Gas extraction drill hole bag hole sealing device

Abstract

The utility model discloses a gas extraction drill hole bag hole sealing device, and particularly relates to the technical field of gas extraction. The gas extraction drilling bag hole sealing device comprises an inner pipe, a plurality of arc-shaped plate assemblies are arranged on the outer ring of the inner pipe, each arc-shaped plate assembly comprises a plurality of arc-shaped plates distributed in the radial direction of the inner pipe, the inner pipe and the arc-shaped plates are integrally formed, and the arc-shaped plates are arranged in the radial direction of the inner pipe. A first containing space is reserved between every two adjacent arc-shaped plates, a second containing space is reserved on the circumference of the inner pipe and between every two adjacent arc-shaped plates, a bag is fixed to the outer ring of the inner pipe, and the bag is composed of a plurality of longitudinal bag structures and a plurality of arc-shaped bag structures. The multiple longitudinal bag structures are located in the corresponding second containing spaces respectively. According to the gas extraction drill hole bag hole sealing device, a firm structure is formed after the bag is filled with cement grout, the wall of a drill hole can be effectively supported, and hole collapse is prevented.

Description

Technical Field

[0001] This utility model relates to the field of gas extraction technology, and in particular to a gas extraction borehole bag sealing device. Background Technology

[0002] There are many methods for gas drainage in mines, one of the most important being drilling boreholes in the coal seam to pre-drain gas from the working face. However, drilling disrupts the original stress distribution of the coal seam. After the drill rod is withdrawn, the stress redistributes, and the borehole wall is stressed. Under mechanical pressure, the coal seam at weak points shifts, deforms, or even collapses, significantly reducing the effective gas drainage area and resulting in less efficient drainage. A traditional solution is to insert metal drainage pipes into the gas drainage boreholes. However, this method has drawbacks. The metal drainage pipes need to be removed during mining, which consumes considerable manpower and resources. Furthermore, the limited space in the coal face transport roadway and track roadway makes it difficult to extract the metal drainage pipes.

[0003] Therefore, it is necessary to provide a gas extraction borehole bag sealing device to solve the above-mentioned technical problems. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a gas extraction borehole bag sealing device. The robust structure formed by filling the bag with cement slurry can effectively support the borehole wall and prevent borehole collapse.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A gas extraction borehole bag sealing device includes: an inner tube, with multiple sets of arc-shaped plate assemblies arranged on the outer circumference of the inner tube. Each arc-shaped plate assembly includes multiple arc-shaped plates distributed radially along the inner tube. The inner tube and the multiple arc-shaped plates are integrally formed. In the radial direction of the inner tube, a first accommodating space is reserved between two adjacent arc-shaped plates. On the circumference of the inner tube, a second accommodating space is reserved between two adjacent arc-shaped plates. A bag is fixed on the outer circumference of the inner tube. The bag consists of multiple longitudinal bag structures and multiple arc-shaped bag structures. The multiple longitudinal bag structures are respectively located in the corresponding second accommodating spaces, and the multiple arc-shaped bag structures are respectively located in the corresponding first accommodating spaces. The bag is fixed to the inner tube. A slurry inlet pipe is provided on one of the longitudinal bag structures. Multiple large suction holes and small suction holes are respectively opened on the arc-shaped plates and the inner tube.

[0007] Preferably, the multiple sets of arc-shaped plate assemblies are arranged in a ring array.

[0008] Preferably, multiple longitudinal capsule structures and multiple arc-shaped capsule structures are integrally formed.

[0009] Preferably, the bag is initially in a vacuum state, and the bag in the vacuum state is tightly attached to the outer wall of the inner tube.

[0010] Preferably, the portion of the slurry inlet pipe located in the bladder extends to near the end of the bladder.

[0011] Preferably, a cavity is provided between the inner ring of the arc-shaped plate and the inner tube, and the cavity is mainly used to accommodate some broken coal slag.

[0012] Preferably, a triangular area is formed between the arc-shaped plate and the pouch.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The robust structure formed by filling the bag with cement slurry can effectively support the borehole wall and prevent the borehole from collapsing. At the same time, the outer arc of the arc plate contacts the borehole wall, providing auxiliary support and further improving the stability of the sealing device, ensuring the safety and continuity of the gas extraction process.

[0015] (2) In this utility model, the bladder in the initial vacuum state is close to the inner tube, which makes it easy for the device to be quickly inserted into the drill hole and reduces the installation difficulty.

[0016] (3) In this utility model, the large suction hole on the arc plate and the small suction hole on the inner tube form a multi-stage gas extraction channel. Combined with the void-avoiding design of the triangular area, the hole wall is prevented from blocking the suction hole, which significantly improves the gas extraction efficiency.

[0017] (4) The cavity of the inner ring of the arc plate of this utility model can accommodate the coal slag flowing with the gas, reducing the risk of coal slag entering the extraction pipe and reducing the probability of system blockage. Attached Figure Description

[0018] Figure 1 A schematic diagram of the gas extraction borehole bag sealing device provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the assembly of the inner tube and the arc-shaped plate;

[0020] Figure 3 A front view schematic diagram of the gas extraction borehole bag sealing device provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the sac structure;

[0022] Figure 5 This is a schematic diagram of the sac structure.

[0023] The corresponding names of the reference numerals in the attached drawings are as follows: 1. Inner tube; 2. Arc-shaped plate; 3. Bag; 4. First receiving space; 5. Second receiving space; 6. Longitudinal bag structure; 7. Arc-shaped bag structure; 8. Slurry inlet pipe; 9. Large suction hole; 10. Small suction hole; 11. Cavity; 12. Triangular area. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0025] Example 1

[0026] like Figure 1-5 As shown, the gas extraction borehole bag sealing device provided by this utility model includes: an inner tube 1, with multiple sets of arc-shaped plate assemblies arranged in a ring array on the outer circumference of the inner tube 1. Each arc-shaped plate assembly includes multiple arc-shaped plates 2 distributed radially along the inner tube 1. The inner tube 1 and the multiple arc-shaped plates 2 are integrally formed. In the radial direction of the inner tube 1, a first receiving space 4 is reserved between two adjacent arc-shaped plates 2. On the circumference of the inner tube 1, a second receiving space 5 is reserved between two adjacent arc-shaped plates 2. A bag 3 is fixed on the outer circumference of the inner tube 1. The bag 3 is composed of multiple longitudinal bag structures 6 and multiple arc-shaped bag structures 7, which are integrally formed. The multiple longitudinal bag structures 6 are respectively located in the corresponding second receiving spaces 5, and the multiple arc-shaped bag structures 7 are... Located in their respective first accommodating spaces 4, the bag 3 and the inner tube 1 are fixed with glue. One of the longitudinal bag structures 6 is provided with a slurry inlet pipe 8. In use, the entire device is inserted into the extraction borehole, with the slurry inlet pipe 8 located outside the extraction borehole. The slurry inlet pipe 8 is connected to a grouting pump, and an appropriate amount of cement slurry is injected into the bag 3 through the grouting pump. After the cement slurry dries, its firmness can play a major role in supporting the borehole wall. At the same time, the outermost point of the arc plate 2 (the furthest point from the circle) contacts the extraction borehole wall and also plays a certain supporting role, but its supporting degree is much smaller than that of the bag after filling with slurry. The arc plate 2 and the inner tube 1 are respectively provided with multiple large suction holes 9 and small suction holes 10. Gas in the coal seam can be extracted through the large suction holes 9 and small suction holes 10.

[0027] Furthermore, the initial state of the bag 3 is a vacuum state, and the bag 3 in the vacuum state is tightly attached to the outer wall of the inner tube 1, thereby making the entire device easier to insert into the extraction borehole.

[0028] Furthermore, the portion of the slurry inlet pipe 8 located in the bag 3 extends to near the end of the bag 3, which allows the cement slurry to flow outward from the borehole, naturally propelling the slurry outward, expelling air, ensuring the bag is fully filled, and enhancing the uniform support for the borehole wall.

[0029] Example 2

[0030] like Figure 3 As shown, a cavity 11 is provided between the inner ring of the arc plate 2 and the inner tube 1. The cavity 11 is mainly used to accommodate some coal slag. Because negative pressure extraction is used in the process of gas extraction, some of the coal slag is light and easily moves with the flowing gas. The cavity 11 can accommodate some of the coal slag, thus preventing more coal slag from entering the gas extraction pipe.

[0031] Example 3

[0032] like Figure 3 As shown, a triangular area 12 is formed between the arc plate 2 and the bag 3. The triangular area 12 is an unsupported area that does not contact the extraction borehole wall, and the large suction hole 9 is set in this location. This ensures normal gas extraction and prevents the extraction borehole wall from directly blocking the large suction hole 9, thus reducing extraction efficiency.

Claims

1. A gas extraction borehole bag sealing device, characterized in that, include: An inner tube (1) is provided with multiple sets of arc-shaped plate (2) assemblies on its outer circumference. The arc-shaped plate (2) assembly includes multiple arc-shaped plates (2) distributed radially along the inner tube (1). The inner tube (1) and the multiple arc-shaped plates (2) are integrally formed. In the radial direction of the inner tube (1), a first accommodating space (4) is reserved between two adjacent arc-shaped plates (2). On the circumference of the inner tube (1), a second accommodating space (5) is reserved between two adjacent arc-shaped plates (2). The outer circumference of the inner tube (1) is fixed. There is a bag (3), which consists of multiple longitudinal bag structures (6) and multiple arc-shaped bag structures (7). The multiple longitudinal bag structures (6) are respectively located in the corresponding second receiving space (5), and the multiple arc-shaped bag structures (7) are respectively located in the corresponding first receiving space (4). The bag (3) is fixed to the inner tube (1). One of the longitudinal bag structures (6) is provided with a slurry inlet pipe (8). The arc plate (2) and the inner tube (1) are respectively provided with multiple large suction holes (9) and small suction holes (10).

2. The gas extraction borehole bag sealing device according to claim 1, characterized in that, Multiple sets of arc-shaped plate (2) components are arranged in a ring array.

3. The gas extraction borehole bag sealing device according to claim 1, characterized in that, Multiple longitudinal capsule structures (6) and multiple arc-shaped capsule structures (7) are integrally formed.

4. A gas extraction borehole bag sealing device according to claim 1, characterized in that, The bag (3) is initially in a vacuum state, and the bag (3) in the vacuum state is tightly attached to the outer wall of the inner tube (1).

5. A gas extraction borehole bag sealing device according to claim 1, characterized in that, The portion of the slurry inlet pipe (8) located in the bladder (3) extends to the vicinity of the end of the bladder (3).

6. A gas extraction borehole bag sealing device according to claim 1, characterized in that, A cavity (11) is provided between the inner ring of the arc plate (2) and the inner tube (1), and the cavity (11) is mainly used to accommodate some coal slag.

7. A gas extraction borehole bag sealing device according to claim 1, characterized in that, A triangular area (12) is formed between the arc-shaped plate (2) and the pouch (3).

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