An integrated drilling and packer system and method with dynamic sealing - flexible spraying

Abstract

The present invention discloses a drilling integrated sealing system and method with dynamic sealing - flexible spraying. First, the grouting device is used to grout and expand two plugging bags to form a sealed space between them, and flexible hole - sealing slurry is injected into the sealed space to make it enter the borehole fissures. The spraying device is used to spray flexible spraying material on the roadway surface outside the borehole to achieve the primary sealing and spraying work. After completion, gas drainage is carried out on the borehole. During the gas drainage process, the gas drainage borehole sealing quality detection device collects the gas in the borehole in real - time for data detection, and analyzes and processes it in combination with the set threshold to judge the borehole sealing quality. If the sealing quality decreases, the grouting device and the spraying device work to achieve re - sealing and spraying of the borehole. And during the subsequent gas drainage process, according to the real - time judged borehole quality, the dynamic hole - sealing process of first sealing - then spraying can be continuously carried out, so as to ensure the efficiency of gas drainage.

Description

Technical Field

[0001] The present invention relates to an integrated sealing system and method for drilling with dynamic sealing - flexible spraying, belonging to the technical field of coal mine gas drainage. Background Art

[0002] Gas drainage operations play a crucial role in the safe production of high - gas outburst mines. By drilling holes into the coal seam to drain gas, the gas content in the coal seam can be reduced, thereby reducing the likelihood of coal - and - gas outburst or gas explosion accidents. However, under the action of mining stress disturbance, traditional solid plugging materials and coal bodies will crack in gas drainage boreholes, forming air leakage channels, resulting in low gas drainage efficiency. In severe cases, it may even lead to the failure of gas drainage boreholes. Currently, the technologies for sealing gas drainage boreholes mainly focus on sealing with cement - based materials or polyurethane materials. Although these methods have a certain sealing effect, under deep high - stress conditions, due to coal body deformation, borehole deformation, and uneven stress distribution, traditional solid sealing materials are difficult to adapt to deformation and pressure changes, resulting in crack development or poor borehole sealing, which seriously affects the gas drainage effect. In addition, the current sealing technologies are mostly "passive" sealing, that is, the sealing is achieved by compression after the sealing material solidifies. This method is difficult to adapt to borehole deformation and the change of mining disturbance stress distribution and cannot adjust the sealing situation in a timely manner.

[0003] Therefore, how to provide a new sealing system and method that can provide dynamic adaptability and efficient flexible spraying sealing performance during the borehole sealing process, so as to adapt to borehole deformation and the change of mining disturbance stress distribution, and ensure effective gas drainage in a complex geostress environment. Summary of the Invention

[0004] Aiming at the problems existing in the above - mentioned prior art, the present invention provides an integrated sealing system and method for drilling with dynamic sealing - flexible spraying, which can provide both dynamic adaptability and efficient flexible spraying sealing performance during the borehole sealing process, so as to adapt to borehole deformation and the change of mining disturbance stress distribution, ensure better sealing quality of boreholes under complex geostress environments, and ultimately achieve efficient gas drainage from boreholes.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an integrated sealing system for drilling with dynamic sealing - flexible spraying, comprising a gas extraction and sealing device, a gas drainage borehole sealing quality detection device, an intelligent control system, a grouting device, and a spraying device;

[0006] The gas extraction and sealing device comprises a gas extraction pipe, a gas extraction pipe and two sealing bags. The gas extraction pipe is installed in the borehole and is used to extract gas inside the borehole. The two sealing bags are installed outside the gas extraction pipe and are used to seal between the borehole and the gas extraction pipe and form a sealed space between the two sealing bags. One end of the gas extraction pipe passes through the gas extraction pipe and extends into the borehole, and the other end is outside the borehole and is used to collect gas at the end of the gas extraction pipe inside the borehole.

[0007] The gas extraction borehole sealing quality detection device comprises a shell, a micro extraction pump, a gas detection module, a sealing quality determination module and an air pipe, wherein an air inlet and an air outlet are respectively arranged on both sides of the shell, the air pipe is installed in the shell and its two ends are respectively connected to the air inlet and the air outlet, the gas extraction pipe is connected to the air pipe through the air inlet from the outside, and is used to transport the collected gas into the air pipe; the micro extraction pump is installed on the air pipe, and is used to provide extraction negative pressure inside the air pipe; the gas detection module is installed on the air pipe, and is used to detect the gas composition and concentration flowing through the air pipe; the sealing quality determination module is connected to the gas detection module, and is used to obtain the detection data of the gas detection module, and then analyze and process it to determine the sealing quality of the borehole;

[0008] The grouting device comprises a first grouting pipe, a second grouting pipe, a grouting pump group and a grouting container group, one end of the first grouting pipe passes through a blocking bag near the orifice and extends into the other blocking bag, and the first grouting pipe inside the two blocking bags is provided with a first grouting port, one end of the second grouting pipe passes through a blocking bag near the orifice and extends into the sealed space, and the second grouting pipe in the sealed space is provided with a second grouting port; the grouting pump group comprises a first grouting pump and a second grouting pump, and the grouting container group comprises a first grouting container and The second slurry storage container, the first slurry storage container is connected to the other end of the first grouting pipe through the first grouting pump, and is used to transport the slurry in the first slurry storage container to the two sealing bags after being pressurized by the first grouting pump to make them expand and seal; the second slurry storage container is connected to the other end of the second grouting pipe through the second grouting pump, and is used to transport the slurry in the second slurry storage container to the sealed space for water sealing after being pressurized by the second grouting pump; the first slurry storage container contains cement slurry containing an expansion agent, and the second slurry storage container contains flexible sealing slurry;

[0009] The spraying device includes a storage tank and a spray gun. The storage tank contains a flexible spray material. The storage tank is connected to the spray gun through a liquid infusion tube and is used to spray the flexible spray material to the tunnel wall outside the drill hole through the spray gun.

[0010] The intelligent control system includes a PLC controller, a display device, a spraying warning device, a first pressure sensor, a second pressure sensor, a first control valve, and a second control valve. The first pressure sensor and the second pressure sensor are respectively installed on the first grouting pipe and the second grouting pipe to monitor the pressure in the first grouting pipe and the pressure in the second grouting pipe. The first control valve and the second control valve are respectively installed on the first grouting pipe and the second grouting pipe to control the on-off of the first grouting pipe and the second grouting pipe. The PLC controller is connected to the gas drainage borehole sealing quality detection device, the display device, the spraying warning device, the grouting pump set, the first pressure sensor, the second pressure sensor, the first control valve, and the second control valve, and is used to receive the data fed back by the gas drainage borehole sealing quality detection device, the first pressure sensor, and the second pressure sensor. According to the feedback of the sealing quality, it controls the states of the grouting pump set and the spraying warning device and the opening and closing of the first control valve and the second control valve, and at the same time transmits the gas drainage borehole sealing quality, pressure data, the grouting pump set, the spraying warning device, the first control valve, and the second control valve to the display device for display. The spraying warning device is provided with a voice signal reminder, which is used to remind the operator to start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole.

[0011] Further, the gas extraction pipe is composed of multiple hollow pipes with a length of 1 m and a diameter of 20 mm, which are coaxially connected through sealed threads. The length of the gas extraction pipe is adjusted according to the borehole depth. The hollow pipe is made of aluminum-plastic material.

[0012] Further, the gas extraction pipe outside the borehole is connected to the main extraction pipeline through a tee. One end of the gas extraction pipe is equipped with a filter screen to prevent coal dust from entering the gas extraction pipe and blocking the pipeline. The other end of the gas extraction pipe extends out of the tee and is provided with a valve switch to control the on-off of the gas extraction pipe.

[0013] Further, the gas detection module includes an oxygen concentration sensor, a gas concentration sensor, a negative pressure sensor, and a flow sensor, which are respectively used to detect the oxygen concentration, gas concentration, air pressure, and flow rate of the gas in the gas pipe. The gas pipe is made of PVC flame-retardant pipe.

[0014] Further, the sealing material is a non-solidifying flexible paste material, and the flexible spraying material is a surface sealing material.

[0015] Further, one-way valves are installed at both the first grouting port and the second grouting port to prevent the slurry from flowing back into the first grouting pipe or the second grouting pipe during grouting.

[0016] The working method of the above-mentioned integrated borehole sealing system with dynamic sealing-flexible spraying is specifically as follows:

[0017] A. Deployment of an integrated sealing system: Place the gas drainage pipe into the gas drainage borehole, and place one end of the gas extraction pipe into the gas drainage pipe, with the other end connected to the air inlet of the gas drainage borehole sealing quality detection device; Prepare cement slurry containing an expansive agent, flexible sealing slurry, and flexible spraying material, and place them into the first slurry storage container, the second slurry storage container, and the material storage tank respectively. Then, connect other components to complete the deployment process of the integrated sealing system;

[0018] B. Sealing with plugging bags: The PLC controller first opens the control valve 1 and starts the first grouting pump, and injects cement slurry containing an expansive agent into the two plugging bags through the first grouting pipe and the grouting port 1. During the grouting process, the two plugging bags continuously expand, gradually supporting the entire borehole and forming a sealed space between the two plugging bags. At the same time, the reading of the pressure sensor 1 on the first grouting pipe continuously changes. When the reading of the pressure sensor 1 gradually stabilizes at 2 MPa, the PLC controller closes the control valve 1 and the first grouting pump to complete the sealing with plugging bags;

[0019] C. Preliminary sealing and spraying: After the cement slurry in the plugging bags solidifies, the PLC controller opens the control valve 2 and starts the second grouting pump, and injects flexible sealing slurry into the sealed space between the two plugging bags through the second grouting pipe. The grouting pressure is not less than the set minimum grouting pressure, so that the flexible sealing slurry can penetrate into the cracks of the borehole surrounding rock to achieve the sealing of the borehole. During this process, the reading of the pressure sensor 2 on the second grouting pipe continuously changes and is continuously fed back to the PLC controller. When the reading of the pressure sensor 2 reaches 1.6 MPa, the PLC controller sends a pulsating cyclic grouting instruction to the second grouting pump, and continues to inject until the reading of the pressure sensor 2 remains stable for 10 minutes. Then, the PLC controller closes the control valve 2 and the second grouting pump to complete the primary sealing of the gas drainage borehole; Subsequently, the PLC controller starts the spraying warning device, and uses voice to remind the operator to start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole. After spraying the entire borehole roadway wall, the primary spraying work is completed;

[0020] D. Dynamic sealing - flexible spraying: After the initial sealing and spraying are completed, connect the gas drainage pipe to the main drainage pipeline and start gas drainage. During the drainage process, use the gas drainage borehole sealing quality detection device to monitor the sealing quality of the borehole in real time. When the sealing quality decreases, the PLC controller starts the borehole sealing program, opens the control valve II and starts the second grouting pump, and injects flexible sealing slurry into the confined space through the second grouting pipe. The grouting pressure is not less than the set minimum grouting pressure. During this process, the reading of the pressure sensor II on the second grouting pipe changes continuously and is continuously fed back to the PLC controller. When the reading of the pressure sensor II reaches 1.6 MPa, the PLC controller sends a pulsating cyclic grouting instruction to the second grouting pump and continues to inject until the reading of the pressure sensor II remains stable for 10 minutes. Then the PLC controller closes the control valve II and the second grouting pump to complete the secondary sealing of the gas drainage borehole. After that, use the gas drainage borehole sealing quality detection device to detect the sealing quality of the borehole again. If the sealing quality of the borehole returns to normal, continue the gas drainage work; if the sealing quality of the borehole still decreases, the PLC controller starts the spraying warning device to voice - remind the operator to start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole. After spraying, continue the gas drainage work; continuously monitor the sealing quality of the borehole and repeat the dynamic sealing process of first sealing - then spraying in a cycle to ensure the efficiency of gas drainage.

[0021] Furthermore, the specific process of the gas drainage borehole sealing quality detection device monitoring the sealing quality of the borehole in real time is as follows:

[0022] Set the oxygen concentration threshold and the gas concentration threshold in the sealing quality determination module. The gas detection module continuously detects the oxygen concentration and gas concentration of the gas extracted from the gas drainage pipe. If the detected oxygen concentration exceeds the oxygen concentration threshold and at the same time the gas concentration is lower than the gas concentration threshold, it indicates that the borehole quality has decreased. At this time, the PLC controller starts the borehole sealing program.

[0023] Compared with the prior art, the present invention combines a gas extraction and sealing device, a gas drainage borehole sealing quality detection device, an intelligent control system, a grouting device, and a spraying device. First, the grouting device is used to grout and expand two plugging bags to seal the borehole, and a sealed space is formed between the two plugging bags. Flexible grouting slurry is injected into the sealed space to make the slurry enter the borehole fissures, realizing the primary sealing. Then, the spraying device is used to spray flexible spraying material on the roadway surface outside the borehole to complete the primary spraying operation. After completion, gas is extracted from the borehole through the gas drainage pipe. During the gas extraction process, the gas drainage borehole sealing quality detection device collects the gas in the borehole in real time through the gas extraction and sealing device. The gas is detected for oxygen concentration and gas concentration by the gas drainage borehole sealing quality detection device and analyzed and processed with the set threshold values, so as to judge the borehole sealing quality. If the sealing quality decreases, the grouting device and the spraying device are controlled to work in sequence to realize the re-sealing and spraying of the borehole. During the subsequent gas extraction process, according to the real-time judged borehole quality, the dynamic sealing process of first sealing and then spraying can be continuously carried out, thus ensuring the efficiency of gas extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2 is the schematic diagram of the dynamic sealing structure of the present invention;

[0026] Figure 3 is the schematic diagram of the structure of the gas drainage borehole sealing quality detection system of the present invention.

[0027] In the figure: 1 - coal seam, 2 - coal seam floor, 3 - gas drainage pipe, 4 - gas extraction pipe, 5 - tee, 6 - valve switch, 7 - filter screen, 8 - gas drainage borehole sealing quality detection device, 9 - micro extraction pump, 10 - gas detection module, 101 - oxygen concentration sensor, 102 - gas concentration sensor, 103 - negative pressure sensor, 104 - flow sensor, 11 - sealing quality determination module, 12 - air pipe, 13 - quick connector, 14 - slurry storage container group, 15 - grouting pump group, 16 - first grouting pipe, 17 - second grouting pipe, 18 - storage tank, 19 - spray gun, 20 - infusion pipe, 21 - plugging bag, 22 - first grouting port, 23 - second grouting port, 24 - sealed space, 25 - PLC controller, 26 - display device, 27 - spraying warning device, 28 - control valve one, 29 - control valve two, 30 - pressure sensor one, 31 - pressure sensor two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be further described below.

[0029] AsFigure 1 and 2 As shown, a borehole integrated isolation system with dynamic sealing-flexible spraying includes a gas extraction and sealing device, a gas extraction borehole sealing quality detection device 8, an intelligent control system, a grouting device and a spraying device;

[0030] The gas extraction and sealing device comprises a gas extraction pipe 3, a gas extraction pipe 4 and two sealing bags 21. The gas extraction pipe 3 is installed in the borehole to extract gas inside the borehole; the two sealing bags 21 are installed outside the gas extraction pipe 3 to seal between the borehole and the gas extraction pipe 3 and to form a sealed space 24 between the two sealing bags 21; one end of the gas extraction pipe 4 passes through the gas extraction pipe 3 and extends into the borehole, and the other end is outside the borehole, and is used to collect gas at the end of the gas extraction pipe inside the borehole;

[0031] like Figure 3 As shown, the gas extraction drilling hole sealing quality detection device 8 includes a shell, a micro extraction pump 9, a gas detection module 10, a sealing quality judgment module 11 and an air pipe 12. The shell is provided with an air inlet and an exhaust port on both sides. The air pipe 12 is installed in the shell and its two ends are respectively connected to the air inlet and the exhaust port. The gas extraction pipe 4 is connected to the air pipe 12 from the outside through a quick-connect connector 13 and the air inlet, and is used to transport the collected gas into the air pipe 12; the micro extraction pump 9 is installed on the air pipe 12, and is used to provide extraction negative pressure to the inside of the air pipe 12; the gas detection module 10 The block 10 is mounted on the trachea 12 and is used to detect the gas composition and concentration flowing through the trachea 12; the sealing quality judgment module 11 is connected to the gas detection module 10 and is used to obtain the detection data of the gas detection module 10 and judge the sealing quality of the borehole after analysis and processing; the gas detection module 10 includes an oxygen concentration sensor 101, a gas concentration sensor 102, a negative pressure sensor 103 and a flow sensor 104, which are respectively used to detect the oxygen concentration, gas concentration, air pressure and flow of the gas in the trachea; the trachea is made of PVC flame-retardant pipe. The measurement range of the oxygen concentration sensor 101 is 0-25%, the measurement range of the gas concentration sensor 102 is 0-100%, the measurement range of the negative pressure sensor 103 is 0-200kPa, and the flow rate measurement range of the flow sensor 104 is 0-30m / s (bidirectional flow rate).

[0032] The grouting device includes a first grouting pipe 16, a second grouting pipe 17, a grouting pump set 15 and a slurry storage container set 14. One end of the first grouting pipe 16 passes through the plugging bladder 21 near the orifice and extends into another plugging bladder 21, and grouting ports one 22 are provided on the first grouting pipe 16 inside both plugging bladders 21. One end of the second grouting pipe 17 passes through the plugging bladder 21 near the orifice and extends into the sealing space 24, and a grouting port two 23 is opened on the second grouting pipe 17 inside the sealing space 24. The grouting pump set 15 includes a first grouting pump and a second grouting pump, and the slurry storage container set 14 includes a first slurry storage container and a second slurry storage container. The first slurry storage container is connected to the other end of the first grouting pipe 16 through the first grouting pump, and is used to deliver the slurry in the first slurry storage container to the two plugging bladders 21 after being pressurized by the first grouting pump to make them expand and seal. The second slurry storage container is connected to the other end of the second grouting pipe 17 through the second grouting pump, and is used to deliver the slurry in the second slurry storage container to the sealing space 24 after being pressurized by the second grouting pump for water sealing. The first slurry storage container contains cement slurry with an expansion agent, and the second slurry storage container contains flexible hole-sealing slurry. Check valves are installed on both the grouting port one 22 and the grouting port two 23 to prevent the slurry from flowing back into the first grouting pipe 16 or the second grouting pipe 17 during grouting.

[0033] The spraying device includes a storage tank 18 and a spray gun 19. The storage tank 18 contains flexible spraying material, and the storage tank 18 is connected to the spray gun 19 through a liquid delivery pipe 20, and is used to spray the flexible spraying material onto the roadway wall surface outside the drill hole through the spray gun 19.

[0034] The intelligent control system includes a PLC controller 25, a display device 26, a spraying warning device 27, a first pressure sensor 30, a second pressure sensor 31, a first control valve 28 and a second control valve 29. The first pressure sensor 30 and the second pressure sensor 31 are respectively installed on the first grouting pipe 16 and the second grouting pipe 17 for monitoring the pressure in the first grouting pipe 16 and the pressure in the second grouting pipe 17. The first control valve 28 and the second control valve 29 are respectively installed on the first grouting pipe 16 and the second grouting pipe 17 for controlling the on-off of the first grouting pipe 16 and the second grouting pipe 17. The PLC controller 25 is connected to the gas drainage borehole sealing quality detection device 8, the display device 26, the spraying warning device 27, the grouting pump set 15, the first pressure sensor 30, the second pressure sensor 31, the first control valve 28 and the second control valve 29, and is used for receiving the data fed back by the gas drainage borehole sealing quality detection device 8, the first pressure sensor 30 and the second pressure sensor 31, and controlling the states of the grouting pump set 15 and the spraying warning device 27 and the opening and closing of the first control valve 28 and the second control valve 29 according to the fed-back sealing quality situation. At the same time, the gas drainage borehole sealing quality situation, the pressure data, the states of the grouting pump set 15, the spraying warning device 27, the first control valve 28 and the second control valve 29 are transmitted to the display device 26 for display. The spraying warning device 27 is provided with a voice signal reminder for reminding the operator to start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole.

[0035] As an improvement of the present invention, the gas drainage pipe 4 is composed of a plurality of hollow pipes with a length of 1 m and a diameter of 20 mm coaxially connected by sealing threads, and the length of the gas drainage pipe 4 is adjusted according to the borehole depth. The hollow pipes are made of aluminum-plastic material. The gas drainage pipe 3 outside the borehole is connected to the main drainage pipeline through a tee 5. One end of the gas drainage pipe 4 is equipped with a filter net 7 to prevent coal chips from entering the gas drainage pipe 4 and blocking the pipeline. The other end of the gas drainage pipe 4 extends out of the tee 5 and is provided with a valve switch 6 for controlling the on-off of the gas drainage pipe 4.

[0036] As another improvement of the present invention, the sealing material is a non-setting flexible paste material, and the flexible spraying material is a surface sealing material, both of which can adopt existing materials. Among them, the sealing material can also be made of modified sodium-based bentonite and water, and after being made, it presents a liquid state with adjustable viscosity, good water retention and micro-expansion characteristics. Under the action of the grouting pressure, the material can enter the tiny cracks around the borehole to realize the sealing of the borehole. In addition, the surface sealing material can be made of cement, a softening agent, a coagulant, a flame retardant and water, and after being made, it presents a viscous liquid state. After being spray-formed, it has good flexibility and sealing performance and can effectively seal the air leakage channel.

[0037] The working method of the above-mentioned integrated drilling and plugging system with dynamic sealing - flexible spraying is as follows. The specific steps are as follows:

[0038] A. Layout of the integrated plugging system: Place the gas drainage pipe 3 into the gas drainage borehole, and place one end of the gas extraction pipe 4 into the gas drainage pipe 3, and connect the other end to the air inlet of the gas drainage borehole sealing quality detection device 8; Prepare cement slurry containing an expander, flexible plugging slurry, and flexible spraying material, and place them into the first slurry storage container, the second slurry storage container, and the material storage tank 18 respectively. Then, after connecting other components, the layout process of the integrated plugging system is completed;

[0039] B. Sealing the borehole with the plugging bag: The PLC controller 25 first opens the control valve 1 28 and starts the first grouting pump, and injects the cement slurry containing an expander into the two plugging bags 21 through the first grouting pipe 16 and the grouting port 1 22. During the grouting process, the two plugging bags 21 continuously expand and gradually support the entire borehole, forming a sealed space 24 between the two plugging bags 21. At the same time, the reading of the pressure sensor 1 30 on the first grouting pipe 16 continuously changes. When the reading of the pressure sensor 1 30 gradually stabilizes at 2 MPa, the PLC controller 25 closes the control valve 1 28 and the first grouting pump, and completes the sealing of the borehole with the plugging bag 21;

[0040] C. Preliminary sealing and spraying: After the cement slurry in the plugging bag 21 solidifies, the PLC controller 25 opens the control valve 2 29 and starts the second grouting pump, and injects the flexible hole - plugging slurry into the sealed space 24 between the two plugging bags through the second grouting pipe 17. The grouting pressure is not less than the set minimum grouting pressure, so that the flexible hole - plugging slurry can penetrate into the cracks of the borehole surrounding rock to achieve the sealing of the borehole. During this process, the reading of the pressure sensor 2 31 on the second grouting pipe 17 continuously changes and is continuously fed back to the PLC controller 25. When the reading of the pressure sensor 2 31 reaches 1.6 MPa, the PLC controller 25 sends a pulsating cyclic grouting instruction to the second grouting pump. The pulsating cycle is 2 min, with a pause of 0.5 min, and continuous injection until the reading of the pressure sensor 2 31 remains stable for 10 min. Then, the PLC controller 25 closes the control valve 2 29 and the second grouting pump, and completes the primary sealing of the gas drainage borehole; Subsequently, the PLC controller 25 starts the spraying warning device 27, and gives a voice reminder to manually start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole. The spraying thickness of the material is 5 mm, and the primary spraying work is completed after the entire borehole roadway wall is sprayed;

[0041] D. Dynamic sealing - flexible spraying: After the initial sealing and spraying are completed, connect the gas drainage pipe 3 to the main drainage pipeline and start gas drainage. During the drainage process, use the gas drainage borehole sealing quality detection device 8 to monitor the sealing quality of the borehole in real time. Specifically: Set the oxygen concentration threshold and gas concentration threshold in the sealing quality determination module. The gas detection module 10 detects the oxygen concentration, gas concentration, negative pressure, and flow rate of the gas extracted from the gas drainage pipe in real time. The negative pressure data and flow rate data are used to adjust the power of the micro - drainage pump 9 and can also be used as auxiliary data for judging the borehole quality (a large decrease in negative pressure can also indicate serious external air leakage). If the detected oxygen concentration exceeds the oxygen concentration threshold (indicating that external gas enters the borehole and there is air leakage), and at the same time the gas concentration threshold is lower than the gas concentration threshold (indicating that air leakage affects the gas drainage concentration), it indicates that the borehole quality has decreased. At this time, the PLC controller 25 starts the borehole sealing program, opens the control valve two 29 and starts the second grouting pump, and injects flexible sealing slurry into the closed space 24 through the second grouting pipe 17. The grouting pressure is not less than 1.8 MPa of the set minimum grouting pressure. During this process, the reading of the pressure sensor two 31 on the second grouting pipe 17 changes continuously and is continuously fed back to the PLC controller. When the reading of the pressure sensor two 31 reaches 1.6 MPa, the PLC controller 25 sends a pulsating cyclic grouting instruction to the second grouting pump. The pulsating cycle is 2 minutes, with a pause of 0.5 minutes, and continuous injection until the reading of the pressure sensor two 31 remains stable for 10 minutes. Then the PLC controller 25 closes the control valve two 29 and the second grouting pump to complete the secondary sealing of the gas drainage borehole. After that, use the gas drainage borehole sealing quality detection device 8 to detect the borehole sealing quality again. If the borehole sealing quality returns to normal, continue the gas drainage work; if the borehole sealing quality still decreases, the PLC controller 25 starts the spraying warning device 27 to voice - remind the operator to start the spraying device to spray the flexible spraying material onto the roadway wall outside the borehole. After spraying, continue the gas drainage work; continuously monitor the borehole sealing quality and cycle through the dynamic sealing process of first sealing - then spraying to ensure the efficiency of gas drainage.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A drilling integrated isolation system with dynamic sealing and flexible spraying, characterized in that: It includes gas extraction and sealing device, gas extraction drilling and sealing quality detection device, intelligent control system, grouting device and spraying device; The gas extraction and sealing device comprises a gas extraction pipe, a gas extraction pipe and two sealing bags. The gas extraction pipe is installed in the borehole and is used to extract gas inside the borehole. The two sealing bags are installed outside the gas extraction pipe and are used to seal between the borehole and the gas extraction pipe and form a sealed space between the two sealing bags. One end of the gas extraction pipe passes through the gas extraction pipe and extends into the borehole, and the other end is outside the borehole and is used to collect gas at the end of the gas extraction pipe inside the borehole. The gas extraction borehole sealing quality detection device comprises a shell, a micro extraction pump, a gas detection module, a sealing quality determination module and an air pipe, wherein an air inlet and an air outlet are respectively arranged on both sides of the shell, the air pipe is installed in the shell and its two ends are respectively connected to the air inlet and the air outlet, the gas extraction pipe is connected to the air pipe through the air inlet from the outside, and is used to transport the collected gas into the air pipe; the micro extraction pump is installed on the air pipe, and is used to provide extraction negative pressure inside the air pipe; the gas detection module is installed on the air pipe, and is used to detect the gas composition and concentration flowing through the air pipe; the sealing quality determination module is connected to the gas detection module, and is used to obtain the detection data of the gas detection module, and then analyze and process it to determine the sealing quality of the borehole; The grouting device comprises a first grouting pipe, a second grouting pipe, a grouting pump group and a grouting container group, one end of the first grouting pipe passes through a blocking bag near the orifice and extends into the other blocking bag, and the first grouting pipe inside the two blocking bags is provided with a first grouting port, one end of the second grouting pipe passes through a blocking bag near the orifice and extends into the sealed space, and the second grouting pipe in the sealed space is provided with a second grouting port; the grouting pump group comprises a first grouting pump and a second grouting pump, and the grouting container group comprises a first grouting container and The second slurry storage container, the first slurry storage container is connected to the other end of the first grouting pipe through the first grouting pump, and is used to transport the slurry in the first slurry storage container to the two sealing bags after being pressurized by the first grouting pump to make them expand and seal; the second slurry storage container is connected to the other end of the second grouting pipe through the second grouting pump, and is used to transport the slurry in the second slurry storage container to the sealed space for water sealing after being pressurized by the second grouting pump; the first slurry storage container contains cement slurry containing an expansion agent, and the second slurry storage container contains flexible sealing slurry; The spraying device includes a storage tank and a spray gun. The storage tank contains a flexible spray material. The storage tank is connected to the spray gun through a liquid infusion tube and is used to spray the flexible spray material to the tunnel wall outside the drill hole through the spray gun. The intelligent control system comprises a PLC controller, a display device, a spray warning device, a pressure sensor 1, a pressure sensor 2, a control valve 1 and a control valve 2. The pressure sensor 1 and the pressure sensor 2 are respectively mounted on the first grouting pipe and the second grouting pipe to monitor the pressure in the first grouting pipe and the pressure in the second grouting pipe; the control valve 1 and the control valve 2 are respectively mounted on the first grouting pipe and the second grouting pipe to control the on and off of the first grouting pipe and the second grouting pipe; the PLC controller and the gas extraction drilling hole sealing quality detection device, the display device, the spray warning device, the grouting pump group, the pressure sensor 1, the pressure sensor 2 , control valve one and control valve two are connected, and are used to receive data fed back by the gas extraction drilling hole sealing quality detection device, pressure sensor one and pressure sensor two, and control the status of the grouting pump group and the spraying early warning device and the opening and closing of the control valve one and the control valve two according to the feedback of the sealing quality, and at the same time transmit the gas extraction drilling hole sealing quality, pressure data, the grouting pump group, the spraying early warning device, the status of the control valve one and the control valve two to the display device for display; the spraying early warning device is provided with a voice signal reminder, which is used to remind the manual start of the spraying device to spray the flexible spray material onto the tunnel wall outside the borehole.

2. The integrated drilling isolation system with dynamic sealing and flexible spraying according to claim 1 is characterized in that: The gas extraction pipe is formed by coaxially connecting multiple hollow pipes with a length of 1m and a diameter of 20mm through sealing threads. The length of the gas extraction pipe is adjusted according to the drilling depth; the hollow pipe is made of aluminum-plastic material.

3. The integrated drilling isolation system with dynamic sealing and flexible spraying according to claim 1 is characterized in that: The gas extraction pipe outside the borehole is connected to the main extraction pipeline through a tee. A filter is installed at one end of the gas extraction pipe to prevent coal dust from entering the gas extraction pipe and clogging the pipeline. The other end of the gas extraction pipe extends from the tee and is provided with a valve switch to control the on and off of the gas extraction pipe.

4. The integrated drilling isolation system with dynamic sealing and flexible spraying according to claim 1 is characterized in that: The gas detection module includes an oxygen concentration sensor, a gas concentration sensor, a negative pressure sensor and a flow sensor, which are respectively used to detect the oxygen concentration, gas concentration, air pressure and flow of the gas in the trachea; the trachea is made of PVC flame-retardant tube.

5. The integrated drilling isolation system with dynamic sealing and flexible spraying according to claim 1, characterized in that: The sealing slurry is a non-solidifying flexible paste material, and the flexible spraying material is a surface sealing material.

6. The integrated drilling isolation system with dynamic sealing and flexible spraying according to claim 1, characterized in that: The first grouting port and the second grouting port are both equipped with a one-way valve to prevent the slurry from flowing back to the first grouting pipe or the second grouting pipe during grouting.

7. A working method of the integrated drilling isolation system with dynamic sealing-flexible spraying according to any one of claims 1 to 6, characterized in that: The specific steps are: A. Laying out the integrated sealing system: placing the gas extraction pipe into the gas extraction borehole, placing one end of the gas extraction pipe in the gas extraction pipe, and connecting the other end to the air inlet of the gas extraction borehole sealing quality detection device; preparing cement slurry containing an expansion agent, a flexible sealing slurry, and a flexible spraying material, and placing them in the first slurry storage container, the second slurry storage container, and the storage tank, respectively, and then connecting the other components to complete the laying out of the integrated sealing system; B. Sealing the hole with the plugging bag: The PLC controller first opens the control valve 1 and starts the first grouting pump, and injects cement slurry containing an expansion agent into the two plugging bags through the first grouting pipe and the grouting port 1. During the grouting process, the two plugging bags continue to expand and gradually support the entire borehole, forming a closed space between the two plugging bags. At the same time, the indication of the pressure sensor 1 on the first grouting pipe continues to change. When the indication of the pressure sensor 1 gradually stabilizes to 2MPa, the PLC controller closes the control valve 1 and the first grouting pump to complete the sealing of the plugging bag hole; C. Preliminary sealing and spraying: After the cement slurry in the plugging bag solidifies, the PLC controller opens the control valve 2 and starts the second grouting pump. The flexible sealing slurry is injected into the closed space between the two plugging bags through the second grouting pipe. The grouting pressure is not less than the set minimum grouting pressure, so that the flexible sealing slurry can penetrate into the cracks of the surrounding rock of the borehole to achieve the sealing of the borehole. During this process, the indication of the pressure sensor 2 on the second grouting pipe keeps changing and is continuously fed back to the PLC controller. When the pressure When the reading of sensor 2 reaches 1.6MPa, the PLC controller sends a pulsating cycle grouting instruction to the second grouting pump, and continues to inject until the reading of pressure sensor 2 remains stable for 10 minutes. The PLC controller then closes control valve 2 and the second grouting pump to complete the initial sealing of the gas extraction borehole; then the PLC controller starts the spraying early warning device, and the voice prompts the manual start of the spraying device to spray the flexible spray material onto the tunnel wall outside the borehole. After the entire borehole tunnel wall is sprayed, the initial spraying work is completed; D. Dynamic sealing - flexible spraying: After completing the initial sealing and spraying, connect the gas extraction pipe to the main extraction pipeline and start gas extraction. During the extraction process, the sealing quality of the borehole is monitored in real time through the gas extraction borehole sealing quality detection device. When the sealing quality decreases, the PLC controller starts the borehole sealing program, opens the control valve 2 and starts the second grouting pump, and injects flexible sealing slurry into the confined space through the second grouting pipe. The grouting pressure is not less than the set minimum grouting pressure. During this process, the indication of the second pressure sensor on the second grouting pipe keeps changing and is continuously fed back to the PLC controller. When the indication of the second pressure sensor reaches 1.6MPa, the PLC controller sends a signal to the second grouting pump. The pulsating cycle grouting instruction continues to inject until the second indication of the pressure sensor remains stable for 10 minutes. The PLC controller then closes the control valve 2 and the second grouting pump to complete the secondary sealing of the gas extraction borehole. After that, the gas extraction borehole sealing quality detection device is used to detect the borehole sealing quality again. If the borehole sealing quality returns to normal, the gas extraction work will continue. If the borehole sealing quality is still reduced, the PLC controller starts the spraying early warning device, and the voice prompts the manual start of the spraying device to spray the flexible spray material onto the tunnel wall outside the borehole. After the spraying is completed, the gas extraction work will continue. The borehole sealing quality is continuously monitored, and the dynamic sealing process of sealing first and then spraying is repeated in a cycle to ensure the efficiency of gas extraction.

8. The working method according to claim 7, characterized in that: The gas extraction borehole sealing quality detection device monitors the sealing quality of the borehole in real time as follows: The oxygen concentration threshold and gas concentration threshold are set in the sealing quality judgment module. The gas detection module detects the oxygen concentration and gas concentration of the gas extracted from the gas extraction pipe in real time. If the detected oxygen concentration exceeds the oxygen concentration threshold and the gas concentration is lower than the gas concentration threshold, it means that the drilling quality is reduced. At this time, the PLC controller starts the drilling sealing program.

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