Three-blocking and two-injecting type bag for sealing gas extraction drill hole

Abstract

The utility model discloses a three-plugging two-injection type bag for sealing a gas extraction drill hole, which is characterized in that when a downward drill hole is plugged, a third hole sealing bag is close to a second hole sealing bag, and an explosion valve on a second grouting pipe is positioned between the third hole sealing bag and a first hole sealing bag; when an ascending drill hole is plugged, the third hole sealing bag is close to the first hole sealing bag, the explosion valve on the second grouting pipe is located between the third hole sealing bag and the second hole sealing bag, the three-plugging two-grouting type bag adopts a three-bag design, the hole sealing position located below is subjected to secondary sealing, a compensation mechanism is formed, and the hole sealing effect is improved. According to the three-blocking two-injection type bag, the probability that slurry leaks from a hole sealing position located below under the action of gravity can be effectively reduced, the reliability and the stability of hole sealing are improved, the three-blocking two-injection type bag obtains a remarkable progress effect through a small amount of structural improvement, compared with an original structure, the increase amount of production cost and use cost is extremely low, and the production efficiency is greatly improved. The method is suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of gas drainage in coal mining, and specifically relates to a three-block-two-injection type bag for sealing gas drainage boreholes. Background Technique

[0002] Mine gas is the general term for various harmful gases mainly composed of methane gushing out from coal and rock during the coal mine production process, and is the main natural factor seriously threatening the safety production of coal mines. The casualties and property losses caused by gas disasters are huge. Therefore, preventing gas disasters is of great significance to the healthy and sustainable development of the coal industry. At present, gas drainage is an important means to control gas in mine operations. During the gas drainage process, it is necessary to ensure that the boreholes are tightly sealed and have a long sealing length to ensure the gas drainage effect.

[0003] Our company previously applied for a utility model patent for a new gas drainage borehole sealing device with the publication number CN218150862U, which combines the grouting pipe of the sealing bag and the grouting pipe in the borehole area between two sealing bags. When grouting through the same pipeline, the sealing bag can be grouted first, and then the borehole area can be grouted, effectively avoiding the sealing failure caused by incorrect grouting sequence. During the actual use process, we found that during the sealing process of upward or downward boreholes, in some cases, due to reasons such as soft or non-smooth borehole walls, the slurry will leak from the lower sealing bag under the action of gravity, resulting in imperfect sealing and affecting the gas drainage efficiency. Therefore, in response to this situation, we specifically optimized the structure and designed a three-block-two-injection type bag for sealing gas drainage boreholes to perform secondary sealing on the lower sealing part, reduce the probability of the slurry leaking from the lower sealing part under the action of gravity, improve the sealing stability and reliability, and ensure the gas drainage effect. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a three-block-two-injection type bag for sealing gas drainage boreholes, which can effectively solve the problems in the background technique.

[0005] To achieve the above object, the present utility model provides the following technical solutions: A three-plug two-injection type bladder for gas drainage borehole sealing, including a drainage pipe and a first sealing bag and a second sealing bag fixedly spaced on the drainage pipe. The first sealing bag and the second sealing bag are connected by a communication pipe, and a blasting valve is arranged on the communication pipe. A first grouting pipe is arranged on the first sealing bag, and a slurry return pipe is penetrated through the first sealing bag. One end of the slurry return pipe is located between the first sealing bag and the second sealing bag, and the other end is provided with a throttle valve. A third sealing bag is arranged between the first sealing bag and the second sealing bag, and a second grouting pipe is arranged on the third sealing bag, and a blasting valve is also arranged on the second grouting pipe; when plugging a downward drilling hole, the third sealing bag is close to the second sealing bag, and the blasting valve on the second grouting pipe is located between the third sealing bag and the first sealing bag; when plugging an upward drilling hole, the third sealing bag is close to the first sealing bag, and the blasting valve on the second grouting pipe is located between the third sealing bag and the second sealing bag.

[0006] As a preferred technical solution of the present utility model, the main body of the blasting valve is a pipe body with a rupture critical pressure lower than that of the communication pipe, and both ends of the blasting valve are connected to the two end parts of the truncated communication pipe through hoop strips.

[0007] As a preferred technical solution of the present utility model, one-way valves are arranged on the first grouting pipe and the second grouting pipe.

[0008] As a preferred technical solution of the present utility model, the first sealing bag, the second sealing bag, and the third sealing bag are all annular and wrap around the drainage pipe when not grouted.

[0009] As a preferred technical solution of the present utility model, the slurry return pipe is bundled on the first grouting pipe.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: This three-plug two-injection type bladder adopts a three-bag design to perform secondary sealing on the sealing part at the lower part, forming a compensation mechanism, which can effectively reduce the probability of slurry leakage from the sealing part at the lower part under the action of gravity, improving the reliability and stability of borehole sealing. This three-plug two-injection type bladder obtains significant improvement effects through a small amount of structural improvement. Compared with the original structure, the increase in production cost and usage cost is extremely low, and it is suitable for large-scale popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the present utility model;

[0012] Figure 2 It is a schematic structural diagram of the present utility model applicable to a downward hole;

[0013] Figure 3 It is a schematic structural diagram of the present utility model applicable to an upward hole;

[0014] Figure 4 Schematic diagram of the use state when plugging the upward hole of the present utility model;

[0015] Figure 5 Schematic diagram of the structure of the blasting valve of the present utility model;

[0016] Figure 6 Schematic diagram of the connection structure between the hole - sealing bag and the gas extraction pipe of the present utility model.

[0017] In the figure: 1 gas extraction pipe, 2 first hole - sealing bag, 3 second hole - sealing bag, 4 connecting pipe, 5 blasting valve, 6 slurry return pipe, 7 first grouting pipe, 8 tightening strip, 9 throttle valve, 10 check valve, 11 second grouting pipe, 12 third hole - sealing bag. Specific implementation mode

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figure 1-6 , the present utility model provides a technical solution: A three - plug - two - injection type bag for sealing gas extraction boreholes, including a gas extraction pipe 1 and a first hole - sealing bag 2 and a second hole - sealing bag 3 fixedly arranged at intervals on the gas extraction pipe 1. The first hole - sealing bag 2 and the second hole - sealing bag 3 are connected through a connecting pipe 4. A blasting valve 5 is arranged on the connecting pipe 4. The main body of the blasting valve 5 has a rupture critical pressure lower than that of the connecting pipe 4. Both ends of the blasting valve 5 are connected to both ends of the truncated connecting pipe 4 through tightening strips 8. When the first hole - sealing bag 2 and the second hole - sealing bag 3 are filled with slurry, continuous grouting will increase the pressure in the connecting pipe 4. When the pressure reaches the critical pressure of the blasting valve 5, the blasting valve 5 ruptures, and the slurry enters the borehole between the first hole - sealing bag 2 and the second hole - sealing bag 3 to seal the borehole;

[0020] A first plugging bag 2 is provided with a first grouting pipe 7. A slurry return pipe 6 is penetrated through the first plugging bag 2. The slurry return pipe 6 is bundled on the first grouting pipe 7, effectively avoiding the entanglement and knotting of the two pipes, improving the usability. One end of the slurry return pipe 6 is located between the first plugging bag 2 and the second plugging bag 3, and the other end is provided with an air throttle valve 9. During grouting, the slurry return pipe 6 is used to discharge the air between the first plugging bag 2 and the second plugging bag 3, improving the smoothness of grouting. When the grout is full and the slurry overflows from the end, at this time, folding and bundling the slurry return pipe 6 can achieve the sealing effect. The air throttle valve 9 can adjust the exhaust speed of the slurry return pipe, cooperate with the external high-pressure grouting power source, achieve the purpose of adjusting the grouting pressure, and facilitate adjusting the grouting pressure according to different borehole wall conditions. When the borehole wall is relatively loose, a smaller grouting pressure can penetrate the plugging material into the rock fissures. When the borehole wall is relatively tight, a larger grouting pressure is required to penetrate the plugging material into the rock fissures. The air throttle valve 9 plays a role in balancing the grouting pressure and the smoothness of grouting;

[0021] A third plugging bag 12 is arranged between the first plugging bag 2 and the second plugging bag 3. The third plugging bag 12 is provided with a second grouting pipe 11, and a blasting valve 5 is also arranged on the second grouting pipe 11;

[0022] One-way valves 10 are arranged on the first grouting pipe 7 and the second grouting pipe 11 to prevent slurry return;

[0023] When plugging a downward drilling hole, as Figure 2 shown, the third plugging bag 12 is close to the second plugging bag 3, and the blasting valve 5 on the second grouting pipe 11 is located between the third plugging bag 12 and the first plugging bag 2. The plugging at the lower part is double-sealed by the third plugging bag 12 and the second plugging bag 3;

[0024] When plugging an upward drilling hole, as Figure 3 、 Figure 4 shown, the third plugging bag 12 is close to the first plugging bag 2, and the blasting valve 5 on the second grouting pipe 11 is located between the third plugging bag 12 and the second plugging bag 3. The plugging at the lower part is double-sealed by the third plugging bag 12 and the first plugging bag 2;

[0025] The first plugging bag 2, the second plugging bag 3, and the third plugging bag 12 are all annular. When not grouting, they are wrapped around the extraction pipe 1. When the slurry enters, the first plugging bag 2, the second plugging bag 3, and the second plugging bag 12 wrapped around the extraction pipe 1 in an annular shape can quickly unfold, and the grouting is smooth, improving the grouting speed.

[0026] In use, an external grouting power source is used to grout through the first grouting pipe 7 and the second grouting pipe 11. During the grouting process, the grouting speed is controlled so that the first hole-sealing bag 2 is filled first, followed by the second hole-sealing bag 3, and finally the third hole-sealing bag 12. After the third hole-sealing bag 12 is grouted, grouting continues synchronously through the first grouting pipe 7 and the second grouting pipe 11, and the blasting valve 5 on the connecting pipe 4 and the second grouting pipe 11 ruptures to grout the drilling area. Among them, whether the third hole-sealing bag 12 is filled can be detected by setting a pressure valve on the second grouting pipe 11. Similarly, whether the first hole-sealing bag 2 and the second hole-sealing bag 3 are filled can be detected by setting a pressure valve on the first grouting pipe 7;

[0027] This three-block two-injection type bladder combines the first grouting pipe 7 of the first hole-sealing bag 2 and the second hole-sealing bag 3 with the first grouting pipe 7 of the drilling area between them into one. When grouting through the same pipeline, the first hole-sealing bag 2, the second hole-sealing bag 3, and the third hole-sealing bag 12 can be grouted first, and then the drilling area can be grouted, effectively avoiding the failure of hole sealing caused by incorrect grouting sequence. At the same time, the exhaust speed of the return grouting pipe 6 can be adjusted, and with the cooperation of an external high-pressure grouting power source, the purpose of adjusting the grouting pressure can be achieved, facilitating the adjustment of the grouting pressure according to different drilling hole wall conditions, so that the hole-sealing material can effectively penetrate into the rock fractures to improve the sealing effect;

[0028] The third hole-sealing bag 12 performs secondary sealing on the lower hole-sealing part, forming a compensation mechanism, which can effectively reduce the probability of slurry leakage from the lower hole-sealing part under the action of gravity, and improve the reliability and stability of hole sealing.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-block two-injection type bladder bag for gas drainage borehole sealing, comprising a drainage pipe (1), a first sealing bag (2) and a second sealing bag (3) fixedly arranged on the drainage pipe (1) at intervals. A connecting pipe (4) is used to connect the first sealing bag (2) and the second sealing bag (3). A blasting valve (5) is arranged on the connecting pipe (4). A first grouting pipe (7) is arranged on the first sealing bag (2). A slurry return pipe (6) is arranged through the first sealing bag (2). One end of the slurry return pipe (6) is located between the first sealing bag (2) and the second sealing bag (3), and the other end is provided with an air throttle valve (9). It is characterized in that: A third sealing bag (12) is arranged between the first sealing bag (2) and the second sealing bag (3). A second grouting pipe (11) is arranged on the third sealing bag (12), and a blasting valve (5) is also arranged on the second grouting pipe (11); When sealing a downward drilling hole, the third sealing bag (12) is close to the second sealing bag (3), and the blasting valve (5) on the second grouting pipe (11) is located between the third sealing bag (12) and the first sealing bag (2); When sealing an upward drilling hole, the third sealing bag (12) is close to the first sealing bag (2), and the blasting valve (5) on the second grouting pipe (11) is located between the third sealing bag (12) and the second sealing bag (3).

2. The three-block two-injection type bladder bag for gas drainage borehole sealing according to claim 1, characterized in that: The main body of the blasting valve (5) is a pipe body with a cracking critical pressure lower than that of the connecting pipe (4). Both ends of the blasting valve (5) are connected to the two end parts of the truncated connecting pipe (4) through hoop strips (8).

3. The three-block two-injection type bladder bag for gas drainage borehole sealing according to claim 1, wherein: Check valves (10) are arranged on the first grouting pipe (7) and the second grouting pipe (11).

4. The three-block two-injection type bladder bag for gas drainage borehole sealing according to claim 1, characterized in that: The first sealing bag (2), the second sealing bag (3) and the third sealing bag (12) are all annular and wrap around the drainage pipe (1) when not grouting.

5. The three-block two-injection type bladder bag for gas drainage borehole sealing according to claim 1, characterized in that: The slurry return pipe (6) is tied to the first grouting pipe (7).

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