A self-feedback recoverable coal seam seepage wetting system and use method thereof

Abstract

The present invention discloses a self-feedback recoverable coal seam seepage wetting system and a use method thereof, wherein the seepage wetting system comprises a monitoring system and a recoverable and enhanced coal seam seepage wetting system, detection holes are arranged on both sides of the seepage borehole, a cylindrical pipe with a tire-type plug is placed in the borehole, an acid-resistant high-pressure pipe is sent into a predetermined position in the cylindrical pipe together with a recoverable water injection device, a control display controls the recoverable water injection device, and a spring and an inner and outer hook body bite structure are used to complete the sealing of the cylindrical pipe by an expansion airbag, and under the control of the control display, a continuous water injection tank and an acid-resistant water injection pump are controlled to complete water injection, and the permeability and wetting properties of the water-injected coal seam are monitored in real time, and after the water injection operation is completed, the recoverable water injection device and the acid-resistant high-pressure pipe are recovered together, so as to realize continuous water injection, real-time monitoring and partial recovery of the water injection system, which can effectively improve the underground water injection efficiency and effect and reduce the coal seam water injection cost.

Description

Technical Field

[0001] The present invention relates to a seepage wetting system and a method for using a recoverable coal seam with self-feedback, belonging to the field of permeability enhancement and gas extraction in coal seams in underground coal mines, and is particularly suitable for operations in gas coal seams with high adsorption and difficulty in desorption. Background Art

[0002] With the exhaustion of shallow coal resources, underground mining will gradually extend to deep coalfields. The ground stress, gas pressure and content of coal seams have increased significantly, resulting in more severe disaster prevention and control situations such as coal and gas outbursts, dust, and rock burst. Coal seam water injection has been widely used in coal mine production as an important industrial measure for dust prevention, prevention of coal and gas outbursts, softening coal bodies, and improving the venting of top coal. However, in the specific coal seam water injection process, due to the lack of monitoring and feedback at each stage of the drilling water injection process, many process parameters of coal seam water injection need to be manually adjusted based on practical experience, which greatly affects the water injection effect; in addition, the drilling seals before coal seam water injection are mostly disposable devices, which increases the cost of water injection operations; and the water injection devices used in coal seam water injection operations are mostly intermittent water injection, which greatly reduces the water injection efficiency. Therefore, the present invention proposes a self-feedback seepage wetting system and a method of use for recoverable coal seams. According to the problems arising in the current coal seam water injection operations, the existing water injection systems and methods are further improved to improve the efficiency of coal seam water injection operations and achieve transparency in water injection operations. Summary of the invention

[0003] In order to solve the problem of the recoverability of coal seam water injection equipment, realize the continuity of water injection operation and monitor the permeability and wettability of the injected coal seam in real time, the present invention provides a recoverable coal seam seepage wetting system with self-feedback and a method of use, thereby improving the efficiency of coal seam water injection operation and realizing the transparency of water injection operation.

[0004] A self-feedback seepage wetting system for recoverable coal seams, the seepage wetting system comprising a monitoring system and a seepage wetting system for recoverable and enhanced coal seams, the monitoring system comprising a stress sensor, a moisture sensor and a display controller, three detection holes are respectively arranged on both sides of the borehole, a lead is placed in each detection hole, two groups of ground stress sensors and moisture sensors are arranged on each lead, and are respectively placed at the front and middle positions of the borehole, and the lead ends located outside the borehole are connected to the display controller; the seepage wetting system for recoverable and enhanced coal seams comprises a cylindrical pipe arranged in the borehole and provided with a tire-type plug 1 and a tire-type plug 2, a small pipe groove is arranged at the upper end of the tire-type plug 1, one end of the grouting pipe passes through the small pipe groove and penetrates into the grouting area, and a valve is arranged at the other end. The cylindrical pipe is equipped with a recyclable water injection device, which is connected to an acid-resistant high-pressure pipe. A plurality of circular water outlet holes are arranged on the pipe wall at the end of the acid-resistant high-pressure pipe, and the other end is connected to a continuous water injection tank through an acid-resistant leather hose. An acid-resistant water injection pump is arranged in the middle of the acid-resistant high-pressure pipe. The recyclable water injection device comprises a left-wing sliding tube, a sliding tube body one, a middle connecting tube, a sliding tube body two and a right-wing sliding tube which are slidably sleeved in sequence. The recyclable water injection device is also provided with a spring one, a spring two, an airbag one and an airbag two. The two ends of the spring one are respectively connected to the tube bodies of the left-wing sliding tube and the middle connecting tube, and the two ends of the spring two are respectively connected to the tube bodies of the middle connecting tube and the right-wing sliding tube. One set of airbags is arranged on the sliding tube body one, and the second set of airbags is arranged on the sliding tube body two.

[0005] Furthermore, three detection holes are set on both sides of the borehole as follows: detection hole one and detection hole two are set 10m on both sides of the borehole, detection hole three and detection hole five are set 5m and 10m away from the outside of detection hole one, and detection hole four and detection hole six are set 5m and 10m away from the outside of detection hole two.

[0006] Furthermore, the tire-type plug 1 and the tire-type plug 2 are axially symmetrical objects, one side of which is composed of a circular ring body, a small-diameter arc surface, a large tube groove and a large-diameter arc surface. The large tube groove transversely penetrates the circular ring body, the large-diameter arc surface is circumscribed to the circular ring body and inscribed to the small-diameter arc surface, and the inner end of the small-diameter arc surface is connected to the large tube groove. The difference from the tire-type plug 2 is that a small tube groove is provided on the upper part of the tire-type plug 1.

[0007] Furthermore, the continuous water injection tank includes an acid-resistant water tank, a support frame, an acid liquid container, a water pipe, a stirring device and a water level monitor, wherein the acid-resistant water tank is placed on the support frame, the stirring device is connected directly above the acid-resistant water tank, a water pipe is inserted into the interior on the right side, an opening is provided on the left side, facing the acid liquid container connected to the support frame, and acid-resistant flow control valves are provided on the acid liquid container and the water pipe respectively.

[0008] Furthermore, the left wing sliding tube and the right wing sliding tube have the same structure, and are both composed of a short round tube, an inner hook claw body, a long round tube, and a connecting round tube. The connecting round tube connects the short round tube and the long round tube. The inner hook claw body is connected to the long round tube. The middle connecting tube is composed of a second card body, a third card body, a vertebral bottom tube body, a vertebral bottom tube body, an outer hook claw body, an inner hook claw body, a slender round tube, a slender round tube, and a thick round tube. The two ends of the thick round tube are respectively connected to the vertebral bottom tube body, the vertebral bottom tube body, the slender round tube, and the slender round tube. The outer hook claw body 1 and the outer hook claw body 2 are respectively connected to the outer ports of the slender round tube 1 and the slender round tube 2, the card body 2 and the card body 3 are respectively located on the upper surface of the slender round tube 1 and the slender round tube 2 and the outer ports of the vertebral bottom tube body 1 and the vertebral bottom tube body 2, the sliding tube body 1 and the sliding tube body 2 are composed of a conventional round tube 1, a T-mouth round tube, a ball, an L-shaped round tube and a conventional round tube 2, the conventional round tube 1 and the short round tube on the right wing sliding tube and the left wing sliding tube are sleeved, the conventional round tube 2 and the middle connecting tube The first and second conical bottom tube bodies are sleeved with each other, two L-shaped tubes with different diameters and placed opposite to each other are connected to the first conventional tube, and the second conventional tube is connected to the second conventional tube. The second T-shaped tube is located between the two relatively L-shaped tubes, and a plurality of balls are scattered therein, so that the second T-shaped tube and the L-shaped tube can move relative to and toward each other more smoothly, and the two tubes can be prevented from separating. The two ends of the inflatable airbags are respectively connected to the first and second conventional tubes of the sliding tube bodies. The two tubes are fixed together and can change between the two states of the oblate body and the bulging spherical body when the sliding tube body one and the sliding tube body two move toward or away from each other, thereby realizing the blocking of the cylindrical pipeline and the recovery of the recyclable water injection device. One end of the spring one and the spring two are fixed on the vertebral bottom tube body of the left wing sliding tube one and the right wing sliding tube, and the other ends are respectively fixed on the vertebral bottom tube body one and the cone bottom tube body two of the middle connecting tube, and are fixed by the clamp body one, the clamp body two, the clamp body three and the clamp body four.

[0009] A method for using a self-feedback recoverable coal seam seepage system, firstly drilling a borehole in a coal wall, characterized by comprising the following steps:

[0010] a. Drill several circular slits with a distance of 10m and a diameter of 5m in the deep part of the borehole;

[0011] b. Drill horizontal detection holes 1 and 2 with a diameter of 30 cm at a horizontal position of 10 m on both sides of the borehole, and drill detection holes 3, 4, 5 and 6 at horizontal positions of 5 m and 10 m outside detection holes 1 and 2 respectively;

[0012] c. Connect the ground stress sensor and moisture sensor at the front and middle of the lead wire respectively, and send them to the corresponding positions in the 6 detection holes in turn, and connect the other end to the display controller;

[0013] d. Insert the cylindrical pipe with tire plug 1 and tire plug 2 into the borehole;

[0014] e. Send the grouting pipe into the borehole so that the inner end of the grouting pipe passes through the small pipe groove of the tire plug and penetrates into the plugging area;

[0015] f. Pass the acid-resistant high-pressure pipe through the recyclable water injection device and send it into the interior of the cylindrical pipe together, so that the airbag 1 and airbag 2 of the recyclable water injection device are aligned with the expansion ring tube 1 and the expansion ring tube 2 respectively, and the front end of the acid-resistant high-pressure pipe is 10 to 20 meters away from the circular pancake slit;

[0016] g. Connect the acid-resistant leather hose, acid-resistant high-pressure pipeline, acid-resistant water pump and continuous water injection tank in sequence;

[0017] h. Use leads to connect the display controller to the recyclable water injection device, the stirring device, the water level monitor, and the acid-resistant flow control valve;

[0018] i. Turn the valve to press the plugging slurry from the grouting pipe into the plugging area;

[0019] j. After the plugging slurry is completely solidified, start the control display to control the left and right sliding tubes of the recyclable water injection device to move toward the middle connecting tube at the same time. Springs 1 and 2 are squeezed and contracted toward the middle. At the same time, conventional round tube 1 slides toward conventional round tube 2, and airbags 1 and 2 gradually transform from oblate bodies to bulging spheres. When the inner hook claws on the left and right sliding tubes pass over the outer hook claws 1 and 2 on both sides of the middle connecting tube, the conventional round tube 1 is rotated 45 degrees counterclockwise to align with the conventional round tube 2, so that the inner and outer hook claws are engaged with each other, so as to achieve the stability of airbags 1 and 2 and the complete filling of the bulging ring tube 1 and bulging ring 2, and complete the sealing of the cylindrical pipe;

[0020] k. Adjust the control display, open the acid-resistant flow control valve and the common flow control valve, inject a certain amount of acid and water into the acid-resistant water tank through the acid container and the water pipe, and then start the stirring device to stir the mixed liquid for 15 seconds;

[0021] l. The control display controls the opening of the acid-resistant valve for 10 seconds to complete the delivery of the acid from the acid-resistant water tank. Subsequently, the control display controls the opening of the acid-resistant valve and the start-up of the acid-resistant water injection pump. The acid is injected into the borehole and the circular pancake-shaped cut through the acid-resistant leather hose and the acid-resistant high-pressure pipeline;

[0022] m. When the acid in the acid-resistant water tank drops to the set acidity, the water level monitor transmits the water level signal to the control display, and then the control display controls the acid flow control valve and the common flow control valve to repeat the partial process in k~l, repeatedly completing the preparation and transfer of the acid in the acid-resistant water tank, and finally completing the continuous water filling operation of the continuous water filling tank;

[0023] n. At the same time, the ground stress sensors and moisture sensors of detection holes 1, 2, 3, 4, 5 and 6 transmit the infiltration and permeability information of the coal seam back through the leads;

[0024] o. When the penetration and wetting of the coal seam reach the ideal effect, the control display shuts down the sensors and valve switches, and stops the preparation of acid and water injection operations;

[0025] p. Adjust the control display, move the left and right wing sliding tubes of the recoverable water injection device inward and rotate them 45 degrees clockwise. Springs 1 and 2 are ejected outward by the elastic force, driving conventional circular tube 1 to slide back toward conventional circular tube 2. Airbags 1 and 2 are also restored from spherical bodies to oblate bodies, making it easy to recover the recoverable water injection device and the acid-resistant high-pressure pipeline together. In this way, the seepage wetting function of the system is realized and the recovery of part of the device is completed.

[0026] Beneficial effects: By adopting the above scheme, in the field of coal seam water injection, firstly, a recyclable water injection device is designed. Under the control of the control display, the elastic principle of the spring and the mutual engagement structure of the inner and outer hook bodies are used to drive the sliding tube body and the inflated air bag, so as to realize the mutual transformation of the inflated air bag between the oblong body and the spherical body, thereby realizing the sealing of the cylindrical pipe and the recovery of the device, reducing the loss of the device, and thus improving the production efficiency; secondly, a continuous water injection tank is designed to realize the automatic continuous preparation of acid and long-term continuous water injection; in addition, detection holes, ground stress sensors and moisture sensors are set up to monitor the permeability and wetting properties of the injected coal seam in real time, thereby realizing the transparency of the coal seam water injection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 It is a cross-sectional schematic diagram of the seepage wetting system of the recoverable enhanced coal seam of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a continuous water injection tank of the present invention;

[0030] Figure 4 is a schematic diagram of a cylindrical pipeline of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the "tire" type plug of the present invention;

[0032] Figure 6 It is a structural schematic diagram of a sealed space formed by two bulging pipes and a tire-type plug on a cylindrical pipe of the present invention;

[0033] Figure 7It is a schematic diagram of the recyclable water injection device of the present invention;

[0034] Figure 8 It is a partial structural cross-sectional schematic diagram of the recoverable water injection device of the present invention;

[0035] Fig. 9 is a schematic diagram of an acid-resistant high-pressure pipeline of the present invention;

[0036] Fig.10 It is a schematic structural diagram of the left and right wing sliding tubes of the present invention;

[0037] Fig.11 It is a structural schematic diagram of the middle connecting pipe of the present invention;

[0038] Fig.12 It is a schematic diagram of the arrangement structure of the spring 1 and the spring 2 of the present invention;

[0039] Fig.13 It is a schematic diagram of the structural principle of the recyclable water injection device of the present invention driving the expansion airbag to convert between the two states of the oblate body and the bulging spherical body;

[0040] Fig.14 It is a schematic structural diagram of two states of the sliding tube body of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments.

[0042] As shown in the figure, the present invention is a seepage wetting system for recoverable and enhanced coal seams with self-feedback, including a monitoring system I and a seepage wetting system II for recoverable and enhanced coal seams; the monitoring system I includes a detection hole 1 4-1 and a detection hole 2 4-2 distributed at 10m on both sides of a conventional borehole 2, a detection hole 3 4-3 and a detection hole 5 4-5 are respectively located at 5m and 10m away from the outside of the detection hole 1 4-1, a detection hole 4-4 and a detection hole 6 4-6 are respectively located at 5m and 10m away from the outside of the detection hole 2 4-2, a lead wire 5 is placed in each detection hole, and the front and middle ends of each lead wire 5 are respectively connected to a ground stress sensor 6 and a moisture sensor 7 to monitor the permeability and wetting properties of the coal seam after water injection, and the other ends of the 6 leads are connected to the display control 8 is connected; the seepage wetting system II for recoverable enhanced coal seam includes a cylindrical pipe 12 with a "tire" type plug 1 9-1 and a "tire" type plug 2 9-2, a small pipe groove 39 is provided on the upper end of the "tire" type plug 1 9-1, one end of the grouting pipe 10 passes through the small pipe groove 39 and goes deep into the grouting area, and a valve 11 is provided at the other end. The cylindrical pipe 12 has a built-in recoverable water injection device 13, and the recoverable water injection device 13 is connected to an acid-resistant high-pressure pipe 14. A plurality of circular water outlet holes are provided on the pipe wall at the end of the acid-resistant high-pressure pipe 14 to facilitate water injection operations, and the other end is connected to an acid-resistant leather pipe 15-1, and both ends of an acid-resistant water injection pump 16 are respectively connected to an acid-resistant leather pipe 15-1 and an acid-resistant leather pipe 2 15-2, and the other end of the acid-resistant leather pipe 2 15-2 is connected to a continuous water injection tank 17. The inner end of the conventional borehole 2 is provided with a plurality of "pancake" shaped slits 3, the diameter of the "pancake" shaped slits 3 is 5m, and the distance between adjacent "pancake" shaped slits 3 is 10m. The "tire" type plug 1 9-1 and the "tire" type plug 2 9-2 are axisymmetric objects, one side of which is composed of a torus 35, a small diameter arc surface 36, a large pipe groove 37 and a large diameter arc surface 38, the large pipe groove 37 horizontally penetrates the torus 35, the large diameter arc surface 38 is circumscribed to the torus 35 and inscribed to the small diameter arc surface 36, and the inner end of the small diameter arc surface 36 is connected to the large pipe groove 37. The difference from the "tire" type plug 2 9-2 is that the upper part of the "tire" type plug 1 9-1 is provided with a small pipe groove 39. The continuous water injection tank 17 is composed of an acid-resistant water tank 1 28-1, an acid-resistant water tank 2 28-2, a support frame 29, an acid container 30, a water pipe 31, a stirring device 32, a water level monitor 33, an acid-resistant flow control valve 34-1, a common flow control valve 34-2, an acid-resistant valve 1 34-3 and an acid-resistant valve 34-4, wherein the acid-resistant water tank 1 28-1 and the acid-resistant water tank 2 28-2 are respectively arranged on the upper and lower sides of the support frame 29, an acid-resistant valve 1 34-3 is arranged on the connecting pipe between the acid-resistant water tank 1 28-1 and the acid-resistant water tank 2 28-2, an acid-resistant valve 2 34-4 is arranged at the lower part of the acid-resistant water tank 28-2, a stirring device 32 is connected directly above the acid-resistant water tank 1 28-1, a water pipe 31 is inserted into the inside on the right side, and an opening is arranged on the left side, facing the acid container 30 connected to the support frame 29,The acid container 30 and the water pipe 31 are provided with an acid-resistant flow control valve 34-1 and a common flow control valve 34-2, respectively. The recyclable water injection device 13 is composed of a left wing sliding tube 13-1, a middle connecting tube 13-2, a right wing sliding tube 13-3, a spring 1 21-1, a spring 21-2, a sliding tube body 1 19-1, a sliding tube body 2 19-2, an inflatable airbag 1 18-1 and an inflatable airbag 2 18-2. The left wing sliding tube 13-1 and the right wing sliding tube 12-3 are located on both sides of the middle connecting tube 13-2, and are composed of a short round tube 23-1, an inner hook claw body 23-2, a long round tube 23-3, and a connecting round tube 23-4. The connecting round tube 23-4 connects the short round tube 23-1 and the long round tube 23-3. The inner hook claw body 23-2 is connected to the long round tube 23-3. The middle connecting tube 13-2 is composed of The card body 22-2, the card body 3 22-3, the vertebral base tube body 1 24-1, the vertebral base tube body 24-2, the outer hook claw body 1 25-1, the inner hook claw body 25-2, the slender round tube 1 26-1, the slender round tube 2 26-2 and the thick round tube 27 are composed, and the two ends of the thick round tube 27 are respectively connected to the vertebral base tube body 1 24-1, the vertebral base tube body 24-2, the slender round tube 1 26-1 and the slender round tube 2 26-2, the outer hook claw body 1 23-1 and the outer hook claw body 2 23-2 are respectively connected to the outer ports of the slender round tube 1 26-1 and the slender round tube 2 26-2, and the card body 22-2 and the card body 3 22-3 are respectively located on the slender round tube 1 26-1, the slender round tube 2 26-2 and the vertebral base tube body 1 2 4-1, at the outer port of the vertebral bottom tube body 24-2, the sliding tube body 19-1 and the sliding tube body 2 19-2 are composed of a conventional round tube 1 20-1, a T-mouth round tube 20-2, a ball 20-3, an L-shaped round tube 20-4 and a conventional round tube 20-5. The conventional round tube 1 20-1 and the short round tube 23-1 on the right wing sliding tube 13-3 and the left wing sliding tube 13-1 are sleeved, and the conventional round tube 20-5 and the middle connecting tube 13-2 are sleeved with the vertebral bottom tube body 1 24-1 and the cone bottom tube body 24-2. Two L-shaped round tubes 20-4 with different diameters and placed oppositely are connected to the conventional round tube 1 20-1, the T-mouth round tube 20-2 is connected to the conventional round tube 20-5, and the T-mouth round tube 2 0-2 is located between two relatively L-shaped circular tubes 20-4, and a number of balls 20-3 are scattered therein, so that the T-mouth circular tube 20-2 and the L-shaped circular tube 20-4 can move relative to and toward each other more smoothly, and can also avoid the separation of the two circular tubes. The two ends of the inflatable airbag 1 18-1 and the inflatable airbag 2 18-2 are respectively fixed together with the conventional circular tube 1 20-1 and the conventional circular tube 2 20-5 of the sliding tube body 1 19-1 and the sliding tube body 2 19-2, and can change between the two states of the oblate body and the spherical body when the sliding tube body 1 19-1 and the sliding tube body 2 19-2 move toward or away from each other, thereby realizing the blocking of the cylindrical pipe 12 and the recovery of the recyclable water injection device 13.One end of the spring 1 21-1 and the spring 2 21-2 is wound around the vertebral bottom tube body of the left wing sliding tube 13-1 and the right wing sliding tube 13-3, and the other end is wound around the vertebral bottom tube body 1 24-1 and the cone bottom tube body 2 24-2 of the middle connecting tube 13-2, and is fixed by the clamp body 1 22-1, the clamp body 2 22-2, the clamp body 3 22-3 and the clamp body 4 22-4.

[0043] The method for using the self-feedback recoverable enhanced coal seam seepage wetting of the present invention is as follows: first, a plurality of "pie"-shaped slits 3 with a distance of 10m and a diameter of 5m are drilled in the deep part of the conventional borehole 2, and then a horizontal detection hole 1 4-1 and a detection hole 2 4-2 with a diameter of 30cm are drilled at a horizontal position of 10m on both sides of the conventional borehole 2, and a detection hole 3 4-3, a detection hole 4-4, a detection hole 5 4-5, and a detection hole 6 4-6 are drilled at the horizontal positions of 5m and 10m on the right side of the detection hole 1 4-1 and on the left side of the detection hole 2 4-2, respectively, and a ground stress sensor 6 and a moisture sensor 7 are connected to the front end and the middle of the lead 5 respectively, and the lead 5 is sent to the corresponding detection holes in the six detection holes in turn. Position, the other end is connected to the display controller 8, the cylindrical pipe 12 with the "tire" type plug 9 and the "tire" type plug 2 9-2 is sent into the conventional borehole 2, the grouting pipe 10 is sent into the conventional borehole 2, so that the inner port of the grouting pipe 10 passes through the small pipe groove 39 of the "tire" type plug 9-1, and penetrates into the plugging area, the acid-resistant high-pressure pipe 14 passes through the recoverable water injection device 13, and is sent into the interior of the cylindrical pipe 12 together, so that the inflatable airbag 1 18-1 and the inflatable airbag 2 18-2 of the recoverable water injection device 13 are aligned with the inflatable ring tube 1 40-1 and the inflatable ring tube 2 40-2 respectively, and the front port of the acid-resistant high-pressure pipe 14 is 3 meters away from the "pie" shaped slit 10~20m, connect the acid-resistant leather hose 15-1 and the acid-resistant high-pressure pipeline 14, the acid-resistant leather hose 15-1 and the acid-resistant water injection pump 16 in sequence, connect the acid-resistant water pump 16 and the continuous water injection tank 17 with the acid-resistant leather hose 2 15-2, connect the display controller 8 with the recyclable water injection device 13, the stirring device 32, the water level monitor 33, the acid-resistant flow control valve 34-1, the common flow control valve 34-2, the acid-resistant valve 1 34-3 and the acid-resistant valve 2 34-4 respectively with the lead wire 5, turn the valve 11, press the plugging slurry from the grouting pipe 10 into the plugging area, and after the plugging slurry is completely solidified, start the control display 8, control the left wing sliding pipe 13-1 and the right wing sliding pipe 13-3 of the recyclable water injection device 13 to move toward the middle connecting pipe 13-2 at the same time, and the spring 1 21-1 and the spring 2 21-2 are squeezed to The middle part contracts, and at the same time, the conventional round tube 1 20-1 slides toward the conventional round tube 2 20-5, and the inflated airbag 1 18-1 and the inflated airbag 2 18-2 gradually change from a flat body to a spherical body. When the inner hook claw body 23-2 on the left wing sliding tube 13-1 and the right wing sliding tube 13-3 pass over the outer hook claw body 1 23-1 and the outer hook claw body 2 23-2 located on both sides of the middle connecting tube 13-2, the conventional round tube 1 20-145 degrees is rotated counterclockwise to align with the conventional round tube 2 20-5, so that the inner and outer hook claw bodies are engaged with each other, so as to achieve the stability of the inflated airbag 1 18-1 and the inflated airbag 2 18-2 and the complete filling of the inflated ring tube 1 40-1 and the inflated ring 2 40-2, and complete the sealing of the cylindrical pipe 12, adjust the control display 8, open the acid-resistant flow control valve 34-1 and the ordinary flow control valve 34-2,The acid container 30 and the water pipe 31 respectively inject a certain amount of acid and water into the acid-resistant water tank 28-2, and then start the stirring device 32 to stir the mixed liquid for 15 seconds. The control display 8 controls the opening of the acid-resistant valve 1 34-310 seconds to complete the transportation of the acid from the acid-resistant water tank 28-2 to the acid-resistant water tank 1 28-1. Subsequently, the control display 8 controls the opening of the acid-resistant valve 2 34-4 and the start of the acid-resistant water injection pump 16. The acid is injected into the borehole through the acid-resistant leather hose and the acid-resistant high-pressure pipeline 14. 2 and the "pancake" shaped slit 3, when the acid in the acid-resistant water tank 1 28-1 is lower than a certain limit, the water level monitor 33 transmits the water level signal to the control display 8, and then the control display 8 controls the acid flow control valve 34-1 and the common flow control valve 34-2, repeats the partial process in k~l, repeats the preparation of the acid in the acid-resistant water tank 2 28-2 and the transfer from the acid-resistant water tank 2 28-2 to the acid-resistant water tank 1 28-1, and finally completes the continuous water injection tank 17. At the same time, the ground stress sensors 6 and moisture sensors 7 of the detection hole 1 4-1, the detection hole 2 4-2, the detection hole 3 4-3, the detection hole 4-4, the detection hole 5 4-5 and the detection hole 6 4-6 transmit the infiltration and penetration information of the coal seam back through the lead 5. When the infiltration and wetting of the coal seam reach the ideal effect, the control display 8 turns off the sensors and valve switches, stops the preparation of acid and water injection operations, and adjusts the control display 8 to move inward and rotate clockwise to recover the injected The left wing sliding tube 8-1 and the right wing sliding tube 8-3 of the water device 13 are turned 45 degrees, and the spring 1 21-1 and the spring 2 21-2 are ejected outward by the elastic force, driving the conventional round tube 1 20-1 to slide back to the conventional round tube 2 20-5, and the inflated airbag 1 18-1 and the inflated airbag 2 18-2 are also restored from the spherical body to the oblate body, which is convenient for the recovery of the recyclable water injection device 13 and the acid-resistant high-pressure pipeline 14 together, thereby realizing the seepage wetting function of the system and completing the recovery of part of the device.

[0044] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A seepage wetting system for recoverable coal seams with self-feedback, the seepage wetting system comprising a monitoring system and a seepage wetting system for recoverable and enhanced coal seams, characterized in that: The monitoring system includes a stress sensor, a moisture sensor and a control display. Three detection holes are arranged on both sides of the borehole, and a lead is placed in each detection hole. Two groups of ground stress sensors and moisture sensors are arranged on each lead and are respectively placed at the front and middle positions of the borehole. The lead ends located outside the borehole are connected to the control display; the seepage wetting system of the recoverable enhanced coal seam includes a cylindrical pipe arranged in the borehole and provided with a tire-type plug 1 and a tire-type plug 2. A small pipe groove is arranged at the upper end of the tire-type plug 1. One end of the grouting pipe passes through the small pipe groove and goes deep into the grouting area. A valve is arranged at the other end. A recoverable water injection device is built in the cylindrical pipe. The recoverable water injection device is connected to an acid-resistant high-pressure pipe. A plurality of circular water outlet holes are arranged on the pipe wall at the end of the acid-resistant high-pressure pipe, and the other end is connected to the continuous water injection tank through an acid-resistant leather hose. An acid-resistant water injection pump is arranged in the middle of the acid-resistant high-pressure pipe. The recyclable water injection device comprises a left-wing sliding pipe, a sliding pipe body 1, a middle connecting pipe, a sliding pipe body 2 and a right-wing sliding pipe which are slidably sleeved in sequence. The recyclable water injection device is also provided with a spring 1, a spring 2, an inflatable airbag 1 and an inflatable airbag 2. The two ends of the spring 1 are respectively connected to the pipe bodies of the left-wing sliding pipe and the middle connecting pipe, and the two ends of the spring 2 are respectively connected to the pipe bodies of the middle connecting pipe and the right-wing sliding pipe. One set of the inflatable airbags is arranged on the sliding pipe body 1, and the second set of the inflatable airbags is arranged on the sliding pipe body 2. The left wing sliding tube and the right wing sliding tube have the same structure, and are both composed of a short round tube, an inner hook claw body, a long round tube, a connecting round tube and a vertebral bottom tube body. The connecting round tube connects the short round tube and the long round tube, and the inner hook claw body is connected to the long round tube. The middle connecting tube is composed of a second card body, a third card body, a vertebral bottom tube body, a second vertebral bottom tube body, a first outer hook claw body, a second outer hook claw body, a first slender round tube, a second slender round tube and a thick round tube. One end of the thick round tube is connected to the first vertebral bottom tube body and the first slender round tube, and the other end of the thick round tube is connected to the vertebral bottom tube body.

2. The outer hook claw body 1 and the outer hook claw body 2 are respectively connected to the outer ports of the slender round tube 1 and the slender round tube 2. The card body 2 and the card body 3 are respectively located on the slender round tube 1 and the slender round tube 2 and the outer ports of the vertebral bottom tube body 1 and the vertebral bottom tube body 2. The sliding tube body 1 and the sliding tube body 2 are composed of a conventional round tube 1, a T-mouth round tube, a ball, an L-shaped round tube and a conventional round tube 2. The conventional round tube 1 is sleeved with the short round tubes on the right wing sliding tube and the left wing sliding tube, and the conventional round tube 2 is connected to the middle The vertebral bottom tube body 1 and the cone bottom tube body 2 on the pipe are sleeved, two L-shaped round tubes with different diameters and placed oppositely are connected to the conventional round tube 1, and the T-mouth round tube is connected to the conventional round tube 2. The T-mouth round tube is located between the two relatively L-shaped round tubes, and a number of balls are scattered therein, so that the T-mouth round tube and the L-shaped round tube can move relative to and toward each other more smoothly, and can also avoid the separation of the two round tubes. The two ends of the inflatable airbag 1 and the inflatable airbag 2 are respectively connected to the conventional round tube 1 and the conventional round tube 2 of the sliding tube body 1 and the sliding tube body 2. The two circular tubes are fixed together and can change between the two states of the oblate body and the bulging spherical body when the sliding tube body one and the sliding tube body two move toward or away from each other, thereby realizing the blocking of the cylindrical pipeline and the recovery of the recyclable water injection device. One end of the spring one and the spring two are respectively fixed on the vertebral bottom tube body of the left wing sliding tube and the right wing sliding tube, and the other ends are respectively fixed on the vertebral bottom tube body one and the cone bottom tube body two of the middle connecting tube, and are fixed by the clamp body one, the clamp body two, the clamp body three and the clamp body four.

2. The self-feedback recoverable coal seam seepage wetting system according to claim 1 is characterized in that: The setting method of setting three detection holes on both sides of the borehole is as follows: detection hole one and detection hole two are set 10m on both sides of the borehole, detection hole three and detection hole five are set 5m and 10m away from the outside of detection hole one, and detection hole four and detection hole six are set 5m and 10m away from the outside of detection hole two.

3. The self-feedback recoverable coal seam seepage wetting system according to claim 2 is characterized in that: The tire-type plug 1 and the tire-type plug 2 are axially symmetrical objects, one side of which is composed of a circular ring body, a small-diameter arc surface, a large tube groove and a large-diameter arc surface. The large tube groove transversely penetrates the circular ring body, the large-diameter arc surface is circumscribed to the circular ring body and inscribed to the small-diameter arc surface, and the inner end of the small-diameter arc surface is connected to the large tube groove. The difference from the tire-type plug 2 is that the tire-type plug 1 is provided with a small tube groove on the upper part.

4. The self-feedback recoverable coal seam seepage wetting system according to claim 3 is characterized in that: The continuous water injection tank includes an acid-resistant water tank, a support frame, an acid liquid container, a water pipe, a stirring device and a water level monitor, wherein the acid-resistant water tank is placed on the support frame, the stirring device is connected directly above the acid-resistant water tank, a water pipe is inserted into the inside on the right side, an opening is provided on the left side, facing the acid liquid container connected to the support frame, and an acid-resistant flow control valve and a common flow control valve are provided on the acid liquid container and the water pipe respectively.

5. A method for using the seepage wetting system according to claim 4, firstly drilling a borehole in a coal wall, characterized in that: The method comprises the following steps: a. Drill several circular slits with a diameter of 5m and a distance of 10m in the deep part of the borehole; b. Drill horizontal detection holes 1 and 2 with a diameter of 30 cm at a horizontal position of 10 m on both sides of the borehole, and drill detection holes 3, 4, 5 and 6. Detection holes 3 and 5 are located 5 m and 10 m away from the outside of detection hole 1, respectively, and detection holes 4 and 6 are located 5 m and 10 m away from the outside of detection hole 2, respectively; c. Connect the ground stress sensor and moisture sensor to the front and middle of the lead respectively, and send them to the corresponding positions in the 6 detection holes in turn, and connect the other end to the control display; d. Insert the cylindrical pipe with a tire plug and a tire plug into the borehole; e. Send the grouting pipe into the borehole so that the inner port of the grouting pipe passes through the small pipe groove of the tire plug and penetrates into the plugging area; f. Pass the acid-resistant high-pressure pipe through the recyclable water injection device and send it into the cylindrical pipe together, so that the inflation airbag 1 and the inflation airbag 2 of the recyclable water injection device are aligned with the inflation ring tube 1 and the inflation ring tube 2 respectively, and the front end of the acid-resistant high-pressure pipe is 10~20m away from the circular pancake slit; g. Connect the acid-resistant leather hose, acid-resistant high-pressure pipeline, acid-resistant water pump and continuous water injection tank in sequence; h. Use leads to connect the control display to the recyclable water injection device, the stirring device, the water level monitor, and the acid-resistant flow control valve; i. Turn the valve to press the plugging slurry from the grouting pipe into the plugging area; j. After the plugging slurry is completely solidified, start the control display to control the left and right sliding tubes of the recyclable water injection device to move toward the middle connecting tube at the same time. The springs 1 and 2 are squeezed and contracted toward the middle. At the same time, the conventional round tube 1 slides toward the conventional round tube 2. The airbags 1 and 2 gradually change from oblate bodies to bulging spheres. When the inner hook claws on the left and right sliding tubes pass over the outer hook claws 1 and 2 located on both sides of the middle connecting tube, the conventional round tube 1 is rotated 45 degrees counterclockwise to align with the conventional round tube 2, so that the inner and outer hook claws are engaged with each other, so as to achieve the stability of the inflated airbags 1 and 2 and the complete filling of the inflated annular tubes 1 and 2, and complete the sealing of the cylindrical pipe; k. Control the control display, open the acid-resistant flow control valve and the ordinary flow control valve, the acid-resistant flow control valve and the ordinary flow control valve are respectively provided on the acid container and the water pipe, the acid container and the water pipe are respectively injected into the acid-resistant water tank with a certain amount of acid and water, and then start the stirring device to stir the mixed liquid for 15s; l. The control display controls the opening of the acid-resistant valve for 10 seconds to complete the delivery of acid from the acid-resistant water tank. Subsequently, the control display controls the opening of the acid-resistant valve and the start of the acid-resistant water injection pump. The acid is injected into the drill hole and the circular pancake-shaped cut through the acid-resistant leather hose and the acid-resistant high-pressure pipeline; m. When the acid in the acid-resistant water tank drops to the set acidity, the water level monitor transmits the water level signal to the control display, and then the control display controls the acid flow control valve and the common flow control valve, repeats part of the process from k to l, repeatedly completes the preparation and transfer of the acid in the acid-resistant water tank, and finally completes the continuous water injection operation of the continuous water injection tank; n. At the same time, the ground stress sensors and moisture sensors of the detection holes 1, 2, 3, 4, 5 and 6 transmit the infiltration and permeability information of the coal seam back through the leads; o. When the penetration and wetting of the coal seam reach the ideal effect, the control display shuts down the sensors and valve switches, and stops the preparation of acid and water injection operations; p. Adjust the control display, move the left and right wing sliding tubes of the recoverable water injection device inward and rotate them 45 degrees clockwise. Springs 1 and 2 are ejected outward by the elastic force, driving conventional round tube 1 to slide back toward conventional round tube 2. Airbags 1 and 2 are also restored from spherical bodies to oblate bodies, making it easy to recover the recoverable water injection device and the acid-resistant high-pressure pipeline together. In this way, the seepage wetting function of the system is realized and the recovery of part of the device is completed.

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