Gas extraction drill hole sealing device

Abstract

The utility model relates to drilling hole sealing, and provides a gas extraction drilling hole sealing device which comprises a pair of sealing devices and a pressurizing device connected with the pair of sealing devices at the same time. The pair of sealing devices are arranged on the outer wall of the extraction pipe in a sleeving manner; the heights of the pair of sealing devices are different; the sealing device comprises a sealing bag and a first diaphragm horizontally arranged in the sealing bag; the first diaphragm divides the sealing bag into an upper sealing cavity and a lower sealing cavity; a sealing material A is arranged in the upper sealing cavity, a sealing material B is arranged in the lower sealing cavity, and the pressurizing device is communicated with the upper sealing cavity; and the sealing material A and the sealing material B are expanded and cured after being mixed. The hole sealing device for the gas extraction drill hole can accurately expand and solidify at the appointed position of the drill hole.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling sealing, and more specifically, to a gas drainage borehole sealing device. Background Technique

[0002] The coal mine gas drainage borehole sealing technology directly affects the drainage efficiency. The existing gas drainage borehole sealing technologies include the cement mortar sealing method, the wooden wedge and yellow mud sealing method, the polyurethane foam sealing method (GSS sealing bag), and the synthetic resin and cement slurry pressure grouting (two-block one-injection).

[0003] Among them, the polyurethane foam sealing method refers to manually stirring and mixing the polyurethane A and B components, and after stirring, using cotton cloth to adsorb and wrap them on the gas drainage pipeline, and inserting them into the drainage hole together with the gas drainage pipeline. Due to the advantages of fast curing speed, high expansion ratio, strong adhesion to the coal wall, relatively high strength and toughness of polyurethane foam, the polyurethane foam sealing method has been widely promoted and applied.

[0004] In actual operation, since the polyurethane A and B components are pre-mixed and then sent into the borehole, before being sent to the designated position in the borehole, they have already started to partially expand and cure, and some will adhere to the inner wall of the borehole (not at the designated position) after expansion, so that the amount of polyurethane reaching the designated position may be insufficient, resulting in poor sealing effect after expansion and curing. Therefore, it is necessary to design a sealing device that can better control its expansion and curing process. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a gas drainage borehole sealing device, which can accurately expand and cure at the designated position in the borehole.

[0006] The gas drainage borehole sealing device of the utility model includes a pair of sealing devices and a pressurizing device connected to the pair of sealing devices at the same time; the pair of sealing devices are both sleeved on the outer wall of the drainage pipe; the heights of the pair of sealing devices are different; the sealing device includes a sealing bag and a first diaphragm horizontally arranged in the sealing bag; the first diaphragm divides the sealing bag into an upper sealing cavity and a lower sealing cavity; the upper sealing cavity is provided with sealing material A, the lower sealing cavity is provided with sealing material B, and the pressurizing device is communicated with the upper sealing cavity; the sealing material A and the sealing material B will expand and cure after mixing.

[0007] Further, both the sealing material A and the sealing material B belong to polyurethane sealing materials.

[0008] Further, it also includes a grouting machine and a grouting pipe connected to the grouting machine; the end of the grouting pipe away from the grouting machine is arranged between the pair of sealing devices.

[0009] Further, a plurality of second diaphragms are provided in the upper sealing cavity, and the plurality of second diaphragms are circumferentially distributed around the axis of the extraction pipe; the second diaphragms divide the upper sealing cavity into a plurality of pressurizing cavities; each pressurizing cavity is connected to a pressurizing device; and sealing material A is provided in each pressurizing cavity.

[0010] Further, the thickness of the second diaphragm is greater than the thickness of the first diaphragm.

[0011] Further, a plurality of grooves are provided on the first diaphragm, and the grooves are provided in each pressurizing cavity.

[0012] Further, the volume of the upper sealing cavity is smaller than the volume of the lower sealing cavity.

[0013] Further, the pressurizing device includes a pneumatic machine and a pneumatic pipe connected to the pneumatic machine; the pneumatic pipe communicates with the upper sealing cavity.

[0014] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: When the gas extraction borehole sealing device of the present invention is in use, after a pair of sealing devices are lowered to a specified depth of the borehole, the pressurizing device is used to quickly inject high-pressure air into the upper sealing cavity, so that the air pressure in the upper sealing cavity rapidly increases. When the air pressure increases to a certain extent, the first diaphragm is broken, and the sealing material A in the upper sealing cavity is quickly injected into the sealing material B in the lower sealing cavity under the push of the air flow and quickly mixes and expands and solidifies with the sealing material B. After expanding and solidifying, it can fully fill the gap between the drill pipe and the borehole. In this way, mixing the sealing material in the borehole can effectively extend the lowering time of the sealing device, and the positioning can be more accurate during the lowering process, and the sealing device can also better expand and solidify at the specified depth. And the mixing is more efficient and sufficient, and the plugging effect of the sealing material is better. Description of the Drawings

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the embodiment will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained according to these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the gas extraction borehole sealing device provided by the embodiment of the present invention;

[0017] Figure 2 It is a schematic internal structural diagram of the gas extraction borehole sealing device provided by the embodiment of the present invention;

[0018] Figure 3 Schematic structural diagram of the sealing device part provided by the embodiment of the present utility model;

[0019] Figure 4 Schematic structural diagram of the interior of the sealing device provided by the embodiment of the present utility model;

[0020] Figure 5 Schematic structural diagram of the interior of the pressure chamber provided by the embodiment of the present utility model.

[0021] Reference numerals: 11 - gas drainage pipe, 12 - grouting pipe, 13 - air pressure pipe, 20 - sealing device, 21 - sealing bag, 22 - first diaphragm, 23 - lower sealing chamber, 24 - upper sealing chamber, 25 - second diaphragm, 26 - pressure chamber, 27 - groove. Detailed implementation manners

[0022] Embodiment

[0023] The following is further described in conjunction with specific embodiments. As shown in the attached Figure 1 - attached Figure 5 As shown, the gas drainage borehole sealing device of this embodiment includes a pair of sealing devices 20 and a pressurizing device connected to the pair of sealing devices 20 at the same time; the pair of sealing devices 20 are both sleeved on the outer wall of the gas drainage pipe 11; the heights of the pair of sealing devices 20 are different; the sealing device 20 includes a sealing bag 21 and a first diaphragm 22 horizontally arranged in the sealing bag 21; the first diaphragm 22 divides the sealing bag 21 into an upper sealing chamber 24 and a lower sealing chamber 23; sealing material A is provided in the upper sealing chamber 24, and sealing material B is provided in the lower sealing chamber 23, and the pressurizing device is communicated with the upper sealing chamber 24; the sealing material A and the sealing material B will expand and solidify after being mixed. Specifically, when using, after the pair of sealing devices 20 are lowered to the designated depth of the borehole, the pressurizing device is used to quickly inject high-pressure air into the upper sealing chamber 24, so that the air pressure in the upper sealing chamber 24 increases rapidly. When the air pressure increases to a certain extent, the first diaphragm 22 is broken, and the sealing material A in the upper sealing chamber 24 is quickly injected into the sealing material B in the lower sealing chamber 23 under the push of the air flow and quickly mixes and expands and solidifies with the sealing material B. After expanding and solidifying, it can fully fill the gap between the drill pipe and the borehole. In this way, the mixing of the sealing material is carried out in the borehole, which can effectively extend the lowering time of the sealing device 20, and can be more accurately positioned during the lowering process, and the sealing device 20 can also better expand and solidify at the designated depth. And the mixing is more efficient and sufficient, and the sealing effect of the sealing material is better.

[0024] Both sealant A and sealant B in this embodiment belong to polyurethane sealants. Specifically, polyurethane building sealant is a two-component reaction-curing type, consisting of two components, A and B. Component A is a milky white or light yellow viscous polyurethane prepolymer, and component B is a black paste or liquid formed by mixing and dehydrating curing agents and additives. After curing, it has a certain elasticity and adhesiveness. It is relatively mature and widely used in industry (sealant A and sealant B in this embodiment are polyurethane foaming agents purchased from Langfang Runjia Thermal Insulation Engineering Co., Ltd.).

[0025] In this embodiment, it further includes a grouting machine and a grouting pipe 12 connected to the grouting machine; one end of the grouting pipe 12 far from the grouting machine is arranged between a pair of sealing devices 20. Specifically, after both sealing devices 20 are cured, filling the area between them with cement mortar can better seal them. And the sealing strength is higher.

[0026] In the upper sealing cavity 24 of this embodiment, a plurality of second diaphragms 25 are provided, and the plurality of second diaphragms 25 are circumferentially distributed with respect to the axis of the extraction pipe 11; the second diaphragms 25 divide the upper sealing cavity 24 into a plurality of pressurizing cavities 26; each pressurizing cavity 26 is connected to a pressurizing device; and sealant A is provided in each pressurizing cavity 26. Specifically, when pressurizing the pressurizing cavity 26, the second diaphragm 25 in each pressurizing cavity 26 will rupture, and the sealant A in each pressurizing cavity 26 will be injected into the sealant B, so that the mixing of sealant A and sealant B is more efficient, rapid and sufficient.

[0027] The thickness of the second diaphragm 25 in this embodiment is greater than the thickness of the first diaphragm 22. A plurality of grooves 27 are provided on the first diaphragm 22, and grooves 27 are provided in each pressurizing cavity 26. Specifically, by adjusting the thicknesses of the first diaphragm 22 and the second diaphragm 25, and by providing grooves 27 on the second diaphragm 25, the thickness at the grooves 27 is the lowest and it is most likely to rupture.

[0028] The volume of the upper sealing cavity 24 in this embodiment is smaller than the volume of the lower sealing cavity 23. Specifically, after the sealant A fully enters the sealant B, there is enough space for mixing.

[0029] The pressurizing device in this embodiment includes a pneumatic machine and a pneumatic pipe 13 connected to the pneumatic machine; the pneumatic pipe 13 is communicated with the upper sealing cavity 24.

[0030] In summary, for the gas drainage borehole sealing device of this embodiment, when in use, after lowering a pair of sealing devices 20 to the designated depth of the borehole, the pressurizing device is used to quickly inject high-pressure air into the upper sealing cavity 24, so that the air pressure in the upper sealing cavity 24 rapidly increases. When the air pressure increases to a certain extent, the first diaphragm 22 is ruptured. The sealing material A in the upper sealing cavity 24 is quickly injected into the sealing material B in the lower sealing cavity 23 under the push of the air flow and quickly mixes and expands and solidifies with the sealing material B. After expanding and solidifying, it can fully fill the gap between the drill pipe and the borehole. In this way, mixing the sealing material in the borehole can effectively extend the lowering time of the sealing device 20, and the positioning can be more accurate during the lowering process. Moreover, the sealing device 20 can also better expand and solidify at the designated depth. And the mixing is more efficient and sufficient, and the plugging effect of the sealing material is better.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas extraction drilling hole sealing device, characterized in that: It comprises a pair of sealing devices (20) and a pressurizing device connected to the pair of sealing devices (20); the pair of sealing devices (20) are both sleeved on the outer wall of the extraction tube (11); the pair of sealing devices (20) have different heights; The sealing device (20) comprises a sealing bag (21) and a first diaphragm (22) horizontally arranged in the sealing bag (21); the first diaphragm (22) divides the sealing bag (21) into an upper sealing chamber (24) and a lower sealing chamber (23); a sealing material A is arranged in the upper sealing chamber (24), and a sealing material B is arranged in the lower sealing chamber (23); the pressurizing device is connected to the upper sealing chamber (24); the sealing material A and the sealing material B expand and solidify after mixing.

2. The gas extraction drilling and sealing device according to claim 1, characterized in that: The sealing material A and the sealing material B are both polyurethane sealing materials.

3. The gas extraction drilling and sealing device according to claim 1, characterized in that: It also includes a grouting machine and a grouting pipe (12) connected to the grouting machine; one end of the grouting pipe (12) away from the grouting machine is arranged between a pair of sealing devices (20).

4. The gas extraction drilling hole sealing device according to claim 1, characterized in that: A plurality of second diaphragms (25) are arranged in the upper sealing chamber (24), and the plurality of second diaphragms (25) are distributed in a circle around the axis of the extraction tube (11); the second diaphragms (25) divide the upper sealing chamber (24) into a plurality of pressurized chambers (26); each of the pressurized chambers (26) is connected to a pressurizing device; and each of the pressurized chambers (26) is provided with a sealing material A.

5. The gas extraction drilling and sealing device according to claim 4, characterized in that: The thickness of the second diaphragm (25) is greater than the thickness of the first diaphragm (22).

6. The gas extraction drilling hole sealing device according to claim 5, characterized in that: The first diaphragm (22) is provided with a plurality of grooves (27), and each of the pressurizing chambers (26) is provided with a groove (27).

7. The gas extraction drilling and sealing device according to claim 1, characterized in that: The volume of the upper sealed cavity (24) is smaller than the volume of the lower sealed cavity (23).

8. The gas extraction drilling hole sealing device according to claim 1, characterized in that: The pressurizing device comprises an air compressor and an air pressure pipe (13) connected to the air compressor; the air pressure pipe (13) is in communication with the upper sealing chamber (24).

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