A mine downhole water detection and blowout prevention system and method

Abstract

A mine downhole water exploration and water discharge blowout prevention system, including orifice pipe, hole pipe, sealing part, drill pipe, drainage unit, water plugging unit, pressure gauge, grouting unit and control unit, the drainage unit and the water plugging unit are located below the hole pipe, and the inside is provided with a propelling element, a spring, a baffle and a steel ball, which can realize the upward or downward movement of the steel ball under the action of the control unit, thereby realizing the drainage or water plugging operation. The system creatively designs all the opening and closing valves on the side of the hole pipe. Compared with the traditional straight drilling bottom construction method, the side operation can greatly improve the safety protection of the construction personnel. Secondly, on the basis of designing the opening and closing valves on the side, the short stroke spring ball is designed to realize the rapid closing of the drill hole, and the steel ball closing drill hole mode fully utilizes the natural impact force of water flow. Compared with the current complex structure closing drill hole mode, the structure is optimized, and the sealing effect is improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent safety control technology in mines, specifically to a mine underground water exploration and drainage blowout prevention system and method. Background Technology

[0002] Coal mines and metal and non-metal mines are important components of global resource supply, and underground water exploration and drainage is a crucial step in the safe extraction of these resources. However, during water exploration and drainage operations, due to factors such as groundwater pressure and rock strata stability, high-pressure water drilling is prone to problems such as blowouts, drill bit jacking, and pipe bursts, causing huge economic losses to underground operations and even casualties among construction workers.

[0003] In traditional high-pressure water drilling operations, blowout at the borehole opening and drill bit jacking are serious technical problems. Existing blowout prevention measures are often ineffective or too complex to quickly and effectively stop blowout at the borehole opening, leading to drill bit jacking or even pipe bursting, which affects subsequent grouting operations after borehole sealing.

[0004] Currently, some borehole blowout preventers exist on the market, but these devices have some shortcomings in preventing wellhead blowouts. Some devices are weak in responding to high-pressure water and cannot quickly take measures to seal and control the flow. Other devices cannot immediately inject grout to stop the water flow after sealing. In addition, existing devices have complex structures and are cumbersome to operate, increasing the difficulty and risk of operations.

[0005] Based on years of design experience, the inventors designed a brand-new blowout prevention system that focuses on the safety and efficiency of downhole operations. This system can effectively prevent blowouts and also allow for the continuation of grouting operations. Summary of the Invention

[0006] To address the technical problems existing in the background art, the present invention provides a mine underground water exploration and drainage blowout prevention system.

[0007] The technical solution of this invention is as follows:

[0008] A blowout prevention system for underground water exploration and drainage in mines includes:

[0009] The borehole pipe is fixed inside the borehole opening;

[0010] The outer tube is connected to the outside of the orifice tube at the front, and the outer wall has a first side opening and a second side opening from front to back.

[0011] The sealing part is connected to the rear of the outer tube and has a through-hole to accommodate the drill rod. A sealing ring is provided at one end near the outer tube.

[0012] The drill pipe, located on one side of the sealing part, can pass through the sealing part and the outer tube to enter the orifice tube;

[0013] The drainage unit is connected to the first side opening and includes a first branch pipe and a drain pipe. One end of the first branch pipe is connected to the external pipe and the other end is connected to a first pusher. One end of the drain pipe is connected to one side of the first branch pipe and the other end is inclined downward.

[0014] The first pusher is connected to a first spring and a first baffle on the side of the outer tube near the hole. The size of the first baffle matches the inner diameter of the first branch pipe. A sealing element is provided on the outer ring. A first steel ball is placed between the first baffle and the first side opening. The size of the first steel ball is larger than the size of the first side opening and the size of the drain pipe. The first steel ball can block the first side opening under the push of the first pusher.

[0015] The water-blocking unit, connected to the second side opening, includes a second branch pipe. One end of the second branch pipe is connected to the outer pipe of the borehole, and the other end is connected to a second propulsion component. The second propulsion component is connected to a second spring and a second baffle on the side near the outer pipe of the borehole. The size of the second baffle matches the inner diameter of the second branch pipe. A sealing component is provided on the outer ring. A second steel ball is placed between the second baffle and the second side opening. The size of the second steel ball is smaller than the inner diameter of the second side opening and the outer pipe of the borehole, but larger than the diameter of the drill rod. A limit block is provided on the inner wall of the front edge of the second side opening.

[0016] Both the first and second springs are designed with short strokes, resulting in fast response speeds.

[0017] A pressure gauge is connected to the front of the outer tube and is used to detect the fluid pressure inside the outer tube.

[0018] The grouting unit is connected to the upper part of the second branch pipe or the front part of the limiting block of the outer pipe;

[0019] The control unit is communicatively connected to the pressure gauge, drill pipe, first propeller, and second propeller.

[0020] First, this application innovatively designs all the opening and closing valves on the side of the outer pipe. Compared with the traditional direct drilling method, the side operation of this application can greatly improve the safety of construction personnel.

[0021] Secondly, based on the design of both the opening and closing valves on the side, a short-stroke spring ball is designed to achieve rapid closure of the borehole. Furthermore, the method of closing the borehole with the steel ball makes full use of the natural impact force of the water flow. Compared with the current method of closing the borehole using a complex structure, this method optimizes the structure and improves the sealing effect.

[0022] After the borehole is closed, grouting can be carried out using the reserved grouting unit, thus achieving the dual purpose of grouting even when high-pressure water is released.

[0023] To facilitate control of the steel ball's movement, both the drainage unit and the water-blocking unit are connected below the outer pipe of the orifice. This ensures the steel ball can only move up and down under the action of the propulsion component.

[0024] The first and / or second propulsion components are threadedly connected to the corresponding branch pipe. Both the first and second propulsion components are controlled by the power unit. There are two levels of sealing in the branch pipe: the first level is the upper baffle seal, and the second level is the lower thread seal. This can prevent underwater movement from affecting the performance of the power unit.

[0025] The portion of the first steel ball that enters the outer borehole tube after blocking the first side opening will not interfere with the drill pipe.

[0026] To prevent the borehole from failing to close after top drilling, the diameter of the second steel ball is designed to be D1, the distance between the second side opening and the lower plane of the drill rod is D2, and the natural extension / retraction of the second spring is D3. Then:

[0027] D1-D2<0.5*(D1+D3).

[0028] When the water pressure is very high, a drill-up phenomenon will occur, forcibly pushing the drill rod out of the borehole. If the first steel ball does not block the borehole immediately, a large amount of water will spray out from the front. Moreover, if the first propulsion component does not activate immediately, the strong water pressure will impact the first branch pipe downwards, creating significant resistance for the first steel ball and affecting its ejection.

[0029] Therefore, this invention also creatively incorporates an emergency avoidance function. When the water pressure is detected to be greater than the warning value, the propulsion component pushes the first steel ball against the drill rod and compresses the first spring. The design of the above formula ensures that when the drill rod is pushed back, the first steel ball, under the action of the first spring, pushes out of the first branch pipe to a height greater than the required obstacle clearance, allowing the first steel ball to smoothly enter the outer pipe of the borehole at the first moment and be blocked at the opening of the sealing part by the water flow.

[0030] The specific structure of the sealing part includes:

[0031] The connecting sleeve has a connecting plate at the front end. The front part of the connecting plate is used to connect with the rear part of the outer tube. An opening is made on the connecting plate for the drill rod to pass through. A sealing ring is provided at the rear of the connecting plate. Threads are provided on both the inner and outer sides of the rear end of the connecting sleeve.

[0032] The clamping component is threaded into the connecting sleeve, with its front end pressing against the elastic sealing ring and its rear end abutting against the rear end of the connecting sleeve.

[0033] The locking element has a threaded connection at the front end to the outside of the connecting sleeve, and a rear end pressed against the rear end of the clamping element.

[0034] An opening is provided in the middle of the sealing ring, clamping element, and locking element for the drill rod to pass through.

[0035] This invention also provides a method for preventing blowouts during underground water exploration and drainage in mines, employing the above-mentioned blowout prevention system, with the following specific steps:

[0036] S1. Install the external pipe, connect the front end of the external pipe to the rear end of the orifice pipe through the flange, and arrange the drainage unit and the water-blocking unit downwards.

[0037] The first steel ball of the drainage unit closes the first side opening under the action of the first propulsion component;

[0038] The second steel ball of the water-blocking unit is located inside the second branch pipe;

[0039] S2, water exploration: extend the drill rod into the external pipe and the borehole pipe until the aquifer is reached;

[0040] S3. Periodically obtain the average value of pressure gauge readings within a time period T;

[0041] If the average value is less than P1 and greater than 0, then proceed to step S4;

[0042] If the average value is greater than or equal to P1, then proceed to step S5;

[0043] S4. Drain water, control the first propulsion component to move down, drive the first steel ball down, so that the drain pipe is connected to the upper space of the first branch pipe, and the water between the outer pipe and the drill rod enters the first branch pipe from the first side opening and then is discharged from the drain pipe.

[0044] S5. Water blocking: The drill rod is withdrawn from the outer tube of the borehole. The second propeller pushes the second steel ball into the outer tube of the borehole. Under the impact of the water flow, the second steel ball pushes against the opening of the sealing part, blocking the connection between the outer tube of the borehole and the sealing part.

[0045] S6. Grouting: Connect the grouting pipe and the grouting unit, and grout into the pipe outside the hole to block the borehole.

[0046] According to the water release progress, step S4 also includes: continuously acquiring pressure gauge data within period T;

[0047] If the pressure gauge reading is 0, it means that the water in the aquifer has been completely released, and the external pipe can be removed from the orifice pipe.

[0048] If the pressure gauge reading remains below P1 but above 0, continue releasing water.

[0049] If the pressure gauge reading is greater than or equal to P1, it indicates that the water flow has increased and there may be water replenishment. In this case, the first propeller is driven to move upward, causing the first steel ball to close the first side opening, stopping the water discharge, and then step S5 is executed.

[0050] In addition, it includes emergency evacuation steps, which are performed simultaneously with step S3, specifically as follows:

[0051] The pressure gauge value is constantly acquired. When the instantaneous pressure gauge value is greater than P2, the second propeller is controlled to move upward, which drives the second steel ball to move upward and press against the drill pipe until the second spring is in the minimum compression state.

[0052] P2 is greater than P1, calculated based on the maximum pressure the drill pipe can withstand. If the pressure gauge reading continues to increase and exceeds P2, there is a high risk that the drill pipe will be pushed out, and water plugging preparations should be made in advance.

[0053] When the on-site construction workers discovered that the drill rod had been forcibly pushed out, they connected the grouting pipe and the grouting unit to inject grout into the pipe outside the hole to block the borehole.

[0054] Through the above design, the mine underground water exploration and drainage anti-blowout system of the present invention firstly creatively designs all the opening and closing valves on the side of the external pipe. Compared with the traditional direct drilling bottom construction method, the side operation of this application can greatly improve the safety of construction personnel.

[0055] Secondly, based on the design of both the opening and closing valves on the side, a short-stroke spring ball is designed to achieve rapid closure of the borehole. Furthermore, the method of closing the borehole with the steel ball makes full use of the natural impact force of the water flow. Compared with the current method of closing the borehole using a complex structure, this method optimizes the structure and improves the sealing effect.

[0056] Furthermore, the designed emergency avoidance control system can effectively solve the problem of not being able to plug the borehole in time after drilling.

[0057] After the borehole is closed, grouting can be carried out using the reserved grouting unit, thus achieving the dual purpose of grouting even when high-pressure water is released. Attached Figure Description

[0058] In the attached diagram:

[0059] Figure 1 This is a schematic diagram of the system's state during water exploration;

[0060] Figure 2 This is a magnified view of a portion of the drainage unit;

[0061] Figure 3 This is a magnified view of a portion of the water-blocking unit;

[0062] Figure 4 This is a schematic diagram illustrating the water release operation.

[0063] Figure 5 This is a schematic diagram illustrating the water blocking operation.

[0064] Figure 6 This is a state diagram illustrating the Y1 step of emergency evacuation;

[0065] Figure 7 This is a state diagram illustrating the Y2 step of emergency evacuation;

[0066] The components represented by the various reference numerals in the diagram are:

[0067] 1. Orifice pipe; 2. External pipe; 21. First side opening; 22. Second side opening; 23. Limiting block; 3. Drainage unit; 31. First branch pipe; 32. Drainage pipe; 33. First propulsion component; 34. First spring; 35. First baffle; 36. First steel ball; 4. Water blocking unit; 41. Second branch pipe; 42. Second propulsion component; 43. Second spring; 44. Second baffle; 45. Second steel ball; 5. Sealing part; 51. Connecting sleeve; 52. Sealing ring; 53. Clamping component; 54. Locking component; 6. Drill rod; 7. Pressure gauge; 8. Grouting unit; 9. Flange. Detailed Implementation

[0068] See Figures 1-3 A blowout prevention system for underground water exploration and drainage in mines, comprising:

[0069] Orifice tube 1 is fixed inside the borehole.

[0070] The outer pipe 2 is a straight pipe, and its front part is connected to the outside of the orifice pipe 1 through the flange 9. The outer wall has a first side opening 21 and a second side opening 22 from front to back, which are used to connect the drainage unit 3 and the water blocking unit 4, respectively.

[0071] The sealing part 5 is connected to the rear of the outer tube 2. It has a through-hole inside to accommodate the drill rod 6. A sealing ring 52 is provided near the end of the outer tube 2 to seal the drill rod 6 after it leaves the outer tube 2, preventing water from flowing out with the drill rod.

[0072] The drill rod 6 is located on one side of the sealing part 5 and can pass through the sealing part 5 and the outer tube 2 to enter the orifice tube 1.

[0073] The drainage unit 3 is connected to the first side opening 21 and includes a first branch pipe 31 and a drainage pipe 32. One end of the first branch pipe 31 is connected to the outer pipe 2, and the other end is threadedly connected to the first pusher 33. One end of the drainage pipe 32 is connected to one side of the first branch pipe 31, and the other end is inclined downward.

[0074] The first branch pipe 31 is vertically connected to the first side opening 21 below the front side of the outer pipe 2, and its inner diameter is larger than that of the first side opening 21.

[0075] The first pusher 33 is connected to the first spring 34 and the first baffle 35 on the side near the outer tube 2. The size of the first baffle 35 matches the inner diameter of the first branch tube 31, and a sealing element is provided on the outer ring. A first steel ball 36 is placed between the first baffle 35 and the first side opening 21. The size of the first steel ball 36 is larger than the size of the first side opening 21. The first steel ball 36 can block the first side opening 21 under the push of the first pusher 33, thereby preventing grout from entering the first branch tube 31 during grouting.

[0076] In addition, the size of the first steel ball 36 is larger than that of the drain pipe 32 to prevent the first steel ball 36 from falling into the drain pipe 32 during its up-and-down movement. Of course, a first baffle 35 structure can also be designed to lock the first steel ball 36 inside the first baffle 35 to prevent it from rolling into the drain pipe 32.

[0077] To facilitate sealing of the first side opening 21 by the first steel ball 36, the first side opening 21 is designed as a circular opening.

[0078] Furthermore, the size of the first side opening 21 should not be too large, so that the part of the first steel ball 36 that enters the outer tube 2 after blocking the first side opening 21 will not interfere with the drill rod 6.

[0079] The water-blocking unit 4 is connected to the second side opening 22 and includes a second branch pipe 41. One end of the second branch pipe 41 is connected to the outer pipe 2 of the hole, and the other end is threadedly connected to the second pusher 42.

[0080] Similar to the first branch pipe 31, the second branch pipe 41 is also vertically connected to the outer pipe 2 and located behind the first branch pipe 31, and fixed to the second side opening 22.

[0081] The second propulsion member 42 is connected to the second spring 43 and the second baffle 44 on the side near the outer tube 2. The size of the second baffle 44 matches the inner diameter of the second branch tube 41. A sealing element is provided on the outer ring. A second steel ball 45 is placed between the second baffle 44 and the second side opening 22. The size of the second steel ball 45 is smaller than the inner diameter of the second side opening 22 and the outer tube 2, but larger than the diameter of the drill rod 6. A limiting block 23 is provided on the inner wall of the front edge of the second side opening 22 to ensure that after the second steel ball 45 enters the outer tube 2 from the second branch tube 41, it can only roll toward the sealing part 5 under the action of the limiting block 23 and the fluid impact force.

[0082] To facilitate control of the steel ball's movement, both the drainage unit 3 and the water-blocking unit 4 are connected below the outer pipe 2. This ensures the steel ball can only move up and down under the action of the propulsion component.

[0083] Both the first spring 34 and the second spring 43 are designed with short strokes, resulting in fast response speeds.

[0084] Pressure gauge 7 is connected to the front of the orifice tube 2 and is used to detect the fluid pressure inside the orifice tube 2. To further improve the detection accuracy, pressure gauge 7 can also be installed on the orifice tube 1 to obtain the fluid pressure at multiple locations, which is convenient for the application of intelligent blowout prevention systems.

[0085] Grouting unit 8 is connected to the upper part of the second branch pipe 41 or the front part of the limiting block 23 of the outer pipe 2. See Figures 5-7The different locations are shown. When encountering high-pressure water, grout can be injected into the hole from the second branch pipe 41 or the outer pipe 2. The grout first contacts the second steel ball 45 and further presses it onto the sealing part 5, and then flows upward to block the outlet.

[0086] The control unit is communicatively connected to the pressure gauge 7, drill pipe 6, first propeller 33, and second propeller 42.

[0087] Through the above design, firstly, this application creatively designs all the opening and closing valves on the side of the outer pipe 2. Compared with the traditional direct drilling bottom construction method, the side operation of this application can greatly improve the safety of construction personnel.

[0088] Secondly, based on the design of both the opening and closing valves on the side, a short-stroke spring ball is designed to achieve rapid closure of the borehole. Furthermore, the method of closing the borehole with the steel ball makes full use of the natural impact force of the water flow. Compared with the current method of closing the borehole using a complex structure, this method optimizes the structure and improves the sealing effect.

[0089] After the borehole is closed, grouting can be carried out using the reserved grouting unit 8, thus achieving the dual-purpose capability of grouting even under high-pressure water exploration and release, making an outstanding contribution to the development of the industry.

[0090] See Figure 2 and Figure 3 Both the first propeller 33 and the second propeller 42 are threadedly connected to their respective branch pipes. Both propellers are controlled by a power unit. Two levels of sealing are provided within the branch pipe: the first level is an upper baffle seal, and the second level is a lower threaded seal. This prevents underwater flow from affecting the performance of the power unit. Especially for the drainage unit, when the first baffle 35 moves to the opening of the drainage pipe 32, it is in the water discharge phase, and the first baffle 35 loses its sealing effect. The underwater flow is prevented entirely by the threaded seal between the first propeller 33 and the first branch pipe 31.

[0091] During normal water plugging operations, the drill rod 6 is first withdrawn, and then the second steel ball 45 is driven upwards to plug the sealing part 5. However, sometimes the water pressure is so high that the drill rod 6 cannot withdraw automatically in time and is quickly pushed out, i.e., the drill is pushed out. At this time, the second steel ball is located inside the second branch pipe 41, and the strong water pressure impacts the first branch pipe 31 downwards, which will give the first steel ball 36 greater resistance and affect its push-out.

[0092] To prevent the borehole from failing to close after top drilling, in this embodiment, the diameter of the second steel ball 45 is designed to be D1, the distance between the second side opening 22 and the lower plane of the drill rod 6 is D2, and the natural extension / retraction of the second spring 43 is D3. Therefore:

[0093] D1-D2<0.5*(D1+D3).

[0094] It also features an innovative emergency avoidance function. When the water pressure exceeds the warning value, the propulsion component pushes the first steel ball 36 against the drill rod 6 and compresses the first spring 34. The design of the above formula ensures that when the drill rod 6 is pushed back, the first steel ball 36 is pushed out of the first branch pipe 31 at a height greater than the required obstacle clearance height under the action of the first spring 34. This allows the first steel ball 36 to smoothly enter the outer pipe 2 at the first moment and be blocked at the opening of the sealing part 5 by the water flow.

[0095] See below. Figure 1 The specific structure of the sealing part 5 is described below, including:

[0096] The connecting sleeve 51 has a connecting plate at the front end. The front part of the connecting plate is used to connect with the rear part of the outer tube 2. An opening is made on the connecting plate for the drill rod 6 to pass through. A sealing ring 52 is provided at the rear of the connecting plate. The inner and outer sides of the rear end of the connecting sleeve 51 are threaded.

[0097] The clamping element 53 is threaded into the connecting sleeve 51. Its front end compresses the elastic sealing ring 52, and its rear end abuts against the rear end of the connecting sleeve 51, thus tightening the sealing ring 52 to resist the impact force of the water flow on the sealing ring 52 and the squeezing force of the second steel ball 45.

[0098] The locking element 54 has its front end threadedly connected to the outside of the connecting sleeve 51, and its rear end pressed against the rear end of the pressing element 53. It is locked together with the connecting sleeve 51 and the pressing element 53 to form an integral structure, thereby improving its impact resistance.

[0099] An opening is provided in the middle of the sealing ring 52, the clamping member 53, and the locking member 54 for the drill rod 6 to pass through. The opening of the sealing ring 52 is slightly smaller, forming an interference fit with the drill rod 6 to prevent water from passing through the sealing ring 52.

[0100] This invention also provides a method for preventing blowouts during underground water exploration and drainage in mines, employing the above-mentioned blowout prevention system, with the following specific steps:

[0101] S1. Install the outer pipe 2, connect the front end of the outer pipe 2 to the rear end of the orifice pipe 1 through the flange 9, and arrange the drainage unit 3 and the water-blocking unit 4 downwards.

[0102] The first steel ball 36 of the drainage unit 3 closes the first side opening 21 under the action of the first pusher 33;

[0103] The second steel ball 45 of the water-blocking unit 4 is located inside the second branch pipe 41;

[0104] S2. Water exploration: Insert drill rod 6 into the external pipe 2 and the orifice pipe 1 until the aquifer is reached.

[0105] S3. Periodically obtain the average value of the pressure gauge 7 readings within the time period T;

[0106] If the average value is less than P1 and greater than 0, then proceed to step S4;

[0107] If the average value is greater than or equal to P1, then proceed to step S5;

[0108] The selection of the P1 value depends on the drill pipe model, as different models of drill pipes can withstand different impact forces from high-pressure water.

[0109] S4. Discharge water. Control the first propeller 33 to move downwards, causing the first steel ball 36 to descend, connecting the drain pipe 32 with the upper space of the first branch pipe 31. Water between the outer borehole pipe 2 and the drill rod 6 enters the first branch pipe 31 through the first side opening 21 and then drains away through the drain pipe 32. (See below) Figure 4 As shown.

[0110] When the aquifer has a low water volume, the water pressure inside the borehole is generally around 1 MPa, so drainage can be safely carried out.

[0111] S5, water blocking: Drill rod 6 exits the outer tube 2, and the second propeller 42 pushes the second steel ball 45 into the outer tube 2. Under the impact of the water flow, the second steel ball 45 presses against the opening of the sealing part 5, blocking the connection between the outer tube 2 and the sealing part 5. (See below) Figure 5 As shown.

[0112] For example, if the average pressure gauge reading is around 5 MPa within 15 minutes, the aquifer is very likely to be replenished with water, and water plugging operations are required.

[0113] S6. Grouting: Connect the grouting pipe and the grouting unit 8, and grout into the outer pipe 2 to block the borehole.

[0114] After grouting is completed, the flange 9 at the connection between the outer pipe 2 and the orifice pipe 1 can be removed, and the device can be reused.

[0115] In addition, according to the water release progress, step S4 also includes: periodically obtaining the average value of the pressure gauge 7 readings within the time period T;

[0116] If the pressure gauge 7 reads 0, it means that the water in the aquifer has been completely released, and the external pipe 2 can be removed from the orifice pipe 1.

[0117] If the pressure gauge 7 reading remains below P1 but above 0, continue releasing water.

[0118] If the pressure gauge 7 reading is greater than or equal to P1, it indicates that the water flow has increased and there may be water replenishment. In this case, the first propeller 33 is driven to move upward, causing the first steel ball 36 to close the first side opening 21, stopping the water discharge, and then step S5 is executed.

[0119] In addition, it includes emergency evacuation steps, which are performed simultaneously with step S3, specifically as follows:

[0120] The pressure gauge 7 value is constantly acquired. When the instantaneous value of the pressure gauge 7 is greater than P2, the second pusher 42 is controlled to move upward, which drives the second steel ball 45 to move upward and press against the drill rod 6 until the second spring 43 is in the minimum compression state.

[0121] P2 is greater than P1, calculated based on the maximum pressure that drill rod 6 can withstand. If the reading on pressure gauge 7 continues to increase and exceeds P2, there is a high risk that drill rod 6 will be pushed out, and water plugging preparations must be made in advance. Since the second steel ball 45 is pressed against drill rod 6 under the elastic force of spring 43, once drill rod 6 is pushed out, the second steel ball 45 will immediately enter the outer tube 2 under the elastic force and be impacted by the water flow, pressing against the sealing part, thereby quickly plugging the water.

[0122] When the on-site construction personnel discovered that the drill rod 6 had been forcibly pushed out, they connected the grouting pipe and the grouting unit 8 and injected grout into the outer pipe 2 of the hole to block the borehole.

Claims

1. A mine underground water exploration and drainage blowout prevention system, characterized in that, include: The orifice pipe (1) is fixed inside the borehole opening; The outer tube (2) is connected to the outside of the orifice tube (1) at the front, and the outer wall is provided with a first side opening (21) and a second side opening (22) from front to back. The sealing part (5) is connected to the rear of the outer tube (2), and has a through-hole for the drill rod (6) to pass through. A sealing ring (52) is provided at one end near the outer tube (2). The drill rod (6) is located on one side of the sealing part (5) and can pass through the sealing part (5) and the outer tube (2) to enter the orifice tube (1); The drainage unit (3) is connected to the first side opening (21) and includes a first branch pipe (31) and a drain pipe (32). One end of the first branch pipe (31) is connected to the outer pipe (2) and the other end is connected to the first pusher (33). One end of the drain pipe (32) is connected to one side of the first branch pipe (31) and the other end is inclined downward. The first pusher (33) is connected to a first spring (34) and a first baffle (35) on the side near the outer tube (2). The size of the first baffle (35) matches the inner diameter of the first branch tube (31). A sealing element is provided on the outer ring. A first steel ball (36) is placed between the first baffle (35) and the first side opening (21). The size of the first steel ball (36) is larger than the size of the first side opening (21) and the size of the drain pipe (32). The first steel ball (36) can block the first side opening (21) under the push of the first pusher (33). The water-blocking unit (4) is connected to the second side opening (22) and includes a second branch pipe (41). One end of the second branch pipe (41) is connected to the outer pipe (2), and the other end is connected to a second pusher (42). The second pusher (42) is connected to a second spring (43) and a second baffle (44) on the side near the outer pipe (2). The size of the second baffle (44) matches the inner diameter of the second branch pipe (41), and a sealing element is provided on the outer ring. A second steel ball (45) is placed between the second baffle (44) and the second side opening (22). The size of the second steel ball (45) is smaller than the inner diameter of the second side opening (22) and the outer pipe (2), and larger than the diameter of the drill rod (6). A limit block (23) is provided on the inner wall of the front edge of the second side opening (22) to ensure that after the second steel ball (45) enters the outer pipe (2) from the second branch pipe (41), it can only roll toward the sealing part (5) under the action of the limit block (23) and the fluid impact force. Pressure gauge (7) is connected to the front of the outer tube (2) and is used to detect the fluid pressure inside the outer tube (2); Grouting unit (8) is connected to the upper part of the second branch pipe (41) or the front part of the limiting block (23) of the outer pipe (2); The control unit is communicatively connected to the pressure gauge (7), drill pipe (6), first propeller (33), and second propeller (42).

2. The mine underground water exploration and drainage blowout prevention system according to claim 1, characterized in that, Both the drainage unit (3) and the water-blocking unit (4) are connected below the outer pipe (2).

3. The mine underground water exploration and drainage blowout prevention system according to claim 1, characterized in that, The first propulsion member (33) and / or the second propulsion member (42) are threadedly connected to the corresponding branch pipe.

4. A mine underground water exploration and drainage blowout prevention system according to claim 1, characterized in that, The portion of the first steel ball (36) that enters the outer tube (2) after blocking the first side opening (21) will not interfere with the drill rod (6).

5. A mine underground water exploration and drainage blowout prevention system according to claim 1, characterized in that, The first spring (34) and the second spring (43) are short-stroke springs.

6. A mine underground water exploration and drainage blowout prevention system according to claim 5, characterized in that, The diameter of the second steel ball (45) is D1, the distance between the second side opening (22) and the lower plane of the drill rod (6) is D2, and the natural extension / retraction of the second spring (43) is D3. Then: D1-D2<0.5 (D1+D3) 7. A mine underground water exploration and drainage blowout prevention system according to any one of claims 1-6, characterized in that, The sealing part (5) includes: The connecting sleeve (51) has a connecting plate at the front end. The front part of the connecting plate is used to connect with the rear part of the outer tube (2). The connecting plate has an opening for the drill rod (6) to pass through. The rear part of the connecting plate is provided with a sealing ring (52). The inner and outer sides of the rear end of the connecting sleeve (51) are provided with threads. The clamping part (53) is threaded into the connecting sleeve (51), with its front end pressing against the sealing ring (52) and its rear end abutting against the rear end of the connecting sleeve (51); The locking element (54) has its front end threadedly connected to the outside of the connecting sleeve (51), and its rear end pressed against the rear end of the clamping element (53); The sealing ring (52), the clamping member (53) and the locking member (54) all have openings in the middle for the drill rod (6) to pass through.

8. A method for preventing blowouts during underground water exploration and drainage in mines, characterized in that, The specific steps of using the mine underground water exploration and drainage blowout prevention system according to any one of claims 1-7 are as follows: S1. Install the outer pipe (2), connect the front end of the outer pipe (2) to the rear end of the orifice pipe (1) through the flange (9), and arrange the drainage unit (3) and the water-blocking unit (4) downwards; The first steel ball (36) of the drainage unit (3) closes the first side opening (21) under the action of the first propulsion member (33); The second steel ball (45) of the water-blocking unit (4) is located inside the second branch pipe (41); S2, water exploration: insert the drill rod (6) into the borehole pipe (2) and the borehole pipe (1) until the aquifer is reached; S3. Periodically obtain the average value of the pressure gauge (7) readings within the time period T; If the average value is less than P1 and greater than 0, then proceed to step S4; If the average value is greater than or equal to P1, then proceed to step S5; S4. Discharge water, control the first propulsion component (33) to move down, drive the first steel ball (36) down, so that the drain pipe (32) is connected to the upper space of the first branch pipe (31); S5, water blocking, the drill rod (6) exits the outer tube (2), the second propeller (42) pushes the second steel ball (45) into the outer tube (2), the second steel ball (45) is pushed against the opening of the sealing part (5) under the action of water flow impact force, blocking the connection between the outer tube (2) and the sealing part (5); S6. Grouting: Connect the grouting pipe and the grouting unit (8) to grout into the outer pipe (2) of the hole to block the borehole.

9. A method for preventing blowouts in underground mine water exploration and drainage according to claim 8, characterized in that, Step S4 also includes: continuously acquiring pressure gauge (7) data within period T; If the pressure gauge (7) reads 0, remove the outer tube (2) from the orifice tube (1); If the pressure gauge (7) value is greater than or equal to P1, the first pusher (33) is driven to move upward, so that the first steel ball (36) closes the first side opening (21), and then step S5 is executed.

10. A method for preventing blowouts in underground mine water exploration and drainage according to claim 8, characterized in that, It also includes emergency evacuation steps: When the instantaneous value of the pressure gauge (7) is greater than P2, the second propeller (42) is controlled to move upward, which drives the second steel ball (45) to move upward and press against the drill rod (6) until the second spring (43) is in the minimum compression state; Among them, P2 is greater than P1.

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