Water-conducting fracture zone detection device and method integrated with automatic detection function

Abstract

The present application particularly relates to the technical field of water-conducting fracture zone detection. Provided are a water-conducting fracture zone detection device and method integrated with an automatic detection function. The detection device comprises: a drill pipe and an elastic water-storage pouch, wherein a head region and a tail region are provided on two sides of the drill pipe, respectively; a water supply channel is provided inside the drill pipe, a first channel is provided on the side wall of the drill pipe, and a first valve is provided inside the first channel; the drill pipe in the head region is provided with a second channel, and a first flow meter and a second valve are provided inside the water supply channel between the second channel and the elastic water-storage pouch; a water return line is provided between the head region and the tail region of the drill pipe, and the water return line runs through the elastic water-storage pouch and connects the outside of the head region of the drill pipe and the outside of the tail region of the drill pipe; and a second flow meter is provided inside the water return line. The water-conducting fracture zone detection device and method integrated with an automatic detection function provided by the present application can complete the detection of a water-conducting fracture zone while drilling, such that the labor intensity of workers can be reduced.

Description

Water-conducting fracture zone detection device and method with integrated automatic detection function

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on January 31, 2024, with application number 202410129368.1 and titled “Device and method for detecting water-conducting fracture zones with integrated automatic detection function,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the technical field of water-conducting fracture zone detection, and in particular relates to a water-conducting fracture zone detection device and method with integrated automatic detection function. Background Art

[0004] During coal mining, as the overlying rock strata move into free space as coal is extracted, a certain range of fractures develop above the roof. When a water-rich layer exists above the coal seam, whether these fractures connect to the aquifer determines the safety of the working face. Therefore, determining the extent of fracture development above the coal seam is crucial for ensuring safe and efficient coal mining.

[0005] Chinese patent application number CN1062974A applies to a drilled hole segmented water injection and aeration leak detection technology. The patent application includes a double-ended water shutoff device and a method for injecting water into a drilled hole using the double-ended water shutoff device and determining the development of water-conducting fracture zones based on the borehole's leakage. The double-ended water shutoff device comprises a water-filled capsule and a valve core-based rubber ring check valve installed at each end of a connecting pipe. The double-ended water shutoff device is connected to a hose that is pushed into the drilled hole by a rod. The lower end of the hose is connected to a water injection observation device. This device injects water into the sealed sections within the capsules at both ends and determines the development of fractures by observing the injection pressure and the change in water flow rate per unit time.

[0006] The disadvantage of this method is that when measuring the double-ended water shutoff device, the drilling must be completed first, and then the measuring device must be sent to the test position for testing by the drill pipe. This process requires the drill pipe to be loaded and unloaded twice, which greatly increases the workload of the workers.

[0007] Therefore, the present application provides a technical solution to address the above-mentioned deficiencies in the prior art.

[0008] Summary of the Invention

[0009] The purpose of this application is to provide a water-conducting fracture zone detection device and method with integrated automatic detection function, so as to solve the problem in the prior art that the detection process requires the drill rod to be loaded and unloaded twice, which greatly increases the workload of workers.

[0010] In order to achieve the above objectives, this application provides the following technical solutions:

[0011] In a first aspect of an embodiment of the present application, a water-conducting fracture zone detection device with an integrated automatic detection function is provided, comprising a drill pipe and an elastic water storage bag located on the outer periphery of the middle portion of the drill pipe; the area of ​​the drill pipe covered by the elastic water storage bag is a blocking area, and the blocking area is flanked by a head area and a tail area.

[0012] The drill rod has an axially arranged water supply channel inside, a drill bit is provided at the end of the head area, and the end of the tail area is used to connect to the drilling rig; the side wall of the drill rod is provided with a first channel connecting the inside of the elastic water storage bag and the water supply channel, and a first valve is provided in the first channel; the drill rod in the head area is provided with a second channel connecting the water supply channel and the outside of the drill rod, and a first flow meter and a second valve are provided in the water supply channel between the second channel and the elastic water storage bag; a return water pipeline is provided between the head area and the tail area of ​​the drill rod, and the return water pipeline passes through the elastic water storage bag and connects the outside of the head area of ​​the drill rod with the outside of the tail area; a second flow meter is provided in the return water pipeline.

[0013] In an optional embodiment of the present application, a first overflow valve is provided in the return water pipeline.

[0014] In an optional embodiment of the present application, the return water pipeline is U-shaped, including a first tube, a second tube and a third tube connected vertically to each other; the first tube and the third tube are respectively located in the side walls of the drill pipe in the head area and the tail area, and the second tube is located in the water supply channel; and / or the middle of the first channel is connected to the third channel, the end of the third channel is connected to the outside of the tail area, and a second overflow valve is provided in the third channel.

[0015] In an optional embodiment of the present application, a drill rod controller is provided on the outside of the drill rod and is connected to the first flow meter, the second flow meter, the first valve, and the second valve.

[0016] In an optional embodiment of the present application, the drill rod controller is connected to an external control device.

[0017] In an optional embodiment of the present application, the elastic water storage bag is made of rubber; and / or the end of the drill rod in the tail area is threadedly connected to one end of the adapter drill rod, and the other end of the adapter drill rod is connected to the drilling rig; and / or the first valve and the second valve are solenoid valves.

[0018] In a second aspect of an embodiment of the present application, a method for detecting a water-conducting fracture zone with an integrated automatic detection function is provided, using the water-conducting fracture zone detection device with an integrated automatic detection function described in any one of the first aspects above. The detection method includes the following steps:

[0019] Step A. Connect the end of the head region of the drill pipe to the drill bit, and the end of the tail region to the drilling rig, flow water into the water supply channel, keep the first valve closed, open the second valve, start the drilling rig, drill to the location to be detected, and stop drilling;

[0020] Step B. controlling a drill rod controller on the drill rod via an external control device outside the borehole, causing the drill rod controller to close the second valve, open the first valve, and fill the elastic water storage bag with water through the first channel to expand it outward and seal the borehole;

[0021] Step C. Controlling the drill rod controller via an external control device outside the borehole to cause the drill rod controller to open the second valve and close the first valve, thereby filling the space between the head region and the borehole with water through the second channel; after the water is fully filled, the water flows out to the tail region via the return pipe;

[0022] Step D. Recording the flow data of the first flow meter and the second flow meter within a unit time to obtain a first flow value and a second flow value;

[0023] Step E. Stop supplying water to the water supply channel, control the drill rod controller through the external control device outside the borehole, so that the drill rod controller opens the first valve, closes the first valve after the elastic water storage bag is tightly attached to the drill rod, and continues drilling to the next detection position.

[0024] In an optional embodiment of the present application, in step A, the maximum length of the borehole is determined by calculating the maximum development height of the water-conducting fracture zone; and / or in step B, the elastic water storage bag is filled with water through the first channel until the second overflow valve in the third channel connected to the first channel opens and feeds back a signal; and / or in step C, step D is executed after the first overflow valve in the return water pipeline opens and feeds back a signal.

[0025] In an optional embodiment of the present application, in step D, whether the location to be detected contains a crack is determined based on the ratio of the first flow value to the second flow value, and the development degree Δ of the crack is obtained at the location to be detected. The calculation formula of the development degree Δ of the crack is as follows:

[0026] Where: Δ is the degree of fracture development in the borehole detection section, q1 is the second flow value, q2 is the first flow value, and k is the pressure correction coefficient;

[0027] When Δ≥0.9, it means that the cracks in the borehole detection section are almost undeveloped, and the borehole detection position is judged to be in a complete section;

[0028] When 0.9>Δ≥0.5, it means that the crack development degree of the drilling detection section is relatively slow, and it is judged that cracks exist at the drilling detection position, but the crack development degree is not serious;

[0029] When 0.5>Δ≥0.2, it indicates that the degree of fracture development in the borehole detection section is relatively serious, and it is judged that the borehole detection location is close to the development range of the water-conducting fracture zone;

[0030] When Δ<0.2, it indicates that the degree of fracture development in the borehole detection section is serious, and it is judged that the borehole detection position is in the development range of the water-conducting fracture zone.

[0031] In an optional embodiment of the present application, the pressure correction coefficient k is 1.

[0032] The advantages and beneficial effects of the embodiments of the present application are:

[0033] The present invention provides a device and method for detecting water-conducting fracture zones with integrated automatic detection capabilities. By integrating an automatic detection device onto a drill pipe, the device can detect water-conducting fracture zones while drilling, significantly reducing worker labor intensity and detection time. Furthermore, by controlling the hydrostatic pressure at the detection location, accurate judgment of water-conducting fracture zone observations can be made, improving the accuracy of these observations and reducing the uncertainty inherent in conventional double-ended water shutoff devices.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a schematic structural diagram of a water-conducting fracture zone detection device with integrated automatic detection function provided by an embodiment of the present application;

[0037] FIG2 is a schematic diagram of a water-conducting fracture zone detection device with an integrated automatic detection function provided in an embodiment of the present application;

[0038] FIG3 is a schematic diagram of a drilling direction setting device for detecting a water-conducting fracture zone with an integrated automatic detection function provided by an embodiment of the present application when in use;

[0039] FIG4 is a schematic diagram of the estimated water flow rate of a water-conducting fracture zone detection device with integrated automatic detection function provided by an embodiment of the present application when in use.

[0040] The accompanying drawings are marked as follows: 1. Drill rod; 10. Water supply channel; 11. First channel; 12. Second channel; 13. Third channel; 2. Elastic water storage bag; 3. Drill bit; 4. Drilling rig; 51. First valve; 52. Second valve; 61. First flow meter; 62. Second flow meter; 7. Return water pipeline; 71. First pipe; 72. Second pipe; 73. Third pipe; 81. First overflow valve; 82. Second overflow valve; 9. Drill rod controller; 91. External control device; 101. Coal seam; 102. Rock layer; 103. Curve. Specific embodiments

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] In the description of this application, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and do not require that this application must be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this application. The terms "connected", "connected" and "set" used in this application should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] In a first aspect, an embodiment of the present application provides a water-conducting fracture zone detection device with an integrated automatic detection function. Referring to Figures 1 and 2, Figure 1 is a structural schematic diagram of a water-conducting fracture zone detection device with an integrated automatic detection function provided by an embodiment of the present application, and Figure 2 is a schematic diagram of the use status of a water-conducting fracture zone detection device with an integrated automatic detection function provided by an embodiment of the present application. The device includes a drill rod 1 and an elastic water storage bag 2 located on the outer periphery of the middle part of the drill rod 1. The material of the elastic water storage bag 2 is preferably rubber. When in use, the drill rod 1 and the elastic water storage bag 2 are located in a borehole. The interior of the elastic water storage bag 2 can be filled with water and expanded, thereby sealing the borehole. The area of ​​the drill rod 1 covered by the elastic water storage bag 2 is a sealing area. The areas of the drill rod 1 on both sides of the sealing area are the head area and the tail area, respectively. The length of the head area is preferably 1m. The length of the head area is only for illustrative purposes and is not limited thereto. It is subject to actual needs.

[0044] The drill pipe 1 has an axially arranged water supply channel 10 inside. This channel 10 connects to a water source, for example, via a rotary joint at the end of the drill pipe's tail region. A drill bit 3 is located at the end of the head region for drilling and forming a hole, while the tail region is connected to a drilling rig 4 for rotating the drill pipe 1 and drilling. Preferably, the diameter of the drill bit 3 is larger than that of the drill pipe 1. A first channel 11 is provided on the sidewall of the drill pipe 1, connecting the interior of the elastic water storage bladder 2 with the water supply channel 10. Through this first channel 11 and the water supply channel 10, water can be supplied to the elastic water storage bladder 2 to expand it, or water in the expanded elastic water storage bladder 2 can be recirculated to deflate it. A first valve 51 is located within the first channel 11. For example, the first valve can be a solenoid valve, which can control the opening and closing of the first channel 11. Preferably, the first channel 11 is arranged radially along the drill pipe 1. The drill rod 1 in the head area is provided with a second channel 12 connecting the water supply channel 10 and the outside of the drill rod 1. Through the second channel 12 and the water supply channel 10, water can be supplied to the outside of the head area of ​​the drill rod 1 to detect water-conducting fracture zones. In an embodiment of the present application, the second channel 12 is located on the side wall of the drill rod 1 and is arranged radially along the drill rod 1. In an optional embodiment of the present application, the second channel 12 is formed by the end of the drill rod and the hole in the drill bit 3, so that the water in the water supply channel 10 flows out from the end of the drill rod 1 and the hole in the drill bit 3. A first flowmeter 61 is provided in the water supply channel 10 between the second channel 12 and the elastic water storage bag 2 to measure the flow data of the water supply channel 10 supplying water to the second channel 12, and a second valve 52 is provided to control the on and off of the water supply channel 10. A return water line 7 is provided between the head and tail regions of the drill pipe 1. This line passes through the elastic water storage bladder 2 and, when the bladder 2 expands to seal the drill hole, connects the exterior of the head and tail regions of the drill pipe 1, allowing test water to flow out. To measure the flow rate of the return water, a second flowmeter 62 is provided within the return water line 7.

[0045] When the water-conducting fracture zone detection device with integrated automatic detection function provided by the embodiment of the present application is used, the drill rod 1 is installed with the drill bit 3 and connected to the drilling rig 4, the first valve 51 is closed, the second valve 52 is opened, and after drilling to the position to be detected, drilling is stopped to form a borehole. At this time, the first valve 51 is opened, the second valve 52 is closed, and water is added to the elastic water storage bag 2 through the water supply channel 10 and the first channel 11 in the drill rod 1 to expand it, thereby sealing the borehole and forming a closed space between the elastic water storage bag 2 and the innermost end of the borehole (the annular space between the head area of ​​the drill rod and the inner wall of the borehole); then the first valve 51 is closed, the second valve 52 is opened, and water is supplied to the closed space through the water supply channel 10 and the second channel 12 until the water in the closed space flows from the return pipe 7 to the tail area of ​​the drill rod 1. In this process, the flow data of the first flow meter 61 and the second flow meter 62 can be used to determine the condition of the water-conducting fracture zone at the tested position.

[0046] Therefore, when using the water-conducting fracture zone detection device with integrated automatic detection function provided by the embodiment of the present application, there is no need to first drill a hole with a drill rod and then use the drill rod to send the measuring device in for measurement as in the prior art. When using the water-conducting fracture zone detection device with integrated automatic detection function provided by the embodiment of the present application, the entire detection process only requires the drill rod to be installed and then drilled to form a hole. When drilling to the position to be detected, there is no need to disassemble the drill rod and the water-conducting fracture zone can be detected at the same time. Therefore, the labor intensity and testing time of workers are greatly reduced.

[0047] In addition, in the prior art, water is typically injected into the water bag using a hose. As the drill rod moves within the borehole, the hose inevitably rubs against the borehole wall, which can easily cause the hose to wear out or break, resulting in the inability to continue detection. However, the water-conducting fracture zone detection device with integrated automatic detection function provided in the present embodiment supplies water to the elastic water storage bag 2 through the water supply channel 10 and the first channel 11 within the drill rod 1, eliminating the hose wear and breakage problems encountered in the prior art. This improves the service life of the water-conducting fracture zone detection device and the integrity of the detection project.

[0048] When conducting a water flow test in a closed space per unit time, the pressure in the closed space plays a decisive role in the size of the water flow. In order to reasonably determine and stabilize the hydrostatic pressure of the blocking section and reduce the error of the water flow test, in a preferred embodiment of the present application, a first overflow valve 81 is provided in the return pipe 7. The function of the first overflow valve 81 is that when the water pressure in the closed space reaches a predetermined value, water flows out of the first overflow valve 81 and maintains the water pressure in the closed space at a predetermined value. The first overflow valve 81 can determine and stabilize the hydrostatic pressure of the blocking section, eliminating the disadvantage that the net water pressure of the test point is difficult to determine when testing long, high and downward-sloping boreholes with a traditional double-ended water shutoff device, and at the same time eliminating the interference caused by pressure fluctuations in the closed space, thereby reducing the error of the water flow test. The above-mentioned predetermined value is subject to actual needs, and the embodiments of the present application do not limit this.

[0049] In a preferred embodiment of the present application, the middle portion of the first channel 11 is connected to the third channel 13, the end of the third channel 13 being in communication with the exterior of the tail region. A second relief valve 82 is disposed within the third channel 13. The second relief valve 82 ensures that when the water pressure within the elastic water storage bladder 2 exceeds a predetermined value, water flows out of the second relief valve 82, maintaining the water pressure within the elastic water storage bladder 2 at the predetermined value. By setting the opening pressure of the second relief valve 82, the elastic water storage bladder 2 can expand to seal the drilled hole, while preventing the elastic water storage bladder 2 from being damaged by the water pressure exceeding its tolerance.

[0050] In an optional embodiment of the present application, the return water pipeline 7 can be located outside the drill rod 1. For example, the return water pipeline can be a straight pipe that passes through the elastic water storage bag 2, connects the outside of the head area (enclosed space) of the drill rod 1 with the outside of the tail area, allows water to flow out of the enclosed space and has its flow rate tested by the second flow meter 62. In a preferred embodiment of the present application, in order to prevent the drill rod 1 from rotating and wearing out the return water pipeline 7, the return water pipeline 7 is U-shaped and includes a first pipe 71, a second pipe 72 and a third pipe 73 that are vertically connected to each other. The first pipe 71 and the third pipe 73 are respectively located in the side walls of the drill rod 1 in the head area and the tail area, and the second pipe 72 is located in the water supply channel 10, passing through the elastic water storage bag 2 from the inside of the drill rod 1.

[0051] In an optional embodiment of the present application, a drill rod controller 9 is provided on the outside of the drill rod 1 and is connected to the first flow meter 61, the second flow meter 62, the first valve 51, and the second valve 52. Preferably, the drill rod controller 9 is fixed in a groove on the outside of the drill rod 1 to prevent wear of the drill rod controller when the drill rod 1 rotates. Further preferably, the drill rod controller 9 is connected to an external control device 91, which can be connected wirelessly or by wire, allowing an operator to control the drill rod controller 9 from outside the drill rod 1. When a wired connection is adopted, a cable can be connected to the drill rod controller 9 through the water supply channel 10 to prevent wear of the cable when the drill rod 1 rotates.

[0052] In an optional embodiment of the present application, the drill pipe controller 9 can be a combination of a commercially available circuit board and an explosion-proof battery in an explosion-proof, waterproof housing. This structure is welded to a groove on the outside of the drill pipe and connected to all valves and flowmeters in the drill pipe via waterproof wires, enabling control of valve opening and flowmeter flow data. The external control device 91 can be a combination of a commercially available circuit board and an explosion-proof battery in an explosion-proof, waterproof housing. This structure is connected to the end of the drill pipe tail region via magnetic metal. Using the drill pipe as a signal transmission medium, it connects to the drill pipe controller via a single-wire transmission protocol, enabling remote control of the drill pipe controller and access to data collected by the drill pipe controller.

[0053] When the drilling depth is too great and the drill rod cannot reach it, in an optional embodiment of the present application, the end of the drill rod 1 in the tail area is threadedly connected to one end of the adapter drill rod (not shown in the figure), and the other end of the adapter drill rod is connected to the drilling rig to lengthen the drill rod 1 so that it can complete the detection of the water-conducting fracture zone even when the drilling depth is too great.

[0054] In a second aspect, an embodiment of the present application provides a method for detecting a water-conducting fracture zone with an integrated automatic detection function. The method uses the above-mentioned water-conducting fracture zone detection device with an integrated automatic detection function. The method includes the following steps:

[0055] Step A. Connect the head region end of the drill pipe 1 to the drill bit 3 and the tail region end to the drill rig 4. Flow water into the water supply channel 10, keep the first valve 51 closed, and open the second valve 52. Start the drill rig 4 and drill toward the rock layer 102 above the coal seam 101 (the coal seam 101 and the rock layer 102 can be seen in FIG2 ). Drill to the location to be detected and stop drilling. In this step, before drilling, connect the external control device 91 to the drill pipe 1 to test the signal connectivity between the external control device 91 and the drill pipe controller 9. Flow water to test whether the first valve 51, the second valve 52, the first flowmeter 61, and the second flowmeter 62 are functioning properly.

[0056] Step B. controlling the drill rod controller 9 via the external control device 91 outside the borehole to close the second valve 52 and open the first valve 51, thereby filling the elastic water storage bag 2 with water through the first channel 11 to expand it outward and seal the borehole;

[0057] Step C. Controlling the drill rod controller 9 via the external control device 91 outside the borehole to open the second valve 52 and close the first valve 51, thereby filling the enclosed space between the head region and the borehole with water through the second channel 12; after the water is fully filled, the water flows out to the tail region via the return pipe 7;

[0058] Step D. Record the flow data of the first flow meter 61 and the second flow meter 62 per unit time to obtain a first flow value and a second flow value;

[0059] Step E. Stop supplying water to the water supply channel 10, control the drill rod controller 9 through the external control device 91 outside the borehole, and make the drill rod controller 9 open the first valve 51. The water in the elastic water storage bag 2 flows out under the squeezing action of the elastic force. After the elastic water storage bag 2 is tightly attached to the drill rod, close the first valve 51 and continue drilling to the next test position.

[0060] An optional embodiment of the present application utilizes an external control device to control a drill pipe controller via the drill pipe as a signal transmission medium. Once the drill pipe reaches the desired location, in-situ detection can be performed without disassembling the drill pipe. The drill pipe controller controls the opening and closing of the first and second valves in the drill pipe and acquires data from the first and second flow meters. This allows for rapid and accurate determination of the amount of water lost per unit length of the borehole per unit time, thereby clarifying the extent of fracture development at a specific location. Compared to existing methods, this embodiment greatly simplifies the operational steps and reduces worker labor intensity.

[0061] In an optional embodiment of the present application, in step A, the maximum development height of the water-conducting fracture zone is first calculated to determine the maximum length of the borehole. The height of the water-conducting fracture zone in the overlying rock strata of the working face mining area can be calculated according to the formula in the "Regulations on Coal Pillar Retention and Compressed Coal Mining in Buildings, Water Bodies, Railways and Main Shafts and Tunnels", and then the maximum length of the borehole at a known angle can be obtained according to trigonometric functions.

[0062] In an optional embodiment of the present application, in step B, water is filled into the elastic water storage bag 2 through the first channel 11 until the second overflow valve 82 in the third channel 13 connected to the first channel 11 opens and feeds back a signal to maintain the water pressure in the elastic water storage bag 2 to reach a suitable predetermined value.

[0063] In an optional embodiment of the present application, in step C, the first overflow valve 81 in the return pipe 7 is opened and the step D is executed after the feedback signal. The function of the first overflow valve 81 is that when the water pressure in the enclosed space reaches a predetermined value, water flows out of the first overflow valve 81 and keeps the water pressure in the enclosed space at a predetermined value. The first overflow valve 81 can determine and stabilize the hydrostatic pressure of the blocking section, eliminate the interference caused by the pressure fluctuation in the enclosed space, and reduce the error of the water flow test. In step D, the water pressure in the enclosed space breaks through the limit of the first overflow valve 81, the second flowmeter 62 starts counting, and the first flowmeter 61 starts counting synchronously. The difference between the flow rates of the first flowmeter 61 and the second flowmeter 62 per unit time is the amount of water lost in the enclosed space per unit time. This data is recorded as the first flow value and the second flow value.

[0064] In an optional embodiment of the present application, in step D, whether the location to be detected contains a crack is determined based on the ratio of the first flow value to the second flow value, and the development degree Δ of the crack is obtained at the location to be detected. The calculation formula of the development degree Δ of the crack is as follows:

[0065] Where: Δ is the degree of fracture development in the borehole detection section, q1 is the second flow value, q2 is the first flow value, and k is the pressure correction coefficient.

[0066] When Δ≥0.9, it means that the cracks in the borehole detection section are almost undeveloped, and the borehole detection position is judged to be in a complete section;

[0067] When 0.9>Δ≥0.5, it means that the crack development degree of the drilling detection section is relatively slow, and it is judged that cracks exist at the drilling detection position, but the crack development degree is not serious;

[0068] When 0.5>Δ≥0.2, it indicates that the degree of fracture development in the borehole detection section is relatively serious, and it is judged that the borehole detection location is close to the development range of the water-conducting fracture zone;

[0069] When Δ<0.2, it indicates that the degree of fracture development in the borehole detection section is serious, and it is judged that the borehole detection position is in the development range of the water-conducting fracture zone.

[0070] In an optional embodiment of the present application, the pressure correction coefficient k can take a value of 1.

[0071] In an optional embodiment of the present application, the pressure correction coefficient k is used when different pressures are selected for the plugging section and is determined by field experiments in combination with the Bernoulli equation. The Bernoulli equation is described as follows: under the same operating conditions, when the plugging section pressure is p1, the flow rate v1 can be obtained. When the opening pressure of the first relief valve is modified to p2, the flow rate v2 can be obtained. When different opening pressures are selected for the first relief valve, the pressure correction coefficient k is v1 / v2:

[0072] Where p is the water pressure in the plugging section, which can be taken as the opening pressure of the first overflow valve, ρ is the water density, v is the flow velocity of water into the fracture zone, g is the acceleration of gravity, h is the water flow height at the detection point, and c is a constant.

[0073] Refer to Figure 3, which is a schematic diagram of the drilling direction setting of a water-conducting fracture zone detection device with integrated automatic detection function provided in an embodiment of the present application when in use. Figure 3 shows that the drilling direction of the drill rod 1 (arrow direction) and the horizontal direction have an angle of 45-60 degrees. This angle has been verified many times and can effectively protect the coal pillar.

[0074] Refer to Figure 4, which is a schematic diagram of the expected water flow rate of a water-conducting fracture zone detection device with integrated automatic detection function provided in an embodiment of the present application when in use. Figure 4 shows the water flow rate required (the arrow direction on the left side of the figure) along the drilling direction within the water-conducting fracture zone (the arrow direction on the right side of the figure). The water flow rate change is shown as the curve 103 between the two arrow directions in the figure. Outside the water-conducting fracture zone, the required water flow rate is relatively small. Inside the water-conducting fracture zone, due to the existence of cracks, water will be consumed, so the required water flow rate is relatively large.

[0075] The advantages of the water-conducting fracture zone detection device and method with integrated automatic detection function provided by the embodiments of the present application are as follows:

[0076] First, the traditional double-ended water shutoff test device requires the hole to be drilled first, and then the test device is connected to the hole and transported to the designated location for measurement. The entire process requires the drill pipe to be completely disassembled twice, which greatly increases the worker's labor intensity and time. At the same time, the long detection process can easily cause the hole to collapse, resulting in detection failure. The embodiment of the present application integrates the detection system into the drill pipe, completing the detection while the hole is being drilled, saving measurement time and reducing the worker's labor intensity.

[0077] Second, consistent water pressure within the enclosed section is crucial for ensuring test accuracy. When using traditional double-ended water shutoff devices to test long and high boreholes, it is extremely difficult to manually maintain consistent water pressure within the enclosed section. The detection device provided in this embodiment utilizes a relief valve to control the water pressure within the enclosed section, ensuring consistent water pressure throughout the entire detection process, thus ensuring detection accuracy.

[0078] Third, whether the elastic water bladder can be filled with water and expand to seal the borehole is a prerequisite for successful detection. Traditional double-ended water shutoff devices require an external water pipe when filling the water bladder, and only manual judgment based on experience can determine whether the rubber bladder has expanded to seal the borehole. During long-distance detection, the external water pipe is easily worn out, or the water pressure is too low to expand the water bladder to seal the borehole, while excessive water pressure can cause the water bladder to rupture. The detection device provided in the embodiment of the application utilizes the coordinated operation of the solenoid valve to eliminate the external water pipe. At the same time, an overflow valve is provided to ensure the appropriate water pressure in the elastic water bladder, allowing the elastic water bladder to expand to the appropriate level, ensuring the elastic water bladder can successfully seal the borehole and ensuring detection accuracy.

[0079] Fourth, when using the detection device provided in the embodiment of the present application for detection, the amount of water loss per unit time is completely read by the electronic device, thereby avoiding the errors caused by manual readings and ensuring the reliability of the data during the detection process.

[0080] Fifth, the detection device provided in the embodiment of the present application can be used in conjunction with existing drilling rigs and drill bits and has good adaptability.

[0081] Sixth, the detection device provided in the embodiment of the present application abandons the tediousness of the traditional double-ended water shutoff device for measuring the water-conducting fracture zone, which requires completing the drilling first and then sending the test device into the borehole for monitoring, as well as the inaccuracy of manually determining the measurement parameters and reading the measurement results. An external control device is used to control the drill rod controller through the drill rod as a signal transmission medium, and the drill rod controller is used to control the opening and closing of the valve in the integrated detection drill rod and obtain the data of the flow meter, so as to quickly and accurately obtain the water loss per unit time in the unit length of the borehole, and then clarify the degree of development of the fracture at a specific detection position.

[0082] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Furthermore, please note that instances of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0083] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water-conducting fracture zone detection device with integrated automatic detection function, characterized in that: It comprises a drill rod (1) and an elastic water storage bag (2) located on the outer periphery of the middle portion of the drill rod (1); the area of the drill rod (1) covered by the elastic water storage bag (2) is a blocking area, and the two sides of the blocking area are a head area and a tail area respectively; The drill rod (1) has a water supply channel (10) arranged axially inside, a drill bit (3) is provided at the end of the head region, and the end of the tail region is used to connect to a drilling rig (4); a first channel (11) is provided on the side wall of the drill rod (1) for connecting the inside of the elastic water storage bag (2) and the water supply channel (10), and a first valve (51) is provided in the first channel (11); the drill rod (1) in the head region is provided with a second channel (12) for connecting the water supply channel (10) and the outside of the drill rod, and a first flowmeter (61) and a second valve (52) are provided in the water supply channel (10) between the second channel (12) and the elastic water storage bag (2); a return water pipeline (7) is provided between the head region and the tail region of the drill rod (1), the return water pipeline (7) passes through the elastic water storage bag (2) and connects the outside of the head region and the outside of the tail region of the drill rod (1); a second flowmeter (62) is provided in the return water pipeline (7).

2. The water-conducting fracture zone detection device with integrated automatic detection function according to claim 1 is characterized in that: A first overflow valve (81) is provided in the return water pipeline (7).

3. The water-conducting fracture zone detection device with integrated automatic detection function according to claim 1 or 2, characterized in that: The return water pipeline (7) is U-shaped and comprises a first pipe (71), a second pipe (72) and a third pipe (73) which are vertically connected to each other; the first pipe (71) and the third pipe (73) are respectively located in the side walls of the drill pipe (1) in the head area and the tail area, and the second pipe (72) is located in the water supply channel (10); and / or the middle of the first channel (11) is connected to the third channel (13), the end of the third channel (13) is communicated with the outside of the tail area, and a second overflow valve (82) is provided in the third channel (13).

4. The water-conducting fracture zone detection device with integrated automatic detection function according to claim 1 or 2, characterized in that: A drill rod controller (9) is provided on the outside of the drill rod (1) and is connected to the first flow meter (61), the second flow meter (62), the first valve (51), and the second valve (52).

5. The water-conducting fracture zone detection device with integrated automatic detection function according to claim 4 is characterized in that: The drill rod controller (9) is connected to an external control device (91).

6. The water-conducting fracture zone detection device with integrated automatic detection function according to claim 1 or 2, characterized in that: The elastic water storage bag (2) is made of rubber; and / or the end of the drill rod (1) in the tail area is connected to one end of the adapter drill rod through a thread, and the other end of the adapter drill rod is connected to the drilling rig (4); and / or the first valve (51) and the second valve (52) are solenoid valves.

7. A method for detecting water-conducting fracture zones with an integrated automatic detection function, characterized in that: The water-conducting fracture zone detection device with integrated automatic detection function according to any one of claims 1 to 6 is used, and the detection method comprises the following steps: Step A. Connect the end of the head region of the drill rod (1) to the drill bit (3), and the end of the tail region to the drilling rig (4), flow water into the water supply channel (10), keep the first valve (51) closed, and the second valve (52) open, start the drilling rig (4), drill to the position to be detected, and stop drilling; Step B. controlling the drill rod controller (9) on the drill rod (1) through an external control device (91) outside the borehole, causing the drill rod controller (9) to close the second valve (52), open the first valve (51), and fill the elastic water storage bag (2) with water through the first channel (11) to expand it outward and close the borehole; Step C. controlling the drill rod controller (9) through an external control device (91) outside the borehole, causing the drill rod controller (9) to open the second valve (52), close the first valve (51), and store water in the space between the head area and the borehole through the second channel (12). After the water is fully stored, the water flows out to the tail area through the return pipe (7); Step D. recording the flow data of the first flow meter (61) and the second flow meter (62) within a unit time to obtain a first flow value and a second flow value; Step E. Stop supplying water to the water supply channel (10), control the drill rod controller (9) through the external control device (91) outside the borehole, and make the drill rod controller (9) open the first valve (51). After the elastic water storage bag (2) is in close contact with the drill rod, close the first valve (51) and continue drilling to the next detection position.

8. The water-conducting fracture zone detection method with integrated automatic detection function according to claim 7, characterized in that: In the step A, the maximum length of the borehole is determined by calculating the maximum development height of the water-conducting fracture zone; and / or in the step B, the elastic water storage bag (2) is filled with water through the first channel (11) until the second overflow valve (82) in the third channel (13) connected to the first channel (11) opens and feeds back a signal; and / or in the step C, the step D is performed after the first overflow valve (81) in the return water pipeline (7) opens and feeds back a signal.

9. The method for detecting water-conducting fracture zones with integrated automatic detection function according to claim 7, characterized in that: In step D, whether the location to be detected contains a crack is determined based on the ratio of the first flow value to the second flow value, and the development degree Δ of the crack is obtained at the location to be detected. The calculation formula of the development degree Δ of the crack is as follows: Where: Δ is the degree of fracture development in the borehole detection section, q1 is the second flow value, q2 is the first flow value, and k is the pressure correction coefficient; When Δ≥0.9, it means that the cracks in the borehole detection section are almost undeveloped, and the borehole detection position is judged to be in a complete section; When 0.9>Δ≥0.5, it means that the crack development degree of the drilling detection section is relatively slow, and it is judged that cracks exist at the drilling detection position, but the crack development degree is not serious; When 0.5>Δ≥0.2, it indicates that the degree of fracture development in the borehole detection section is relatively serious, and it is judged that the borehole detection location is close to the development range of the water-conducting fracture zone; When Δ<0.2, it indicates that the degree of fracture development in the borehole detection section is serious, and it is judged that the borehole detection position is in the development range of the water-conducting fracture zone.

10. The water-conducting fracture zone detection method with integrated automatic detection function according to claim 9, characterized in that: The pressure correction coefficient k is set to 1.

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