A drilling fissure dynamic detection device based on a recyclable hole sealer and a use method thereof

Abstract

This invention discloses a dynamic detection device for borehole fractures based on a recyclable sealing device and its usage method. The device consists of a series-connected long pipe, an adjustment module, an ultrasonic transmitting and receiving module, a microcontroller, a pressure accumulator, a support module, a drive device, a transducer, a signal control cable, and a display and control console. When using the device, it is connected and fixed to a gas drainage pipe and then inserted into the borehole. The borehole is sealed using the recyclable sealing device, and then gas drainage operations begin. Simultaneously, the dynamic detection of borehole fractures is performed on the display and control console through the adjustment module and the ultrasonic transmitting and receiving module. This invention can detect changes in borehole fractures during gas drainage, providing new methods and ideas for scientific research and the intelligent and visualized development of gas drainage operations.

Description

Technical Field

[0001] This invention belongs to the field of mine borehole detection, and relates to a dynamic detection device for borehole fractures based on a recyclable borehole sealer and its usage method. Background Technology

[0002] Borehole acoustic measurement is a commonly used method for detecting damage in mining engineering. It identifies and measures damage based on the propagation characteristics of sound waves in intact and fractured rock masses, as well as the differences in sound wave reflection between different rock masses. Gas drainage is a crucial means of controlling gas in mining operations. During gas drainage, due to the influence of ground stress and mining activities, the borehole section outside the sealing zone undergoes highly complex changes, generating numerous pore fractures and even fracturing. The impact of these changes on gas drainage operations remains a challenging problem to be solved. Currently, much research on this issue is still in the realm of simulation software development, lacking verification through field experiments.

[0003] Therefore, in order to solve the above problems, a dynamic detection device for borehole fractures based on a recyclable borehole sealer and its usage method are provided to meet the research needs of current scientific problems. Summary of the Invention

[0004] The purpose of this invention is to address the problem of detecting borehole fracture propagation during gas drainage by providing a dynamic borehole fracture detection device and its usage method based on a retrievable borehole sealer. To solve the above problem, this invention adopts the following technical solution:

[0005] This invention provides a dynamic detection device for borehole fractures based on a recyclable borehole sealer, comprising a series-connected long tube, an adjustment module, an ultrasonic transmitting and receiving module, a microcontroller, a pressure accumulator, a support module, a drive device, a transducer, a signal control cable, and a display and control console. The series-connected long tube is a rigid hollow tube, with a support module fixed on each of its left and right sides. The adjustment module is installed on the outer side of the middle of the series-connected long tube and consists of two sets of adjusting and lifting components and four long arc-shaped truncated cones, on which the ultrasonic transmitting and receiving modules are mounted. The drive device consists of a rotating motor, a transmission shaft connected to the rotating motor, and a gear with helical teeth on its surface mounted at the front end of the transmission shaft. The drive unit is installed inside the series-connected long pipe and connected to the adjustment module. The drive unit can drive the adjustment module to rotate around the series-connected long pipe. The pressure accumulator consists of a tank, a base, a hydraulic telescopic column, and a sealing slider. The pressure accumulator is installed and fixed in the middle position inside the series-connected long pipe. A microcontroller and a transducer are also installed on the right side of the pressure accumulator. The display and control console is connected to the adjustment module, pressure accumulator, microcontroller, ultrasonic transmitting and receiving module, drive unit, and support module through a signal control cable. The display and control console can control the opening, closing, and operation of the adjustment module, pressure accumulator, microcontroller, ultrasonic transmitting and receiving module, drive unit, and support module, and simultaneously store, analyze, and display detection data. When the borehole fracture dynamic detection device is not in operation, the lifting component of the adjustment module is in a retracted state to ensure that the borehole fracture dynamic detection device can smoothly enter the extraction borehole.

[0006] Furthermore, the outer diameter of the series-connected long pipe matches the inner diameter of the extraction pipe, and the left side of the series-connected long pipe is provided with an external thread that matches the internal thread of the extraction pipe port; two elongated slots are opened on the left side of the series-connected long pipe as air intake channels for the extracted gas; a pressure accumulator is installed in the middle part of the series-connected long pipe, and two coupling agent delivery flat pipes are provided on the inner wall of the series-connected long pipe. The middle part of the inner side of the coupling agent delivery flat pipe is connected to the coupling agent discharge pipe of the pressure accumulator by a connecting short pipe, and the middle part and both ends of the outer side of the coupling agent delivery flat pipe are provided with long bend pipe interfaces that are connected to the long bend pipes.

[0007] Furthermore, the adjusting lifting component consists of a central rotating shaft and four vertically arranged lifting devices; the central rotating shaft consists of two circular ring fixing parts and a rotating part mounted on the circular ring fixing parts. The circular ring fixing parts are welded to the outer wall of the series-connected long pipe. The rotating part is circular, with its inner wall protruding outward in the middle section to form a boss structure, making the cross-section of the rotating part T-shaped. The two sides of the boss structure overlap the two circular ring fixing parts respectively, and the boss structure is located between the two circular ring fixing parts. The inner diameter formed by the boss structure is slightly larger than that of the series-connected long pipe. The inner wall surface of the rotating part's boss structure is provided with... The helical gears, matched with the drive unit gears, allow the rotating parts to rotate under the drive of the drive unit, thereby causing the entire adjustment module to rotate around the series-connected long tube. The lifting device consists of a connecting shaft, a telescopic column, and a buffer spring. The connecting shaft is fixed on the central rotating shaft, and the telescopic column can extend and retract under the control of the display console. One end of the telescopic column is fixedly connected to the connecting shaft, and the other end is connected to the buffer spring. The other end of the buffer spring is fixed in the clamping body on the inner wall of the long arc-shaped truncated cone. The buffer spring can reduce the impact force on the long arc-shaped truncated cone when the coal wall is broken and damaged, thereby improving the continuous operation capability of the device.

[0008] Furthermore, the long arc frustum is a thin arc-shaped plate. Two of the four long arc frustums are arranged horizontally and two are arranged vertically. The two ends of the horizontally arranged long arc frustums are provided with convex sealing strips, and the vertically arranged long arc frustums are provided with matching concave sealing strips. The convex and concave sealing strips can be tightly closed and sealed. When the four long arc frustums are completely fitted together, they form a cylinder with a radius equal to the radius of the extraction borehole. The horizontally arranged long arc frustums are provided with long bend pipe interfaces and vertical through holes penetrating the long arc frustums at positions corresponding to the long bend pipe interfaces of the series long pipes. The long bend pipes are connected between the two corresponding long bend pipe interfaces of the series long pipes and the long arc frustums.

[0009] Preferably, the long curved pipe is made of a high-strength and flexible material, and its length is 1.2-1.5 times the radius of the long arc truncated cone.

[0010] Furthermore, the ultrasonic transmitting and receiving module is mounted on a long arc circular platform. The ultrasonic transmitting and receiving module consists of multiple sets of ultrasonic transmitting and receiving receivers, each set of ultrasonic transmitting and receiving receivers arranged in a ring on the long arc circular platform. The ultrasonic transmitting and receiving module is controlled by a microcontroller. During the detection operation, the ultrasonic transmitting and receiving receivers in the same ring uniformly emit ultrasonic waves towards the borehole wall and receive reflected wave signals. Moreover, the multiple sets of transmitting and receiving receivers perform ultrasonic transmitting and receiving operations in sequence.

[0011] Furthermore, the tank body and base of the accumulator are fixed to the inner wall of the series-connected long pipe. The tank body is a hollow cylindrical cavity, storing a coupling agent with good insulation and lubrication properties. The inner wall of the tank body has two inwardly protruding coupling agent discharge pipes. The left side of the coupling agent discharge pipes is connected to the internal space of the tank body. The coupling agent discharge pipes and the coupling agent delivery pipe of the series-connected long pipe are connected through a through hole and a connecting short pipe in the middle of the accumulator. The coupling agent discharge pipe on the right side of the through hole is equipped with a partition seal. The hydraulic telescopic column of the accumulator can extend and retract under the control of the display console. Its two ends are connected to the base and the sealing slider, respectively. The sealing slider is located on the right side of the accumulator. Its cross-section has an arc opening that matches the coupling agent discharge pipe. The sealing slider is connected to the accumulator in a leak-proof and airtight manner and can move along the long axis of the accumulator under the action of the hydraulic telescopic column. The left end face of the accumulator is equipped with a filling port. The filling port is equipped with a one-way valve to support the connection of external devices to the filling port to replenish the coupling agent of the accumulator.

[0012] Furthermore, the support module consists of a connector, hydraulic cylinders, long rollers, and a detector; the connector fixes the auxiliary support to both ends of the series-connected long pipe; two hydraulic cylinders are staggered on both sides of the connector, and the hydraulic cylinders can extend and retract under the operation of the display and control console; the other end of the hydraulic cylinder is connected to the long roller, which can roll forward or backward on the borehole wall under manual pushing and pulling; the front end of the connector is equipped with a detector, which can calibrate the relative position of each set of ultrasonic transmitters and receivers with the borehole, and transmit the relevant data to the display and control console.

[0013] Furthermore, the series-connected long tube has a communication port at the helical tooth meshing point on the inner wall of the drive device gear and the central rotating shaft rotating component for mutual meshing. The rotating motor drives the transmission shaft to rotate, and then the helical tooth meshing drives the rotating component to rotate on the two ring fixing components, thereby driving the adjustment module to rotate around the series-connected long tube.

[0014] The present invention provides a dynamic detection device for borehole fractures based on a recyclable borehole sealer, the method of using which includes the following steps:

[0015] a. Tighten and fix the series-connected long pipe of the borehole fracture dynamic detection device to the extraction pipe opening;

[0016] b. Connect the downhole power supply and adjust the length of the hydraulic column of the support module through the display and control console. When the distance from the center point of the connecting body to the edge of the long roller is equal to the radius of the extraction borehole, stop the extension and retraction of the hydraulic column. The operator sends the borehole fracture dynamic detection device, the retrievable sealing device and the extraction pipe into the borehole. During this process, the detector on the support module transmits the relative position of the borehole fracture dynamic detection device and the borehole to the display and control console until the predetermined extraction position of the extraction borehole is reached, and the extraction borehole is sealed with the retrievable sealing device.

[0017] c. After the sealing is completed, the telescopic column of the lifting component of the control module is operated on the display console so that the four long arc truncated cones are completely merged into a cylinder. At this time, the long arc truncated cones are attached to the wall of the extraction borehole.

[0018] d. Start the accumulator via the display and control console. The hydraulic column of the accumulator extends, thereby pushing the sealing slider to compress the coupling agent in the accumulator. The coupling agent flows into the outer wall of the long arc-shaped platform through the coupling agent discharge pipe, connecting short pipe, coupling agent delivery flat pipe, long bend pipe, and vertical through hole on the long arc-shaped platform, filling the space between the long arc-shaped platform and the borehole wall. Control the drive device via the display and control console to drive the adjustment module to rotate 90° clockwise and counterclockwise around the series long pipe multiple times, fully filling the gap between the long arc-shaped platform and the borehole with coupling agent material. Then control the adjustment module to return to the initial position.

[0019] e. Initiate gas extraction operations and simultaneously conduct dynamic detection of borehole fractures. The first ring of ultrasonic transmitters and receivers in the transmission and reception module is controlled by the display and control console to transmit and receive ultrasonic waves. The received acoustic signals are converted into current signals by a transducer. The display and control console receives and analyzes these current signals to obtain the fracture conditions at the corresponding locations of the ultrasonic transmitters and receivers within the borehole. Subsequently, the second, third, and subsequent rings of ultrasonic transmitters and receivers are controlled sequentially to transmit and receive ultrasonic waves, obtaining the fracture conditions at the corresponding locations within the borehole. After all ultrasonic transmitters and receivers have completed their first operation, the above steps are repeated, and the fracture conditions in the borehole are recorded during another time period. This allows for the acquisition of multi-time-period and multi-section borehole fracture development information during the gas extraction operation.

[0020] f. After the gas extraction operation is completed, the telescopic column of the lifting component of the adjustment module is retracted by controlling the display and control console, so that the long arc truncated cone moves towards the central axis in sequence, completing the recovery operation of the adjustment module. Then, the retrievable plug and the crack dynamic detection device are retrieved to end the detection operation.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This invention innovatively develops a dynamic detection device for borehole fractures, which can dynamically detect and record the fracture conditions of the borehole coal wall in multiple sections and at multiple time periods during the gas drainage process, providing new ideas for in-depth scientific research and intelligent and visualized development of gas drainage operations.

[0024] 2. This device uses an adjustment module to ensure that the detection device fits snugly against the borehole wall. It also abandons the traditional water-sealing detection method and uses a coupling agent to seal the gap between the dynamic detection device for borehole fractures and the borehole wall, which can improve the accuracy of the detection operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the dynamic detection device for borehole fractures provided by the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the device of the present invention in borehole sealing and gas extraction operations.

[0027] Figure 3 This is a schematic diagram of the installation structure of the series-connected long pipe, regulating module and accumulator of the device of the present invention.

[0028] Figure 4 This is a schematic diagram of the threaded connection between the series-connected long pipe and the extraction pipe of the device of the present invention.

[0029] Figure 5 This is a schematic diagram of the support module of the device of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the long roller of the support module of the device of the present invention and the wall of the extraction borehole.

[0031] Figure 7 This is a schematic diagram illustrating the structure and working principle of the adjustment module in the device of the present invention.

[0032] Figure 8 This is a schematic diagram of the structure of the adjusting lifting component in the device of the present invention.

[0033] Figure 9 This is a schematic diagram of the structure of the buffer spring of the device of the present invention being secured in the card body.

[0034] Figure 10 This is a schematic diagram of the pressure accumulator in the device of the present invention.

[0035] Figure 11 This is a side view of the sealing slider of the pressure accumulator of the device of the present invention.

[0036] Figure 12 This is a structural diagram of the drive device and the central rotating shaft of the device of the present invention.

[0037] Figure 13 This is a schematic diagram of the structure of the central rotating shaft of the device of the present invention.

[0038] Figure 14 This is a schematic diagram of the structure of the device of the present invention, which consists of a series of long tubes and a central rotating shaft.

[0039] Figure 15 This is a structural diagram of the rotating component of the device of the present invention.

[0040] In the diagram: 1. Connecting long pipe; 1-1. External thread; 1-2. Long groove; 1-3. Coupling agent delivery flat pipe; 2. Adjustment module; 2-1. Adjustment and lifting component; 2-11. Central rotating shaft; 2-111. Circular fixing component; 2-112. Rotating component; 2-12. Lifting device; 2-13. Connecting shaft; 2-14. Telescopic column; 2-15. Buffer spring; 2-16. Locking body; 2-17. Drive device; 2-171. Rotating motor; 2-172. Transmission shaft; 2-173. Gear; 2-2. Long arc truncated cone; 3. Ultrasonic transmitter and receiver; 4. Microcontroller; 5. Pressure accumulator; 5-1. Tank body; 5-2. Base; 5-3. Hydraulic telescopic column; 5-4. Sealing slider; 5-5. Coupling agent discharge pipe; 5-6. Through hole; 5-7. Injection interface; 5-8. Arc opening; 6. Support module; 6-1. Connector; 6-2. Hydraulic column; 6-3. Long roller; 6-4. Detector; 7. Transducer; 8. Signal control cable; 9. Display and control console; 10. Downhole power supply; 11. Long bend pipe. Detailed implementation method:

[0041] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1-15As shown, the present invention provides a dynamic detection device for borehole fractures based on a recyclable borehole sealer, comprising a series-connected long tube 1, an adjustment module 2, an ultrasonic transmitting and receiving module 3, a microcontroller 4, a pressure accumulator 5, a support module 6, a drive device 2-17, a transducer 7, a signal control cable 8, and a display and control console 9. The series-connected long tube 1 is a rigid hollow long tube, with a support module 6 fixed on each of its left and right sides. The adjustment module 2 consists of two sets of adjusting and lifting components 2-1 and four long arc-shaped truncated cones 2-2, with the ultrasonic transmitting and receiving module 3 mounted on the long arc-shaped truncated cones. The drive device 2-17 consists of a rotating motor 2-171, a transmission shaft 2-172 connected to the rotating motor, and a gear 2-173 mounted on the front end of the transmission shaft with a helical tooth structure on its surface. 7 is installed inside the series-connected long pipe and connected to the adjustment module 2. The drive device 2-17 can drive the adjustment module 2 to rotate around the series-connected long pipe 1. The pressure accumulator 5 consists of a tank 5-1, a base 5-2, a hydraulic telescopic column 5-3, and a sealing slider 5-4. The pressure accumulator 5 is installed and fixed in the middle position inside the series-connected long pipe 1. A single-chip microcomputer 4 and a transducer 7 are also installed on the right side of the pressure accumulator. The display and control console 9 is connected to the adjustment module 2, pressure accumulator 5, single-chip microcomputer 4, ultrasonic transmitting and receiving module 3, drive device 2-17, and support module 6 through a signal control cable 8. The display and control console 9 can control the opening, closing, and operation of the adjustment module 2, pressure accumulator 5, single-chip microcomputer 4, ultrasonic transmitting and receiving module 3, drive device 2-17, and support module 6, and can also store, analyze, and display detection data. When the borehole fracture dynamic detection device is not in the detection operation state, the lifting component of the adjustment module 2 is in the retracted state to ensure that the borehole fracture dynamic detection device can smoothly enter the extraction borehole.

[0044] The outer diameter of the series-connected long pipe 1 matches the inner diameter of the extraction pipe. The left side of the series-connected long pipe 1 is provided with an external thread 1-1 that matches the internal thread of the extraction pipe port. Two long holes 1-2 are opened on the left side of the series-connected long pipe 1 as air intake channels for the extracted gas. A pressure accumulator 5 is installed in the middle part of the series-connected long pipe 1. Two coupling agent delivery flat pipes 1-3 are also provided on the inner wall of the series-connected long pipe 1. The middle position of the inner side of the coupling agent delivery flat pipe 1-3 is connected to the coupling agent discharge pipe of the pressure accumulator 5 by a connecting short pipe. The middle position and both ends of the outer side of the coupling agent delivery flat pipe 1-3 are provided with long bend pipe interfaces and connected to long bend pipe 11.

[0045] The adjusting lifting component 2-1 consists of a central rotating shaft 2-11 and four vertically arranged lifting devices 2-12. The central rotating shaft 2-11 consists of two circular ring fixing parts 2-111 and rotating parts 2-112 mounted on the circular ring fixing parts. The circular ring fixing parts 2-111 are welded to the outer wall of the connected long pipe 1. The rotating parts 2-112 are circular, with the middle section of their inner wall protruding outward to form a boss structure, making the cross-section of the rotating parts T-shaped. The two sides of the boss structure overlap the two circular ring fixing parts 2-111 respectively. The boss structure is located between the two circular ring fixing parts 2-111, and the inner diameter formed by the boss structure is slightly larger than that of the connected long pipe. The inner wall surface of the rotating part's boss structure is provided with gears that match the drive device. The helical gear and rotating component 2-112 can rotate under the drive of the drive device, thereby driving the entire adjustment module 2 to rotate around the series-connected long pipe 1; the lifting device 2-12 consists of a connecting shaft 2-13, a telescopic column 2-14 and a buffer spring 2-15. The connecting shaft 2-13 is fixed on the central rotating shaft 2-11. The telescopic column 2-14 can perform telescopic movement under the control of the display and control console 9. One end of the telescopic column 2-14 is fixedly connected to the connecting shaft 2-13, and the other end is connected to the buffer spring 2-15. The other end of the buffer spring 2-15 is fixed in the card 2-16 on the inner wall of the long arc truncated cone 2-2. The buffer spring 2-15 can reduce the impact force on the long arc truncated cone when the coal wall is broken and damaged, and improve the continuous operation capability of the device.

[0046] The long arc truncated cone 2-2 is a thin arc-shaped plate. Two of the four long arc truncated cones 2-2 are arranged horizontally and two are arranged vertically. The two ends of the horizontally arranged long arc truncated cones are provided with convex sealing strips, and the vertically arranged long arc truncated cones are provided with matching concave sealing strips. The convex and concave sealing strips can be tightly closed and sealed. When the four long arc truncated cones 2-2 are completely fitted together, they form a cylinder. The radius of the cylinder is equal to the radius of the extraction borehole. The horizontally arranged long arc truncated cones 2-2 are also provided with long bend pipe interfaces and vertical through holes penetrating the long arc truncated cones at the corresponding positions of the long bend pipe interfaces on the series long pipe 1. The two corresponding long bend pipe interfaces of the series long pipe 1 and the long arc truncated cones 2-2 are connected by long bend pipes 11.

[0047] The long curved pipe 11 is made of a high-strength and flexible material, and its length is 1.2-1.5 times the radius of the long arc frustum 2-2.

[0048] The ultrasonic transmitting and receiving module is installed on the long arc frustum 2-2. The ultrasonic transmitting and receiving module consists of multiple sets of ultrasonic transmitting and receiving receivers 3. Each set of ultrasonic transmitting and receiving receivers 3 is arranged in a ring on the long arc frustum 2-2. During the detection operation, the ultrasonic transmitting and receiving module is controlled by the microcontroller 4. The ultrasonic transmitting and receiving receivers 3 in the same ring emit ultrasonic waves to the borehole wall and receive reflected wave signals. The multiple sets of transmitting and receiving receivers carry out ultrasonic transmitting and receiving operations in sequence.

[0049] The pressure accumulator 5 consists of a tank 5-1, a base 5-2, a hydraulic telescopic column 5-3, and a sealing slider 5-4. The tank 5-1 and the base 5-2 are fixed to the inner wall of the series-connected long pipe 1. The tank 5-1 is a hollow cylindrical cavity containing a coupling agent with good insulation and lubrication. Two inwardly protruding coupling agent discharge pipes 5-5 are provided on the inner wall of the tank 5-1. The left side of the coupling agent discharge pipes 5-5 communicates with the internal space of the tank 5-1. The coupling agent discharge pipes 5-5 and the coupling agent delivery pipe 1-3 of the series-connected long pipe 1 are connected through a through hole 5-6 in the middle of the pressure accumulator 5 and a connecting short pipe. The coupling agent discharge pipe on the right side of the through hole... The outlet pipe 5-5 is equipped with a partition seal; the hydraulic telescopic column 5-3 can extend and retract under the control of the display console 9, and its two ends are connected to the base 5-2 and the sealing slider 5-4 respectively; the sealing slider 5-4 is located on the right side of the accumulator 5, and its cross-section is provided with an arc-shaped opening 5-8 that matches the coupling agent outlet pipe 5-5. The sealing slider 5-4 is connected to the accumulator 5 in a leak-proof and airtight manner and can move along the long axis of the accumulator 5 under the action of the hydraulic telescopic column 5-3; the left end face of the accumulator 5 is provided with an injection port 5-7, and the injection port 5-7 is provided with a one-way valve to support the connection of external devices to the injection port 5-7 to replenish the coupling agent in the accumulator 5.

[0050] The support module 6 consists of a connector 6-1, hydraulic cylinders 6-2, long rollers 6-3, and a detector 6-4. The connector 6-1 fixes the auxiliary support to both ends of the series-connected long pipe 1. The two hydraulic cylinders 6-2 are staggered on both sides of the connector 6-1, and the hydraulic cylinders 6-2 can extend and retract under the operation of the display and control console 9. The other end of the hydraulic cylinder 6-2 is connected to the long roller 6-3, which can roll forward or backward on the borehole wall under manual pushing and pulling. The front end of the connector 6-1 is equipped with a detector 6-4, which can calibrate the relative position of each group of ultrasonic transmitters and receivers 3-1 with the borehole and transmit the relevant data to the display and control console 9.

[0051] The series-connected long tube 1 has a communication port at the helical tooth meshing point on the inner wall of the gear 2-173 of the drive device 2-17 and the rotating part 2-172 of the central rotating shaft 2-11 for mutual meshing. The rotating motor 2-171 can drive the transmission shaft 2-172 to rotate, and then drive the rotating part to rotate on the two ring fixing parts 2-111 through the helical tooth meshing, thereby driving the adjustment module 2 to rotate around the series-connected long tube 1.

[0052] Example 2

[0053] The method for dynamic detection of borehole fractures based on a recyclable borehole sealer provided by the present invention includes the following steps:

[0054] a. Tighten and fix the series long pipe 1 of the borehole fracture dynamic detection device to the extraction pipe opening;

[0055] b. Connect the downhole power supply 10, and adjust the length of the hydraulic column 6-2 of the support module 6 through the display and control console 9. When the distance from the center point of the connecting body 6-1 to the edge of the long roller 6-3 is equal to the radius of the extraction borehole, stop the extension and retraction of the hydraulic column 6-2. Then, the operator sends the borehole fracture dynamic detection device, the retrievable sealing device and the extraction pipe into the borehole. During this process, the detector 6-4 on the support module 6 transmits the relative position of the borehole fracture dynamic detection device and the borehole to the display and control console 9 until the predetermined extraction position of the extraction borehole is reached, and the extraction borehole is sealed with the retrievable sealing device.

[0056] c. After the sealing is completed, the telescopic column 2-14 of the lifting component of the control module 2 on the display console 9 is used to make the four long arc truncated cones 2-2 completely merge into a cylinder. At this time, the long arc truncated cones 2-2 are attached to the wall of the extraction borehole.

[0057] d. Start the accumulator 5 via the display and control console 9. The hydraulic column of the accumulator 5 extends, thereby pushing the sealing slider 5-4 to compress the coupling agent in the accumulator 5. The coupling agent flows into the outer wall of the long arc frustum 2-2 through the coupling agent discharge pipe 5-5, the connecting short pipe, the coupling agent delivery flat pipe 1-3, the long bend pipe 11, and the vertical through hole on the long arc frustum 2-2, filling the space between the long arc frustum 2-2 and the borehole wall. Control the drive device 2-17 via the display and control console 9 to drive the adjustment module 2 to rotate 90° clockwise and counterclockwise around the series long pipe 1 multiple times, so as to fully fill the gap between the long arc frustum and the borehole with coupling agent. Then control the adjustment module to return to the initial position.

[0058] e. Initiate gas extraction operations and simultaneously conduct dynamic detection of borehole fractures. Control the first ring of ultrasonic transmitters and receivers 3 in the transmission and reception module via the display and control console 9 to transmit and receive ultrasonic waves. Convert the received acoustic signals into current signals via the transducer 7. The display and control console 9 receives the current signals, analyzes and processes them to obtain the fracture conditions at the corresponding positions of the ultrasonic transmitters and receivers 3 in the borehole. Subsequently, control the second ring, third ring, and so on ultrasonic transmitters and receivers 3 in sequence to transmit and receive ultrasonic waves, and obtain the fracture conditions at the corresponding positions in the borehole in sequence. After all ultrasonic transmitters and receivers 3 have completed their first operation, repeat the above steps and record the fracture conditions in the borehole during another time period. This allows us to obtain the multi-time period and multi-section borehole fracture development during the gas extraction operation.

[0059] f. After the gas extraction operation is completed, the telescopic column 2-14 of the lifting component of the adjustment module 2 is retracted by controlling the display and control console 9, so that the long arc truncated cone 2-2 moves towards the central axis in sequence, completing the recovery operation of the adjustment module 2. Then, the recyclable plug and the crack dynamic detection device are retrieved to end the detection operation.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dynamic detection device for borehole fractures based on a recyclable borehole sealer, characterized in that: It consists of a series-connected long tube, an adjustment module, an ultrasonic transmitting and receiving module, a microcontroller, a voltage accumulator, a support module, a drive device, a transducer, a signal control cable, and a display and control console. The series-connected long tube is a rigid hollow tube with a support module fixed on each of its left and right sides. The adjustment module is installed on the outer side of the middle of the series-connected long tube and consists of two sets of adjusting and lifting components and four long arc-shaped truncated cones, on which the ultrasonic transmitting and receiving modules are mounted. The drive device consists of a rotating motor, a drive shaft connected to the rotating motor, and a gear with helical teeth on its surface installed at the front end of the drive shaft. The drive device is installed inside the series-connected long tube. It is connected to the regulating module, and the drive device can drive the regulating module to rotate around the series-connected long pipe; the pressure accumulator consists of a tank, a base, a hydraulic telescopic column, and a sealing slider, and the pressure accumulator is installed and fixed in the middle position inside the series-connected long pipe; a microcontroller and a transducer are also installed on the right side of the pressure accumulator; the display and control console is connected to the regulating module, pressure accumulator, microcontroller, ultrasonic transmitting and receiving module, drive device, and support module through a signal control cable. The display and control console can control the opening, closing, and operation of the regulating module, pressure accumulator, microcontroller, ultrasonic transmitting and receiving module, drive device, and support module, and at the same time store, analyze, and display the detection data.

2. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The outer diameter of the series-connected long pipe matches the inner diameter of the extraction pipe. The left side of the series-connected long pipe is provided with an external thread that matches the internal thread of the extraction pipe port. Two elongated slots are opened on the left side of the series-connected long pipe as air intake channels for the extracted gas. A pressure accumulator is installed in the middle part of the series-connected long pipe. Two coupling agent delivery flat pipes are provided on the inner wall of the series-connected long pipe. The middle part of the inner side of the coupling agent delivery flat pipe is connected to the coupling agent discharge pipe of the pressure accumulator by a connecting short pipe. The middle part and both ends of the outer side of the coupling agent delivery flat pipe are provided with long bend pipe interfaces that are connected to the long bend pipes.

3. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The adjusting and lifting component consists of a central rotating shaft and four vertically arranged lifting devices. The central rotating shaft comprises two circular ring fixing parts and a rotating part mounted on the circular ring fixing parts. The circular ring fixing parts are welded to the outer wall of the series-connected long pipe. The rotating part is circular, with its inner wall protruding outward in the middle section to form a boss structure, making the cross-section of the rotating part T-shaped. The two sides of the boss structure overlap the two circular ring fixing parts respectively. The boss structure is located between the two circular ring fixing parts, and the inner diameter formed by the boss structure is slightly larger than that of the series-connected long pipe. The inner wall surface of the rotating part's boss structure is provided with a drive mechanism. The drive device has matching helical gears, and the rotating parts can rotate under the drive of the drive device, which in turn drives the adjustment module to rotate around the series-connected long tube. The lifting device consists of a connecting shaft, a telescopic column, and a buffer spring. The connecting shaft is fixed on the central rotating shaft, and the telescopic column can move in and out under the control of the display console. One end of the telescopic column is fixedly connected to the connecting shaft, and the other end is connected to the buffer spring. The other end of the buffer spring is fixed in the clamping body on the inner wall of the long arc-shaped truncated cone. The buffer spring can reduce the impact force on the long arc-shaped truncated cone when the coal wall is broken and damaged, and improve the continuous operation capability of the device.

4. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The long arc truncated cone is a thin arc-shaped plate. Two of the four long arc truncated cones are arranged horizontally and two are arranged vertically. The two ends of the horizontally arranged long arc truncated cones are provided with convex sealing strips, and the vertically arranged long arc truncated cones are provided with matching concave sealing strips. The convex and concave sealing strips can be tightly closed and sealed. When the four long arc truncated cones are completely fitted together, they form a cylinder with a radius equal to the radius of the extraction borehole. The horizontally arranged long arc truncated cones are provided with long bend pipe interfaces and vertical through holes penetrating the long arc truncated cones at positions corresponding to the long bend pipe interfaces of the series long pipe. The long bend pipes are connected between the two corresponding long bend pipe interfaces of the series long pipe and the long arc truncated cones.

5. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 4, characterized in that: The long curved pipe is made of a high-strength and flexible material, and its length is 1.2-1.5 times the radius of the long arc truncated cone.

6. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The ultrasonic transmitting and receiving module consists of multiple sets of ultrasonic transmitting and receiving receivers, each set arranged in a ring on a long arc-shaped platform. The ultrasonic transmitting and receiving module is controlled by a microcontroller. During the detection operation, the ultrasonic transmitting and receiving receivers in the same ring emit ultrasonic waves toward the borehole wall and receive reflected wave signals. The multiple sets of transmitting and receiving receivers perform ultrasonic transmitting and receiving operations in sequence.

7. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The accumulator's tank and base are fixed to the inner wall of the series-connected long pipe. The tank is a hollow cylindrical cavity containing a coupling agent with good insulation and lubrication properties. Two inwardly protruding coupling agent outlet pipes are located on the inner wall of the tank. The left side of the coupling agent outlet pipes communicates with the internal space of the tank. The coupling agent outlet pipes and the coupling agent delivery pipe on the series-connected long pipe are connected through a through-hole and a connecting short pipe in the middle of the accumulator. The coupling agent outlet pipe on the right side of the through-hole is sealed. The accumulator's hydraulic telescopic column can extend and retract under the control of the display console. Its two ends are connected to the base and the sealing slider, respectively. The sealing slider is located on the right side of the accumulator and has an arc-shaped opening on its cross-section that matches the coupling agent outlet pipe. The sealing slider is connected to the accumulator in a leak-proof and airtight manner and can move along the long axis of the accumulator under the action of the hydraulic telescopic column. A filling port is located on the left end face of the accumulator, containing a one-way valve to support external devices connecting to the filling port for replenishing the accumulator with coupling agent.

8. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The support module consists of a connector, hydraulic cylinders, long rollers, and a detector. The connector fixes the auxiliary support to both ends of the series-connected long pipe. Two hydraulic cylinders are staggered on both sides of the connector, and the hydraulic cylinders can extend and retract under the operation of the display and control console. The other end of the hydraulic cylinder is connected to the long roller, which can roll forward or backward on the borehole wall under manual pushing and pulling. The front end of the connector is equipped with a detector, which can calibrate the relative position of each set of ultrasonic transmitters and receivers with the borehole and transmit the relevant data to the display and control console.

9. The dynamic detection device for borehole fractures based on a recyclable borehole sealer according to claim 1, characterized in that: The series-connected long tube has a communication port at the meshing point of the helical teeth on the inner wall of the drive device gear and the central rotating shaft rotating component for mutual engagement. The rotating motor drives the transmission shaft to rotate, and then the helical teeth meshing drives the rotating component to rotate on the two ring fixing components, thereby driving the adjustment module to rotate around the series-connected long tube.

10. The method of using the dynamic detection device for borehole fractures based on a recyclable borehole sealer according to any one of claims 1-9, characterized in that, Includes the following steps: a. Tighten and fix the series-connected long pipe of the borehole fracture dynamic detection device to the extraction pipe opening; b. Connect the downhole power supply and adjust the length of the hydraulic column of the support module through the display and control console. When the distance from the center point of the connecting body to the edge of the long roller is equal to the radius of the extraction borehole, stop the extension and retraction of the hydraulic column. The operator sends the borehole fracture dynamic detection device, the retrievable sealing device and the extraction pipe into the borehole. During this process, the detector on the support module transmits the relative position of the borehole fracture dynamic detection device and the borehole to the display and control console until the predetermined extraction position of the extraction borehole is reached, and the extraction borehole is sealed with the retrievable sealing device. c. After the sealing is completed, the telescopic column of the lifting component of the control module is operated on the display console so that the four long arc truncated cones are completely merged into a cylinder. At this time, the long arc truncated cones are attached to the wall of the extraction borehole. d. Start the accumulator via the display and control console. The hydraulic column of the accumulator extends, thereby pushing the sealing slider to compress the coupling agent in the accumulator. The coupling agent flows into the outer wall of the long arc-shaped platform through the coupling agent discharge pipe, connecting short pipe, coupling agent delivery flat pipe, long bend pipe, and vertical through hole on the long arc-shaped platform, filling the space between the long arc-shaped platform and the borehole wall. Control the drive device via the display and control console to drive the adjustment module to rotate 90° clockwise and counterclockwise around the series long pipe multiple times, fully filling the gap between the long arc-shaped platform and the borehole with coupling agent material. Then control the adjustment module to return to the initial position. e. Initiate gas extraction operations and simultaneously conduct dynamic detection of borehole fractures. The first ring of ultrasonic transmitters and receivers in the transmission and reception module is controlled by the display and control console to transmit and receive ultrasonic waves. The received acoustic signals are converted into current signals by a transducer. The display and control console receives and analyzes these current signals to obtain the fracture conditions at the corresponding locations of the ultrasonic transmitters and receivers within the borehole. Subsequently, the second and third rings of ultrasonic transmitters and receivers are controlled sequentially to transmit and receive ultrasonic waves, obtaining the fracture conditions at the corresponding locations within the borehole. After all ultrasonic transmitters and receivers have completed their first operation, the above steps are repeated, and the fracture conditions in the borehole are recorded during another time period. This allows for the acquisition of multi-time-period and multi-section borehole fracture development information during the gas extraction operation. f. After the gas extraction operation is completed, the telescopic column of the lifting component of the adjustment module is retracted by controlling the display and control console, so that the long arc truncated cone moves towards the central axis in sequence, completing the recovery operation of the adjustment module. Then, the retrievable plug and the crack dynamic detection device are retrieved to end the detection operation.

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