CN109538157B - Flexible hole sealing system and method for coal mine gas pre-extraction drill hole - Google Patents
Flexible hole sealing system and method for coal mine gas pre-extraction drill hole Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 138
- 238000007789 sealing Methods 0.000 title claims abstract description 99
- 239000003245 coal Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 56
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 55
- 238000003860 storage Methods 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 description 16
- 238000007569 slipcasting Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000005065 mining Methods 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 210000004712 air sac Anatomy 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention discloses a flexible hole sealing system and a method for a coal mine gas pre-drainage borehole, wherein the system comprises a hole sealing mechanism, a gas extraction mechanism and a grouting mechanism, the hole sealing mechanism comprises an extraction pipe, a grouting pipe and two pressurizing pipes which are arranged side by side, one end of the gas extraction is taken as an inner end in a gas pre-drainage borehole space, the other end of the gas pre-drainage borehole space is taken as an outer end, a front air bag, a middle air bag and a rear air bag are sequentially arranged in the gas pre-drainage borehole space from outside to inside, the middle air bag consists of an upper air bag and a lower air bag which are symmetrically arranged from top to bottom, the extraction pipe penetrates through the front air bag and the rear air bag and is clamped between the upper air bag and the lower air bag, and one of the two pressurizing pipes sequentially penetrates through the front air bag and the upper air bag and penetrates through the rear air bag from outside to inside; the other of the two pressurizing pipes sequentially penetrates through the front air bag and the lower air bag from outside to inside and penetrates through the rear air bag; the grouting pipe penetrates through the front air bag and is clamped between the upper air bag and the lower air bag, and the method comprises the following steps: drilling, hole washing, grouting and hole sealing, and gas extraction. The invention can effectively improve the hole sealing effect.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and particularly relates to a flexible hole sealing system and method for a coal mine gas pre-extraction drill hole.
Background
Coal is the most important energy in China and always accounts for about 70% of primary energy production and consumption structures. However, because the occurrence conditions of coal beds are complex and changeable, coal beds containing gas are more, and the gas storage capacity of coal mines is large, the coal industry in China is threatened by various natural disasters for a long time, and the safety production and sustainable development of mines are seriously influenced. Gas disasters are one of the most serious disasters in the coal mining process. According to the statistics in 2006, in 609 mines of 100 national key coal production enterprises, a high gas mine accounts for 26.8%, a coal and gas outburst mine accounts for 17.6%, and a low gas mine accounts for 55.6%. With the increasing of the mining depth, the gas emission quantity is increased continuously, the coal and gas outburst danger is increased continuously, and the number of high gas mines is increased.
At present, the fundamental method for preventing and treating coal mine gas disasters in China is to extract gas. From the beginning of the 50 s in the 20 th century, gas extraction is popularized in high-gas mines in China as an important measure for controlling coal mine gas disasters. Coal mine safety regulations also set forth a detailed specification for coal mine gas extraction in the form of regulations. In order to ensure the safe and efficient gas extraction, the effective sealing of the gas extraction drill hole becomes the key of the gas extraction. .
In the 80 s of the 20 th century, Zhou Shi Ning academy proposed an active pressure measurement method, whose basic principle is "solid sealing liquid, liquid seal gas", i.e. liquid is used as a hole sealing substance to solve the problem that solid matter can not tightly seal the cracks around the drilled hole, and according to the principle that fluid permeation depends on pressure difference, the pressure of the sealing liquid is always slightly higher than that of gas in the whole sealing process to prevent gas leakage. In order to maintain the pressure of the sealing liquid and effectively prevent hole collapse of the sealed hole section, high-strength cement-based materials are used for sealing at two ends of the sealing liquid section, and the hole wall is solidified, while the sealing liquid is made of a flexible weak-strength material, so that a sealing system for sealing liquid by solid and gas by liquid is formed.
However, at present, the mining cement slurry is commonly used for grouting and sealing, including other grouting and sealing modes, when slurry is solidified, a new crack evolved in the extraction process cannot be sealed, the adoption of solidification and sealing means that a sealing device cannot be recycled, sealing materials and a large number of pipelines are left in holes, a large number of sealing devices are basically used at one time, and material consumption is huge. For coal mines, the operation of single gas pre-pumping needs a great amount of manpower and material resources to be invested every year.
Disclosure of Invention
The invention aims to solve the technical problem of providing a flexible hole sealing system for a coal mine gas pre-extraction drill hole, which has the advantages of novel and reasonable design, simple structure, convenient realization and better hole sealing effect, aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a flexible hole sealing system of colliery gas pre-extraction drilling which characterized in that: the hole sealing mechanism comprises an extraction pipe, a grouting pipe and two pressurizing pipes which are arranged in a gas pre-extraction drilling space side by side, the gas pre-extraction drilling space takes one end of gas extraction as an inner end, the other end of the gas pre-extraction drilling space as an outer end, a front air bag, a middle air bag and a rear air bag are sequentially arranged in the gas pre-extraction drilling space from outside to inside, the middle air bag consists of an upper air bag and a lower air bag which are symmetrically arranged from top to bottom, the extraction pipe penetrates through the front air bag and the rear air bag and is clamped between the upper air bag and the lower air bag of the middle air bag, and one of the two pressurizing pipes sequentially penetrates through the front air bag and the upper air bag forming the middle air bag from outside to inside and penetrates through the rear air bag; the other one of the two pressurizing pipes sequentially penetrates through the front air bag and the lower air bag forming the middle air bag from outside to inside and penetrates through the rear air bag; the upper air bag is provided with a plurality of first buckles, the upper air bag is fixedly connected to the extraction pipe, the grouting pipe and the pressurizing pipe penetrating through the upper air bag through the first buckles, and the upper air bag is divided into a plurality of upper sub air bags; the lower air bag is provided with a plurality of second buckles which have the same positions as the first buckles for fixing the upper air bag, the second buckles fixedly connect the lower air bag to the extraction pipe, the grouting pipe and the pressurizing pipe penetrating through the lower air bag, and the lower air bag is divided into a plurality of lower sub air bags; the parts of one pressurizing pipe penetrating through the upper air bag, which are positioned in the front air bag, the plurality of upper sub air bags in the upper air bag and the rear air bag, are all provided with air holes, the parts of one pressurizing pipe penetrating through the lower air bag, which are positioned in the front air bag, the plurality of lower sub air bags in the lower air bag and the rear air bag, are all provided with air holes, and the air holes are connected with vent valves; the grouting pipe penetrates through the front air bag and is clamped between the upper air bag and the lower air bag of the middle air bag, grouting slurry outlets are arranged on the grouting pipes positioned between the front air bag and the middle air bag, between the rear air bag and the middle air bag and between two adjacent upper sub air bags, and grouting valves are connected to the grouting slurry outlets;
the two ends of the front air bag are respectively provided with a third buckle for sealing the front air bag, and the third buckles fixedly connect the two ends of the front air bag to the extraction pipe, the grouting pipe and the two pressurizing pipes; a fourth buckle is arranged at one end, close to the middle air bag, of the rear air bag, the end, close to the middle air bag, of the rear air bag is fixedly connected to the extraction pipe and the two pressurizing pipes through the fourth buckle, a fifth buckle is arranged at one end, far away from the middle air bag, of the rear air bag, and the end, far away from the middle air bag, of the rear air bag is fixedly connected to the extraction pipe through the fifth buckle;
the gas extraction mechanism is connected with an extraction pipe, and the grouting mechanism is connected with a grouting pipe.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the grouting valve is a one-way valve.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the extraction pipe, the grouting pipe and the two pressurizing pipes are fixedly connected.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the end part of the gas extracted by the extraction pipe is provided with a perforated pipe.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the gas extraction mechanism comprises a gas conveying pipe connected with an extraction pipe and a gas storage tank connected with the gas conveying pipe, and a gas extraction pump, a gas extraction valve and a gas pressure gauge are sequentially connected to the gas conveying pipe from the direction of connecting the gas storage tank to the direction of connecting the extraction pipe.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: slip casting mechanism include with slip casting thick liquid conveyer pipe of slip casting union coupling and the thick liquid storage jar with slip casting thick liquid conveyer pipe connection, slip casting thick liquid conveyer pipe is last to have connected gradually slip casting pump, slip casting valve and slip casting manometer from connecting the thick liquid storage jar to slip casting pipe direction.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the gas pre-pumping drilling device is characterized in that the pressurizing pipe is connected with a pressurizing device at the outer end of a gas pre-pumping drilling space, the pressurizing device comprises a gas conveying pipe and a gas pump, the pressurizing pipe is connected with one end of the gas conveying pipe, the other end of the gas conveying pipe is connected with the gas pump, and a pressurizing pipe valve and an inflation pressure gauge are sequentially connected to the gas conveying pipe from the connection of the gas pump to the connection of the pressurizing pipe.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the diameters of the upper sub air bag and the lower sub air bag are both smaller than the radius of the gas pre-drainage drilling hole space.
Foretell flexible hole sealing system of colliery gas pre-extraction drilling, its characterized in that: the upper sub air bag, the lower sub air bag, the front air bag and the rear air bag are all formed by inflatable tubes, and the wall thickness of the inflatable tubes forming the upper sub air bag and the lower sub air bag is larger than that of the inflatable tubes forming the front air bag and the rear air bag. The invention also discloses a method which has simple steps, is convenient to realize and can improve the hole sealing effect, and is characterized by comprising the following steps:
step one, drilling: drilling a hole in the roadway by using a drilling machine to form a gas pre-drainage drilling space, and cleaning drill cuttings in the gas pre-drainage drilling space;
step two, hole washing: flushing the gas pre-drainage drilling hole space for at least 20min by using high-pressure water flow, and flushing out water accumulated in the gas pre-drainage drilling hole space by using high-pressure air;
step three, grouting and sealing holes, which comprises the following specific processes:
step 301, connecting a hole sealing mechanism: adjusting the positions of the front air bag, the middle air bag and the rear air bag relative to the extraction pipe, connecting a ventilation valve to the two pressurization pipes, connecting a grouting valve to the grouting pipe, fixedly connecting the front air bag to the extraction pipe, the grouting pipe and the two pressurization pipes through a third buckle, fixedly connecting one end of the rear air bag close to the middle air bag to the extraction pipe and the two pressurization pipes through a fourth buckle, and fixedly connecting one end of the rear air bag far away from the middle air bag to the extraction pipe through a fifth buckle; fixedly connecting the upper air bag to an extraction pipe, a grouting pipe and a pressurizing pipe penetrating through the upper air bag through a plurality of first buckles, and dividing the upper air bag into a plurality of upper sub air bags; fixedly connecting the lower air bag to an extraction pipe, a grouting pipe and a pressurizing pipe penetrating through the lower air bag through a plurality of second buckles, and dividing the lower air bag into a plurality of lower sub air bags; fixedly connecting an extraction pipe, a grouting pipe and two pressurizing pipes;
step 302, integrally extending the hole sealing mechanism connected in the step 301 into a gas pre-drainage drilling hole space, and adjusting the hole sealing mechanism to a preset grouting hole sealing position;
step 303, grouting and hole sealing: firstly, connecting an extraction pipe with a gas conveying pipe through a quick connector, connecting a grouting pipe with a grouting slurry conveying pipe through a quick connector, and connecting a pressurizing pipe with a gas conveying pipe through a quick connector; then closing the grouting valve and the gas extraction valve, opening the pressurizing pipe valve, starting the air pump, stopping pressurizing when the reading of the inflation pressure gauge reaches 0.3MPa, and closing the pressurizing pipe valve; opening a grouting valve, starting a grouting pump, enabling grouting slurry in a slurry storage tank to enter a grouting pipe through a grouting slurry conveying pipe, enabling the grouting slurry to break through the grouting valve when the grouting pressure in the grouting pipe reaches 0.2MPa, enabling the grouting slurry to flow into a grouting area, stopping grouting when the reading of a grouting pressure gauge reaches 0.3MPa, and closing the grouting valve; opening the pressurizing pipe valve, starting the air pump, stopping pressurizing when the reading of the inflation pressure gauge reaches 1MPa, and closing the pressurizing pipe valve;
step four, gas extraction: and opening a gas extraction valve, starting a gas extraction pump, conveying extracted gas to a gas storage tank through a gas conveying pipe, and displaying the gas pressure at an extraction position by a gas pressure gauge.
Compared with the prior art, the invention has the following advantages:
1. according to the flexible hole sealing system for the coal mine gas pre-drainage drill hole, the front air bag and the rear air bag are made of flexible materials, and the problems of single plug and poor sealing effect are solved by adopting the flexible materials to plug the plug.
2. According to the flexible hole sealing system for the coal mine gas pre-extraction drill hole, the middle air bag consists of an upper air bag and a lower air bag which are symmetrically arranged one above the other, a plurality of first buckles are arranged on the upper air bag, the upper air bag is fixedly connected to an extraction pipe, a grouting pipe and a pressurizing pipe penetrating through the upper air bag through the first buckles, and the upper air bag is divided into a plurality of upper sub air bags; the lower air bag is provided with a plurality of second buckles which have the same positions as the first buckles for fixing the upper air bag, the lower air bag is fixedly connected to the extraction pipe, the grouting pipe and the pressurizing pipe penetrating through the lower air bag through the second buckles, and the lower air bag is divided into a plurality of lower sub air bags; the formed upper sub air bag and the lower sub air bag solve the problem that the hole sealing effect is not ideal due to the single form of the air bag, occupy the volume of a hole sealing part, reduce the using amount of grouting slurry in the hole sealing process, reduce the cost and protect the environment.
3. The flexible hole sealing system for the coal mine gas pre-drainage drill hole can adjust the lengths of the front air bag, the middle air bag and the rear air bag according to different coal beds, different crack development and different drilling depths, and is suitable for various hole sealing operations.
4. According to the flexible hole sealing system for the coal mine gas pre-extraction drill hole, the front air bag, the middle air bag and the rear air bag are made of flexible materials, the flexible materials can accept deformation of the drill hole in a large range, a new crack can be generated in the extraction process, the elastic potential energy of the air bags can promote the slurry to continuously permeate, the new crack is filled, and a good sealing effect is kept; if the pressure in the front air bag, the middle air bag and the rear air bag is reduced, the system can be timely and repeatedly pressurized.
5. In the specific implementation process, on the premise of ensuring the effective hole sealing effect, the capsule type plugging process commonly used in a mining area is basically not changed, and the construction strength and the extra workload are not increased too much.
6. The method is convenient to implement in a well with limited space, the pressure in the hole is moderate after grouting and plugging, obvious disturbance to the stress of the deep hole edge is basically avoided, and the borehole instability caused by hole plugging is avoided.
In conclusion, the method is simple to implement, effectively improves the hole sealing effect, is suitable for gas extraction operation of most mining areas, and is easy to popularize.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic view of the connection relationship of a gas extraction mechanism, a grouting mechanism and a hole sealing mechanism.
FIG. 2 is a schematic view of a hole sealing portion of the hole sealing mechanism of the present invention.
FIG. 3 is a partially enlarged view of the hole sealing mechanism according to the present invention.
FIG. 4 is a sectional view of the intermediate air bag of the present invention in a state where it is not pressurized by grouting.
FIG. 5 is a sectional view of the intermediate air bag in a pressurized state.
FIG. 6 is a cross-sectional view of the rear airbag of the present invention in a pressurized state.
Description of reference numerals:
1-front air bag; 2-rear air bag; 3, pumping out a pipe;
4-a pressure pipe; 5, grouting pipes; 6-grouting valve;
7-a vent valve; 8, gas pre-pumping a drilling space; 9-grouting area;
10-a slurry penetration zone; 11-intermediate air bag; 11-1-upper sub-balloon;
11-2-inferior air sac; 12-floral tube; 13-a coal body;
14-gas extraction pump; 15-gas delivery pipe; 16-a gas storage tank;
17-gas pressure gauge; 18-gas extraction valve; 19-pressure pipe valve;
20-inflation pressure gauge; 21-an air pump; 22-gas delivery pipe;
23-grouting valve; 24-grouting pump; 25-slurry storage tank;
26-grouting pressure gauge; 27-grouting slurry conveying pipe; 28-a first buckle;
29-a second fastener; 30-a third buckle; 31-a fourth buckle;
32-fifth snap.
Detailed Description
The invention discloses a flexible hole sealing system for a coal mine gas pre-extraction borehole, which comprises a hole sealing mechanism, a gas extraction mechanism and a grouting mechanism as shown in figures 1, 2, 3, 4, 5 and 6, the hole sealing mechanism comprises an extraction pipe 3, a grouting pipe 5 and two pressurizing pipes 4 which are arranged in the gas pre-extraction drilling space 8 side by side, the gas pre-drainage borehole space 8 takes one end of gas drainage as an inner end and the other end as an outer end, a front air bag 1, a middle air bag 11 and a rear air bag 2 are sequentially arranged in the gas pre-drainage borehole space 8 from outside to inside, the middle air bag 11 consists of an upper air bag and a lower air bag which are symmetrically arranged up and down, the extraction pipe 3 passes through the front air bag 1 and the rear air bag 2, and is clamped between the upper air bag and the lower air bag of the middle air bag 11, one of the two pressurizing pipes 4 sequentially penetrates through the front air bag 1 and the upper air bag forming the middle air bag 11 from outside to inside and penetrates through the rear air bag 2; the other one of the two pressurizing pipes 4 sequentially penetrates through the front air bag 1 and the lower air bag forming the middle air bag 11 from outside to inside and penetrates through the rear air bag 2; the upper air bag is provided with a plurality of first buckles 28, the upper air bag is fixedly connected to the extraction pipe 3, the grouting pipe 5 and the pressurizing pipe 4 penetrating through the upper air bag through the first buckles 28, and the upper air bag is divided into a plurality of upper sub air bags 11-1; the lower air bag is provided with a plurality of second buckles 29 which have the same positions as the first buckles 28 for fixing the upper air bag, the lower air bag is fixedly connected to the extraction pipe 3, the grouting pipe 5 and the pressurizing pipe 4 penetrating through the lower air bag through the second buckles 29, and the lower air bag is divided into a plurality of lower sub air bags 11-2; the parts of one pressurizing pipe 4 penetrating through the upper air bag, which are positioned in the front air bag 1, the plurality of upper sub air bags 11-1 in the upper air bag and the rear air bag 2, are all provided with air holes, the parts of one pressurizing pipe 4 penetrating through the lower air bag, which are positioned in the front air bag 1, the plurality of lower sub air bags 11-2 in the lower air bag and the rear air bag 2, are all provided with air holes, and the air holes are connected with a vent valve 7; the grouting pipe 5 penetrates through the front air bag 1 and is clamped between the upper air bag and the lower air bag of the middle air bag 11, grouting slurry outlets are arranged on the grouting pipes 5 positioned between the front air bag 1 and the middle air bag 11, between the rear air bag 2 and the middle air bag 11 and between two adjacent upper sub air bags 11-1, and a grouting valve 6 is connected to each grouting slurry outlet;
the two ends of the front air bag 1 are respectively provided with a third buckle 30 for sealing the front air bag 1, and the third buckles 30 fixedly connect the two ends of the front air bag 1 to the extraction pipe 3, the grouting pipe 5 and the two pressurizing pipes 4; a fourth buckle 31 is arranged at one end, close to the middle air bag 11, of the rear air bag 2, the end, close to the middle air bag 11, of the rear air bag 2 is fixedly connected to the extraction pipe 3 and the two pressurizing pipes 4 through the fourth buckle 31, a fifth buckle 32 is arranged at one end, far away from the middle air bag 11, of the rear air bag 2, and the end, far away from the middle air bag 11, of the rear air bag 2 is fixedly connected to the extraction pipe 3 through the fifth buckle 32; the gas extraction mechanism is connected with an extraction pipe 3, and the grouting mechanism is connected with a grouting pipe 5; when the method is specifically implemented, the lengths of the front air bag 1, the middle air bag 11 and the rear air bag 2 can be changed according to the depth of a drilled hole, and the method is suitable for various hole sealing operations.
In this embodiment, as shown in fig. 2 and 3, the grouting valve 6 is a check valve.
In the embodiment, as shown in fig. 2 and 3, the extraction pipe 3, the grouting pipe 5 and the two pressurizing pipes 4 are fixedly connected.
In this embodiment, as shown in fig. 2, a perforated pipe 12 is arranged at an end of the gas extracted by the extraction pipe 3.
In this embodiment, as shown in fig. 1, the gas extraction mechanism includes a gas delivery pipe 15 connected to the extraction pipe 3 and a gas storage tank 16 connected to the gas delivery pipe 15, and a gas extraction pump 14, a gas extraction valve 18, and a gas pressure gauge 17 are sequentially connected to the gas delivery pipe 15 from the connection of the gas storage tank 16 to the connection of the extraction pipe 3.
In this embodiment, as shown in fig. 1, the grouting mechanism includes a grouting slurry delivery pipe 27 connected to the grouting pipe 5 and a slurry storage tank 25 connected to the grouting slurry delivery pipe 27, and a grouting pump 24, a grouting valve 23 and a grouting pressure gauge 26 are sequentially connected to the grouting slurry delivery pipe 27 from the connecting slurry storage tank 25 to the grouting pipe 5.
In this embodiment, as shown in fig. 1, the pressure pipe 4 is connected with a pressure device at the outer end of the gas pre-drainage borehole space 8, the pressure device includes a gas delivery pipe 22 and an air pump 21, the pressure pipe 4 is connected with one end of the gas delivery pipe 22, the other end of the gas delivery pipe 22 is connected with the air pump 21, and the pressure pipe valve 19 and an inflation pressure gauge 20 are sequentially connected on the gas delivery pipe 22 from the connection of the air pump 21 to the connection of the pressure pipe 4.
In this embodiment, as shown in fig. 4, the diameters of the upper sub-airbag 11-1 and the lower sub-airbag 11-2 are both smaller than the radius of the gas pre-drainage borehole space 8, so as to provide necessary conditions for grouting slurry to enter the grouting area 9.
In this embodiment, the upper sub airbag 11-1, the lower sub airbag 11-2, the front airbag 1, and the rear airbag 2 are all formed by inflatable tubes, and the wall thickness of the inflatable tubes forming the upper sub airbag 11-1 and the lower sub airbag 11-2 is greater than the wall thickness of the inflatable tubes forming the front airbag 1 and the rear airbag 2; under the pressure of 0.3MPa, the expansion degree of the front air bag 1 and the rear air bag 2 is greater than that of the middle air bag 11, the front air bag 1 and the rear air bag 2 firstly expand to plug two ends of a grouting hole sealing section, and the middle air bag 11 is in an inflated full state but does not expand; when the pressure reaches 1MPa, the intermediate bladder 11 is also in an inflated deformed state, pressing the slurry into the slurry penetration zone 10.
In this embodiment, as shown in fig. 1 and 2, the method for performing flexible hole sealing for coal mine gas extraction by the system includes the following steps:
step one, drilling: drilling a hole in the roadway by using a drilling machine to form a gas pre-pumping drilling hole space 8, and cleaning drill cuttings in the gas pre-pumping drilling hole space 8; in specific implementation, a stable gas pre-drainage drilling hole space 8 is ensured to be formed, and the phenomenon of overlarge deformation or collapse is avoided;
step two, hole washing: flushing the gas pre-drainage drilling space 8 for at least 20min by using high-pressure water flow, and flushing out water accumulated in the gas pre-drainage drilling space 8 by using high-pressure air; in specific implementation, the used drilling machine is a water drill, high-pressure water flow and high-pressure air are both provided by the drilling machine, the pressure of the high-pressure water flow is 8 kPa-15 kPa, and the pressure of the high-pressure air is 8 kPa-15 kPa; the clearance in gas pre-pump drilling hole space 8 is thorough, ensures that no drill chip exists in gas pre-pump drilling hole space 8, and when drill chip stops gasbag 1 and back gasbag 2 position in the front, can influence the end cap effect, leads to the slip casting thick liquid to spill over from slip casting hole sealing section, influences sealed effect.
Step three, grouting and sealing holes, which comprises the following specific processes:
step 301, connecting a hole sealing mechanism: adjusting the positions of the front air bag 1, the middle air bag 11 and the rear air bag 2 relative to the extraction pipe 3, connecting a vent valve 7 to the two pressurization pipes 4, connecting a grouting valve 6 to the grouting pipe 5, fixedly connecting the front air bag 1 to the extraction pipe 3, the grouting pipe 5 and the two pressurization pipes 4 through a third buckle 30, fixedly connecting one end of the rear air bag 2 close to the middle air bag 11 to the extraction pipe 3 and the two pressurization pipes 4 through a fourth buckle 31, and fixedly connecting one end of the rear air bag 2 far away from the middle air bag 11 to the extraction pipe 3 through a fifth buckle 32; fixedly connecting the upper air bag to the extraction pipe 3, the grouting pipe 5 and the pressurizing pipe 4 penetrating through the upper air bag through a plurality of first buckles 28, and dividing the upper air bag into a plurality of upper sub air bags 11-1; the lower air bag is fixedly connected to the extraction pipe 3, the grouting pipe 5 and the pressurizing pipe 4 penetrating through the lower air bag through a plurality of second buckles 29, and the lower air bag is divided into a plurality of lower sub air bags 11-2; fixedly connecting an extraction pipe 3, a grouting pipe 5 and two pressurizing pipes 4; in specific implementation, the sealing work of the front air bag 1, the middle air bag 11 and the rear air bag 2 is well done, so that the phenomenon of air leakage cannot occur in the whole hole sealing process; the fixed connection part of the buckle is well fixed, so that looseness is prevented in the whole hole sealing process;
step 302, integrally extending the hole sealing mechanism connected in the step 301 into the gas pre-drainage drilling hole space 8, and adjusting the hole sealing mechanism to a preset grouting hole sealing position; in specific implementation, before the hole sealing mechanism extends into the gas pre-drainage drilling hole space 8, the grouting valve 6 and the vent valve 7 are ensured to be normally opened, so that the dislocation during pressurization and grouting is avoided;
step 303, grouting and hole sealing: firstly, connecting an extraction pipe 3 with a gas conveying pipe 15 through a quick joint, connecting a grouting pipe 5 with a grouting slurry conveying pipe 27 through a quick joint, and connecting a pressurizing pipe 4 with a gas conveying pipe 22 through a quick joint; then closing the grouting valve 23 and the gas extraction valve 18, opening the pressurization pipe valve 19, starting the air pump 21, stopping pressurization when the reading of the inflation pressure gauge 20 reaches 0.3MPa, and closing the pressurization pipe valve 19; opening a grouting valve 23, starting a grouting pump 24, enabling grouting slurry in a slurry storage tank 25 to enter a grouting pipe 5 through a grouting slurry conveying pipe 27, when the grouting pressure in the grouting pipe 5 reaches 0.2MPa, enabling the grouting slurry to break through a grouting valve 6, enabling the grouting slurry to flow into a grouting area 9, and when the indication of a grouting pressure gauge 26 reaches 0.3MPa, stopping grouting and closing the grouting valve 23; then the pressurizing pipe valve 19 is opened, the air pump 21 is started, when the reading of the inflation pressure gauge 20 reaches 1MPa, the pressurization is stopped, and the pressurizing is closedA pinch valve 19; during specific implementation, before pressurization, the front air bag 1, the middle air bag 11 and the rear air bag 2 are ensured to be not damaged and can be normally opened, the pressurization pipe valve 19 is in an open state, and the gas extraction valve 18 and the grouting valve 23 are in a closed state, so that the whole pipeline is ensured not to leak gas; a sufficient amount of prepared grouting slurry is filled in the slurry storage tank 25, so that the grouting slurry is kept uniform before grouting; because the middle air bag 11 is thicker than the front air bag 1 and the rear air bag 2, when the pressure is increased to 0.3MPa for the first time, the front air bag 1 and the rear air bag 2 are rapidly expanded to block two ends, the front air bag 1 and the rear air bag 2 are ensured to be tightly attached to the hole wall, the sealing effect is ensured, the slurry leakage during grouting is prevented, at the moment, the middle air bag 11 is in a full-filled but non-expanded state, and a space is reserved for grouting slurry in the grouting area 9; when the pressure reaches 0.3MPa, the pressurization is stopped, the grouting is started, when the pressure in the grouting pipe 5 reaches 0.2MPa, the grouting slurry breaks through the grouting valve 6 and flows into the grouting area 9, when the pressure in the grouting area 9 reaches 0.3MPa, the grouting is stopped, and at the moment, the pressure in the front air bag 1, the middle air bag 11 and the rear air bag 2 is equal to the pressure in the grouting area 9; then the pressurizing pipe valve 19 and the air pump 21 are started, the pressurizing is stopped when the pressure of the inflatable pressure gauge 20 reaches 1MPa, the middle air bag 11 is also in an expansion deformation state at the moment, the space in the hole is limited, grouting slurry is extruded to enter the slurry permeation area 10, the crack area is effectively blocked, a good sealing effect is realized, and elastic potential energy is stored in the front air bag 1, the middle air bag 11 and the rear air bag 2 at the moment; the grouting slurry in the slurry storage tank 25 is made of Al (OH) which is relatively flexible3The colloid has the advantages of flame retardance, good stability, no toxicity, simple proportioning and low cost, and Al (OH)3The colloid is a colloid system with liquid property, can enter a drilling crack, expands a diffusion area, enhances the sealing property, and is a good hole sealing material.
Step four, gas extraction: opening a gas extraction valve 18, starting a gas extraction pump 14, conveying extracted gas to a gas storage tank 16 through a gas conveying pipe 15, and displaying the gas pressure at an extraction position by a gas pressure gauge 17; in the extraction process, the gas content in the hole is gradually reduced, new cracks are formed in the coal body 13 under the action of mine pressure, the cracks in the hole are gradually exposed, at the moment, the elastic potential energy of the front air bag 1, the middle air bag 11 and the rear air bag 2 is gradually released, the volume is expanded, grouting slurry is slowly pressed into the newly formed cracks, new balance is achieved after a period of time, and active dynamic sealing is achieved; the pressure displayed by the inflatable pressure gauge 20 is observed in the extraction process, and when the pressures in the front air bag 1, the middle air bag 11 and the rear air bag 2 are reduced, the air bags can be pressurized at any time, so that a good sealing effect is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a flexible hole sealing system of colliery gas pre-extraction drilling which characterized in that: comprises a hole sealing mechanism, a gas extraction mechanism and a grouting mechanism, wherein the hole sealing mechanism comprises an extraction pipe (3), a grouting pipe (5) and two pressurizing pipes (4) which are arranged in a gas pre-extraction drilling space (8) side by side, the gas pre-pumping drilling space (8) takes one end of gas extraction as an inner end and the other end as an outer end, a front air bag (1), a middle air bag (11) and a rear air bag (2) are sequentially arranged in the gas pre-pumping drilling hole space (8) from outside to inside, the middle air bag (11) consists of an upper air bag and a lower air bag which are symmetrically arranged up and down, the extraction pipe (3) passes through the front air bag (1) and the rear air bag (2), and is clamped between an upper air bag and a lower air bag of the middle air bag (11), one of the two pressurizing pipes (4) sequentially penetrates through the front air bag (1) and the upper air bag forming the middle air bag (11) from outside to inside and penetrates through the rear air bag (2); the other one of the two pressurizing pipes (4) sequentially penetrates through the front air bag (1) and the lower air bag forming the middle air bag (11) from outside to inside and penetrates through the rear air bag (2); the upper air bag is provided with a plurality of first buckles (28), the upper air bag is fixedly connected to the extraction pipe (3), the grouting pipe (5) and the pressurizing pipe (4) penetrating through the upper air bag through the first buckles (28), and the upper air bag is divided into a plurality of upper sub air bags (11-1); the lower air bag is provided with a plurality of second buckles (29) which have the same positions as the first buckles (28) for fixing the upper air bag, the lower air bag is fixedly connected onto the extraction pipe (3), the grouting pipe (5) and the pressurizing pipe (4) penetrating through the lower air bag through the second buckles (29), and the lower air bag is divided into a plurality of lower sub air bags (11-2); air holes are formed in the parts, located in the front air bag (1), the upper sub air bags (11-1) and the rear air bag (2) in the upper air bag, of one pressurizing pipe (4) penetrating through the upper air bag, air holes are formed in the parts, located in the front air bag (1), the lower sub air bags (11-2) and the rear air bag (2), of one pressurizing pipe (4) penetrating through the lower air bag, of the lower air bag, and vent valves (7) are connected to the air holes; the grouting pipe (5) penetrates through the front air bag (1) and is clamped between the upper air bag and the lower air bag of the middle air bag (11), grouting slurry outlets are arranged on the grouting pipe (5) positioned between the front air bag (1) and the middle air bag (11), between the rear air bag (2) and the middle air bag (11) and between two adjacent upper sub air bags (11-1), and a grouting valve (6) is connected to each grouting slurry outlet;
the two ends of the front air bag (1) are respectively provided with a third buckle (30) used for sealing the front air bag (1), and the third buckles (30) fixedly connect the two ends of the front air bag (1) to the extraction pipe (3), the grouting pipe (5) and the two pressurizing pipes (4); a fourth buckle (31) is arranged at one end, close to the middle air bag (11), of the rear air bag (2), one end, close to the middle air bag (11), of the rear air bag (2) is fixedly connected to the extraction pipe (3) and the two pressurizing pipes (4) through the fourth buckle (31), a fifth buckle (32) is arranged at one end, far away from the middle air bag (11), of the rear air bag (2), and the end, far away from the middle air bag (11), of the rear air bag (2) is fixedly connected to the extraction pipe (3) through the fifth buckle (32);
the gas extraction mechanism is connected with the extraction pipe (3), and the grouting mechanism is connected with the grouting pipe (5);
the gas extraction mechanism comprises a gas conveying pipe (15) connected with the extraction pipe (3) and a gas storage tank (16) connected with the gas conveying pipe (15), and a gas extraction pump (14), a gas extraction valve (18) and a gas pressure gauge (17) are sequentially connected to the gas conveying pipe (15) from the direction from the connection of the gas storage tank (16) to the connection of the extraction pipe (3);
the grouting mechanism comprises a grouting slurry conveying pipe (27) connected with the grouting pipe (5) and a slurry storage tank (25) connected with the grouting slurry conveying pipe (27), wherein a grouting pump (24), a grouting valve (23) and a grouting pressure gauge (26) are sequentially connected to the grouting slurry conveying pipe (27) from the connecting slurry storage tank (25) to the grouting pipe (5);
the utility model discloses a gas pressure pipe, including gas delivery pipe (22), gas delivery pipe (22) and gas pump (20), pressurization pipe (4) are connected with gas delivery pipe (22) one end in advance, the gas delivery pipe (22) other end is connected with gas pump (21), gas delivery pipe (22) are gone up and are connected in proper order pressurization pipe valve (19) and inflatable pressure gauge (20) from connecting gas pump (21) to connecting pressurization pipe (4) orientation.
2. The coal mine gas pre-drainage borehole flexible sealing system according to claim 1, characterized in that: the grouting valve (6) is a one-way valve.
3. The coal mine gas pre-drainage borehole flexible sealing system according to claim 1, characterized in that: the extraction pipe (3), the grouting pipe (5) and the two pressurizing pipes (4) are fixedly connected.
4. The coal mine gas pre-drainage borehole flexible sealing system according to claim 1, characterized in that: the end part of the gas extracted by the extraction pipe (3) is provided with a perforated pipe (12).
5. The coal mine gas pre-drainage borehole flexible sealing system according to claim 1, characterized in that: the diameters of the upper sub air bag (11-1) and the lower sub air bag (11-2) are both smaller than the radius of the gas pre-drainage drilling hole space (8).
6. The coal mine gas pre-drainage borehole flexible sealing system according to claim 1, characterized in that: the upper sub air bag (11-1), the lower sub air bag (11-2), the front air bag (1) and the rear air bag (2) are all formed by inflatable tubes, and the wall thickness of the inflatable tubes forming the upper sub air bag (11-1) and the lower sub air bag (11-2) is larger than that of the inflatable tubes forming the front air bag (1) and the rear air bag (2).
7. The method for flexibly sealing coal mine gas extraction by using the system of claim 1 is characterized by comprising the following steps:
step one, drilling: drilling a hole in the roadway by using a drilling machine to form a gas pre-drainage drilling space (8), and cleaning drill cuttings in the gas pre-drainage drilling space (8);
step two, hole washing: flushing the gas pre-drainage drilling hole space (8) for at least 20min by using high-pressure water flow, and flushing out water accumulated in the gas pre-drainage drilling hole space (8) by using high-pressure air;
step three, grouting and sealing holes, which comprises the following specific processes:
step 301, connecting a hole sealing mechanism: the positions of the front air bag (1), the middle air bag (11) and the rear air bag (2) relative to the extraction pipe (3) are adjusted, a vent valve (7) is connected to the two pressurization pipes (4), a grouting valve (6) is connected to the grouting pipe (5), the front air bag (1) is fixedly connected to the extraction pipe (3), the grouting pipe (5) and the two pressurization pipes (4) through a third buckle (30), one end, close to the middle air bag (11), of the rear air bag (2) is fixedly connected to the extraction pipe (3) and the two pressurization pipes (4) through a fourth buckle (31), and one end, far away from the middle air bag (11), of the rear air bag (2) is fixedly connected to the extraction pipe (3) through a fifth buckle (32); the upper air bag is fixedly connected to the extraction pipe (3), the grouting pipe (5) and the pressurizing pipe (4) penetrating through the upper air bag through a plurality of first buckles (28), and the upper air bag is divided into a plurality of upper sub air bags (11-1); the lower air bag is fixedly connected to the extraction pipe (3), the grouting pipe (5) and the pressurizing pipe (4) penetrating through the lower air bag through a plurality of second buckles (29), and the lower air bag is divided into a plurality of lower sub air bags (11-2); fixedly connecting an extraction pipe (3), a grouting pipe (5) and two pressurizing pipes (4);
step 302, integrally extending the hole sealing mechanism connected in the step 301 into the gas pre-drainage drilling hole space (8), and adjusting the hole sealing mechanism to a preset grouting hole sealing position;
step 303, grouting and hole sealing: firstly, connecting an extraction pipe (3) with a gas conveying pipe (15) through a quick joint, connecting a grouting pipe (5) with a grouting slurry conveying pipe (27) through the quick joint, and connecting a pressurizing pipe (4) with a gas conveying pipe (22) through the quick joint; then closing a grouting valve (23) and a gas extraction valve (18), opening a pressurizing pipe valve (19), starting an air pump (21), stopping pressurizing when the reading of an air inflation pressure gauge (20) reaches 0.3MPa, and closing the pressurizing pipe valve (19); opening a grouting valve (23), starting a grouting pump (24), enabling grouting slurry in a slurry storage tank (25) to enter a grouting pipe (5) through a grouting slurry conveying pipe (27), enabling the grouting slurry to break through a grouting valve (6) when the grouting pressure in the grouting pipe (5) reaches 0.2MPa, enabling the grouting slurry to flow into a grouting area (9), stopping grouting when the indication of a grouting pressure gauge (26) reaches 0.3MPa, and closing the grouting valve (23); then opening the pressurizing pipe valve (19), starting the air pump (21), stopping pressurizing when the reading of the air-charging pressure gauge (20) reaches 1MPa, and closing the pressurizing pipe valve (19);
step four, gas extraction: and opening a gas extraction valve (18), starting a gas extraction pump (14), conveying extracted gas to a gas storage tank (16) through a gas conveying pipe (15), and displaying the gas pressure at the extraction position by a gas pressure gauge (17).
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| CN110056383B (en) * | 2019-05-05 | 2024-08-27 | 天地科技股份有限公司 | Flexible side protection device of hydraulic support |
| CN110778308B (en) * | 2019-11-04 | 2024-09-17 | 中铁二十三局集团第三工程有限公司 | Device and method for testing gas flow while drilling |
| CN111636847B (en) * | 2020-05-14 | 2022-06-10 | 煤科集团沈阳研究院有限公司 | Directional leading-in device of colliery gas drainage drilling hole sealing agent |
| CN111794711B (en) * | 2020-08-03 | 2023-08-08 | 河南理工大学 | High-pressure circulating grouting hole sealing device for gas extraction drilling and use method thereof |
| CN113187537B (en) * | 2021-05-31 | 2023-05-16 | 陕西陕煤铜川矿业有限公司 | Gas extraction drilling hole sealing device and method |
| CN118030171A (en) * | 2021-08-31 | 2024-05-14 | 中煤科工集团重庆研究院有限公司 | Hole sealing device |
| CN115929251B (en) * | 2022-12-05 | 2023-07-18 | 中国矿业大学(北京) | Underground recyclable dynamic liquid injection hole sealing device and construction method |
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| US4474409A (en) * | 1982-09-09 | 1984-10-02 | The United States Of America As Represented By The Secretary Of The Interior | Method of enhancing the removal of methane gas and associated fluids from mine boreholes |
| SU1252482A1 (en) * | 1984-11-29 | 1986-08-23 | Kramarenko Aleksandr | Flexible seal for blast holes and wells |
| CN103195388A (en) * | 2013-03-28 | 2013-07-10 | 郑州煤炭工业(集团)有限责任公司 | Two-plugging hole packer and plugging grouting method |
| CN103711515A (en) * | 2013-12-31 | 2014-04-09 | 河南能源化工集团研究院有限公司 | Reusable multistage gasbag mucus gas extraction drilling and hole sealing device |
| CN105041259B (en) * | 2015-06-25 | 2021-02-02 | 中国地质调查局水文地质环境地质调查中心 | Inflatable packer capable of passing through double cables and method |
| CN205532465U (en) * | 2016-02-01 | 2016-08-31 | 河南理工大学 | Slip casting hole packer is pressed in split type bag area |
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