collapse caused by frequent rod withdrawal.

[0004] To solve the above technical problems, the technical solution adopted by the present application is: a water flowing fractured zone monitoring system based on electric signals, characterized by: two parallel drill holes A2 and a drill hole B3 located in the water flowing fractured zone, a drill bit and a drill rod connected with the drill bit are arranged in each drill hole, a first double-end water plugging air bag is arranged on the outer side of the first drill rod located in the drill hole A2, a water outlet hole is arranged on the first drill rod between the first double-end water plugging air bags, a first fixed guide rod is arranged on the outer side of the first drill rod, the upper end of the first fixed guide rod is connected with the first double-end water plugging air bag, for driving the first double-end water plugging air bag to move up and down along the outer periphery of the first drill rod, the upper end of the first gas pressure resistant pipe is in communication with the first double-end water plugging air bag, for inflating the first double-end water plugging air bag;

[0005] The outer side of the second drill rod located in the borehole B3 is provided with a second double-end water plugging air bag, a plurality of water inlet holes are arranged on the second drill rod between the second double-end water plugging air bag, the outer side of the second drill rod is provided with a second fixed guide rod, the upper end of the second fixed guide rod is connected with the second double-end water plugging air bag, and the second fixed guide rod is used for driving the second double-end water plugging air bag to move up and down along the outer periphery of the second drill rod, the upper end of the second gas pressure resistant pipe is communicated with the second double-end water plugging air bag, and the second double-end water plugging air bag is used for inflating the second double-end water plugging air bag; the first plugging is arranged in the second drill rod, the first metal plate, the second metal plate and the cleaning nozzle are fixed on the first plugging, the first metal plate is connected with one input end of the universal meter through a wire, the other input end of the universal meter is connected with the second metal plate through a potential transformer and a wire, and the activity of the first metal plate is different from that of the second metal plate. When the two contact the electrolyte liquid, a potential difference can be generated between the two.

[0006] Further technical solutions are that the first drill rod is provided with a second plugging, the first pressure resistant water pipe passes through the second plugging, and the first pressure resistant water pipe provides the electrolyte liquid into the space between the first double-end water plugging air bag in a pressurized manner.

[0007] Preferably, the water inlet holes are provided with five circles, and the distance between each circle of water inlet holes is 1 m.

[0008] Further technical solutions are that the cleaning nozzle is connected with the second pressure resistant water pipe, and the second pressure resistant water pipe is used for providing cleaning water for the cleaning nozzle.

[0009] The application further discloses a water conducting fractured zone monitoring method based on an electric signal, and the method uses the monitoring system.

[0010] Step S1: two parallel boreholes A2 and a borehole B3 are drilled in a water conducting fractured zone 1 to be measured.

[0011] Step S2: before measurement, the first double-end water plugging air bag 4 is moved to a to-be-measured position through the first fixed guide rod, the first pressure resistant air pipe is used for inflating the first double-end water plugging air bag 4, the first double-end water plugging air bag 4 is adhered to the hole wall, and the loss of the electrolyte liquid is avoided.

[0012] Step S3: The electrolyte solution is delivered through the first pressure-resistant water pipe and discharged into the space between the first double-end water-blocking air bag and the borehole A2. According to the practical experience, the water injection amount per minute per meter of hole section in the water-conducting fracture development area is between 6 L / min and 30 L / min under the water injection pressure of 0.2 MPa, which can be used as a basis to determine whether it is in the water-conducting zone. If the water injection amount is higher than 30 L / min, it indicates that the position to be measured is in the caving zone. If it is lower than 6 L / min, it indicates that the position to be measured is higher than the top end of the water-conducting fracture zone, and the first double-end water-blocking air bag needs to be deflated to discharge the liquid and lower the height to be measured through the sliding sheet.

[0013] Step S4: After the water-conducting zone of the borehole A2 is determined, the horizontal fracture development detection operation can be started. First, a lively first metal plate and an unreactive second metal plate are loaded into the second drill rod, and a complete test circuit is formed by connecting the universal meter and the potentiometer through the wires. The second double-end water-blocking air bag is placed on both sides of a circle of water inlet holes. If the area between the second double-end water-blocking air bags is conducted by horizontal fractures, the electrolyte solution will flow from the water outlet position of the borehole A2 into the second double-end water-blocking air bags, and then flow into the drill rod through the water inlet holes between the second double-end water-blocking air bags. The electrolyte solution is intercepted by the first seal, and the electrolyte solution contacts the first metal plate and the second metal plate on the first seal. Under the action of the electrolyte solution, electron transfer occurs between the two metal plates. At this time, the area is equivalent to a primary cell, generating an electric current and feeding back to the universal meter along the wire.

[0014] Step S5: After the first measurement is completed, if no current is generated, it indicates that there is no horizontal fracture conduction at this position. Since the fractures are more densely developed at lower elevations, the position of the second double-end water-blocking air bag is moved, and a period of observation is performed. When an effective current value is measured, the metal plate surface is washed with water flow using the cleaning nozzle to remove residual electrolyte solution and prepare for the next measurement.

[0015] If an effective current value is measured in a measurement, it is considered that the fractures at the borehole A2 corresponding to the water outlet hole are horizontally developed to the borehole B3 region corresponding to the second double-end water-blocking air bag.

[0016] S6: The first double-end water-blocking air bag in the borehole A is adjusted to the next position to be measured by the first fixed guide rod, and the above steps are repeated to complete the development area detection of the water-conducting fracture zone.

[0017] The beneficial effects produced by the above technical scheme are that: by setting the double-end water plugging air bag which can slide to change the position, the cumbersome process of measuring while withdrawing the drill pipe in the traditional method is avoided, and the problem of hole collapse caused by withdrawing the drill pipe in the actual engineering is also avoided; in the case that the flow of hole B is small, this scheme can also produce a feedback electric signal more sensitively; by setting the water outlet nozzle to flush the residual electrolyte liquid in the upper hole, the accuracy of repeated measurement results is ensured, and the service life of the equipment is also prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be described in further detail below with reference to the drawings and specific embodiments.

[0019] Fig. 1 is a structural schematic diagram of the system described in the embodiments of the application;

[0020] Fig. 2 is a partial structural schematic diagram of the second drill pipe in the system described in the embodiments of the application;

[0021] Wherein: 1, water conducting fractured zone; 2, drill hole A; 3, drill hole B; 4, first double-end water plugging air bag; 5, water outlet hole; 6, first fixed guide rod; 7, first gas pressure resistant pipe; 8, first pressure resistant water conveying pipe; 9, second double-end water plugging air bag; 10, water inlet hole; 11, second gas pressure resistant pipe; 12, first plugging; 13, first metal plate; 14, second metal plate; 15, cleaning nozzle; 16, wire; 17, universal meter; 18, potentiometer; 19, second pressure resistant water conveying pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the application.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the application, but the application can be practiced without the specific details, which are not described herein, by persons of ordinary skill in the art. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0024] As Figs. 1-2As shown, the embodiment of the present application discloses a water conducting fractured zone monitoring system based on electric signal, which comprises two parallel drill holes A and drill hole B in water conducting fractured zone 1, the two parallel drill holes A and drill hole B are drilled by using drill bit and drill rod, and the specific size of the two drill holes is not described in detail here; a drill bit and a drill rod connected with the drill bit are arranged in each drill hole, the outer side of the first drill rod in the drill hole A2 is provided with a first double-end water plugging air bag 4, the two air bags on the first double-end water plugging air bag 4 have linkage effect and can realize simultaneous inflation and exhaust.

[0025] The first drill rod between the first double-end water plugging air bag 4 is provided with a water outlet hole 5, and the water outlet hole 5 is arranged along the circumference of the first drill rod; the outer side of the first drill rod is provided with a first fixed guide rod 6, the upper end of the first fixed guide rod 6 is connected with the first double-end water plugging air bag 4, and the first fixed guide rod 6 is used for driving the first double-end water plugging air bag 4 to move up and down along the outer circumference of the first drill rod; the upper end of the first gas pressure resistant pipe 7 is communicated with the first double-end water plugging air bag 4, and the first gas pressure resistant pipe 7 is used for inflating the first double-end water plugging air bag 4; the first drill rod is provided with a first pressure resistant water pipe 8, and the first pressure resistant water pipe 8 is used for providing electrolyte liquid into the space between the first double-end water plugging air bag 4; the first drill rod is provided with a second plugging, and the first pressure resistant water pipe 8 penetrates through the second plugging, and the first pressure resistant water pipe 8 provides electrolyte liquid into the space between the first double-end water plugging air bag 4 by pressurization.

[0026] The outer side of the second drill rod in the drill hole B3 is provided with a second double-end water plugging air bag 9, a plurality of water inlet holes 10 are arranged on the second drill rod between the second double-end water plugging air bag 9, preferably, the water inlet hole 10 is arranged in five circles, and the distance between each water inlet hole 10 is 1m, and it should be noted that the water inlet hole 10 can also be arranged in other numbers, which is not described here; the outer side of the second drill rod is provided with a second fixed guide rod, the upper end of the second fixed guide rod is connected with the second double-end water plugging air bag 9, and the second fixed guide rod is used for driving the second double-end water plugging air bag 9 to move up and down along the outer circumference of the second drill rod; the upper end of the second gas pressure resistant pipe 11 is communicated with the second double-end water plugging air bag 9, and the second gas pressure resistant pipe 11 is used for inflating the second double-end water plugging air bag 9; the second drill rod is provided with a first plugging 12, the first plugging 12 is fixed with a first metal plate 13, a second metal plate 14 and a cleaning spray head 15, the first metal plate 13 is connected with one input end of a universal meter 17 through a wire 16, the other input end of the universal meter 17 is connected with the second metal plate 14 through a potential meter 18 and a wire 16, and the cleaning spray head 15 is connected with a second pressure resistant water pipe 19, which is used for providing cleaning water for the cleaning spray head 15. The activity of the first metal plate 13 and the second metal plate 14 is different, and when they contact the electrolyte liquid, a potential difference can be generated between them.

[0027] Accordingly, the application also discloses a water flowing fractured zone monitoring method based on an electric signal, which uses the monitoring system and comprises the following steps.

[0028] Step S1: drilling two parallel drill holes A2 and B3 in a region to be measured.

[0029] Step S2: before measurement, moving the first double-end water plugging air bag 4 to the position to be measured through the first fixed guide rod 6, inflating the first double-end water plugging air bag 4 through the first pressure-resistant air pipe 7, and making the first double-end water plugging air bag 4 adhere to the hole wall to avoid electrolyte loss.

[0030] Step S3: delivering electrolyte through the first pressure-resistant water pipe 8 and discharging the electrolyte into the space between the first double-end water plugging air bag 4 and the drill hole A2 through the water outlet hole 5; according to engineering experience, under the water injection pressure of 0.2 MPa, the water injection amount of the water flowing fractured zone development region is between 6 L / min and 30 L / min per meter per minute, which can be used as a basis to determine whether the position to be measured is in the water flowing fractured zone; if the water injection amount is higher than 30 L / min, it indicates that the position to be measured is in the caving zone; if the water injection amount is lower than 6 L / min, it indicates that the position to be measured is higher than the top end of the water flowing fractured zone, and the first double-end water plugging air bag 4 needs to be deflated to discharge the electrolyte and lower the measurement height through the sliding sheet.

[0031] Step S4: after the drill hole A determines the water flowing fractured zone, the horizontal development detection operation can be started; first, a lively first metal plate 13 and an unreactive second metal plate 14 are arranged in the second drill rod, and a complete test circuit is formed by connecting the universal meter 17 and the potentiometer 18 through the wires 16; the second double-end water plugging air bag 9 is arranged at the two sides of a ring of water inlet holes 10; if the region between the second double-end water plugging air bags 9 is conducted by the horizontal fracture, the electrolyte will flow from the water outlet position of the drill hole A2 into the second double-end water plugging air bags 9, and then flow into the drill rod through the water inlet holes 10 between the second double-end water plugging air bags 9, and the electrolyte is intercepted by the first plugging, and the electrolyte contacts the first metal plate 13 and the second metal plate 14 on the first plugging, and under the action of the electrolyte, the electrons between the two metal plates are transferred, at this time, the region is equivalent to a primary cell, and an electric current is generated and fed back to the universal meter 17 along the wires.

[0032] Step S5: after one measurement, if no electric current is generated, it indicates that there is no horizontal fracture conduction at this position; since the fractures are more densely developed at a lower elevation, the position of the second double-end water plugging air bag 9 is moved, and a period of time is observed; after an effective current value is measured, the metal plate surface is washed with water flow through the cleaning nozzle 15 to remove the residual electrolyte, and the next measurement is prepared.

[0033] If the effective current value is measured in a measurement, it is considered that the fracture in the drilling hole A2 corresponding to the water outlet hole 5 develops horizontally to the drilling hole B3 region corresponding to the second double-end water plugging air bag 9;

[0034] S6: Adjust the first double-end water plugging air bag 4 in the drilling hole A to the next to-be-measured position through the first fixed guide rod 6, and repeat the above steps, so as to complete the development region detection of the water-conducting fracture zone.

Claims

1. A waterfissure zone monitoring system based on electrical signals, characterized by: It includes two parallel drill holes A (2) and drill hole B (3) in water conducting fracture zone (1), a drill head and a drill rod connected with the drill head are arranged in each drill hole, a first double-end water plugging air bag (4) is arranged on the outer side of the first drill rod in the drill hole A (2), a water outlet hole (5) is arranged on the first drill rod between the first double-end water plugging air bag (4), a first fixed guide rod (6) is arranged on the outer side of the first drill rod, the upper end of the first fixed guide rod (6) is connected with the first double-end water plugging air bag (4), which is used for driving the first double-end water plugging air bag (4) to move up and down along the outer periphery of the first drill rod, the upper end of the first air pressure resistant pipe (7) is communicated with the first double-end water plugging air bag (4), which is used for inflating the first double-end water plugging air bag (4); a first pressure resistant water pipe (8) is arranged in the first drill rod, and an electrolyte liquid is provided into the space between the first double-end water plugging air bag (4) through the first pressure resistant water pipe (8); A second double-end water plugging air bag (9) is arranged on the outer side of the second drill rod in the drill hole B (3), a plurality of water inlet holes (10) are arranged on the second drill rod between the second double-end water plugging air bag (9), a second fixed guide rod is arranged on the outer side of the second drill rod, the upper end of the second fixed guide rod is connected with the second double-end water plugging air bag (9), which is used for driving the second double-end water plugging air bag (9) to move up and down along the outer periphery of the second drill rod, the upper end of the second air pressure resistant pipe (11) is communicated with the second double-end water plugging air bag (9), which is used for inflating the second double-end water plugging air bag (9); a first plugging (12) is arranged in the second drill rod, a first metal plate (13), a second metal plate (14) and a cleaning spray head (15) are fixed on the first plugging (12), the first metal plate (13) is connected with one input end of a universal meter (17) through a wire (16), the other input end of the universal meter (17) is connected with the second metal plate (14) through a potential transformer (18) and a wire (16), the activity of the first metal plate (13) is different from that of the second metal plate (14), when they contact with the electrolyte liquid, a potential difference can be generated between them.

2. The electrical signal-based waterfissure zone monitoring system of claim 1, wherein: The first drill rod is provided with a second plugging, the first pressure resistant water pipe (8) passes through the second plugging, and the electrolyte liquid is provided into the space between the first double-end water plugging air bag (4) through the first pressure resistant water pipe (8) in a pressurized manner.

3. The electrical signal based waterfissure zone monitoring system of claim 1, wherein: The water inlet hole (10) is provided with five circles, and the distance between each water inlet hole (10) is 1m.

4. The electrical signal-based waterfissure zone monitoring system of claim 1, wherein: The cleaning spray head (15) is connected with a second pressure resistant water pipe (19) for providing cleaning water for the cleaning spray head (15).

5. A method of monitoring a water- fractured zone based on an electrical signal, the method using a monitoring system as claimed in any one of claims 1 to 4, characterized in that, The method comprises the following steps: Step S1: drilling two parallel drill holes A (2) and drill hole B (3) in the water conducting fracture zone (1) to be measured; Step S2: Before measurement, the first double-end water blocking air bag (4) is moved to the position to be measured by the first fixed guide rod (6) in the borehole A (2), and is inflated through the first pressure-resistant air pipe (7) to adhere to the borehole wall to avoid loss of electrolyte solution; Step S3: The electrolyte solution is delivered through the first pressure-resistant water pipe (8) and discharged into the space between the first double-end water blocking air bag (4) and the borehole A (2) through the water outlet hole (5). According to the practical experience of the project, the water injection amount per minute per meter of borehole section in the water-conducting fracture development area is between 6 L / min and 30 L / min under the water injection pressure of 0.2 MPa. Whether the position to be measured is in the water-conducting fracture zone is determined based on this. If the water injection amount is higher than 30 L / min, it indicates that the position to be measured is in the caving zone. If the water injection amount is lower than 6 L / min, it indicates that the position to be measured is higher than the top end of the water-conducting fracture zone, and the first double-end water blocking air bag (4) needs to be deflated to discharge the liquid and lower the measurement height through the sliding sheet; Step S4: After the water-conducting fracture zone of the borehole A (2) is determined, the horizontal fracture development detection operation can be started. First, a lively first metal plate (13) and an unreactive second metal plate (14) are loaded in the second drill rod, and a complete test circuit is formed by connecting the universal meter (17) and the potentiometer (18) through the wires (16). The second double-end water blocking air bag (9) is placed on both sides of a circle of water inlet holes (10). If the area between the second double-end water blocking air bags (9) is conducted by the horizontal fracture, the electrolyte solution will flow from the water outlet hole (5) of the borehole A (2) into the space between the second double-end water blocking air bags (9) and then flow into the drill rod through the water inlet holes (10) between the second double-end water blocking air bags (9). The electrolyte solution is intercepted by the first blocking, and the electrolyte solution contacts the first metal plate (13) and the second metal plate (14) on the first blocking. Under the action of the electrolyte solution, the electrons between the two metal plates are transferred. At this time, the area is equivalent to a primary cell, and an electric current is generated and fed back to the universal meter (17) along the wire; Step S5: After one measurement is completed, if no electric current is generated, it indicates that there is no horizontal fracture conduction at this position. Since the fractures are more densely developed at lower elevations, the position of the second double-end water blocking air bag (9) is moved, and the metal plate surface is washed with water flow to remove the residual electrolyte solution and prepare for the next measurement; If an effective current value is measured in a certain measurement, it is considered that the horizontal development of the fracture at the borehole A (2) corresponding to the water outlet hole (5) reaches the area of the borehole B (3) corresponding to the second double-end water blocking air bag (9); S6: The first double-end water blocking air bag (4) in the borehole A is adjusted to the next position to be measured by the first fixed guide rod (6), and the above steps are repeated to complete the development area detection of the water-conducting fracture zone.

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