CN109441526A - A kind of protected seam gas pumping method - Google Patents
A kind of protected seam gas pumping method Download PDFInfo
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- CN109441526A CN109441526A CN201910026749.6A CN201910026749A CN109441526A CN 109441526 A CN109441526 A CN 109441526A CN 201910026749 A CN201910026749 A CN 201910026749A CN 109441526 A CN109441526 A CN 109441526A
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- protected seam
- base plate
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- extraction
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005086 pumping Methods 0.000 title claims abstract description 26
- 238000000605 extraction Methods 0.000 claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 34
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011241 protective layer Substances 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 19
- 230000002265 prevention Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003715 interstitial flow Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a kind of protected seam gas pumping methods; the following steps are included: layer-through drilling of constructing in base plate tunnel, layer-through drilling passes through protected seam in protected seam construction of bottom plates base plate tunnel; the tripping in hole sealing tube in hole carries out extraction to protected seam gas；It is closed on base plate tunnel doorway using enclosing wall, extraction is carried out to the gas for entering protective layer by reserved methane gas extraction pipeline.Beneficial effects of the present invention: the gas drainage of protected seam, protective layer is realized; interim sealing of hole is carried out to drilling using hole sealing tube, closes and takes out; it can prevent gas overflowing in hole from causing tunnel gas exceeding limit; and efficiently solve traditional sealing of hole, close that stubble, aperture is limited in extraction technique, pipeline inner product water problems, evaded tunnel portion, side press cause pre-buried extraction pipeline to disconnect, ironware hits and produces pyrophoric hidden danger in pipeline and lane；Save drilling construction cost.
Description
Technical field
The present invention relates to a kind of coal mine gas drainage method more particularly to a kind of gas drainage sides of protected seam
Method.
Background technique
" prevention and treatment coal and gas prominent regulation " must take regional outburst prevention measures before requiring projecting coal bed adopt, and protective layer is opened
Technology is adopted as a kind of main regional outburst prevention measures, is directed to protective layer and two coal seams of protected seam.It is neighbouring to eliminate
The outburst danger in coal seam (protected seam) and the coal seam first exploited is known as protective layer；Due to protective coat extracted adopt movement use and it is same
When pumping and mining pressure relief mash gas, neighbouring dangerous seam with potential can be made to be changed into no dangerous seam with potential, the neighbouring outburst danger coal
Layer is known as protected seam.After protective coat extracted, protected seam obtains release antireflective effect, passes through the release to protected seam
Gas carries out extraction, can thoroughly eliminate the outburst hazard of protected seam.
According in December, 2009 China Mining University's mining and key lab, safety education portion qualification result, collection
Mine 13-1 coal is coal and gas prominent coal seam.It is required according to " prevention and treatment coal and gas prominent regulation ", predicted is outburst dangerous area
Coal seam, it is necessary to take region outburst prevention measures；Region outburst prevention measures should be preferentially using exploitation protective layer.
It opens Ji Kuang (central area) 13-1 coal to be in the warp damage of 11-2 coal mining influence, 11-2 coal lower protective layer is opened
After adopting, causes overlying rock to deform, destroy and be displaced.13-1 coal protected seam bends, is broken, and generates a large amount of hang down
Straight or oblique crack and crack in layer, gas from be diffused into inside coal body in external crack, from high pressure area interstitial flow to pressure
The low region of power.It analyzes through technology, economic comparison, is remotely unloaded using on 13-1 floor rock drivage+grid type to layer-through drilling
Platen press pumping and mining pressure relief mash gas.
Use whole casing+" a two stifled notes " formula sealing of hole mode (see Fig. 1 to layer-through drilling the grid type constructed in the past on
(a)), and using 2 inch wired hoses by layer-through drilling close stubble to extraction main pipe (see Fig. 1 (b)).Under the sealing of hole, extraction mode,
Hole inner sleeve limits effective extraction aperture that drills, extraction main pipe ponding influences extraction, there are hidden danger for pre-buried pipeline in bottom plate lane, and
It is time-consuming, it is unable to satisfy mine stope at this stage and takes over needs.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of construction method tool solved in above-mentioned background technique
There is security risk, and protected seam gas pumping method the disadvantages of inefficiency.
The present invention is to solve above-mentioned technical problem by the following technical programs: the present invention discloses a kind of protected seam gas
Pumping method, comprising the following steps:
(1) in protected seam construction of bottom plates base plate tunnel, layer-through drilling of constructing in base plate tunnel, layer-through drilling is across quilt
Protective layer, the 2~4m sections of tripping in hole sealing tubes in layer-through drilling pore carry out extraction to protected seam gas by hole sealing tube；
(2) before protective layer working face extraction, one group of destressing borehole of every 20-40m construction, destressing borehole are worn in base plate tunnel
Protected seam is crossed, is closed on base plate tunnel doorway using enclosing wall, and methane gas extraction pipeline is installed on enclosing wall, gas
Extraction pipeline protrudes into 0-10 meters of base plate tunnel；
(3) back production is carried out to protective layer；
(4) during protective layer back production, the methane gas extraction pipeline set is stayed by base plate tunnel, to the gas pressure relief of protected seam
Carry out extraction.
The interim sealing of hole carried out to layer-through drilling, conjunction pumping may be implemented to by lower hole sealing tube in step (1), can prevent from wearing
Gas overflowing causes gas exceeding limit in base plate tunnel 3 in layer drilling；The naked pumping of step (2)-step (4), structure is simple, abandons existing
The problem of having the complicated procedures of forming in technology, also can solve drainage tube ponding in the prior art；
Preferably, it is fixed in the step (1) with hole sealing tube of the polyurethane to layer-through drilling aperture；Sealing of hole mode letter
Single, material easily obtains.
Preferably, the hole sealing tube in the step (1) is 2 cun of pvc pipes.
Preferably, the spacing of every group of destressing borehole is 20m in the step (2).
Preferably, every group of destressing borehole passes through 0.5 meter of protected seam in the step (2).
Preferably, enclosing wall is arranged within the scope of base plate tunnel doorway inward 5 meters in the step (2).
Preferably, methane gas extraction pipeline diameter is greater than or equal to Φ 426mm in the step (2).
Preferably, methane gas extraction pipeline described in the step (2) protrudes into 5-10 meters of base plate tunnel.
The present invention has the advantage that compared with prior art
(1) gas pre-drainage that protected seam may be implemented in the base plate tunnel in the present invention adopts the gas drainage with protective layer,
In the step (1) using " naked envelope " by the way of, abandoned on the grid type of previous construction to layer-through drilling using whole process casing+
" two stifled a note " formula sealing of hole mode, the gas of protected seam can enter base plate tunnel along layer-through drilling, to layer-through drilling into
Capable interim sealing of hole is closed and is taken out, and can prevent gas overflowing in layer-through drilling from causing gas exceeding limit in base plate tunnel；In step (2)
It by the way of " naked pumping ", abandons the cumbersome sealing of hole of former layer-through drilling, close stubble mode, directly adopt pressure release drilling and carry out naked pumping,
It efficiently solves traditional sealing of hole, close that stubble, aperture is limited in extraction technique, pipeline inner product water problems, evaded tunnel portion, side to press
Pre-buried extraction pipeline is caused to disconnect, ironware hits and produces pyrophoric hidden danger in pipeline and lane；
(2) drilling construction cost is saved, inessential sealing material, gas pipeline expense investment are reduced；
(3) drilling construction efficiency is improved, drilling construction process is simplified using drilling " naked envelope " technology.
Detailed description of the invention
Fig. 1 (a) is sealing of hole pattern diagram in the prior art；
Fig. 1 (b) is destressing borehole extraction schematic diagram in the prior art；
Fig. 2 is sealing of hole schematic diagram in a kind of protected seam gas pumping method of the embodiment of the present invention；
Fig. 3 is destressing borehole extraction schematic diagram in a kind of protected seam gas pumping method of the embodiment of the present invention.
Figure label: base plate tunnel 3, layer-through drilling 31, pressure release drilling 32, polyurethane 4, hole sealing tube 5, enclosing wall 6, gas
Extraction pipeline 7, Grouting Pipe 8,81,2 cun of slurry recovering tube dual anti-real pipes 82,2 small weapon pipes 83, wired hose 84, extraction pipeline 85.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment one:
As Figure 2-3, the present embodiment present invention discloses a kind of protected seam gas pumping method, comprising the following steps:
(1) in protected seam construction of bottom plates base plate tunnel 3, layer-through drilling 31 of constructing in base plate tunnel 3, layer-through drilling 31
Can be multiple groups, multiple, layer-through drilling 31 passes through protected seam, and the aperture of layer-through drilling 31 is sealed, hole sealing tube 5 is reserved,
Hole sealing tube 5 is connected to layer-through drilling 31 and base plate tunnel 3, and the gas of protected seam can enter base plate tunnel along layer-through drilling 31
3, the hole sealing tube 5 at layer-through drilling aperture is fixed using polyurethane, sealing of hole segment length is 2-4m, and hole sealing tube 5 is 2 cun
Pvc pipe, such as dual anti-real pipe, carries out mash gas extraction to protected seam by hole sealing tube 5, can also be by multiple hole sealing tubes 5 and bottom plate
Methane drawing pipeline (for according to needing to be arranged) connection in tunnel 3, carries out conjunction pumping；The interim envelope that layer-through drilling 31 is carried out
Hole is closed and is taken out, and can prevent gas overflowing in layer-through drilling 31 from causing gas exceeding limit in base plate tunnel 3；
During protective layer back production, the gas of protected seam can generate migration rule, therefore to during protective layer back production, can be with
Following measures are taken to carry out extraction to the gas of protected seam；
(2) before protective layer working face extraction, to destressing borehole 32 on every one group of 20-40m construction in base plate tunnel 3, originally
The pitch of holes of every group of destressing borehole 32 is 20 meters in embodiment, and destressing borehole 32 passes through 0.5 meter of protected seam, in base plate tunnel 3
Doorway is closed using enclosing wall 6, and methane gas extraction pipeline 7 is installed on enclosing wall 6, and methane gas extraction pipeline 7 protrudes into bottom plate
Tunnel 0-10 meters；Preferably, closed within the scope of 3 doorway of base plate tunnel inward 5 meters using enclosing wall 6, enclosing wall 6 by watt
Stone composition, 7 diameter of methane gas extraction pipeline are greater than or equal to Φ 426mm, and methane gas extraction pipeline 7 protrudes into 5-10 meters of base plate tunnel.
(3) after constructing, back production is carried out to protective layer, with the back production of protective layer, the gas pressure relief meeting of protected seam
It drills along the pressure release of construction and is poured in base plate tunnel 3；
(4) it during protective layer back production, is stayed by base plate tunnel 3 and sets methane gas extraction pipeline 7, to the gas pressure relief of protected seam
Carry out extraction.
It should be noted that the base plate tunnel be seated 13-1 seat earth (i.e. protected seam bottom plate 11) 19.1~
26.7m, back to 13-1 seat earth lithology is based on sandstone and sand paper mud stone, and pore-forming effect during drilling construction
It is good, without the hole phenomenon that collapses；After comprehensive analysis, " naked envelope " mode sealing of hole is just used.The base plate tunnel bottom plate coal seam distance 11-2 top
Plate (i.e. protective layer top plate) 41.5~57.0m, interlamellar spacing is larger, and protected seam is square on the protection layer, it can be ensured that 1123 (1) protection
Base plate tunnel 3 is taken risks without collapsing after layer working face extraction, in consideration of it, " naked by the way of the pre-buried gas pipeline of enclosing wall mouth
It takes out ".
Embodiment two:
The present embodiment two and the difference of embodiment one are: the distance between every group destressing borehole is 30 meters.
Embodiment three:
The present embodiment two and the difference of embodiment one are: the distance between every group destressing borehole is 40 meters.
1122 (1) working faces and 1123 (1) working faces are located at Ji Kuang (central area) east one 11-2 (2) exploiting field, and institute is right
The protected seam working face answered belongs to east one 13-1 (2) exploiting field, and gas bearing capacity, gas pressure and coal seam absolute altitude are substantially close.
(1) implementation result:
Corresponding protected seam 1122 (3) base plate tunnel of 1122 (1) working faces is using conventional borehole sealing of hole, conjunction stubble, extraction
Mode, corresponding protected seam 1123 (3) base plate tunnel in 1123 (1) are now cut using drilling " naked envelope ", tunnel " naked pumping " new process
Take extraction related data comparison during 1122 (1), the 1123 normal back production of (1) working face as follows:
1122 (3), 1123 lane (3) Di Chou extracting result contrast tables:
As seen from the above table, after using " naked envelope " " naked pumping " technique, 1123 (3) base plate tunnels and 1122 (3) base plate tunnels are taken out
It adopts effect to remain basically stable, realizes the purpose of material reducing, non-reduction.
(2) economic benefit
After " naked envelope ", " naked pumping " technique are implemented in base plate tunnel release extraction, reduce a large amount of inessential sealing of holes, pipeline expense
Investment.By taking 1123 (3) base plate tunnels as an example, which drills 396, average hole depth 90m, sealing material cost
1896.3 yuan/hole is, it can be achieved that 710,000 yuan of sealing material expense surplus；Release section tunnel length 950m, Φ 426mm gas pipeline peace
This 350 yuan/m is dressed up, Φ 159mm closes 1200 yuan of stubble multi-pass/set (one group a set of, amounts to 27 sets), is computed, pipeline installation is realized
Cost saves 36.5 ten thousand yuan, and other expenditure saves (expenses such as wired hose, pipe collar, clamp, slip casting ball valve, cost of labor) about 10
Wan Yuan adds up to 1,240,000 yuan/km of save the cost tunnel.
In addition, improving drilling construction efficiency.Drilling construction process is simplified using drilling " naked envelope " technology, drilling machine platform effect is reachable
4800m/ railway platform.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of protected seam gas pumping method, which comprises the following steps:
(1) in protected seam construction of bottom plates base plate tunnel, layer-through drilling of constructing in base plate tunnel, layer-through drilling is passed through and is protected
Layer, the 2~4m sections of tripping in hole sealing tubes in layer-through drilling pore carry out extraction to protected seam gas by hole sealing tube；
(2) before protective layer working face extraction, one group of destressing borehole of every 20-40m construction, destressing borehole pass through quilt in base plate tunnel
Protective layer is closed using enclosing wall on base plate tunnel doorway, and installs methane gas extraction pipeline on enclosing wall, gas drainage
Pipeline protrudes into 0-10 meters of base plate tunnel；
(3) back production is carried out to protective layer；
(4) during protective layer back production, the methane gas extraction pipeline set is stayed by base plate tunnel, and the gas pressure relief of protected seam is carried out
Extraction.
2. a kind of protected seam gas pumping method according to claim 1, which is characterized in that used in the step (1)
The hole sealing tube in layer-through drilling aperture is fixed in polyurethane.
3. a kind of protected seam gas pumping method according to claim 1, which is characterized in that in the step (1)
Hole sealing tube is 2 cun of pvc pipes.
4. a kind of protected seam gas pumping method according to claim 1, which is characterized in that every in the step (2)
The spacing of group destressing borehole is 20m.
5. a kind of protected seam gas pumping method according to claim 1, which is characterized in that every in the step (2)
Group destressing borehole passes through 0.5 meter of protected seam.
6. a kind of protected seam gas pumping method according to claim 1, which is characterized in that envelope in the step (2)
Wall is closed to be arranged within the scope of base plate tunnel doorway inward 5 meters.
7. a kind of protected seam gas pumping method according to claim 1, which is characterized in that in the step (2) watt
This extraction pipeline diameter is greater than or equal to Φ 426mm.
8. a kind of protected seam gas pumping method according to claim 1, which is characterized in that in the step (2) watt
This extraction pipeline protrudes into 5-10 meters of base plate tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026749.6A CN109441526A (en) | 2019-01-11 | 2019-01-11 | A kind of protected seam gas pumping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026749.6A CN109441526A (en) | 2019-01-11 | 2019-01-11 | A kind of protected seam gas pumping method |
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| Publication Number | Publication Date |
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| CN109441526A true CN109441526A (en) | 2019-03-08 |
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| CN201910026749.6A Withdrawn CN109441526A (en) | 2019-01-11 | 2019-01-11 | A kind of protected seam gas pumping method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374665A (en) * | 2019-07-31 | 2019-10-25 | 湖南科技大学 | A kind of gas collection device and application method for pole weak seam extraction borehole |
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| CN101251028A (en) * | 2008-04-03 | 2008-08-27 | 淮南矿业(集团)有限责任公司 | Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp |
| CN101275469A (en) * | 2008-05-12 | 2008-10-01 | 淮南矿业(集团)有限责任公司 | Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| CN102116169A (en) * | 2011-01-27 | 2011-07-06 | 中国矿业大学 | Drainage method for pressure-relief gas baseboard stonehead of protected seam |
| CN102644476A (en) * | 2012-05-10 | 2012-08-22 | 中国矿业大学 | Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel |
| CN103696801A (en) * | 2013-12-20 | 2014-04-02 | 安徽理工大学 | Method for testing surface borehole pressure relief gas drainage range |
| CN103775127A (en) * | 2013-12-31 | 2014-05-07 | 中国矿业大学 | Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group |
| CN107152303A (en) * | 2017-07-05 | 2017-09-12 | 安徽理工大学 | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane |
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2019
- 2019-01-11 CN CN201910026749.6A patent/CN109441526A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251028A (en) * | 2008-04-03 | 2008-08-27 | 淮南矿业(集团)有限责任公司 | Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp |
| CN101275469A (en) * | 2008-05-12 | 2008-10-01 | 淮南矿业(集团)有限责任公司 | Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| CN102116169A (en) * | 2011-01-27 | 2011-07-06 | 中国矿业大学 | Drainage method for pressure-relief gas baseboard stonehead of protected seam |
| CN102644476A (en) * | 2012-05-10 | 2012-08-22 | 中国矿业大学 | Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel |
| CN103696801A (en) * | 2013-12-20 | 2014-04-02 | 安徽理工大学 | Method for testing surface borehole pressure relief gas drainage range |
| CN103775127A (en) * | 2013-12-31 | 2014-05-07 | 中国矿业大学 | Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group |
| CN107152303A (en) * | 2017-07-05 | 2017-09-12 | 安徽理工大学 | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374665A (en) * | 2019-07-31 | 2019-10-25 | 湖南科技大学 | A kind of gas collection device and application method for pole weak seam extraction borehole |
| CN110374665B (en) * | 2019-07-31 | 2024-03-19 | 湖南科技大学 | Gas collection device for extraction drilling of extremely soft coal seam and use method |
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Application publication date: 20190308 |