CN212656797U - Gas drainage drilling and hole sealing system based on semi-fluid slurry - Google Patents
Gas drainage drilling and hole sealing system based on semi-fluid slurry Download PDFInfo
- Publication number
- CN212656797U CN212656797U CN202020295470.6U CN202020295470U CN212656797U CN 212656797 U CN212656797 U CN 212656797U CN 202020295470 U CN202020295470 U CN 202020295470U CN 212656797 U CN212656797 U CN 212656797U
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- Prior art keywords
- hole
- mixing drum
- grouting pipe
- drill hole
- gas extraction
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- 238000007789 sealing Methods 0.000 title claims abstract description 40
- 239000002002 slurry Substances 0.000 title claims abstract description 36
- 238000005553 drilling Methods 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims description 27
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 239000003245 coal Substances 0.000 claims description 14
- 238000007569 slipcasting Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000011440 grout Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model provides a gas drainage drilling hole sealing system based on semifluid thick liquid, include: the hole sealing device comprises a mixing drum for storing slurry; the bottom of the mixing drum is connected with a grouting pipe; a switch valve is arranged on the grouting pipe; the grouting pipe penetrates through the hole packer and extends into the drill hole; the mixing drum is horizontally arranged; a feed inlet and a water inlet are formed in the side surface of the mixing drum; one end of the mixing drum is open; the hole sealing device also comprises a pushing piston and at least one auxiliary grouting pipe; the pushing piston is arranged at the open end of the mixing drum; the pushing piston is fixed at the output end of a driving device; one hole packer is provided with a pressure sensor for monitoring the pressure of the slurry in the drill hole. The utility model discloses can realize sealing drilling and the cracked real time of drilling, ration, it is sealed effectual.
Description
Technical Field
The utility model belongs to the technical field of the gas is taken out and is adopted the sealed technique, especially, relate to a gas is taken out and is adopted drilling hole sealing system based on semifluid thick liquid.
Background
At present, gas extraction is a main means for controlling gas disasters in coal mines and is also a necessary link for fully utilizing clean energy and reducing emission. When using gas, the demand for gas concentration is high because the technology for using low-concentration gas is immature and the efficiency is low. Therefore, the key problem of gas extraction is to improve the extracted gas concentration, and the main reason of the reduction of the drilled extracted gas concentration is caused by air leakage of coal wall cracks due to poor hole sealing. For this reason, bore sealing is of particular importance.
CN102913273B discloses a coal mine autonomous dynamic hole sealing gas extraction intelligent system, which mainly comprises a gas extraction device, an autonomous dynamic hole sealing device and an automatic monitoring control device capable of monitoring and controlling a gas automatic extraction pump, a gas concentration automatic detector and a feeding pressure automatic control pump. The automatic control pump is pressurized through feeding pressure to form pressurized liquid flowing into the dynamic liquid injection area, and pressurized fluid can timely flow into the dynamic liquid injection area to block the pores to prevent air leakage due to certain pressure when cracks in a pressure relief coal bed develop, so that the sealing effect is achieved. However, the above system has the following drawbacks: 1) because the system can not automatically monitor the development condition of the cracks around the drill hole, the real-time plugging of the cracks of the drill hole can not be realized, and the sealing effect is poor. 2) The system can only monitor the pressure of the liquid with pressure, but cannot realize the quantitative injection of the liquid with pressure, and the sealing effect is poor.
Disclosure of Invention
An object of the utility model is to provide a gas takes out and adopts drilling hole sealing system based on semifluid thick liquid can realize sealing sealed effectual to drilling and the cracked real time, ration of drilling. In order to achieve the above purpose, the utility model adopts the following technical scheme:
a gas drainage drilling and sealing system based on semi-fluid slurry comprises:
the gas extraction device is arranged in the drill hole; two ends of the drill hole are provided with hole packers;
the hole sealing device comprises a mixing drum for storing slurry; the bottom of the mixing drum is connected with a grouting pipe; a switch valve is arranged on the grouting pipe; the grouting pipe penetrates through the hole packer and extends into the drill hole;
the mixing drum is horizontally arranged; a feed inlet and a water inlet are formed in the side surface of the stirring cylinder; one end of the stirring cylinder is open;
the hole sealing device also comprises a pushing piston and at least one auxiliary grouting pipe; the pushing piston is arranged at the open end of the mixing drum; the pushing piston is fixed at the output end of a driving device;
the auxiliary grouting pipe is arranged in the coal seam at the drilling hole; the auxiliary grouting pipe is parallel to the drill hole; the diameter of the auxiliary grouting pipe is smaller than that of the drill hole;
one hole packer is provided with a pressure sensor for monitoring the pressure of the slurry in the drill hole;
and in a grouting state, the pressure sensor is communicated with the input end of the control device, and the output end of the control device is communicated with the switch valve and the driving device.
Preferably, the water inlet is connected with a water injection pipe; the top end of the water injection pipe is communicated with a water source.
Preferably, a bin is arranged on the feeding hole; the storage bin is funnel-shaped; the small end of the bin is communicated with the feed inlet.
Preferably, the gas extraction device comprises a gas extraction pipe; and the gas extraction pipe penetrates through the drill hole and extends into the coal seam.
Preferably, one end of the mixing drum, which is far away from the grouting pipe, is provided with the pushing piston.
Preferably, a first electric valve is installed at the feeding port; a second electric valve is arranged at the water inlet;
a slurry concentration detection device is arranged on one side of the liquid inlet end of the grouting pipe; the slurry concentration detection device is fixed on the inner wall of the stirring cylinder;
and when the slurry concentration detection device is in a stirring state, the slurry concentration detection device is electrically communicated with the input end of the control device, and the output end of the control device is respectively electrically communicated with the first electric valve, the second electric valve and the stirring cylinder.
Compared with the prior art, the utility model has the advantages that:
1) the pressure in the drill hole is monitored in real time through the pressure sensor to monitor the development condition of the hole crack, quantitative injection grouting is realized through the matching of the driving device, the pushing piston and the mixing drum, so that the real-time and quantitative sealing of the drill hole and the drill hole crack is completed, and the sealing effect is good.
2) The auxiliary grouting pipe can assist in solving the problems that the grouting pressure of the grouting pipe is insufficient and the grout cannot actively plug the cracks, and the auxiliary grouting pipe directly performs grouting plugging on the cracks of the coal seam.
Drawings
Fig. 1 is a structural diagram of a gas extraction drilling and sealing system based on semi-fluid slurry according to an embodiment of the present invention;
fig. 2 is an enlarged view of the positional relationship between the auxiliary grout pipe and the drilled hole in fig. 1.
The system comprises a control device 1, a storage bin 2, a first electric valve 3, a pushing piston 4, a stirring blade 5, a water source 6, a water injection pipe 7, a second electric valve 8, a switching valve 9, a drilling hole 10, a gas extraction pipe 11, a negative pressure collection device 12, a pressure sensor 13, a hole packer 14, a stirring cylinder 15, a grouting pipe 16, an auxiliary grouting pipe 17 and a slurry concentration detection device 18.
Detailed Description
The present invention will now be described in more detail with reference to the drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art could modify the invention herein described while still achieving the beneficial effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
As shown in fig. 1, a gas extraction borehole sealing system based on semi-fluid slurry includes: gas drainage device and hole sealing device. In this embodiment, mainly through carrying out structural design to the hole sealing device to realize the monitoring to the drilling crack condition of developing, later through quantitative injection slip casting, realize the real-time, quantitative sealed to drilling 10, drilling crack, sealed effectual. In addition, the auxiliary grouting pipe 17 is additionally arranged, so that the problems that the grouting pressure of the grouting pipe 16 is insufficient and the grout cannot actively plug the cracks can be solved, and the auxiliary grouting pipe 17 directly plugs the cracks of the coal seam in a grouting manner. The concrete structures of the hole sealing device and the gas extraction device are as follows:
the hole sealing device comprises a mixing drum 15 for storing slurry, at least one auxiliary grouting pipe 17 and a pushing piston 4. Specifically, the method comprises the following steps:
the bottom of the mixing drum 15 is connected with the upper port of a grouting pipe 16; the grouting pipe 16 is provided with a switch valve 9; the lower port of the grouting pipe 16 penetrates through the hole packer 14 and extends into the drill hole 10; the mixing drum 15 is horizontally arranged; a feed inlet and a water inlet are formed in the side surface of the mixing drum 15; one end of the agitating drum 15 is open; the pushing piston 4 is arranged at the open end of the mixing drum 15; the push piston 4 is fixed at the output end of a driving device. In this embodiment, the driving means may be a stepping motor.
An auxiliary grouting pipe 17 is installed in the coal seam at the borehole 10; the auxiliary grouting pipe 17 is parallel to the borehole 10; the diameter of the secondary grouting pipe 17 is smaller than the diameter of the borehole 10. If the rotating speed of the stirring blades 5 in the stirring cylinder 15 reaches the maximum, and the pressure in the drill hole 10 can not reach the specified value all the time, grouting into the coal seam cracks through the auxiliary grouting holes on the two sides.
The gas extraction device is arranged in the drill hole 10; a hole packer 14 is arranged at each end of the drill hole 10; the hole packer 14 is fitted with a pressure sensor 13 for monitoring the pressure of the slurry in the borehole 10, which when the pressure in the borehole 10 drops indicates that a borehole fracture is developing, resulting in the flow of grouting fluid into the borehole fracture. The gas extraction device comprises a negative pressure collecting device 12 and a gas extraction pipe 11 communicated with the negative pressure collecting device 12; the negative pressure collection device 12 is placed outside the borehole 10, and the gas extraction pipe 11 passes through the borehole 10 and extends into the coal seam.
In the grouting state, the pressure sensor 13 is communicated with the input end of the control device 1, and the output end of the control device 1 is communicated with the switch valve 9 and the driving device. At this time, the grouting pressure in the drill hole 10 is lower than the pressure of the mixing drum 15 and the drill hole 10, the driving device pushes the grouting in the mixing drum 15, and the grouting enters the drill hole 10 through the mixing drum 15 and the grouting pipe 16. This indicates that the borehole fracture has developed such that the grout within the borehole 10 flows into the borehole fracture.
In this embodiment, the end of the mixing drum 15 away from the grouting pipe 16 is provided with a pushing piston 4, which facilitates the placement of the driving device.
In this embodiment, the mixer drum 15 and the slurry injection pipe 16 are further configured so that the slurry concentration is detected by the slurry concentration detection device 18, and the ratio of the powder in the silo 2 to the water in the water injection pipe 7 is controlled by the control device 1 so that the slurry injection concentration is always maintained at a predetermined value, thereby maintaining a constant slurry injection concentration. Specifically, the method comprises the following steps:
a feed bin 2 is arranged on the feed inlet; the storage bin 2 is funnel-shaped; the small end of the bin 2 is communicated with the feeding hole. A first electric valve 3 (between the bin 2 and the mixing drum 15) is arranged at the feeding port; the water inlet is connected with a water injection pipe 7; the top end of the water injection pipe 7 is communicated with a water source 6; a second electric valve 8 (between the water injection pipe 7 and the mixing drum 15) is arranged at the water inlet; a slurry concentration detection side device 18 is arranged on one side of the liquid inlet end of the grouting pipe 16; the slurry concentration detection side device 18 is fixed on the inner wall of the mixing drum 15;
during the stirring state, the slurry concentration detection side device 18 is electrically communicated with the input end of the control device 1, and the output end of the control device 1 is respectively electrically communicated with the first electric valve 3, the second electric valve 8 and the stirring cylinder 15. At this time, the on-off valve 9 is closed, and then the materials in the silo 2 and the water in the water injection pipe 7 enter the mixing drum 15, and the mixing blade 5 starts to work.
In this embodiment, the powder material in the storage bin 2 is a mixture of a main material and an auxiliary material, wherein the main material is a mixture of sodium bentonite and kaolin, and the auxiliary material is a mixture of one or more of sodium silicate, lithium silicate, silicon dioxide and sodium chloride. The mixed grouting is non-solidified inorganic semi-fluid hole sealing slurry and is always kept in a non-dehydration state during the whole plugging period, so that certain fluidity is maintained; cementing grouting can also play a certain elastic supporting role on the wall of the drill hole 10, so that the compactness of the drill hole 10 is effectively improved, and the seepage quantity of the continuously acting static water is reduced.
In this embodiment, the sealing method of the hole sealing system of the gas extraction borehole 10 includes the following steps:
the method comprises the steps that firstly, the opening degree of a first electric valve 3 is set to be Ki, i is set to be variable, the first electric valve 3 is controlled to be opened to a certain opening degree through a control device 1, the initial value of the volume ratio of water to material is set to be powder: water =8:1 through the control device 1, and the minimum grouting concentration meeting the requirement of stratum grouting is set to be min;
secondly, setting an initial propeller rotation speed n =500r/min, fully stirring the materials and water, recording a grouting concentration Pi value through a grouting concentration detector after stirring for a period of time, judging whether the grouting concentration Pi is within a set range value, if the concentration is smaller than a set value, assigning a value of n +100 to n, and repeating the steps until the grouting concentration Pi meets the requirement;
thirdly, when the rotating speed of the stirring blade 5 is greater than the set limit value and the grouting concentration Pi still does not meet the condition, giving the value of Ki +10% to Ki, and repeating the second step until the grouting concentration Pi meets the requirement;
fourthly, the controller 1 sends a signal to a driving device of the pushing piston 4, so that the pushing piston 4 moves inwards and pushes the slurry in the mixing drum 15 to be injected into the drill hole 10 at the pressure of 2-3 MPa for a period of time, the pressure sensor 13 records the grouting pressure Qi, whether the pressure is equal to or greater than 3MPa is judged, if not, the steps are repeated, and if yes, the operation is finished;
and fifthly, resetting the control device 1 and all parts to zero after 10-20 d intervals, restarting an operation program, and repeating the steps from one step to four steps to seal the hole again.
The utility model discloses a theory of operation does:
when in a stirring state: the concentration of the slurry is detected by a slurry concentration detection device 18, and the proportion of powder and water is controlled by a control device 1, so that the grouting concentration is always kept at a specified value;
in a grouting state: the powder in the storage bin 2 and water are stirred by a stirring cylinder 15 to form fluid grouting (slurry) and are injected into the drill hole 10 through a grouting pipe 16, a pressure sensor 13 arranged on a hole packer 14 feeds back the pressure in the drill hole 10, and when the pressure in the drill hole 10 drops, the grouting is caused to flow into the drill hole cracks due to the development of the drill hole cracks. Therefore, when the pressure value measured by the pressure sensor 13 decreases, the pressure sensor 13 is communicated with the control device 1, and the control device 1 sends a signal to the driving device of the pushing piston 4, so that the pushing piston 4 moves inwards and pushes the grouting in the mixing drum 15 to be injected into the drill hole 10 through the grouting pipe 16 until the pressure fed back by the pressure sensor 13 is stable.
In summary, the hole sealing system for the gas extraction borehole 10 of the embodiment has the following advantages:
1) the pressure in the drill hole 10 is monitored in real time through the pressure sensor 13 to monitor the development condition of the hole crack during drilling, quantitative injection grouting is realized through the matching of the driving device, the pushing piston 4 and the mixing drum 15, so that the real-time and quantitative sealing of the drill hole 10 and the drill hole crack is completed, and the sealing effect is good.
2) The auxiliary grouting pipe 17 can assist in solving the problems that the grouting pressure of the grouting pipe 16 is insufficient and the grout cannot actively plug the cracks, and the auxiliary grouting pipe 17 directly plugs the cracks of the coal seam.
3) The grouting concentration can be kept constant.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (5)
1. A gas drainage drilling and sealing system based on semi-fluid slurry comprises:
the gas extraction device is arranged in the drill hole; two ends of the drill hole are provided with hole packers;
the hole sealing device comprises a mixing drum for storing slurry; the bottom of the mixing drum is connected with a grouting pipe; a switch valve is arranged on the grouting pipe; the grouting pipe penetrates through the hole packer and extends into the drill hole;
the device is characterized in that the mixing drum is horizontally arranged; a feed inlet and a water inlet are formed in the side surface of the stirring cylinder; one end of the stirring cylinder is open;
the hole sealing device also comprises a pushing piston and at least one auxiliary grouting pipe; the pushing piston is arranged at the open end of the mixing drum; the pushing piston is fixed at the output end of a driving device;
the auxiliary grouting pipe is arranged in the coal seam at the drilling hole; the auxiliary grouting pipe is parallel to the drill hole; the diameter of the auxiliary grouting pipe is smaller than that of the drill hole;
one hole packer is provided with a pressure sensor for monitoring the pressure of the slurry in the drill hole;
in a grouting state, the pressure sensor is communicated with the input end of the control device, and the output end of the control device is communicated with the switch valve and the driving device; the driving device is a stepping motor.
2. The semi-fluid slurry based gas extraction borehole sealing system of claim 1, wherein the water inlet is connected to a water injection pipe; the top end of the water injection pipe is communicated with a water source.
3. The semi-fluid slurry based gas extraction borehole sealing system according to claim 1, wherein a bin is provided at the feed inlet; the storage bin is funnel-shaped; the small end of the bin is communicated with the feed inlet.
4. The semi-fluid slurry based gas extraction borehole sealing system of claim 1, wherein the gas extraction device comprises a gas extraction pipe; and the gas extraction pipe penetrates through the drill hole and extends into the coal seam.
5. The semi-fluid slurry based gas extraction borehole sealing system of claim 1, wherein the pushing piston is disposed at an end of the mixing drum away from the slip casting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020295470.6U CN212656797U (en) | 2020-03-11 | 2020-03-11 | Gas drainage drilling and hole sealing system based on semi-fluid slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020295470.6U CN212656797U (en) | 2020-03-11 | 2020-03-11 | Gas drainage drilling and hole sealing system based on semi-fluid slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212656797U true CN212656797U (en) | 2021-03-05 |
Family
ID=74765167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020295470.6U Expired - Fee Related CN212656797U (en) | 2020-03-11 | 2020-03-11 | Gas drainage drilling and hole sealing system based on semi-fluid slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212656797U (en) |
-
2020
- 2020-03-11 CN CN202020295470.6U patent/CN212656797U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210305 |
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| CF01 | Termination of patent right due to non-payment of annual fee |