CN216305880U - Gas drainage hole sealing device - Google Patents
Gas drainage hole sealing device Download PDFInfo
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- CN216305880U CN216305880U CN202122873619.1U CN202122873619U CN216305880U CN 216305880 U CN216305880 U CN 216305880U CN 202122873619 U CN202122873619 U CN 202122873619U CN 216305880 U CN216305880 U CN 216305880U
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- pipe
- grouting
- gas injection
- extraction pipe
- hole
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- 238000007789 sealing Methods 0.000 title claims abstract description 85
- 238000000605 extraction Methods 0.000 claims abstract description 108
- 238000002347 injection Methods 0.000 claims abstract description 73
- 239000007924 injection Substances 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004677 Nylon Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 229920001778 nylon Polymers 0.000 claims abstract description 4
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 9
- 239000002002 slurry Substances 0.000 description 9
- 239000003245 coal Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a gas extraction hole sealing device, which comprises an inner extraction pipe, a grouting hole sealing mechanism, a gas injection hole sealing mechanism and a gas injection hole sealing mechanism, wherein the inner extraction pipe is used for extending into a gas drilling hole, the lower end of the inner extraction pipe is used for being downwards connected with a perforated pipe which is deep into the drilling hole, the upper end of the inner extraction pipe is used for being connected with an outer extraction pipe, the gas injection hole sealing mechanism is used for sealing a drilling hole section corresponding to the lower part of the inner extraction pipe, and a grouting section is formed by the drilling hole section between the gas injection hole sealing mechanism and the grouting hole sealing mechanism; the grouting hole sealing mechanism is used for sealing a drilling section and a grouting section corresponding to the upper part of the extraction pipe; the gas injection hole sealing mechanism comprises a gas injection pump, a gas injection pipe, a gas injection hole and an annular expansion layer made of double-layer nylon cloth. The method has the advantages of very convenient drilling plugging process and low plugging cost, and avoids gas leakage caused by the development of a crack at a certain position in gas extraction. According to the utility model, the grouting hole sealing mechanism is used for sealing the corresponding drilling section at the upper part of the extraction pipe and sealing the grouting section, manual intervention is not needed in the switching process, and the method is convenient and efficient.
Description
Technical Field
The utility model belongs to the technical field of coal mine safety, relates to a coal mine gas prevention and control technology, and particularly relates to a hole sealing device for gas extraction.
Background
Gas is the first killer of coal mine safety, and the disaster caused by gas accounts for the most and the loss caused by gas accidents is the most serious in all mine disasters. The gas is the material basis of gas disasters such as coal and gas outburst, gas explosion and the like, and the gas extraction and the subsequent extraction of the coal mine are fundamental measures for gas control.
The key of pre-pumping before coal seam mining is the problem of plugging of gas extraction holes, and the plugging quality of the gas extraction holes directly influences the extraction effect, so that the gas extraction pipe and the surrounding rock space of the gas extraction pipe need to be plugged and sealed.
The gas extraction efficiency is reduced under the condition that gas leakage occurs after the extraction hole is used for a period of time due to the fact that cracks continuously develop after the coal seam is damaged by the drill hole, the gas leakage is mainly prevented and controlled by increasing the length of the plugging section at home at present, the material cost and the labor cost are increased, and the hole sealing effect cannot achieve the expected effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a gas extraction hole sealing device, which solves the problems of gas leakage caused by the development of gas extraction drill hole cracks and high cost of the prior art of increasing the length of a sealing section, and performs high-quality sealing on coal seam cracks at lower cost.
In order to achieve the aim, the gas extraction hole sealing device comprises an inner extraction pipe which is used for extending into a gas drill hole, the lower end of the inner extraction pipe is used for being downwards connected with a perforated pipe which extends deep into the drill hole, the upper end of the inner extraction pipe is used for being connected with an outer extraction pipe,
the gas injection and hole sealing mechanism is used for sealing a drilling section corresponding to the lower part of the inner extraction pipe, and the drilling section between the gas injection and hole sealing mechanism and the grouting and hole sealing mechanism forms a grouting section; the grouting hole sealing mechanism is used for sealing a drilling section and a grouting section corresponding to the upper part of the extraction pipe;
the gas injection hole sealing mechanism comprises a gas injection pump, a gas injection pipe, a gas injection hole and an annular expansion layer made of double-layer nylon cloth, wherein the upper end part and the lower end part of the expansion layer are respectively connected to the outer wall of the inner extraction pipe in a hot melting mode, and an expansion cavity is defined by the expansion layer and the outer wall of the inner extraction pipe;
the pipe wall of the inner extraction pipe is internally provided with the gas injection hole, the lower end of the gas injection hole is communicated with the expansion cavity, and a first one-way valve is arranged at the communicated part; the upper end of the gas injection hole is connected with the gas injection pipe, and the gas injection pipe extends to the outside of the drill hole and is connected with a gas injection pump.
The grouting hole sealing mechanism comprises a grouting pipe and a container bag made of a double-layer woven bag, the container bag is sleeved on the upper part of the inner extraction pipe, the upper end of the grouting pipe extends upwards out of the drill hole and is used for being connected with a grouting pump,
the grouting pipe is downwards attached to the outer wall of the inner extraction pipe and penetrates through the flexible container, the lower end part of the grouting pipe is positioned between the flexible container and the expansion layer, and a second one-way valve and a lower grouting opening are sequentially arranged at the lower end part of the grouting pipe from top to bottom;
the upper end and the lower end of the flexible freight bag are respectively clamped and pressed on the inner extraction pipe through the annular hoop and are tightly pressed and matched with the inner extraction pipe;
the part of the grouting pipe penetrating through the flexible freight bag is provided with an upper grouting opening, the upper grouting opening is connected with an insertion pipe, and the insertion pipe is inserted into the flexible freight bag and is used for grouting into the flexible freight bag; when the grouting pressure reaches the opening pressure of the second one-way valve, the flexible freight bag expands and blocks the upper part of the drilled hole under the action of the grouting pressure.
An upper pipe joint used for being connected with the outer extraction pipe is arranged at the upper end of the inner extraction pipe, and a lower pipe joint used for being connected with the perforated pipe is arranged at the lower end of the inner extraction pipe.
The utility model has the following advantages:
according to the utility model, the corresponding drill hole at the lower part of the inner extraction pipe is blocked by the gas injection hole sealing mechanism, and the corresponding drill hole at the upper part of the inner extraction pipe is firstly blocked by the grouting hole sealing mechanism, so that a closed annular space is enclosed between the grouting hole sealing mechanisms of the grouting hole sealing mechanism, and conditions are provided for grouting and blocking. And then grouting is carried out on a grouting section between the grouting hole sealing mechanism and the gas injection hole sealing mechanism through the grouting hole sealing mechanism, and the grouting position is changed from the flexible container to the drilling section, so that the automatic switching structure is very convenient. The method has the advantages of very convenient drilling plugging process and low plugging cost, and avoids gas leakage caused by the development of a crack at a certain position in gas extraction. According to the utility model, the grouting hole sealing mechanism is used for sealing the corresponding drilling section at the upper part of the extraction pipe and sealing the grouting section, manual intervention is not needed in the switching process, and the method is convenient and efficient.
The gas injection hole sealing mechanism has a simple structure and is convenient to manufacture; and starting the gas injection pump, controlling the gas injection pressure, and accordingly expanding the expansion cavity and plugging the drilling section at the lower part of the internal extraction pipe to form the bottom of the grouting section, so as to provide a foundation for further grouting and hole sealing. The gas injection hole is convenient for injecting gas into the expansion layer positioned in the drill hole from the upper part of the drill hole to the lower part, and a gas injection pipeline is not required to be fed into the drill hole in the gas injection process.
The grouting hole sealing mechanism is simple and ingenious in structure. The second one-way valve with proper opening pressure is selected according to the opening pressure of the second one-way valve, so that the upper part of the drill hole is sealed by the expansion degree of the flexible freight bag under the grouting pressure (slurry enters the flexible freight bag through the upper grouting opening) before the second one-way valve is opened, and the slurry entering the drill hole through the lower grouting opening can not flow out of the drill hole upwards after the second one-way valve is opened, so that grouting hole sealing is realized.
The utility model controls the grouting direction to be grouting into the container bag or grouting into the drilling section between the container bag and the expansion layer through the second one-way valve, and the switching of the grouting direction is automatically completed without manual intervention, so that the use is very convenient and the grouting efficiency is higher. The pipe joint is convenient for connecting the external extraction pipe and the perforated pipe.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
fig. 3 is a schematic view of the structure of the ring clamp.
Detailed Description
As shown in fig. 1 to 3, the gas extraction hole sealing device comprises an inner extraction pipe 9 extending into a gas borehole, wherein the lower end of the inner extraction pipe 9 is used for being connected with a perforated pipe extending into the borehole downwards, the upper end of the inner extraction pipe 9 is used for being connected with an outer extraction pipe, and the outer extraction pipe is used for being connected with a negative pressure extraction device; the perforated pipe and the outer extraction pipe are both conventional devices in gas extraction, and are not shown in the figure.
The inner extraction pipe 9 is obliquely and downwards inserted into a drill hole in use, so that one end of the inner extraction pipe 9, which is connected with the perforated pipe, is the lower end, and the other end of the inner extraction pipe, which is connected with the outer extraction pipe, is the upper end. The perforated pipe is a steel pipe with air holes on the pipe wall, the perforated pipe is used for being inserted into the deep part of a drill hole in gas extraction, the upper end of the perforated pipe is connected with the extraction pipe, and gas is extracted through the air holes in the perforated pipe.
In fig. 1, the left end of the inner extraction pipe 9 is the upper end thereof, and the right end of the inner extraction pipe 9 extends downwards into the inclined borehole and is connected with a perforated pipe for gas extraction deep in the borehole.
The utility model also comprises a grouting hole sealing mechanism and a gas injection hole sealing mechanism for sealing the drilling section corresponding to the lower part of the inner extraction pipe 9, wherein the drilling section between the gas injection hole sealing mechanism and the grouting hole sealing mechanism forms a grouting section; the grouting hole sealing mechanism is used for sealing a drilling section and a grouting section corresponding to the upper part of the extraction pipe;
the gas injection hole sealing mechanism comprises a gas injection pump 14, a gas injection pipe 13, a gas injection hole 15 and an annular expansion layer 2 made of double-layer nylon cloth, wherein the upper end and the lower end of the expansion layer 2 are respectively connected to the outer wall of the inner extraction pipe 9 in a hot melting mode, and an expansion cavity 16 is defined by the expansion layer 2 and the outer wall of the inner extraction pipe 9;
the gas injection hole 15 is arranged in the pipe wall of the inner extraction pipe 9, the lower end of the gas injection hole 15 is communicated with the expansion cavity 16, and a first one-way valve 17 is arranged at the communicated position. The first check valve 17 is used to prevent air leakage from the expansion chamber 16 after the air injection.
The upper end of the gas injection hole 15 is connected to the gas injection pipe 13 through a connector 18, and the gas injection pipe 13 extends to the outside of the drill hole and is connected to a gas injection pump 14. The connector 18 is conventional in the art of bore-tube connection, and the specific structure thereof will not be described in detail.
According to the utility model, the corresponding drill hole at the lower part of the inner extraction pipe 9 is plugged through the gas injection hole sealing mechanism, and the corresponding drill hole at the upper part of the inner extraction pipe 9 is plugged through the grouting hole sealing mechanism, so that a closed annular space is enclosed between the grouting hole sealing mechanisms of the grouting hole sealing mechanism, and conditions are provided for grouting plugging. And then grouting is carried out on a grouting section between the grouting hole sealing mechanism and the gas injection hole sealing mechanism through the grouting hole sealing mechanism, and the grouting position is changed from the flexible container to the drilling section, so that the automatic switching structure is very convenient. The plugging method has the advantages of long plugging drill hole section, very convenient plugging process and lower plugging cost, and avoids gas leakage caused by the development of cracks at certain position in gas extraction. According to the utility model, the grouting hole sealing mechanism is used for sealing the corresponding drilling section at the upper part of the extraction pipe and sealing the grouting section, manual intervention is not needed in the switching process, and the method is convenient and efficient.
The gas injection hole sealing mechanism has a simple structure and is convenient to manufacture; and starting the gas injection pump 14, controlling gas injection pressure, and accordingly expanding the expansion cavity 16 and plugging the drilling section at the lower part of the inner extraction pipe 9 to form the bottom of the grouting section and provide a foundation for further grouting and hole sealing. The gas injection hole 15 is convenient for injecting gas into the expansion layer 2 positioned in the drill hole from the upper part of the drill hole to the lower part, and the gas injection process does not need to feed a gas injection pipe 13 into the drill hole.
The grouting hole sealing mechanism comprises a grouting pipe 12 and a flexible freight bag 8 made of a double-layer woven bag, the flexible freight bag 8 is sleeved on the upper portion of the inner extraction pipe 9, the upper end of the grouting pipe 12 extends upwards out of a drilled hole and is used for being connected with a grouting pump, and the grouting pump is conventional equipment and is not shown in the drawing.
The grouting pipe 12 is attached to the outer wall of the inner extraction pipe 9 downwards and penetrates through the flexible container 8, the lower end part of the grouting pipe 12 is positioned between the flexible container 8 and the expansion layer 2, and the lower end part of the grouting pipe 12 is sequentially provided with a second one-way valve 5 and a lower grouting opening 4 from top to bottom;
the upper end and the lower end of the flexible freight bag 8 are respectively clamped and pressed on the inner extraction pipe 9 through an annular hoop and are tightly pressed and matched with the inner extraction pipe 9; the annular clamps include an upper annular clamp 10 at the upper end of the bulk bag 8 and a lower annular clamp 6 at the lower end of the bulk bag 8.
The shape of the annular hoop is matched with the shapes of the inner extraction pipe 9 and the grouting pipe 12 attached to the inner extraction pipe 9, namely the inner diameter of the main body of the annular hoop is matched with the outer diameter of the inner extraction pipe 9, so that the flexible container 8 is tightly pressed on the outer surface of the inner extraction pipe 9, and the radial bulge of the annular hoop at the grouting pipe 12 is provided with a pressing groove 19 matched with the grouting pipe 12, so that the flexible container 8 and the inner extraction pipe 9 are tightly pressed together.
The part of the grouting pipe 12 penetrating through the flexible freight bag 8 is provided with an upper grouting opening 7, the upper grouting opening 7 is connected with an insertion pipe, the insertion pipe is inserted into the flexible freight bag 8 and is used for grouting into the flexible freight bag 8, and the insertion pipe is in sealing fit with the flexible freight bag 8 (sealing structures such as hot melt sealing, binding sealing and the like can be adopted); when the grouting pressure reaches the opening pressure of the second one-way valve 5, the flexible freight bag 8 expands and blocks the upper part of the drilled hole under the action of the grouting pressure. The insertion tube is of a conventional tubular shape, not shown.
The grouting hole sealing mechanism is simple and ingenious in structure. The second one-way valve 5 with proper opening pressure is selected for use through the opening pressure of the second one-way valve 5, so that before the second one-way valve 5 is opened, the upper part of a drill hole is sealed by the expansion degree of the flexible freight bag 8 under the grouting pressure (slurry enters the flexible freight bag 8 through the upper grouting port 7), and after the second one-way valve 5 is opened, the slurry entering the drill hole through the lower grouting port 4 cannot flow out of the drill hole upwards, so that the grouting hole sealing is realized.
The utility model controls the grouting direction to be grouting into the flexible freight bag 8 or grouting into the drilling section between the flexible freight bag 8 and the expansion layer 2 through the second one-way valve 5, and the grouting direction switching is automatically completed without manual intervention, so that the utility model has the advantages of very convenient use and higher grouting efficiency.
An upper pipe joint 11 used for connecting the outer extraction pipe is arranged at the upper end of the inner extraction pipe 9, and a lower pipe joint 1 used for connecting the floral tube is arranged at the lower end of the inner extraction pipe 9. The pipe joint is conventional technology, and the specific structure is not described in detail.
During the use, gas injection pump 14 is connected with gas injection pipe 13, and gas injection pipe 13 is connected with gas injection hole 15, makes inflation layer 2 expand as required through the gas injection and provides the support for follow-up slip casting, prevents that the thick liquid from flowing into the drilling depths and forming extravagantly.
The inner extraction pipe 9 is connected with an outer extraction pipe outside the drill hole through an upper pipe joint 11, and the inner extraction pipe 9 is downwards connected with a perforated pipe used for extracting gas in the deep part of the drill hole through a lower pipe joint 1.
And starting the air injection pump 14, injecting air into the expansion layer 2 until the expansion layer 2 blocks the drilling section corresponding to the expansion layer 2 under the action of air pressure after the preset pressure is reached, and closing the air injection pump 14 at the moment.
The slurry is injected by the slurry injection pump through the slurry injection pipe 12, and the slurry fills the bulk bag 8 through the upper slurry injection port 7 and the insertion pipe to inflate the bulk bag 8. Along with the continuous grouting, the pressure in the flexible freight bag 8 is gradually increased, and the flexible freight bag 8 is gradually expanded and blocks the corresponding drilling section; after the pressure at the flexible container 8 rises to the opening pressure of the second one-way valve 5, the drilling section at the flexible container 8 is blocked by the flexible container 8, the second one-way valve 5 is opened, the grout is injected into the grouting section between the flexible container 8 and the expansion layer 2 through the grout injection port 4, the grouting is stopped after the preset pressure is reached, and the hole sealing of 'two-blocking one-injection' is realized. The plugging of the drilling section at the upper part of the inner extraction pipe 9 and the grouting of the grouting section are an automatic switching process, manual intervention is not needed, the operation is simple and convenient, and the hole sealing efficiency is obviously improved.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model and it is intended to cover in the claims the utility model as defined in the appended claims.
Claims (3)
1. A gas extraction hole sealing device comprises an inner extraction pipe which is used for extending into a gas drilling hole, the lower end of the inner extraction pipe is used for being downwards connected with a perforated pipe which extends into the drilling hole, the upper end of the inner extraction pipe is used for being connected with an outer extraction pipe,
the method is characterized in that:
the gas injection and hole sealing mechanism is used for sealing a drilling section corresponding to the lower part of the inner extraction pipe, and the drilling section between the gas injection and hole sealing mechanism and the grouting and hole sealing mechanism forms a grouting section; the grouting hole sealing mechanism is used for sealing a drilling section and a grouting section corresponding to the upper part of the extraction pipe;
the gas injection hole sealing mechanism comprises a gas injection pump, a gas injection pipe, a gas injection hole and an annular expansion layer made of double-layer nylon cloth, wherein the upper end part and the lower end part of the expansion layer are respectively connected to the outer wall of the inner extraction pipe in a hot melting mode, and an expansion cavity is defined by the expansion layer and the outer wall of the inner extraction pipe;
the pipe wall of the inner extraction pipe is internally provided with the gas injection hole, the lower end of the gas injection hole is communicated with the expansion cavity, and a first one-way valve is arranged at the communicated part; the upper end of the gas injection hole is connected with the gas injection pipe, and the gas injection pipe extends to the outside of the drill hole and is connected with a gas injection pump.
2. The gas extraction hole sealing device according to claim 1, characterized in that: the grouting hole sealing mechanism comprises a grouting pipe and a container bag made of a double-layer woven bag, the container bag is sleeved on the upper part of the inner extraction pipe, the upper end of the grouting pipe extends upwards out of the drill hole and is used for being connected with a grouting pump,
the grouting pipe is downwards attached to the outer wall of the inner extraction pipe and penetrates through the flexible container, the lower end part of the grouting pipe is positioned between the flexible container and the expansion layer, and a second one-way valve and a lower grouting opening are sequentially arranged at the lower end part of the grouting pipe from top to bottom;
the upper end and the lower end of the flexible freight bag are respectively clamped and pressed on the inner extraction pipe through the annular hoop and are tightly pressed and matched with the inner extraction pipe;
the part of the grouting pipe penetrating through the flexible freight bag is provided with an upper grouting opening, the upper grouting opening is connected with an insertion pipe, and the insertion pipe is inserted into the flexible freight bag and is used for grouting into the flexible freight bag; when the grouting pressure reaches the opening pressure of the second one-way valve, the flexible freight bag expands and blocks the upper part of the drilled hole under the action of the grouting pressure.
3. The gas extraction hole sealing device according to claim 1 or 2, characterized in that: an upper pipe joint used for being connected with the outer extraction pipe is arranged at the upper end of the inner extraction pipe, and a lower pipe joint used for being connected with the perforated pipe is arranged at the lower end of the inner extraction pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122873619.1U CN216305880U (en) | 2021-11-23 | 2021-11-23 | Gas drainage hole sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122873619.1U CN216305880U (en) | 2021-11-23 | 2021-11-23 | Gas drainage hole sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN216305880U true CN216305880U (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122873619.1U Expired - Fee Related CN216305880U (en) | 2021-11-23 | 2021-11-23 | Gas drainage hole sealing device |
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| Country | Link |
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| CN (1) | CN216305880U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075769A (en) * | 2022-06-22 | 2022-09-20 | 中国煤炭地质总局勘查研究总院 | Gas extraction drilling and hole sealing device and method |
-
2021
- 2021-11-23 CN CN202122873619.1U patent/CN216305880U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075769A (en) * | 2022-06-22 | 2022-09-20 | 中国煤炭地质总局勘查研究总院 | Gas extraction drilling and hole sealing device and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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