Bag type gas extraction hole packer

Abstract

The utility model discloses a bag type gas extraction hole packer in the technical field of hole packers.The bag type gas extraction hole packer comprises at least two hole sealing bags and further comprises a gas pipe, a grouting pipe and a slurry return pipe, the adjacent hole sealing bags expand to form a closed space, and the grouting pipe is provided with an explosion valve located in the closed space; the slurry return pipe extends into the closed space, a certain gap is formed between the slurry return pipe and the adjacent hole sealing bag, the height of the explosion valve is always lower than the height of a pipe opening, located in the closed space, of the slurry return pipe according to the drilling direction, and the pipe opening is upwards away from the explosion valve. The technical problems that in the prior art, an explosion valve sprays slurry towards the pipe opening of the slurry return pipe, the slurry return pipe is blocked by slurry before exhausting, and exhausting cannot be conducted are solved, and therefore the filling effect and the sealing effect of hole sealing slurry are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hole sealers, in particular to a bag-type gas extraction hole sealer. Background Art

[0002] Drilling and gas extraction is the main technical means for coal mine gas disaster prevention and control, coalbed methane development and utilization. In coal mine gas extraction work, drilling sealing technology has always been a difficult problem restricting gas extraction. Currently, commonly used drilling sealing technologies include cement mortar sealing, polyurethane foam sealing, gas extraction plugger sealing, and pressurized expansion capsule sealing.

[0003] Referring to the prior art CN104343415A-gas extraction drilling hole injection expansion bag sealer, it includes two sealing bags for sealing coal seam drilling holes and gas extraction pipes, grouting pipes, and return grouting pipes passing through the inner cavity thereof, the sealing bags are arranged at intervals at both ends of the grouting pipes, and at least one closed space is formed in the coal seam drilling hole, the grouting pipes are provided with one-way bursting valves A on the passages in the sealing bags, and one-way bursting valves B are provided on the passages in the closed space, and the bursting pressure of the one-way bursting valve A is less than the bursting pressure of the one-way bursting valve B. The present invention provides sealing bags and bursting valves, and successively injects sealing slurry into the sealing bags and the sealed space between the sealing bags, and the sealing bags expand rapidly, and finally the bags and the hole wall and the slurry in the sealed space are tightly combined. However, in actual applications, it is found that due to the presence of air in the confined space, when the slurry fills the confined space, the air cannot be discharged, and the air forms a large number of bubbles in the slurry to form gaps, which affects the filling effect of the sealing slurry and also affects the sealing performance.

[0004] For this purpose, referring to the prior art mining hole sealer-CN205858268U, a bursting valve is also used to inject grout into the enclosed space, and a return grout pipe is used to exhaust the air in the enclosed space. However, the direction of drilling holes is divided into upward holes (drilled holes inclined upward toward the vertical plane) and downward holes (drilled holes inclined downward toward the vertical plane). The prior art does not specifically restrict the position of the return grout pipe and the bursting valve in combination with the actual application scenario. For example, when the downward hole is sealed, if the bursting valve is located above the return grout pipe orifice, the bursting valve is sprayed toward the return grout pipe orifice, and the return grout pipe is blocked by slurry before exhaust, so it cannot be exhausted, which will affect the filling effect and sealing effect of the sealing slurry. Utility Model Content

[0005] The utility model aims to provide a bag-type gas extraction hole sealer to solve the problem in the prior art that the bursting valve sprays toward the return slurry pipe orifice, causing the return slurry pipe to be blocked and unable to be vented.

[0006] In order to solve the above problems, the utility model provides the following technical solutions:

[0007] A bag-type gas extraction hole sealer includes at least two hole-sealing bags, a gas pipe, a grouting pipe and a return grouting pipe. Adjacent hole-sealing bags expand to form a closed space. The grouting pipe is provided with a bursting valve located in the closed space. The return grouting pipe extends into the closed space and has a certain gap with the adjacent hole-sealing bags. According to the direction of the borehole, the height of the bursting valve is always lower than the height of the pipe mouth of the return grouting pipe in the closed space, and the pipe mouth is upward away from the bursting valve.

[0008] The working principle and beneficial effects of the utility model:

[0009] When using this solution, the sealer is inserted into the drill hole of the coal seam, and pressurized grouting is performed through the grouting pipe. After grouting, the sealing bag expands and seals the drill hole, forming a closed space between adjacent sealing bags. Subsequently, the bursting valve is opened under the action of the grouting pressure, and the slurry is poured into the closed space.

[0010] The positions of the return grouting pipe and the bursting valve are arranged according to the direction of the borehole. For example, when the downward hole needs to be closed, the height of the bursting valve is lower than the height of the pipe mouth of the return grouting pipe in the confined space, and the pipe mouth is upward and away from the bursting valve. In this case, the bursting valve will not spray grout toward the return grouting pipe during grouting. The slurry is grouted from bottom to top in the confined space, squeezing the air in the confined space toward the direction of the return grouting pipe, and the air in the confined space is discharged outward through the return grouting pipe; and, when the return grouting pipe is filled with slurry, it means that the confined space has been filled with slurry. After the closure and exhaust are completed, the gas is extracted through the gas pipe.

[0011] According to the scheme, the height of the bursting valve is always lower than the height of the pipe mouth of the return slurry pipe in the confined space according to the direction of the drilling, and the pipe mouth is upward and away from the bursting valve, thereby solving the problem of the prior art that the bursting valve is sprayed toward the pipe mouth of the return slurry pipe, and the return slurry pipe is blocked by slurry before it is exhausted and cannot be exhausted, thereby improving the filling effect and sealing effect of the sealing slurry.

[0012] Optimally, the number of the hole-sealing bags is 2. Using 2 hole-sealing bags can achieve a better blocking effect.

[0013] Optimally, the hole sealing bag is specifically a rubber hole sealing bag or a cloth bag hole sealing bag. The rubber hole sealing bag is elastic and easy to deform, and the rubber hole sealing bag can better seal the drill hole after grouting; the cloth bag hole sealing bag is light and easy to carry.

[0014] Optimally, sleeves are fixedly sleeved at both ends of each hole sealing bag, and the gas pipe, grouting pipe and return grouting pipe pass through the sleeves. This arrangement makes it convenient to place the hole sealing bag in the coal seam borehole.

[0015] Optimally, the discharge direction of the burst valve is away from the orifice of the return slurry pipe. This arrangement allows the air squeezed upward by the slurry to be quickly discharged outward through the return slurry pipe, thereby increasing the exhaust speed.

[0016] Optimally, one end of the return slurry pipe located in the enclosed space is provided with a plurality of exhaust holes, which play a role of auxiliary exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a bag-type gas extraction hole sealer of the utility model when it is applied to an upward hole;

[0018] Figure 2 This is a schematic diagram of the structure of a bag-type gas extraction hole sealer of the utility model when it is applied to a downhole;

[0019] Figure 3 for Figure 1 Schematic diagram of the internal mechanism located at the sealing bag. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The reference numerals in the drawings of the specification include: bursting valve 1, sealing bag 2, sleeve 3, grouting pipe 4, gas pipe 5, return grout pipe 6, exhaust hole 7.

[0022] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions shown in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0023] Embodiment: A bag-type gas extraction sealer, such as Figure 3 As shown, two sealing bags 2 are included, and sleeves 3 are fixedly sleeved at both ends of each sealing bag 2 to achieve sealing of both ends of the rubber sealing bag 2. The sealing bag 2 is specifically a rubber sealing bag 2 or a cloth bag sealing bag 2. This embodiment uses a cloth bag sealing bag 2, which is light in weight and easy to carry and arrange.

[0024] like Figure 3 As shown, it also includes a gas pipe 5, a grouting pipe 4 and a return grouting pipe 6 fixedly connected to the sleeve 3. The gas pipe 5 extends downward from the inside of the two sealing bags 2 to the bottom of the borehole, the grouting pipe 4 extends into the inside of the two sealing bags 2, and the return grouting pipe 6 extends to the closed space between the two sealing bags 2. Figure 1 and Figure 2For example, the direction of drilling is divided into upward holes (drilling holes inclined upward toward the vertical plane) and downward holes (drilling holes inclined downward toward the vertical plane). According to the direction of drilling, the height of the position of the bursting valve 1 is always lower than the height of the pipe mouth of the return slurry pipe 6 in the enclosed space, and the pipe mouth is upward away from the bursting valve 1.

[0025] When using this solution, the sealer is inserted into the borehole of the coal seam, and pressurized grouting is performed through the grouting pipe 4. After grouting, the sealing bag 2 expands and seals the borehole, and a closed space is formed between adjacent sealing bags 2. Then, the bursting valve 1 opens under the action of the grouting pressure, and the slurry is poured into the closed space. How the grouting pipe 4 grouts the sealing bag 2 is specifically referred to the prior art CN104343415A-Gas Extraction Borehole Injection and Expansion Bag Sealer

[0026] Arrange the positions of the return pipe 6 and the bursting valve 1 according to the direction of the borehole, refer to Figure 2 For example, when the downward hole needs to be closed, the height of the bursting valve 1 is lower than the height of the mouth of the return slurry pipe 6 in the confined space, and the mouth of the pipe is upwardly away from the bursting valve 1. Then, the bursting valve 1 will not spray slurry directly toward the return slurry pipe 6 during grouting. The slurry is filled from bottom to top in the confined space, squeezing the air in the confined space toward the return slurry pipe 6. The slurry pushes the air in the confined space to be discharged outward through the return slurry pipe 6; and, when the return slurry pipe 6 is filled with slurry, it means that the confined space has been filled with slurry. After the closure and exhaust are completed, the gas is extracted through the gas pipe 5.

[0027] According to the drilling direction, the height of the bursting valve 1 in this solution is always lower than the height of the pipe mouth of the return pipe 6 in the enclosed space, and the pipe mouth is upward and away from the bursting valve 1, thereby solving the problem in the prior art that the bursting valve 1 is sprayed toward the pipe mouth of the return pipe 6, and the return pipe 6 is blocked by slurry before it is exhausted and cannot be exhausted, thereby improving the filling effect and sealing effect of the sealing slurry.

[0028] Optimally, the return slurry pipe 6 is provided with a plurality of exhaust holes 7 at one end of the closed space. The plurality of exhaust holes 7 play a role of auxiliary exhaust.

[0029] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

Claims

1. A bag-type gas extraction sealer, comprising at least two sealing bags, a gas pipe, a grouting pipe and a return grouting pipe, wherein adjacent sealing bags are expanded to form a closed space, the grouting pipe is provided with a bursting valve located in the closed space, the return grouting pipe extends into the closed space and has a certain gap with adjacent sealing bags, characterized in that: According to the direction of the borehole, the height of the bursting valve is always lower than the height of the pipe opening of the return slurry pipe in the closed space, and the pipe opening is upwardly away from the bursting valve.

2. The bag-type gas extraction sealer according to claim 1, characterized in that: The number of the sealing bags is 2.

3. A bag-type gas extraction sealer according to claim 2, characterized in that: The sealing bag is specifically a rubber sealing bag or a cloth bag sealing bag.

4. The bag-type gas extraction sealing device according to claim 3, characterized in that: The two ends of each sealing bag are respectively fixedly sleeved with sleeves, and the gas pipe, grouting pipe and return grouting pipe pass through the sleeves.

5. A bag-type gas extraction sealing device according to any one of claims 1 to 4, characterized in that: The discharge direction of the bursting valve is away from the pipe opening of the return slurry pipe.

6. A bag-type gas extraction sealer according to claim 5, characterized in that: The end of the return slurry pipe located in the closed space is provided with a plurality of exhaust holes.

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