Spiral hole packer for gas extraction drill hole and using method of spiral hole packer

Abstract

The invention discloses a gas extraction drill hole spiral type hole packer and a using method thereof.The gas extraction drill hole spiral type hole packer comprises an extraction pipe, an inner bag, an outer bag and a one-way pressure relief valve, the inner bag and the outer bag are spirally wound around the extraction pipe, the inner bag and the outer bag are arranged in the axial direction of the extraction pipe in a spaced mode, and the one-way pressure relief valve is arranged between the inner bag and the outer bag; an inner grouting pipe is arranged at the end, close to the outer bag, of the inner bag, an outer grouting pipe and an outer grouting pipe are arranged at the two ends of the outer bag, the outer grouting pipe is close to the inner grouting pipe, and the outer grouting pipe is communicated with the inner grouting pipe through a connecting pipe. And the one-way pressure release valve is arranged on at least one of the outer grouting pipe and the inner grouting pipe. The hole packer is more easily fed into a drill hole, the installation efficiency is improved, the sealing performance of the drill hole is effectively guaranteed, the sealing effect of the hole packer is more reliable, it is effectively guaranteed that grout does not flow back into the bag, the bag is prevented from being burst and losing efficacy, and the use safety and reliability of the hole packer are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of hole sealers, and in particular to a gas extraction drilling spiral hole sealer and a use method thereof. Background Art

[0002] In underground coal mines, drilling for gas extraction is a key measure to prevent and control gas disasters and rationally utilize gas resources. At present, the mainstream gas extraction method is to construct a layer-by-layer borehole in the coal seam (or a layer-through borehole in the rock layer), and then use the "two plugging and one injection" method to seal and extract the borehole. This method involves setting up two plugging structures in the borehole and injecting sealing materials in the middle to fill the borehole space and the cracks in the surrounding rock of the borehole. At the same time, a drainage pipeline is reserved to connect the extraction negative pressure to guide the coal seam gas to be extracted along the extraction pipeline.

[0003] In this context, the integrated bag sealer is favored by the market due to its advantages such as self-adjustable sealing length, stable and non-slip, and simple operation. However, in underground practice, the existing pressure-maintaining sealer is difficult to deliver into the borehole, especially in soft and easily deformed coal seams, to the specified depth. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a gas extraction drilling spiral sealer.

[0006] The spiral sealer for gas extraction drilling holes of the embodiment of the present invention comprises an extraction pipe, an inner bag, an outer bag and a one-way pressure relief valve, wherein the extraction pipe is used to be placed in a borehole to extract gas from a coal seam; each of the inner bag and the outer bag is an elastic bag and is spirally wound on the extraction pipe along the axial direction of the extraction pipe, the inner bag and the outer bag are arranged at intervals along the axial direction of the extraction pipe, an inner grouting pipe is provided at one end of the inner bag adjacent to the outer bag, an outer grouting pipe and an outer grouting pipe are provided at both ends of the outer bag, the outer grouting pipe is arranged adjacent to the inner grouting pipe, and the outer grouting pipe is connected to the inner grouting pipe through a connecting pipe;

[0007] The one-way pressure relief valve is arranged on at least one of the outer grouting pipe and the inner grouting pipe. When the grouting pressure of each of the inner bag and the outer bag exceeds a first preset value, the one-way pressure relief valve opens to discharge grout into the drill hole between the inner bag and the outer bag.

[0008] In some embodiments, each of the outer grouting pipe, the outer grouting pipe and the inner grouting pipe extends along the axial direction of the extraction pipe and is fixed to the extraction pipe by a buckling piece.

[0009] In some embodiments, an inner slurry outlet pipe is provided at one end of the inner bag away from the outer bag, and the inner slurry outlet pipe is fixed to the extraction tube through the buckling piece. A plug is provided at the outlet of the inner slurry outlet pipe, and the plug is detachably connected to the inner slurry outlet pipe.

[0010] In some embodiments, the outlet of the external slurry pipe and the inlet of the internal grouting pipe are provided with quick connectors, and the two ends of the connecting pipe are connected to the external slurry pipe and the internal grouting pipe respectively through the quick connectors.

[0011] In some embodiments, the extraction tube includes an inner tube, a middle tube and an outer tube, the two ends of the middle tube are detachably connected to the inner tube and the outer tube respectively, the inner bag is arranged on the inner tube, and the outer bag is arranged on the outer tube.

[0012] In some embodiments, the radial expansion rate of each of the inner bag and the outer bag is 200% to 250%.

[0013] In some embodiments, the radial expansion strength of each of the inner bladder and the outer bladder is greater than 2.5 MPa.

[0014] In some embodiments, the pressure relief pressure value of the one-way pressure relief valve is 1.0 MPa to 1.5 MPa.

[0015] In some embodiments, the inner pouch and / or the outer pouch are round pouches.

[0016] The method for using the spiral sealer for gas extraction drilling according to the embodiment of the present invention comprises:

[0017] Step 1: Select a hole sealer with appropriate length and diameter according to the diameter of the drilled hole;

[0018] Step 2: According to the sealing parameter requirements, connect the inner bag and the outer bag with a connecting pipe and a pumping pipe of appropriate length to meet the drilling sealing requirements;

[0019] Step 3: Use a grouting pump to perform grouting through the external grouting pipe, and observe the grouting pressure displayed on the grouting pump at the same time, and stop grouting when the grouting pressure of the grouting pump reaches a second preset value;

[0020] Step 4: After the grouting is completed, seal the external grouting pipe, clean the grouting pump, and connect the extraction pipe to the negative pressure pipeline for gas extraction.

[0021] The spiral sealer for gas extraction drilling holes in the embodiment of the present invention reduces the maximum external dimensions of the sealer by spirally winding the inner bag and the outer bag on the extraction pipe, so that the sealer can be more easily inserted into the borehole, especially in soft and easily deformed coal seams, so that it is easier to send it to the specified depth, which greatly improves the installation efficiency. In addition, the spiral bag installation method increases the sealing length between the sealer and the wall of the borehole. When the wall of the borehole is relatively rough and uneven, the longer sealing length can avoid the formation of a slurry leakage channel at the protrusion, effectively ensuring the sealing of the borehole, and making the sealing effect of the sealer more reliable.

[0022] In addition, the one-way pressure relief valve has two functions. First, when the grouting pressure is less than the first preset value, it acts as a one-way channel to allow the grouting slurry to be injected into the two bags through the grouting pipe. Second, when the grouting pressure is greater than the first preset value, it acts as a pressure relief valve, and the slurry is injected into the middle section of the borehole through the one-way pressure relief valve. At the same time, it also prevents the grouting pressure in the middle section of the borehole from being too high, causing the slurry to flow back into the bag and burst the bag, causing the bag to swell and fail, thereby ensuring the safety and reliability of the hole sealer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the use of the hole sealer according to the embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the installation of the outer bag according to an embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the installation of the inner bag according to the embodiment of the present invention.

[0026] Reference numerals:

[0027] 100. Sealer; 200. Borehole; 1. Extraction tube; 101. Inner tube; 102. Middle tube; 103. Outer tube; 2. Inner bladder bag; 3. Outer bladder bag; 4. Inner grouting tube; 5. Outer grouting tube; 6. Outer grouting tube; 7. Connecting tube; 8. One-way pressure relief valve; 9. Pressing piece; 10. Inner grouting tube; 11. Plug; 12. Quick connector. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] like Figures 1 to 3As shown, the spiral sealer 100 for gas extraction drilling of the embodiment of the present invention comprises an extraction pipe 1, an inner bag 2, an outer bag 3 and a one-way pressure relief valve 8. The extraction pipe 1 is used to be placed in the borehole 200 to extract gas from the coal seam. Each of the inner bag 2 and the outer bag 3 is an elastic bag and is spirally wound on the extraction pipe 1 along the axial direction of the extraction pipe 1, and the inner bag 2 and the outer bag 3 are arranged at intervals along the axial direction of the extraction pipe 1. An inner grouting pipe 4 is provided at one end of the inner bag 2 adjacent to the outer bag 3, and an outer grouting pipe 5 and an outer grouting pipe 6 are provided at both ends of the outer bag 3. The outer grouting pipe 6 is arranged adjacent to the inner grouting pipe 4, and the outer grouting pipe 6 is connected to the inner grouting pipe 4 through a connecting pipe 7.

[0030] The one-way pressure relief valve 8 is arranged on at least one of the outer grouting pipe 6 and the inner grouting pipe 4. When the grouting pressure of each of the inner bag 2 and the outer bag 3 exceeds a first preset value, the one-way pressure relief valve 8 opens to discharge grout into the borehole 200 between the inner bag 2 and the outer bag 3.

[0031] When the gas extraction drilling spiral sealer 100 of the embodiment of the present invention is in use, the sealer 100 is placed in the borehole 200, and the inner bag 2 and the outer bag 3 are arranged at intervals in the borehole 200, wherein the inner bag 2 is arranged closer to the bottom of the hole than the outer bag 3.

[0032] After the hole sealer 100 is installed, grouting is performed into the outer bag 3 through the outer grouting pipe 5, and the slurry entering the outer bag 3 flows out through the outer grouting pipe 6. The slurry flowing out of the outer grouting pipe 6 enters the inner grouting pipe 4 through the connecting pipe 7, and the slurry flowing into the inner grouting pipe 4 enters the inner bag 2. The inner bag 2 and the outer bag 3 expand under the grouting pressure, thereby blocking the borehole 200. When the grouting pressure in the inner bag 2 and the outer bag 3 exceeds the first preset value, the one-way pressure relief valve 8 provided on at least one of the outer grouting pipe 6 and the inner grouting pipe 4 opens to discharge grout into the borehole 200 between the inner bag 2 and the outer bag 3, fill the borehole 200 space between the inner bag 2 and the outer bag 3 and the rock gap between the borehole 200 walls, and achieve blocking of the borehole 200.

[0033] The spiral sealer 100 for gas extraction drilling in the embodiment of the present invention reduces the maximum external dimensions of the sealer 100 by spirally winding the inner bag 2 and the outer bag 3 on the extraction pipe 1, so that the sealer 100 is easier to be sent into the borehole 200, especially in soft and easily deformed coal seams, so that it is easier to send it to the specified depth, which greatly improves the installation efficiency. In addition, the spiral bag installation method increases the sealing length between the sealer 100 and the wall of the borehole 200. When the wall of the borehole 200 is relatively rough and uneven, the longer sealing length can avoid the formation of a slurry leakage channel at the protrusion, effectively ensuring the sealing of the borehole 200, and making the sealing effect of the sealer 100 more reliable.

[0034] In addition, the one-way pressure relief valve 8 has two functions. First, when the grouting pressure is less than the first preset value, it plays the role of a one-way channel, allowing the grouting slurry to be injected into the two bags through the grouting pipe; second, when the grouting pressure is greater than the first preset value, it plays a pressure relief role, and the slurry is injected into the middle section of the borehole 200 through the one-way pressure relief valve 8. At the same time, it also prevents the grouting pressure in the middle section of the borehole 200 from being too high, and the slurry flows back into the bag to explode the bag, causing the bag to burst and fail, thereby ensuring the safety and reliability of the use of the hole sealer 100.

[0035] Optionally, the extraction pipe 2 generally adopts a flame retardant antistatic PE pipe, and the compressive strength is determined according to actual needs, generally not less than 3MPa. The diameter of the extraction pipe is generally 32mm to 200mm, and different extraction pipe diameters are selected according to the diameter of the borehole 200.

[0036] In some embodiments, each of the outer grouting pipe 5 , the outer grouting pipe 6 and the inner grouting pipe 4 extends along the axial direction of the extraction pipe 1 and is fixed to the extraction pipe 1 by a buckle 9 .

[0037] like Figures 1 to 3 As shown, the clamping member 9 can be a buckle, a tie or other fixing device, which is used to ensure a firm connection between each of the outer grouting pipe 5, the outer grouting pipe 6 and the inner grouting pipe 4 and the extraction pipe 1, so that they will not slide or shift in the borehole 200 during installation, which helps to improve installation efficiency. In addition, the size of the clamping member 9 does not need to be set larger, which is conducive to reducing the maximum external size of the hole sealer 100.

[0038] In some embodiments, an inner slurry outlet pipe 10 is provided at one end of the inner bag 2 away from the outer bag 3. The inner slurry outlet pipe 10 is fixed to the extraction tube 1 by a buckle 9. A plug 11 is provided at the outlet of the inner slurry outlet pipe 10. The plug 11 is detachably connected to the inner slurry outlet pipe 10.

[0039] like Figure 3 As shown, an inner slurry outlet pipe 10 is provided at one end of the inner bag 2 away from the outer bag 3. On the one hand, by fixing the inner slurry outlet pipe 10, one end of the inner bag 2 can be fixed, making the fixing of the inner bag 2 simple and convenient. On the other hand, when necessary, the plug on the inner slurry outlet pipe 10 can be removed, and the inner slurry outlet pipe 10 can be connected in series with bags at different positions in the same borehole 200, which is conducive to improving the applicability of the hole sealer 100.

[0040] In some embodiments, the outlet of the external slurry pipe 6 and the inlet of the internal grouting pipe 4 are provided with quick connectors 12 , and the two ends of the connecting pipe 7 are connected to the external slurry pipe 6 and the internal grouting pipe 4 through the quick connectors 12 , respectively.

[0041] The provision of the quick connector 12 enables the operator to complete the assembly and disassembly of the hole sealer 100 in a short time, thereby improving work efficiency. It can also be quickly and tightly connected with another section of the grouting pipe to extend the length of the grouting pipe and adapt to drilling holes of different sealing lengths. The quick connector 12 generally has good sealing performance, reduces the risk of slurry leakage at the connection, and ensures the reliability of the plugging.

[0042] In some embodiments, the extraction tube 1 includes an inner tube 101, an intermediate tube 102 and an outer tube 103, the two ends of the intermediate tube 102 are detachably connected to the inner tube 101 and the outer tube 103, respectively, the inner bag 2 is arranged on the inner tube 101, and the outer bag 3 is arranged on the outer tube 103.

[0043] like Figure 1 As shown, the extraction tube 1 is composed of an inner tube 101, an intermediate tube 102 and an outer tube 103, and both ends of the intermediate tube 102 can be detachably connected to the inner tube 101 and the outer tube 103. This structure increases the applicability of the extraction tube 1, and can adapt to boreholes 200 of different depths by changing the length of the intermediate tube 102.

[0044] Optionally, two ends of the middle tube 102 are respectively connected to the inner tube 101 and the outer tube 103 by thread or plug connection.

[0045] In some embodiments, the radial expansion rate of each of the inner bag 2 and the outer bag 3 is 200% to 250%.

[0046] It should be noted that the radial expansion rate refers to the ratio of the radial expansion of the bladder after filling with liquid, which is an important performance indicator of the bladder material. For example, if the diameter of a bladder is 10 cm before filling with liquid, and the diameter expands to 25 cm after being filled with slurry, then its radial expansion rate is 250%.

[0047] The radial expansion rate of the inner bag 2 and the outer bag 3 is between 200% and 250%, which means that they can expand sufficiently to adapt to and seal boreholes 200 of different diameters. This high expansion rate ensures that the bag can fit tightly to the wall of the borehole 200, thereby providing a better sealing effect. Due to the diversity of coal seam conditions, the diameter of the borehole 200 may vary. The bag with a high expansion rate can adapt to such changes, ensuring that the sealer 100 can work effectively in different coal seams. The high expansion rate also means that the bag is not easy to rupture when under pressure, which improves the reliability of the sealer 100 in a high-pressure grouting environment.

[0048] In some embodiments, the radial expansion strength of each of the inner bladder 2 and the outer bladder 3 is greater than 2.5 MPa.

[0049] Radial expansion strength refers to the maximum pressure that the bladder material can withstand in the radial direction, usually measured in MPa (megapascals). It is an important parameter to measure the pressure resistance of the bladder material.

[0050] During the gas extraction process, a high pressure may be generated inside the borehole 200. A radial expansion strength greater than 2.5 MPa means that the bag can maintain structural integrity under high pressure and will not rupture due to excessive pressure. A bag with high radial expansion strength can provide better stability, ensuring that the sealer 100 is fixed in the borehole 200 and avoiding displacement caused by pressure changes. The bag can still maintain a good expansion state under high pressure, which helps to more effectively seal the borehole 200 and prevent gas leakage.

[0051] In some embodiments, the relief pressure value of the one-way pressure relief valve 8 is 1.0 MPa to 1.5 MPa.

[0052] The pressure relief value of the one-way pressure relief valve 8 is set at 1.0MPa to 1.5MPa, and can be automatically opened when the grouting pressure exceeds this range, thereby preventing the internal pressure of the sealer 100 from being too high, avoiding damage to the sealer 100 or affecting the plugging effect. The setting of the pressure relief pressure value helps to control the grouting pressure inside the sealer 100, ensuring that the pressure is within a safe operating range, while also meeting the plugging requirements. The pressure relief pressure range of 1.0MPa to 1.5MPa can adapt to different coal seam conditions and grouting processes, providing flexibility for operators.

[0053] In some embodiments, the inner pouch 2 and / or the outer pouch 3 are circular pouches.

[0054] The round bladder can distribute pressure more evenly when the grout is expanded, which helps to achieve a better sealing effect because it can fit more closely to the wall of the borehole 200. The round design helps to reduce stress concentration points, thereby reducing the risk of damage to the bladder due to uneven pressure. The round bladder can provide more stable support after expansion, which helps to keep the sealer 100 in a fixed position in the borehole 200. The design and manufacture of the round bladder are generally simpler than other shaped bladders, which helps to reduce production costs. The round bladder can adapt to boreholes 200 of different diameters because it can be adjusted within a certain range to adapt to changes in the borehole 200.

[0055] The present invention also discloses a method for using a gas extraction drilling spiral sealer 100, comprising:

[0056] Step 1: Select a hole sealer 100 of appropriate length and diameter according to the diameter of the borehole 200. For example, if the borehole construction diameter is 94 mm, a 50 mm extraction tube 1 can be selected.

[0057] Step 2: According to the sealing parameter requirements, a connecting tube 7 and a pumping tube 1 of appropriate length are connected between the inner bag 2 and the outer bag 3 to meet the sealing requirements of the borehole 200.

[0058] Step three: Use a grouting pump to perform grouting through the outer grouting pipe 5, and observe the grouting pressure displayed on the grouting pump at the same time, and stop grouting when the grouting pressure of the grouting pump reaches a second preset value.

[0059] For example: the starting pressure of the one-way pressure relief valve 6 is set to 1.0MPa. During grouting, the inner bag 2 and the outer bag 3 are inflated and in close contact with the wall of the borehole 200. During this process, the grouting pressure gradually increases. When the grouting pressure exceeds 1.0MPa, the one-way pressure relief valve 6 opens, and the slurry is injected into the middle sealing section of the borehole. Continue grouting. When the grouting pump pressure gauge displays 1.5MPa, it means that the slurry pressure in the middle section of the borehole is 0.5MPa, and the slurry pressure in the bag is 1.0MPa, which meets the grouting sealing requirements. The actual starting pressure of the one-way pressure relief valve 6 and the grouting pressure in the middle section need to be determined according to the sealing process. The above is only a general example.

[0060] Step 4: After the grouting is completed, the external grouting pipe 5 is blocked, the grouting pump is cleaned, and the extraction pipe 1 is connected to the negative pressure pipeline for gas extraction.

[0061] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A gas extraction drilling spiral sealer, characterized in that: include: An extraction pipe (1), the extraction pipe (1) being used to be placed in a borehole to extract gas from a coal seam; An inner bag (2) and an outer bag (3), each of the inner bag (2) and the outer bag (3) being an elastic bag and spirally wound around the extraction pipe (1) along the axial direction of the extraction pipe (1), the inner bag (2) and the outer bag (3) being arranged at intervals along the axial direction of the extraction pipe (1), an inner grouting pipe (4) being provided at one end of the inner bag (2) adjacent to the outer bag (3), an outer grouting pipe (5) and an outer grouting pipe (6) being provided at both ends of the outer bag (3), the outer grouting pipe (6) being arranged adjacent to the inner grouting pipe (4), and the outer grouting pipe (6) being connected to the inner grouting pipe (4) via a connecting pipe (7); A one-way pressure relief valve (8), wherein the one-way pressure relief valve (8) is arranged on at least one of the outer grouting pipe (6) and the inner grouting pipe (4); when the grouting pressure of each of the inner bag (2) and the outer bag (3) exceeds a first preset value, the one-way pressure relief valve (8) opens to discharge grout into the borehole between the inner bag (2) and the outer bag (3).

2. The gas extraction drilling spiral sealer according to claim 1, characterized in that: Each of the outer grouting pipe (5), the outer grouting pipe (6) and the inner grouting pipe (4) extends along the axial direction of the extraction pipe (1) and is fixed to the extraction pipe (1) by a clamping piece (9).

3. The gas extraction drilling spiral sealer according to claim 2, characterized in that: An inner slurry outlet pipe (10) is provided at one end of the inner bag (2) away from the outer bag (3); the inner slurry outlet pipe (10) is fixed to the extraction pipe (1) via the buckling piece (9); a plug (11) is provided at the outlet of the inner slurry outlet pipe (10); the plug is detachably connected to the inner slurry outlet pipe (10).

4. The gas extraction drilling spiral sealer according to claim 2, characterized in that: The outlet of the outgoing slurry pipe (6) and the inlet of the inner grouting pipe (4) are provided with quick connectors (12), and the two ends of the connecting pipe (7) are respectively connected to the outgoing slurry pipe (6) and the inner grouting pipe (4) through the quick connectors (12).

5. The gas extraction drilling spiral sealer according to claim 1, characterized in that: The extraction tube (1) comprises an inner tube (101), an intermediate tube (102) and an outer tube (103); the two ends of the intermediate tube (102) are detachably connected to the inner tube (101) and the outer tube (103), respectively; the inner bag (2) is arranged on the inner tube (101), and the outer bag (3) is arranged on the outer tube (103).

6. The gas extraction drilling spiral sealer according to claim 1, characterized in that: The radial expansion rate of each of the inner bag (2) and the outer bag (3) is 200% to 250%.

7. The gas extraction drilling screw sealer according to claim 6, characterized in that: The radial expansion strength of each of the inner bladder bag (2) and the outer bladder bag (3) is greater than 2.5 MPa.

8. The gas extraction drilling spiral sealer according to claim 1, characterized in that: The pressure relief value of the one-way pressure relief valve (8) is 1.0 MPa to 1.5 MPa.

9. The gas extraction drilling spiral sealer according to claim 1, characterized in that: The inner pouch (2) and / or the outer pouch (3) are circular pouches.

10. A method for using a gas extraction drilling spiral sealer, characterized in that: include: Step 1: Select a hole sealer with appropriate length and diameter according to the diameter of the drilled hole; Step 2: According to the sealing parameter requirements, a connecting pipe (7) and a pumping pipe (1) of appropriate length are connected between the inner bag (2) and the outer bag (3) to meet the drilling sealing requirements; Step 3: Use a grouting pump to perform grouting through the external grouting pipe (5), while observing the grouting pressure displayed on the grouting pump, and stop grouting when the grouting pressure of the grouting pump reaches a second preset value; Step 4: After the grouting is completed, the external grouting pipe (5) is blocked, the grouting pump is cleaned, and the extraction pipe (1) is connected to the negative pressure pipeline for gas extraction.

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