Drilling method for underground injection system for sealing mine water

Abstract

The present invention relates to a drilling method for an underground injection system for sealing mine water, comprising: determining the surface wellhead position of the injection well, drilling underground from the surface wellhead to a deep stratum, and burying a vertical screen pipe in the deep stratum; drilling a directional drill on the wall of the injection well in the direction of a coal seam tunnel, and drilling from the injection well to an end of the coal seam tunnel closest to the injection well; according to accurate position information of the coal seam tunnel itself, with the drilling direction from the injection well to the coal seam tunnel in step S2 as an aid, reverse drilling is performed from the coal seam tunnel to the side wall of the injection well, and the passage from the coal seam tunnel to the injection well is used as a water delivery passage, and a water delivery pipeline is laid; the position where the water delivery passage is connected to the injection well is set as a water injection wellhead, the surface wellhead is closed, and only a rope required for transportation is left to pass through, and the injection well portion above the water injection wellhead is used as a transportation section for the rope to pass through; when sealing the mine water, a monitoring and cleaning device is lowered from the wellhead of the injection well to the screen pipe section, so that sampling and cleaning of the inner wall of the screen pipe can be carried out in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of geological storage drilling, and in particular relates to a drilling method for an underground injection system for sealing mine water. Background Art

[0002] At present, geological storage injection wells are usually designed as vertical wells. The existing drilling method is to drill downward from the surface, and the wellhead is located on the surface. Coal mine water is mainly caused by the exposure of tunnels and the collapse of goaf areas that affect the water source. With the increase of mining area, the amount of mine water produced will increase rapidly. If the mine water is to be discharged on the surface, it needs to go through a complex water treatment procedure, which is time-consuming and economically expensive. At present, geological storage of mine roof water is an economical and effective treatment method, but if the mine water is pumped to the ground, after simple water treatment, it is transported to the vicinity of the injection well, and the mine water is injected into the injection well from the wellhead on the ground, it will eventually reach the deep underground strata to achieve geological storage. However, the extraction, treatment, and transportation of large amounts of mine water still consumes a lot of energy and is costly. Summary of the invention

[0003] In view of the above problems, the present invention provides a drilling method for an underground injection system for sealing mine water, comprising the following steps:

[0004] S1: Determine the location of the ground wellhead of the injection well through geological exploration, drill underground from the ground wellhead to the deep stratum, bury a vertical screen pipe in the deep stratum planned for sealing, and allow the mine water to enter the deep stratum through the sieve holes of the screen pipe;

[0005] S2: Directional drilling is performed on the wall of the injection well, toward the direction of the coal seam tunnel, from the injection well to the end of the coal seam tunnel closest to the injection well;

[0006] S3: Based on the accurate location information of the coal seam tunnel itself, and with the drilling direction from the injection well to the coal seam tunnel in step S2 as an aid, reverse drilling is performed from the coal seam tunnel to the side wall of the injection well, and the channel from the coal seam tunnel to the injection well is used as a water delivery channel, and a water delivery pipeline is laid;

[0007] S4: The position where the water delivery channel is connected to the injection well is set as the injection wellhead, the ground wellhead is closed, and only the rope required for transportation is left to pass through, and the injection well part above the injection wellhead is used as the transportation section for the rope to pass through;

[0008] S5: When sealing the mine water, the monitoring and cleaning device is lowered from the wellhead of the injection well to the screen section, which can take samples and clean the inner wall of the screen in real time.

[0009] Optionally, step S2 includes:

[0010] (1) Release the rope from the ground wellhead down along the injection well. The length of the released rope is equal to the vertical distance between the bottom surface of the coal seam tunnel near the injection well and the ground;

[0011] (2) A directional drill is set up with the side wall of the well corresponding to the bottom end of the rope in the injection well as the starting point, and the drill bit points to the direction of the end of the coal seam tunnel close to the injection well. The directional drill is connected to the control device on the ground. The control device controls the directional drill to drill along a straight line until it penetrates the end of the coal seam tunnel closest to the injection well.

[0012] Optionally, in step S3, the drilling direction from the injection well to the coal seam tunnel in step S2 is used as an auxiliary, specifically: since the injection well deviates from the vertical direction, the position of the starting point in step (2) is higher than the depth of the coal seam tunnel, and the channel drilled by the directional drill is a downward slanted line. If the mine water is transported from the bottom to the top, the energy consumption is relatively large. Therefore, this slanted line is not a water supply channel; starting from the end of the coal seam tunnel closest to the injection well, a water supply channel is drilled toward the injection well along the horizontal direction and on the same vertical plane as the channel drilled by the directional drill in step (2).

[0013] Optionally, in step S4, the position corresponding to the water injection wellhead is used as a dividing line, the well wall of the injection well at the dividing line is cut, a steel plate is set at the dividing line, the well portion above the steel plate is closed, and the upper edge of the well wall below the steel plate forms the water injection wellhead;

[0014] A winch is arranged next to the ground wellhead, and the winch is connected to the monitoring and cleaning device through a rope to control the lifting and lowering of the monitoring and cleaning device in the injection well; the ground wellhead is closed by a cover plate, and a through hole is provided at the center of the cover plate to allow the rope to pass through the cover plate.

[0015] Optionally, a water pump and a water pipe are provided in the water supply channel, and the water pipe is connected to the water injection wellhead to transport the mine water in the coal seam tunnel along the water pipe to the water injection wellhead; the water supply channel can accommodate operators to pass through the water supply channel from the coal seam tunnel to the water injection wellhead, so as to operate the monitoring and cleaning device next to the water injection wellhead.

[0016] Optionally, the monitoring and cleaning device includes a main box, a weight adjustment component and a winding machine, the main box is cylindrical, and an upper water tank, a middle water tank and a lower water tank are arranged inside from top to bottom; a waterproof shell protruding upward is provided at the center of the top of the main box, and a driving motor is arranged inside the waterproof shell;

[0017] A cavity is provided in the center of the main box body, the top of which is connected to the inside of the waterproof shell and the bottom is open. A cleaning component is provided in the cavity, and the top of the cleaning component is connected to the rotating shaft of the driving motor. The driving motor can drive the cleaning component to rotate and extend out of the main box body to clean the inner wall of the screen tube below the main box body.

[0018] Further optionally, the weight adjustment component includes a traction rope and a plurality of weight blocks, the weight blocks are annular and made of stainless steel, the inner diameter of the central through hole of the weight block is larger than the outer diameter of the waterproof shell, so that the weight block can be sleeved on the outside of the waterproof shell;

[0019] The traction rope passes through the central through hole of the weight block and ties one side of the weight block. Several weight blocks are tied in sequence along the length direction of the traction rope, and the traction rope is tied at the corresponding position on the same side of each weight block, so that each weight block is hung on the traction rope in the same posture.

[0020] Optionally, in step S5, a winch at the wellhead on the ground lowers a rope into the injection well, and the bottom end of the rope is lowered above the wellhead. The bottom end of the rope is manually controlled to pass through the central through holes of all weight blocks from top to bottom in sequence, and the traction rope is on one side of the rope. Then, the top of the main box waterproof shell is connected to the bottom end of the rope;

[0021] Then, the rope and the traction rope continue to be lowered along the injection well at the same speed until the liquid level of the screen section.

[0022] Optionally, the upper water tank, the middle water tank, the lower water tank and the cavity are arranged concentrically with the main box body; in conjunction with the cavity in the center of the main box body, the cross-sections of the upper water tank, the middle water tank and the lower water tank are all circular;

[0023] The main box is provided with three vertical water inlet pipes, the angle between the line connecting two adjacent water inlet pipes and the center of the main box is 120°, and the three water inlet pipes form a circle with the center of the main box as the center;

[0024] The top ends of the three water inlet pipes all pass through the top surface of the main box body for taking water samples, and the bottom ends of the three water inlet pipes extend to the interior of the upper water tank, the middle water tank, and the lower water tank respectively, so that the water in the screen tube section enters the corresponding water tank through each water inlet pipe.

[0025] Optionally, in step S5, when it is necessary to detect the water quality in the screen tube section, the main box and the weight blocks are lowered synchronously. When the main box cannot continue to sink due to the buoyancy caused by the vacancy inside the main box, the lowering of the main box is stopped, the winding machine is started, and the weight blocks are lowered. As the number of weight blocks falling on the main box increases, the main box can continue to sink.

[0026] When it sinks to the upper part of the screen tube section, the water inlet pipe corresponding to the upper water tank is opened, and the water enters the upper water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0027] When the main box body sinks to the middle of the screen tube section, the water inlet pipe corresponding to the intermediate water tank is opened, and water enters the intermediate water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0028] When the main box sinks to the bottom of the screen tube section, the water inlet pipe of the corresponding lower water tank is opened, and water enters the lower water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0029] The winch and winder pull the main box and weight blocks up to the water injection wellhead, remove the main box, and then take out water samples for testing. The number, weight and spacing of the weight blocks are determined according to the actual operation.

[0030] Optionally, the cleaning component includes a rotating shaft and a plurality of brushes, the top end of the rotating shaft is connected to the rotating shaft of the driving motor, and the plurality of brushes are evenly distributed along the length direction and circumference direction of the rotating shaft;

[0031] The main rod of the brush is hinged on the rotating shaft, the bristles are evenly and densely distributed on the main rod, and each brush is provided with a spring which is transversely connected between the main rod and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a drilling method provided in an embodiment;

[0033] Figure 2 This is a schematic diagram of the main box;

[0034] Figure 3 A schematic top view of the main box;

[0035] Figure 4 A schematic diagram of the cleaning components;

[0036] Figure 5 is a schematic diagram of a weight block;

[0037] Figure 6 It is a schematic diagram of sealing manhole cover one and sealing manhole cover two.

[0038] In the accompanying drawings, 1-injection well, 2-ground wellhead, 3-water injection wellhead, 4-screen section, 5-coal seam tunnel, 6-water delivery channel, 7-main box, 8-telescopic device, 9-upper water tank, 10-middle water tank, 11-lower water tank, 12-waterproof shell, 13-sealed manhole cover 2, 14-cavity, 15-cleaning component, 16-traction rope, 17-weight block, 18-water inlet pipe, 19-rotating shaft, 20-brush, 21-spring, 22-sealed manhole cover 1. DETAILED DESCRIPTION

[0039] This embodiment provides a method for drilling an underground injection system for sealing mine water, such as Figure 1-Figure 6 As shown, the following steps are included:

[0040] S1: Determine the location of the surface wellhead 2 of the injection well 1 through geological exploration, drill underground from the surface wellhead 2 to the deep stratum, bury a vertical screen pipe in the deep stratum planned for sealing, and allow the mine water to enter the deep stratum through the sieve holes of the screen pipe;

[0041] S2: Directional drilling is performed on the wall of the injection well 1, toward the direction of the coal seam tunnel 5, from the injection well 1 to the end of the coal seam tunnel 5 closest to the injection well;

[0042] S3: Based on the accurate position information of the coal seam tunnel itself, and with the drilling direction from the injection well to the coal seam tunnel in step S2 as an aid, reverse drilling is performed from the coal seam tunnel 5 to the side wall of the injection well, and the channel from the coal seam tunnel to the injection well is used as the water delivery channel 5, and a water delivery pipeline is laid;

[0043] S4: The position where the water delivery channel 5 is connected to the injection well is set as the water injection wellhead 3, the ground wellhead 2 is closed, and only the rope required for transportation is left to pass through, and the injection well part above the water injection wellhead 3 is used as the transportation section for the rope to pass through;

[0044] S5: When sealing the mine water, the monitoring and cleaning device is lowered from the wellhead of the injection well to the screen section 4, which can take samples and clean the inner wall of the screen in real time.

[0045] In step S1, drilling and setting up an injection well is performed according to the existing technology. The injection well is provided with three well sections from top to bottom. The upper two well sections are completed by cementing wells, and the lowest well section corresponding to the deep formation uses a screen pipe. The side wall of the screen pipe is evenly and densely covered with screen holes, so that the mine water injected along the injection well can enter the deep formation through the screen holes to achieve sealing.

[0046] The present invention creatively proposes in steps S2, S3, and S4 that a water delivery channel 5 is opened between the coal seam tunnel and the injection well, abandoning the traditional ground wellhead 2 injection form, and directly diverting the mine water in the coal seam tunnel to the underground water injection wellhead 3 through the water delivery channel 5, and then injecting it into the injection well. This form saves the energy consumption of transferring mine water to the ground, and can also simultaneously save the ground facilities and investment for transporting or transferring and treating mine water, saving ground area.

[0047] There are two forms of drilling the water delivery channel 5: one is to drill from the coal seam tunnel to the injection well, and the other is to drill from the injection well to the coal seam tunnel. Since the coal seam tunnel is in the shallow or middle underground strata and the position coordinates are accurate, the water delivery channel 5 is generally drilled from the coal seam tunnel to the injection well. However, the current drilling technology for the injection well can only be done from the ground wellhead downward. The current highest precision target range of domestic drilling construction is 5m. Although the injection well drilling process uses low drilling pressure and fast speed to control the well inclination, the actual drilling has well inclination, and it is impossible to ensure complete vertical drilling, which will cause the injection well to deviate from the vertical direction. Since the length of the injection well is generally more than a kilometer, a small angle of inclination may cause a large overall deviation. Although the deviation angle will be measured and corrected many times during the drilling process, the various parts of the injection well will still have well inclination, the actual wellbore orientation will change, and there are errors in the measurement and positioning, and the position of the injection well in a certain depth range underground cannot be determined. Therefore, it is difficult to accurately find the location of the injection well corresponding to the coal seam tunnel, and one can only use trial and error, which prolongs the construction period and wastes construction-related resources.

[0048] The present invention adopts the second form mentioned above. After the injection well is drilled, a directional drill is drilled from the injection well toward the direction of the coal seam tunnel. The directional drilling equipment is much smaller than the injection well drilling equipment and is suitable for drilling small holes underground (the hole diameter is smaller than the inner diameter of the injection well). Since the starting point is determined (although the position coordinates are inaccurate, the source position of the directional drilling rig is determined), the position coordinates of the end point (coal seam tunnel) are also determined, which is equivalent to determining the two endpoints. The detailed operation of step S2 is described below.

[0049] Optionally, step S2 includes:

[0050] (1) Release the rope from the ground wellhead 2 downward along the injection well. The length of the released rope is the vertical distance between the bottom surface of the coal seam tunnel near the injection well and the ground;

[0051] (2) A directional drill is set up with the side wall of the well corresponding to the bottom end of the rope in the injection well as the starting point, and the drill bit points to the direction of the end of the coal seam tunnel close to the injection well. The directional drill is connected to the control device on the ground. The control device controls the directional drill to drill along a straight line until it penetrates the end of the coal seam tunnel closest to the injection well.

[0052] Optionally, in step S3, the drilling direction from the injection well to the coal seam tunnel in step S2 is used as an auxiliary, specifically: since the injection well deviates from the vertical direction, the position of the starting point in step (2) is higher than the depth of the coal seam tunnel, and the channel drilled by the directional drill is a downward slanted line. If the mine water is transported from the bottom to the top, the energy consumption is relatively large. Therefore, this slanted line is not the water supply channel 5; starting from the end of the coal seam tunnel closest to the injection well, the water supply channel 5 is drilled toward the injection well along the horizontal direction and on the same vertical plane as the channel drilled by the directional drill in step (2).

[0053] According to the method of steps S2 and S3, starting from the injection well, only one channel needs to be drilled toward the coal seam tunnel to make an auxiliary line, and then starting from the coal seam tunnel, with the help of the auxiliary line, a water delivery channel 5 connected to the injection well can be drilled.

[0054] Optionally, in step S4, the position corresponding to the water injection wellhead 3 is used as a dividing line, the well wall of the injection well at the dividing line is cut, a steel plate is set at the dividing line, the well portion above the steel plate is closed, and the upper edge of the well wall below the steel plate forms a water injection wellhead; a through hole is set at the center of the steel plate, so that the rope connected to the monitoring and cleaning device passes through the steel plate;

[0055] A winch is arranged next to the ground wellhead 2, and the winch is connected to the monitoring and cleaning device through a rope to control the lifting and lowering of the monitoring and cleaning device in the injection well; the ground wellhead 2 is closed by a cover plate, and a through hole is arranged at the center of the cover plate to allow the rope to pass through the cover plate.

[0056] Optionally, a water pump and a water pipe are provided in the water supply channel 5, and the water supply pipe is connected to the water injection wellhead 3, so as to transport the mine water in the coal seam tunnel along the water supply pipe to the water injection wellhead 3; the water supply channel 5 can accommodate operators to pass through the water supply channel 5 from the coal seam tunnel to the water injection wellhead 3, so as to operate the monitoring and cleaning device next to the water injection wellhead 3.

[0057] Optionally, the monitoring and cleaning device includes a main box 7, a weight adjustment component and a winding machine, the main box 7 is cylindrical, and an upper water tank 9, a middle water tank 10 and a lower water tank 11 are arranged inside from top to bottom; a waterproof shell 12 protruding upward is arranged at the center of the top of the main box 7, and a driving motor is arranged inside the waterproof shell 12;

[0058] A cavity 14 is provided in the center of the main box body 7, the top of which is connected to the interior of the waterproof shell 12 and the bottom is open. A cleaning component 15 is provided in the cavity 14, and the top of the cleaning component 15 is connected to the rotating shaft of the driving motor. The driving motor can drive the cleaning component 15 to rotate and extend out of the main box body 7 to clean the inner wall of the screen tube below the main box body 7.

[0059] The driving motor may be provided with a rechargeable battery or may be provided with an electric wire, wherein the electric wire and the rope extend together to the ground and are then connected to a power source.

[0060] Further optionally, the weight adjustment component includes a traction rope 16 and a plurality of weight blocks 17, the weight block 17 is annular and made of stainless steel, and the inner diameter of the central through hole of the weight block 17 is larger than the outer diameter of the waterproof shell 12, so that the weight block 17 can be sleeved on the outside of the waterproof shell 12;

[0061] The traction rope 16 passes through the central through hole of the weight block 17 and ties one side of the weight block 17. Several weight blocks 17 are tied in sequence along the length direction of the traction rope 16, and the traction rope 16 is tied at the corresponding position on the same side of each weight block 17, so that each weight block 17 is suspended on the traction rope 16 in the same posture.

[0062] Further optionally, the winding machine is arranged beside the water injection wellhead 3, and a fixed pulley is arranged above the center of the water injection wellhead 3, and the fixed pulley is connected to the side wall rock surface of the injection well above the water injection wellhead 3 through a connecting rod to fix the position of the fixed pulley;

[0063] One end of the traction rope 16 is connected to a winding machine, and the traction rope 16 is wound on the winding machine and then lowered into the water injection wellhead 3 after passing through a fixed pulley.

[0064] Optionally, in step S5, the winch of the wellhead 2 on the ground lowers the rope into the injection well, the bottom end of the rope is lowered to the top of the water injection wellhead 3, and the bottom end of the rope is manually controlled to pass through the central through holes of all the weight blocks 17 from top to bottom in sequence, the traction rope 16 is on one side of the rope, and then, the top of the waterproof shell 12 of the main box 7 is connected to the bottom end of the rope; the lowest weight block 17 can be suspended above the main box 7, or can be sleeved on the outside of the waterproof shell 12 and placed on the upper surface of the main box 7;

[0065] Then, the rope and the traction rope 16 continue to be lowered along the injection well at the same speed until the liquid level of the screen section 4.

[0066] Optionally, the upper water tank 9, the middle water tank 10, the lower water tank 11 and the cavity 14 are arranged concentrically with the main box body 7; in conjunction with the cavity 14 in the center of the main box body 7, the cross-sections of the upper water tank 9, the middle water tank 10 and the lower water tank 11 are all circular;

[0067] The main box 7 is provided with three vertical water inlet pipes 18, the angle between the line connecting two adjacent water inlet pipes and the center of the main box 7 is 120°, and the three water inlet pipes form a circle with the center of the main box 7 as the center;

[0068] The top ends of the three water inlet pipes all pass through the top surface of the main box body 7 for taking water samples, and the bottom ends of the three water inlet pipes extend to the interior of the upper water tank 9, the middle water tank 10, and the lower water tank 11 respectively, so that the water in the screen tube section 4 enters the corresponding water tank through each water inlet pipe.

[0069] Preferably, the three water inlet pipes are each provided with a switch valve at their pipe openings to facilitate controlling the switch of the water inlet pipes.

[0070] The three water inlet pipes in a circle form a limiting circle on the top surface of the main box body 7 to prevent the weight block 17 falling on the top surface of the main box body 7 from having a large position deviation, and the weight block 17 will not go over the water inlet pipe.

[0071] Optionally, in step S5, when it is necessary to detect the water quality in the screen tube section 4, the main box 7 and the weight block 17 are lowered synchronously. Since the main box 7 is empty inside and the buoyancy makes the main box 7 unable to continue to sink, the lowering of the main box 7 is stopped, the winding machine is started, and the weight block 17 is lowered. As the number of weight blocks 17 falling on the main box 7 increases, the main box 7 can continue to be lowered and sink;

[0072] When it sinks to the upper part of the screen tube section 4, the water inlet pipe corresponding to the upper water tank 9 is opened, and the water enters the upper water tank 9. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0073] When the main box body 7 sinks to the middle of the screen tube section 4, the water inlet pipe corresponding to the intermediate water tank 10 is opened, and the water enters the intermediate water tank 10. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0074] When the main box body 7 sinks to the bottom of the screen tube section 4, the water inlet pipe corresponding to the lower water tank 11 is opened, and the water enters the lower water tank 11. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed;

[0075] The hoist and the winder pull the main box 7 and the weight block 17 up to the water injection wellhead 3, remove the main box 7, and then take out water samples for testing. The switch valves of the three water inlet pipes can be connected to the control device on the ground to control the opening and closing of each switch valve.

[0076] Optionally, the cleaning component 15 includes a rotating shaft 19 and a plurality of brushes 20, the top end of the rotating shaft 19 is connected to the rotating shaft of the driving motor, and the plurality of brushes 20 are evenly distributed along the length direction and circumference direction of the rotating shaft 19;

[0077] The main rod of the brush 20 is hinged on the rotating shaft 19 , and the bristles are evenly and densely distributed on the main rod. Each brush 20 is provided with a spring 21 , and the spring 21 is transversely connected between the main rod and the rotating shaft 19 .

[0078] Optionally, continuous threads are evenly arranged on the inner wall of the cavity 14 of the main box body 7, and the shaft of the drive motor can not only rotate but also extend and retract up and down, and the drive motor is communicatively connected to the control device of the ground or the water injection wellhead 3.

[0079] The mine water is directly discharged into the injection well without being treated by the water treatment device on the ground. The poor water quality makes the fouling and blockage of the screen pipe section 4 more serious. In step S5, when the water quality test shows that the water quality is poor, the inner wall of the screen tube section 4 should be cleaned. When the cleaning component 15 is inside the cavity 14 of the main box 7, the spring 21 is compressed, the bottom end of the brush 20 is close to the rotating shaft 19, and the cleaning component 15 is in a closed state; when the inner wall of the screen tube section 4 needs to be cleaned, the driving motor is started to drive the rotating shaft 19 to rotate and push the cleaning component 15 downward at the same time. The cleaning component 15 moves downward in a spiral in the cavity 14, and the bottom end of the brush 20 also moves downward in a spiral along the internal thread of the cavity 14. After the cleaning component 15 extends out of the cavity 14, the spring 21 resumes its natural extension state and pushes the brush 20 open. The cleaning component 15 opens in an umbrella shape, and the brush 20 contacts the inner wall of the screen tube section 4. The driving motor continues to drive the cleaning component 15 to rotate to clean the inner wall. At the same time, it can also cooperate with the up and down movement of the main box 7 to clean different positions of the screen tube section 4.

[0080] The main box body 7 of the present invention is placed flat below the liquid level of the screen tube section 4, and a portion of air is sealed in the cavity 14, so that the water body is separated from the rotating shaft of the drive motor, and there is no need to worry about water entering the drive motor from the cavity 14.

[0081] When the cleaning component 15 is rotated, since the main box body 7 is not fixed itself, the main box body 7 will also rotate. However, under the action of its own weight (and the large diameter of the main box body 7), the resistance to the rotation of the main box body 7 is greater than the resistance to the rotation of the cleaning component 15. There is relative rotation between the cleaning component 15 and the main box body 7 (especially when the main box body 7 is filled with water samples), and the cleaning component 15 can rotate and extend out of the cavity 14.

[0082] Optionally, an openable and closable sealing manhole cover 22 is provided at the water injection wellhead, the sealing manhole cover 22 is connected to an air pipe, a pressurizing device and a pressure reducing device are provided in the water delivery channel next to the water injection wellhead, and the air pipe is connected in parallel with the pressurizing device and the pressure reducing device to pressurize or reduce the pressure of the well section between the sealing manhole cover 1 and the sealing manhole cover 2;

[0083] An openable and closable sealing manhole cover 2 13 is provided below the sealing manhole cover 1. The sealing manhole cover 2 13 includes at least two cover plates, one side of which is hinged to the well wall and the other side is a free side. At least two telescopic devices 8 are provided on the well wall above the sealing manhole cover 2. The telescopic devices correspond to the cover plates one by one. The rod heads of the telescopic rods of the telescopic devices are hinged to the free sides of the cover plates. The corresponding cover plates are driven to flip down and lift up through the telescopic movement of the telescopic rods. After the cover plates are lifted up, the entire sealing manhole cover 2 is formed to close the cross section of the perfusion well.

[0084] The telescopic device can be a hydraulic cylinder with a waterproof shell. The hydraulic cylinder is electrically connected to a controller in the water delivery channel, or is communicatively connected to a controller on the ground.

[0085] Further optionally, a through hole is provided in the center of the sealing manhole cover 1, so that the rope and the traction rope can pass through the sealing manhole cover 1; since the operator can operate the sealing manhole cover 1 next to the water injection wellhead, the form of the sealing manhole cover 1 is not limited, as long as it can be opened and closed and can seal the water injection wellhead, and a sealing gasket is provided at the central through hole;

[0086] A barometer is respectively arranged on the well wall above and below the second sealed well cover, and the barometer is communicatively connected to a controller in the water delivery channel or a controller on the ground.

[0087] The water delivery pipeline of the water delivery channel passes through the well wall under the water injection well mouth and injects mine water into the injection well. When the mine water is injected, there is a certain pressure. At this time, the sealing well cover 1 is closed and the sealing well cover 2 is opened. The main box and the weight block are suspended between the sealing well cover 1 and the sealing well cover 2. The well section below the water injection well mouth has pressure, so that the mine water can enter the deep formation. Through the winch and the winding machine, the main box and the weight block can also be raised and lowered to complete the work of taking water samples and / or cleaning the inner wall of the screen tube section.

[0088] When it is necessary to take out the water sample from the main box, stop injecting mine water, raise the main box and the weight block to above the sealed manhole cover 2, close the sealed manhole cover 2, keep the sealed manhole cover 1 closed, start the pressure reducing device, use the air pipe to extract the air between the sealed manhole cover 1 and the sealed manhole cover 2, and reduce the pressure of the well section; when the pressure of the well section drops to normal pressure, close the pressure reducing device, open the sealed manhole cover 1, take out the main box, take out the water sample and clean the parts; then, lower the main box and the weight block to between the sealed manhole cover 1 and the sealed manhole cover 2, and close the sealed manhole cover 1; start the pressurizing device, use the air pipe to inflate and pressurize the well section between the sealed manhole cover 1 and the sealed manhole cover 2 until the air pressure above and below the sealed manhole cover 2 is similar, then open the sealed manhole cover 2, and continue to inject mine water.

Claims

1. A method for drilling an underground injection system for sealing mine water, characterized in that: The following steps are involved: S1: Determine the location of the ground wellhead of the injection well through geological exploration, drill underground from the ground wellhead to the deep stratum, bury a vertical screen pipe in the deep stratum planned for sealing, and allow the mine water to enter the deep stratum through the sieve holes of the screen pipe; S2: Directional drilling is performed on the wall of the injection well, toward the direction of the coal seam tunnel, from the injection well to the end of the coal seam tunnel closest to the injection well; S3: Based on the accurate location information of the coal seam tunnel itself, and with the drilling direction from the injection well to the coal seam tunnel in step S2 as an aid, reverse drilling is performed from the coal seam tunnel to the side wall of the injection well, and the channel from the coal seam tunnel to the injection well is used as a water delivery channel, and a water delivery pipeline is laid; S4: The position where the water delivery channel is connected to the injection well is set as the injection wellhead, the ground wellhead is closed, and only the rope required for transportation is left to pass through, and the injection well part above the injection wellhead is used as the transportation section for the rope to pass through; S5: When sealing the mine water, the monitoring and cleaning device is lowered from the wellhead of the injection well to the screen section, which can take samples and clean the inner wall of the screen in real time.

2. The drilling method of the underground injection system for sealing mine water according to claim 1, characterized in that: Step S2 includes: (1) Release the rope from the ground wellhead down along the injection well. The length of the released rope is equal to the vertical distance between the bottom surface of the coal seam tunnel near the injection well and the ground; (2) A directional drill is set up with the side wall of the well corresponding to the bottom end of the rope in the injection well as the starting point, and the drill bit points to the direction of the end of the coal seam tunnel close to the injection well. The directional drill is connected to the control device on the ground. The control device controls the directional drill to drill along a straight line until it penetrates the end of the coal seam tunnel closest to the injection well.

3. The drilling method of the underground injection system for sealing mine water according to claim 2, characterized in that: In step S3, the drilling direction from the injection well to the coal seam tunnel in step S2 is used as an auxiliary, specifically: since the injection well deviates from the vertical direction, the position of the starting point in step (2) is higher than the depth of the coal seam tunnel, and the channel drilled by the directional drill is a downward slanting line; starting from the end of the coal seam tunnel closest to the injection well, a water supply channel is drilled toward the injection well along the horizontal direction and on the same vertical plane as the channel drilled by the directional drill in step (2).

4. The drilling method of the underground injection system for sealing mine water according to claim 1, characterized in that: In step S4, the position corresponding to the water injection wellhead is used as a dividing line, the well wall of the injection well at the dividing line is cut, a steel plate is set at the dividing line, the well portion above the steel plate is closed, and the upper edge of the well wall below the steel plate forms the water injection wellhead; A winch is arranged next to the ground wellhead, and the winch is connected to the monitoring and cleaning device through a rope to control the lifting and lowering of the monitoring and cleaning device in the injection well; the ground wellhead is closed by a cover plate, and a through hole is provided at the center of the cover plate to allow the rope to pass through the cover plate.

5. The drilling method of the underground injection system for sealing mine water according to claim 4, characterized in that: A water pump and a water pipe are provided in the water supply channel, and the water supply pipe is connected to the water injection wellhead to transport the mine water in the coal seam tunnel along the water supply pipe to the water injection wellhead; the water supply channel can accommodate operators to pass through the water supply channel from the coal seam tunnel to the water injection wellhead, so as to operate the monitoring and cleaning device next to the water injection wellhead.

6. The drilling method of the underground injection system for sealing mine water according to claim 5, characterized in that: The monitoring and cleaning device comprises a main box, a weight adjustment component and a winding machine. The main box is cylindrical and has an upper water tank, a middle water tank and a lower water tank arranged from top to bottom. A waterproof shell protruding upward is arranged at the center of the top of the main box, and a driving motor is arranged in the waterproof shell. A cavity is provided in the center of the main box body, the top of which is connected to the inside of the waterproof shell and the bottom is open. A cleaning component is provided in the cavity, and the top of the cleaning component is connected to the rotating shaft of the driving motor. The driving motor can drive the cleaning component to rotate and extend out of the main box body to clean the inner wall of the screen tube below the main box body.

7. The drilling method of the underground injection system for sealing mine water according to claim 6, characterized in that: The weight adjustment component includes a traction rope and a plurality of weight blocks, the weight blocks are annular and made of stainless steel, the inner diameter of the central through hole of the weight block is larger than the outer diameter of the waterproof shell, so that the weight block can be sleeved on the outside of the waterproof shell; The traction rope passes through the central through hole of the weight block and ties one side of the weight block. Several weight blocks are tied in sequence along the length direction of the traction rope, and the traction rope is tied at the corresponding position on the same side of each weight block, so that each weight block is hung on the traction rope in the same posture.

8. The drilling method of the underground injection system for sealing mine water according to claim 7, characterized in that: The upper water tank, middle water tank, lower water tank and cavity are arranged concentrically with the main box body; in conjunction with the cavity in the center of the main box body, the cross-sections of the upper water tank, middle water tank and lower water tank are all circular; The main box is provided with three vertical water inlet pipes, the angle between the line connecting two adjacent water inlet pipes and the center of the main box is 120°, and the three water inlet pipes form a circle with the center of the main box as the center; The top ends of the three water inlet pipes all pass through the top surface of the main box body for taking water samples, and the bottom ends of the three water inlet pipes extend to the interior of the upper water tank, the middle water tank, and the lower water tank respectively, so that the water in the screen tube section enters the corresponding water tank through each water inlet pipe.

9. The drilling method of the underground injection system for sealing mine water according to claim 8, characterized in that: The cleaning component comprises a rotating shaft and a plurality of brushes, the top end of the rotating shaft is connected to the rotating shaft of the driving motor, and the plurality of brushes are evenly distributed along the length direction and circumference direction of the rotating shaft; The main rod of the brush is hinged on the rotating shaft, the bristles are evenly and densely distributed on the main rod, and each brush is provided with a spring which is transversely connected between the main rod and the rotating shaft.

10. The drilling method of the underground injection system for sealing mine water according to claim 7, characterized in that: In step S5, the winch at the wellhead on the ground lowers the rope into the injection well, and the bottom end of the rope is lowered above the water injection wellhead. The bottom end of the rope is manually controlled to pass through the central through holes of all weight blocks from top to bottom in sequence, and the traction rope is on one side of the rope. Then, the top of the main box waterproof shell is connected to the bottom end of the rope; Then, the rope and the traction rope continue to be lowered along the injection well at the same speed until the liquid level of the screen section; When it is necessary to test the water quality in the screen section, the main box and the weight blocks are lowered simultaneously. Since the main box is empty inside and the buoyancy makes the main box unable to continue to sink, the lowering of the main box is stopped, the winding machine is started, and the weight blocks are lowered. As the number of weight blocks falling on the main box increases, the main box can continue to sink; When it sinks to the upper part of the screen tube section, the water inlet pipe corresponding to the upper water tank is opened, and the water enters the upper water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed; When the main box body sinks to the middle of the screen tube section, the water inlet pipe corresponding to the intermediate water tank is opened, and water enters the intermediate water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed; When the main box sinks to the bottom of the screen tube section, the water inlet pipe of the corresponding lower water tank is opened, and water enters the lower water tank. After the sampling is completed, the switch valve of the corresponding water inlet pipe is closed; The winch and winder pull the main box and weight block up to the water injection wellhead, remove the main box, and then take out water samples for testing.

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