Rapid plugging device and method for in-well water burst dewatering well

Abstract

The invention relates to a quick plugging device and method for an in-well water burst dewatering well. The device comprises a grouting pipe (1), a bag (2), a grouting device (3) and a one-way flowing piece (4). The grouting pipe (1) comprises a grouting outer pipe (11) and a grouting inner pipe (12), the grouting outer pipe (11) is connected with the bag (2), a one-way flowing part (4) is arranged at the joint of the grouting outer pipe (11) and the bag (2), the grouting inner pipe (12) is connected with the grouting device (3), the grouting pipe (1) extends into a well pipe of a dewatering well (5), and the position of the bag (2) is higher than that of the grouting device (3). Compared with the prior art, the rapid plugging device for the dewatering well is provided when water bursts in the well and under the flowing water condition, cement grout can be prevented from being washed away by water flow when water bursts in the well and under the flowing water condition, and the dewatering well is effectively plugged.

Description

Technical Field

[0001] The invention relates to the technical field of sealing a dewatering well, and in particular to a rapid sealing device and method for a dewatering well with water gushing out of the well. Background Art

[0002] The water volume of the pressurized water well is large and the water flow rate is fast. The conventional grouting well sealing method requires that the water in the well is basically static. When water gushes in the well, under the condition of dynamic water, the cement slurry is washed away by the water flow in the conventional grouting well sealing method, making it difficult to effectively seal the well. Summary of the invention

[0003] The purpose of the present invention is to provide a rapid plugging device and method for a well with water gushing out and dewatering.

[0004] The object of the present invention can be achieved by the following technical scheme: a rapid plugging device for a well with water inrush and dewatering, comprising a grouting pipe, a bladder bag, a grouting device and a one-way flow member;

[0005] The grouting pipe comprises an outer grouting pipe and an inner grouting pipe. The outer grouting pipe is connected to a bag. A one-way flow piece is provided at the connection between the outer grouting pipe and the bag. The inner grouting pipe is connected to a grouting device. The grouting pipe extends into the well pipe of the dewatering well. The bag is located higher than the grouting device.

[0006] Preferably, the bag is annularly sleeved on the outside of the grouting inner tube.

[0007] Preferably, a filter is provided in the precipitation well, and the grouting device is placed within the filter range.

[0008] Preferably, the outer grouting pipe is sleeved on the outside of the inner grouting pipe, and a gap is left between the two for slurry or gas to pass through.

[0009] Preferably, the diameter of the bag after expansion is not less than the diameter of the well pipe of the drainage well.

[0010] Preferably, the grouting device comprises a hollow cylindrical body and slurry outlet holes provided on the body, the slurry outlet holes are arranged in a plum blossom shape, the top end of the body is connected to the grouting inner tube, and the bottom end is sealed.

[0011] Preferably, the grouting pipe is connected to a grouting pump.

[0012] Further preferably, the grouting outer tube is sleeved on the grouting outlet of the grouting pump, and the grouting inner tube is connected to the grouting outer tube through a hollow connector.

[0013] Preferably, a switch valve is provided on the grouting inner tube.

[0014] Preferably, the one-way flow member is a check valve, which is arranged in the annular gap between the inner and outer pipes of the grouting pipe.

[0015] A method for quickly plugging a well with water inrush and dewatering, comprising the following steps:

[0016] S1: Place the grouting pipe in the well pipe of the precipitation well, and the position of the bag is higher than the grouting device;

[0017] S2: Gas or cement slurry enters the bag through the grouting outer pipe and the one-way flow piece, thereby causing the bag to expand. The expanded bag blocks the well pipe of the precipitation well, blocking the water inflow in the precipitation well and forming a static water condition;

[0018] S3: Inject cement slurry into the well pipe of the precipitation well through the grouting inner pipe and the grouting device.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention provides a rapid plugging device for a precipitation well under dynamic water conditions when water is gushing in the well, which can prevent cement slurry from being washed away by water flow under dynamic water conditions when water is gushing in the well, thereby effectively plugging the precipitation well;

[0021] 2. The present invention adopts the coordinated arrangement of the inner and outer tubes of the grouting pipe, the bag and the grouting device, and uses the grouting outer tube to expand the bag to block the water gushing in the precipitation well, forming a static water condition, and then injects cement slurry into the well through the grouting inner tube and the grouting device to prevent the cement slurry from flowing out of the precipitation well, thereby realizing the rapid plugging of the precipitation well;

[0022] 3. The present invention is applicable to precipitation wells of various materials and pipe diameters, and the size of the bag can be adjusted according to the pipe diameter of the precipitation well;

[0023] 4. The gas or cement slurry injected into the bag of the present invention can be selected according to the water inflow and water pressure of the precipitation well. The cement slurry injected into the bag is more suitable for the case where the water inflow and water pressure in the precipitation well are large. When the gas is injected into the bag, the gas in the bag can be discharged and the bag can be recovered after the precipitation well is blocked;

[0024] 5. The present invention has reasonable design, simple structure, convenient installation, and mechanical equipment are all placed outside the well. It can quickly and effectively seal the well when water gushes out of the well, getting rid of the limitation that traditional well sealing must be in a basically static water state, and has stronger applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the implementation process diagram of the device of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the device of the present invention;

[0027] Figure 3 It is a schematic diagram of the local structure of Example 3;

[0028] In the figure: 1-grouting pipe, 11-grouting outer pipe, 12-grouting inner pipe, 2-bladder bag, 3-grouting device, 4-one-way flow part, 5-drainage well, 51-well pipe, 6-filter, 7-grouting pump, 71-slurry outlet, 8-switch valve, 9-hollow connecting piece. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example 1

[0031] A quick plugging device for a well with water inrush and dewatering, such as Figures 1-2 As shown, it includes a grouting pipe 1, a bladder bag 2, a grouting device 3 and a one-way flow member 4.

[0032] The grouting pipe 1 includes an outer grouting pipe 11 and an inner grouting pipe 12. The lower end of the outer grouting pipe 11 is connected to the bag 2, and the inner grouting pipe 12 is connected to the grouting device 3. The grouting pipe 1 extends into the well pipe of the dewatering well 5, and the bag 2 is located higher than the grouting device 3. In addition, a one-way flow member 4 is provided at the connection between the outer grouting pipe 11 and the bag 2 to prevent the gas or cement slurry in the bag from flowing back.

[0033] When the device of this embodiment is used to quickly seal a dewatering well with water gushing out of it, gas or cement slurry enters the bag 2 through the grouting outer tube 11, thereby causing the bag 2 to expand. The expanded bag 2 will block the well pipe of the dewatering well 5, blocking the water gushing out of the dewatering well and forming a static water condition. The one-way flow member 4 can prevent the gas or cement slurry in the bag 2 from flowing back, maintaining the expanded state of the bag 2, and then injecting cement slurry into the well through the grouting inner tube 12 and the grouting device 3. The cement slurry is blocked by the bag 2 and will not flow out of the dewatering well 5. After the cement slurry solidifies, the rapid sealing of the dewatering well 5 is achieved.

[0034] Example 2

[0035] A rapid plugging device for a water gushing and dewatering well comprises a grouting pipe 1, a bag 2, a grouting device 3 and a one-way flow member 4.

[0036] The grouting pipe 1 includes an outer grouting pipe 11 and an inner grouting pipe 12. The lower end of the outer grouting pipe 11 is connected to the bag 2, and the inner grouting pipe 12 is connected to the grouting device 3. The grouting pipe 1 extends into the well pipe of the dewatering well 5, and the bag 2 is located higher than the grouting device 3. In addition, a one-way flow member 4 is provided at the connection between the outer grouting pipe 11 and the bag 2 to prevent the gas or cement slurry in the bag from flowing back.

[0037] When using the device of this embodiment to quickly plug the well with water gushing in the well, first plug the grouting inner tube 12 with a plug, connect the gas or cement slurry conveying part (such as a grouting pump) to the grouting outer tube 11, and the gas or cement slurry enters the bag 2 through the grouting outer tube 11, thereby expanding the bag 2. The expanded bag 2 will block the well pipe of the well 5, blocking the water gushing in the well, forming a static water condition, and the one-way flow part 4 can prevent the gas or cement slurry in the bag 2 from flowing back, and keep the bag 2 in an expanded state. Then remove the plug on the grouting inner tube 12, connect the grouting inner tube 12 with the grouting pump, and inject cement slurry into the well through the grouting inner tube 12 and the grouting device 3. The cement slurry will not flow out of the well 5 due to the obstruction of the bag 2. After the cement slurry solidifies, the rapid plugging of the well 5 is achieved.

[0038] Example 3

[0039] A quick plugging device for a well with water inrush and dewatering, such as Figure 3 As shown, the grouting outer tube 11 is sleeved on the grouting outlet 71 of the grouting pump 7, and the grouting inner tube 12 is arranged inside the grouting outer tube 11, with a gap for the slurry to pass through the grouting outer tube 11, and the grouting inner tube 12 is connected to the grouting outer tube 11 through a hollow connector 9, which does not affect the circulation of the slurry. A switch valve 8 is provided on the grouting inner tube 12.

[0040] When the device of this embodiment is used to quickly seal a dewatering well with water gushing out of the well, the switch valve 8 is first in a closed state, and the grouting pump 7 injects cement slurry into the bag 2 through the grouting outer tube 11, thereby causing the bag 2 to expand. The expanded bag 2 will block the well pipe of the dewatering well 5, blocking the water gushing out of the dewatering well and forming a static water condition. The one-way flow member 4 can prevent the gas or cement slurry in the bag 2 from flowing back, maintaining the expanded state of the bag 2, and then open the switch valve 8, and inject cement slurry into the well through the grouting inner tube 12 and the grouting device 3. The cement slurry is blocked by the bag 2 and will not flow out of the dewatering well 5. After the cement slurry solidifies, the rapid sealing of the dewatering well 5 is achieved.

[0041] Example 4

[0042] A rapid plugging device for a water-gushing dewatering well in a well comprises a grouting pipe 1, a bag 2, a check valve (one-way flow member 4, a grouting device 3, a dewatering well 5, a filter 6, a well pipe 51, and a grouting pump 7.

[0043] The upper end of the grouting pipe 1 is connected to the grouting pump 7. The grouting pipe 1 is divided into an inner pipe and an outer pipe. The lower end of the grouting inner pipe 12 is fixedly connected to the grouting device 3, and the lower end of the grouting outer pipe 11 is fixedly connected to the bag 2. A check valve is provided at the connection between the grouting outer pipe 11 and the bag 2. The bag 2 is annularly sleeved on the outside of the grouting inner pipe 12.

[0044] The grouting pipe 1 is placed in the precipitation well pipe 51, the bag 2 is located higher than the precipitation well filter 6, and the grouting device 3 is placed within the range of the precipitation well filter 6. The gas or cement slurry enters the bag 2 through the grouting outer pipe 11, thereby causing the bag 2 to expand. The expanded bag 2 will block the precipitation well pipe 51, blocking the water in the precipitation well and forming a static water condition. The check valve can prevent the gas or cement slurry in the bag 2 from flowing back, maintaining the expansion state of the bag 2, and then injecting cement slurry into the well through the grouting inner pipe 12 and the grouting device 3. The cement slurry is blocked by the bag 2 and will not flow out of the precipitation well 5. After the cement slurry solidifies, the precipitation well 5 is quickly blocked.

[0045] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A rapid plugging device for a well with water inrush and dewatering, characterized in that: It comprises a grouting pipe (1), a bladder bag (2), a grouting device (3) and a one-way flow member (4); The grouting pipe (1) comprises a grouting outer pipe (11) and a grouting inner pipe (12); the grouting outer pipe (11) is connected to a bag (2); a one-way flow member (4) is provided at the connection between the grouting outer pipe (11) and the bag (2); the grouting inner pipe (12) is connected to a grouting device (3); the grouting pipe (1) extends into a well pipe of a drainage well (5); and the bag (2) is located higher than the grouting device (3).

2. The rapid plugging device for a well with water inrush and dewatering according to claim 1 is characterized in that: The bag (2) is annularly sleeved on the outside of the grouting inner tube (12).

3. The rapid plugging device for a well with water inrush and dewatering according to claim 1 is characterized in that: The dewatering well (5) is provided with a filter (6), and the grouting device (3) is placed within the range of the filter (6).

4. The rapid plugging device for a well with water inrush and dewatering according to claim 1, characterized in that: The outer grouting pipe (11) is sleeved on the outer side of the inner grouting pipe (12), and a gap is left between the two for slurry or gas to pass through.

5. The rapid plugging device for a well with water inrush and dewatering according to claim 1, characterized in that: After the bag (2) is expanded to its proper position, its diameter is no less than the diameter of the well pipe of the precipitation well (5).

6. The rapid plugging device for a well with water inrush and dewatering according to claim 1, characterized in that: The grouting device (3) comprises a hollow cylindrical body and a grouting hole provided on the body, the top end of the body is connected to the grouting inner tube (12), and the bottom end is sealed.

7. The rapid plugging device for a well with water inflow and dewatering according to claim 1, characterized in that: The grouting pipe (1) is connected to a grouting pump (7).

8. The rapid plugging device for a well with water inflow and dewatering according to claim 7, characterized in that: The grouting outer tube (11) is sleeved on the grouting outlet of the grouting pump (7), and the grouting inner tube (12) is connected to the grouting outer tube (11) via a hollow connecting piece.

9. The rapid plugging device for a well with water inflow and dewatering according to claim 1, characterized in that: The grouting inner pipe (12) is provided with a switch valve; The one-way flow component (4) is a check valve.

10. A method for quickly plugging a well with water inrush and dewatering, characterized in that: The method is carried out using the device according to any one of claims 1 to 9, comprising the following steps: S1: placing a grouting pipe (1) in a well pipe of a dewatering well (5), with the bag (2) positioned higher than the grouting device (3); S2: gas or cement slurry enters the bag (2) through the grouting outer pipe (11) and the one-way flow member (4), thereby causing the bag (2) to expand. The expanded bag (2) blocks the well pipe of the precipitation well (5), thereby blocking water from gushing out of the precipitation well (5), thereby forming a static water condition; S3: Inject cement slurry into the well pipe of the dewatering well (5) through the grouting inner pipe (12) and the grouting device (3).

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