Drilling integrated packing system and method with dynamic sealing and flexible spraying functions

Abstract

According to the drilling integrated packing system and method with the dynamic sealing and flexible spraying functions, firstly, two blocking bags are subjected to grouting expansion through a grouting device, a sealed space is formed between the two blocking bags, and flexible hole sealing grout is injected into the sealed space to enable the flexible hole sealing grout to enter drilling cracks; a spraying device is used for spraying a flexible spraying material on the roadway surface outside the drilled hole, and primary sealing and spraying work is achieved; after completion, gas extraction is carried out on the drill hole, in the gas extraction process, the gas extraction drill hole sealing quality detection device collects gas in the drill hole in real time for data detection, analysis and processing are carried out in combination with a set threshold value, and therefore the drill hole sealing quality is judged, and if the hole sealing quality is reduced, the grouting device and the spraying device work, and the grouting device and the spraying device work. Re-sealing and spraying of the drilled hole are achieved; and in the subsequent gas extraction process, according to the drilling quality judged in real time, the dynamic hole sealing process of first sealing and then spraying can be continuously conducted, and therefore the gas extraction efficiency is guaranteed.

Description

Technical Field

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

[0002] Gas extraction operations play a key role in the safe production of high-gas outburst mines. By drilling holes into coal seams to extract gas, the gas content in coal seams can be reduced, thereby reducing the possibility of coal and gas outbursts or gas explosions. However, under the influence of mining stress disturbance, traditional solid sealing materials and coal bodies will break in gas extraction boreholes, forming air leakage channels, resulting in low gas extraction efficiency, and in severe cases, it may also cause gas extraction borehole failure. At present, the technology for sealing gas extraction boreholes is mainly focused on 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 extraction effect. In addition, most of the current sealing technologies are "passive" sealing, that is, the sealing material is sealed by pressure resistance after solidification. This method is difficult to adapt to borehole deformation and changes in mining disturbance stress distribution, and it is impossible to adjust the sealing situation in time.

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

[0004] In response to the problems existing in the above-mentioned prior art, the present invention provides an integrated borehole sealing system and method with dynamic sealing-flexible spraying, which can provide both dynamic adaptability and high-efficiency flexible spraying sealing performance during the borehole sealing process, thereby adapting to the changes in borehole deformation and mining disturbance stress distribution, ensuring that the sealing quality is continuously maintained at a good level under complex geostress environments, and ultimately achieving efficient extraction of borehole gas.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a drilling integrated isolation system with dynamic sealing-flexible spraying, including a gas extraction and sealing device, a gas extraction drilling 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 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.

[0011] Furthermore, the gas extraction pipe is formed by coaxially connecting multiple hollow pipes with a length of 1 m and a diameter of 20 mm through sealing threads, and the length of the gas extraction pipe is adjusted according to the drilling depth; the hollow pipe is made of aluminum-plastic material.

[0012] Furthermore, 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.

[0013] Furthermore, 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.

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

[0015] Furthermore, the grouting port 1 and the grouting port 2 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.

[0016] The working method of the above-mentioned integrated drilling isolation system with dynamic sealing-flexible spraying comprises the following specific steps:

[0017] 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 plugging 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;

[0018] 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;

[0019] 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;

[0020] 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.

[0021] Furthermore, the gas extraction borehole sealing quality detection device monitors the sealing quality of the borehole in real time as follows:

[0022] 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 threshold 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.

[0023] Compared with the prior art, the present invention adopts a combination of a gas extraction and sealing device, a gas extraction borehole sealing quality detection device, an intelligent control system, a grouting device and a spraying device. First, the borehole is sealed by grouting and expanding the two sealing bags through the grouting device, and a sealed space is formed between the two sealing bags. A flexible sealing slurry is injected into the sealed space so that the slurry enters the borehole cracks to achieve the initial sealing; then, the spraying device is used to spray the flexible spraying material on the roadway surface outside the borehole to achieve the initial spraying work; after completion, the borehole is gas extracted through the gas extraction pipe, and the gas is During the extraction process, the gas extraction borehole sealing quality detection device collects the gas in the borehole in real time through the gas extraction and sealing device. The gas passes through the gas extraction borehole sealing quality detection device for oxygen concentration and gas concentration detection, and is analyzed and processed with the set threshold value, so as to judge the quality of borehole sealing. If the sealing quality is reduced, the grouting device and the spraying device are controlled to work in sequence to achieve re-sealing and spraying of the borehole; and in the subsequent gas extraction process, according to the real-time judgment of the borehole quality, the dynamic sealing process of sealing first and then spraying can be continuously carried out, so as to ensure the efficiency of gas extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

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

[0026] Figure 3 It is a schematic diagram of the structure of the gas extraction drilling hole sealing quality detection system in the present invention.

[0027] In the figure: 1-coal seam, 2-coal seam floor, 3-gas extraction pipe, 4-gas extraction pipe, 5-tee, 6-valve switch, 7-filter, 8-gas extraction drilling and 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 judgment module, 12-trachea, 13-quick-connect plug , 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 tube, 21-sealing bag, 22-grouting port one, 23-grouting port two, 24-confined 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

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

[0029] like Figure 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 group 15 and a grouting container group 14, one end of the first grouting pipe 16 passes through a blocking bag 21 near the orifice and extends into another blocking bag 21, and the first grouting pipe 16 inside the two blocking bags 21 is provided with a grouting port 1 22, one end of the second grouting pipe 17 passes through the blocking bag 21 near the orifice and extends into a sealed space 24, and a grouting port 23 is provided on the second grouting pipe 17 in the sealed space 24; the grouting pump group 15 includes a first grouting pump and a second grouting pump, the grouting container group 14 includes a first grouting container and a second grouting container, the first grouting container 16 The container is connected to the other end of the first grouting pipe 16 through a first grouting pump, and is used to transport the slurry in the first slurry storage container to the two sealing bags 21 after being pressurized by the first grouting pump to make it expand and seal; the second slurry storage container is connected to the other end of the second grouting pipe 17 through a second grouting pump, and is used to transport the slurry in the second slurry storage container to the sealed space 24 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 grouting port 1 22 and the grouting port 2 23 are both equipped with a one-way valve to prevent the slurry from flowing back to 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 a flexible spray material. The storage tank 18 is connected to the spray gun 19 through a liquid infusion tube 20, and is used to spray the flexible spray material to the tunnel wall outside the drill hole through the spray gun 19;

[0034] The intelligent control system includes a PLC controller 25, a display device 26, a spray warning device 27, a pressure sensor 1 30, a pressure sensor 2 31, a control valve 1 28 and a control valve 2 29. The pressure sensor 1 30 and the pressure sensor 2 31 are respectively installed on the first grouting pipe 16 and the second grouting pipe 17 to monitor the pressure in the first grouting pipe 16 and the pressure in the second grouting pipe 17; the control valve 1 28 and the control valve 2 29 are respectively installed on the first grouting pipe 16 and the second grouting pipe 17 to control the on and off of the first grouting pipe 16 and the second grouting pipe 17; the PLC controller 25 and the gas extraction drilling hole sealing quality detection device 8, the display device 26, the spray warning device 27, the grouting pump group 15, the pressure sensor 1 30, pressure sensor 2 31, control valve 1 28 and control valve 2 29 are connected to receive data fed back by the gas extraction drilling hole sealing quality detection device 8, pressure sensor 1 30 and pressure sensor 2 31, and control the status of the grouting pump group 15 and the spraying warning device 27 and the opening and closing of the control valve 1 28 and the control valve 2 29 according to the feedback of the sealing quality. At the same time, the gas extraction drilling hole sealing quality, pressure data, the status of the grouting pump group 15, the spraying warning device 27, the control valve 1 28 and the control valve 2 29 are transmitted to the display device 26 for display; the spraying warning device 27 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.

[0035] As an improvement of the present invention, the gas extraction pipe 4 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 4 is adjusted according to the depth of the borehole; the hollow pipe is made of aluminum plastic. The gas extraction pipe 3 outside the borehole is connected to the main extraction pipeline through a tee 5. A filter screen 7 is installed at one end of the gas extraction pipe 4 to prevent coal dust from entering the gas extraction pipe 4 and blocking the pipeline. The other end of the gas extraction pipe 4 extends from the tee 5 and is provided with a valve switch 6 to control the on and off of the gas extraction pipe 4.

[0036] As another improvement of the present invention, the sealing material is a non-solidifying flexible paste material and the flexible spray material is a surface sealing material, both of which can adopt existing materials; wherein the sealing material can also be made by mixing modified nano-bentonite and water, and after being made, it is in a liquid state, with adjustable viscosity, good water retention and micro-expansion characteristics, and under the action of grouting pressure, the material can enter the tiny cracks around the borehole to achieve the sealing of the borehole; in addition, the surface sealing material can be made by mixing cement, a softener, a coagulant, a flame retardant and water, and after being made, it is in a viscous liquid, and after spraying and molding, it has good flexibility and sealing, and can effectively seal the air leakage channel.

[0037] The working method of the above-mentioned integrated drilling isolation system with dynamic sealing-flexible spraying comprises the following specific steps:

[0038] A. Laying out the integrated sealing system: placing the gas extraction pipe 3 into the gas extraction borehole, placing one end of the gas extraction pipe 4 into the gas extraction pipe 3, and connecting the other end to the air inlet of the gas extraction borehole sealing quality detection device 8; preparing cement slurry containing an expansion agent, a flexible plugging slurry, and a flexible spraying material, and placing them into the first slurry storage container, the second slurry storage container, and the storage tank 18, respectively, and then connecting the other components to complete the laying out of the integrated sealing system;

[0039] B. Sealing the hole with the plugging bag: The PLC controller 25 first opens the control valve 28 and starts the first grouting pump, and injects cement slurry containing an expansion agent into the two plugging bags 21 through the first grouting pipe 16 and the grouting port 22. During the grouting process, the two plugging bags 21 continue to expand and gradually support the entire borehole, forming a closed space 24 between the two plugging bags 21. At the same time, the indication of the pressure sensor 30 on the first grouting pipe 16 continues to change. When the indication of the pressure sensor 30 gradually stabilizes to 2MPa, the PLC controller 25 closes the control valve 28 and the first grouting pump, completing the sealing of 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 29 and starts the second grouting pump to inject flexible sealing slurry into the closed 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 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 31 on the second grouting pipe 17 keeps changing 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 cycle grouting instruction to the second grouting pump, the pulsating cycle is 2min, pause for 0.5min, and continue to inject until the indication of the pressure sensor 2 31 remains stable for 10min, and the PLC controller 25 closes the control valve 29 and the second grouting pump to complete the initial sealing of the gas extraction borehole; then the PLC controller 25 starts the spraying early warning device 27, and the voice reminds the manual start of the spraying device to spray the flexible spray material onto the tunnel wall outside the borehole. The material spraying thickness is 5mm. After the entire borehole tunnel wall is sprayed, the initial spraying work is completed;

[0041] D. Dynamic sealing - flexible spraying: After the initial sealing and spraying, the gas extraction pipe 3 is connected to the main extraction pipeline to start gas extraction. During the extraction process, the gas extraction borehole sealing quality detection device 8 is used to monitor the sealing quality of the borehole in real time. Specifically, the oxygen concentration threshold and the gas concentration threshold are set in the sealing quality judgment module. The gas detection module 10 detects the oxygen concentration, gas concentration, negative pressure and flow of the gas extracted from the gas extraction pipe in real time. The negative pressure data and flow data are used to adjust the power of the micro extraction pump 9. At the same time, it can be used as It is auxiliary data for judging the quality of drilling (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 the gas concentration threshold is lower than the gas concentration threshold (indicating that air leakage affects the gas extraction concentration), it means that the drilling quality is reduced. At this time, the PLC controller 25 starts the drilling sealing program, opens the control valve 29 and starts the second grouting pump, and injects flexible sealing slurry into the enclosed space 24 through the second grouting pipe 17. The grouting pressure is not less than the set The minimum grouting pressure is 1.8MPa. During this process, the indication of the pressure sensor 2 31 on the second grouting pipe 17 keeps changing and is continuously fed back to the PLC controller. When the indication of the pressure sensor 2 31 reaches 1.6MPa, the PLC controller 25 sends a pulsating cycle grouting instruction to the second grouting pump. The pulsating cycle is 2min, and the pause is 0.5min. The injection is continued until the indication of the pressure sensor 2 31 remains stable for 10min. The PLC controller 25 closes the control valve 29 and the second grouting pump to complete the gas extraction. The borehole is sealed for the second time, and then the borehole sealing quality is tested again by the gas extraction borehole sealing quality detection device 8. If the borehole sealing quality returns to normal, the gas extraction work continues; if the borehole sealing quality is still reduced, the PLC controller 25 starts the spraying warning device 27, and voice reminds 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 continues; and the borehole sealing quality is continuously monitored, and the dynamic sealing process of sealing first and then spraying is repeated in a cycle, so as to ensure the efficiency of gas extraction.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection 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, 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 material 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 plugging 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 threshold 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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