CN106437826A - Coal-bed gas extraction method achieving automatic adjustment of negative-pressure drill-hole zoning and source differentiating - Google Patents
Coal-bed gas extraction method achieving automatic adjustment of negative-pressure drill-hole zoning and source differentiating Download PDFInfo
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- CN106437826A CN106437826A CN201611155888.1A CN201611155888A CN106437826A CN 106437826 A CN106437826 A CN 106437826A CN 201611155888 A CN201611155888 A CN 201611155888A CN 106437826 A CN106437826 A CN 106437826A
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- 238000000605 extraction Methods 0.000 title claims abstract description 114
- 238000013316 zoning Methods 0.000 title claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 48
- 239000003245 coal Substances 0.000 claims abstract description 41
- 238000005192 partition Methods 0.000 claims description 62
- 238000005553 drilling Methods 0.000 claims description 60
- 238000005086 pumping Methods 0.000 claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000011161 development Methods 0.000 claims description 7
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000005065 mining Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000018109 developmental process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Provided is a coal-bed gas extraction method achieving automatic adjustment of negative-pressure drill-hole zoning and source differentiating. The method comprises the steps of dividing an extraction source interval, blocking and connecting drill holes in a divided zone, installing a negative-pressure automatic valve and merging into an extraction pipeline. For the step of dividing the extraction source interval, according to geological conditions, construction time and other factors of a coal bed where the drill holes are located, by combining an existing valve capable of automatically adjusting extraction negative pressure, an extraction tunnel is divided into multiple adjustment spaces which perform regulation in a mutually independent mode, maximization of the efficiency of the extraction pipeline can be kept, the gas concentration of some extraction drill holes which are random and serious in air leakage can be kept at a limit value or above simultaneously, the gas concentration of the whole extraction pipeline is guaranteed, the utilization rate of gas is greatly increased while the gas extraction efficiency is guaranteed, and then the coal mining efficiency is improved.
Description
Technical field
The present invention relates to a kind of method for improving underground coal mine mash gas extraction concentration, is particularly well-suited to seam construction and develops not
Stable, mash gas extraction concentration is difficult to maintain the mine of more than limit value.
Background technology
Coal mine gas is to threaten one of main arch-criminal of mine safety, in recent years coal under the leader of party and state and supervision
Ore deposit security fields achieve a series of major technological breakthroughs so that the safety of coal mining has obtained significantly being lifted, but
Due to reasons such as coal in China preservation gas is big, buried depth is big, coal seam permeability is poor, complex geologic conditions, safety of coal mines still face
Face huge challenge.According to statistics, the accident for being caused by gas in annual colliery severe and great casualty is still occupied mainly
Position.In management aspect national regulation of strengthening safety in production, must be advanced in exploitation highly gassy mine and coal and gas outburst mine
Row gas pumping, extraction is not up to standard can not to be produced, meanwhile, long-term engineering practice and theoretical research show, gas pumping
It is the fundamental way for solving coal mine gas disaster.On the other hand, the gas that extraction goes out is good clean energy resource again, therefore carries out
The extraction of coal mine gas high-yield and high-efficiency is Safety of Coal Mine Production in the urgent need to and sustainable development and building a conservation-minded society
Needs.
Then coal mine gas drainage is carried out sealing of hole and connection hole, finally imports lane typically to the substantial amounts of drilling of coal seam construction
Extraction pipeline in road.China overwhelming majority coal seam belongs to lower permeability seam, gas pumping difficulty, and extraction borehole to be present more
Gas leak phenomenon after serious sealing of hole.Although the method for occurring in that some new closure drillings and coal petrography crack in recent years, does not have
This technical barrier can be fundamentally solved, and as extraction enters middle and late stage, the gas density of extraction is even more and is difficult to maintain
On certain limit.This is coal petrography and borehole fissure continued development due to the carrying out of gas pumping, adds the unit interval
The gas amount that interior coal body seepage flow goes out is reduced, and gas pumping total concentration will be caused to reduce further, if the gas in extraction pipeline
Concentration is within blast limit (methane content 5%-16%), it will threatened to extraction pipeline seat belt, it is possible in conveying
During occur gas explosion；If concentration is too low will be difficult by, can only be discharged, the methane gas for entering air are not only unrestrained
Having taken resource, serious pollution has also been brought to environment.
At present, once a lot of mines during gas pumping is carried out in pipeline concentration relatively low, in order to improve pipeline safety
Property and extraction concentration, substantially by closing hole, obtain higher gas extraction concentration by closing indivedual extraction boreholes, but by
In being accurately positioned, even several drilling gas leakage will be processed by the extraction system in closing whole piece tunnel sometimes, be made
Becoming great waste, extinction effect is not had as pass hole makes coal gas fully be discharged, also stays for mining afterwards
Lower potential safety hazard.To have height to have low for the gas density that is extracted out due to the drilling of the same area, and same drilling different periods extract out
Gas density also have bigger difference, current extraction system does not reach the drilling to different quality and is monitored distinguishing and carries out
Control to partition point source the requirement of extraction concentration, in recent years, some experts and scholars notice that extraction negative pressure is affected on gas density
Significantly, it was also proposed that some install control valve in extraction pipeline additional to reduce pipeline negative pressure to reaching raising mash gas extraction
The purpose of concentration, although the extensive way of this reduction pipeline negative pressure can cause gas density be maintained at certain limit it
On, but also reduce the extraction amount of each drilling in whole pipeline simultaneously, it is unfavorable for the raising of overall gas pumping efficiency.
Current gas pumping present situation：(1) determination of extraction negative pressure is complete by rule of thumb, in the coal seam of different permeability, no
Under the conditions of drilling depth together, different sealing qualities etc., lack the mash gas extraction concentration control theory of system and effectively refer to
Guiding method；(2) at present the observation of extraction concentration is mainly and monitoring device is installed in extraction pipeline, when discovery concentration is less than
Require during lower limit, to take the overall negative pressure of reduction to leak out to reducing drilling, be even switched off the extreme measures of whole piece extraction branch road
To improve the concentration of main pipe rail, it is difficult to meet the high-yield and high-efficiency of safety requirements and gas pumping；(3) drilling of the same area is taken out
It is low that the gas density for going out has height to have, and the gas density that same drilling different periods extract out also has a bigger difference, current extraction
System does not reach the requirement that the drilling to different quality is monitored controlling with distinguishing and carry out partition point source extraction concentration.
Content of the invention
Technical problem：The purpose of the present invention is in view of the shortcomings of the prior art, provides one kind and sends out for borehole fissure
The coal bed gas extraction method that the drilling negative pressure partition of randomness is automatically adjusted is educated, to reaching raising extraction watt to greatest extent
This concentration and overall gas pumping efficiency.
Technical scheme：The coal bed gas extraction method that the drilling negative pressure partition point source of the present invention automatically adjusts, including as follows
Step：
A. zoning scheme is determined according to tunnel and ature of coal condition：
(1) if construction layer-through drilling carries out coal bed gas extraction, and drilling construction is carried out in drill site, with each
Extraction borehole in individual drill site is a partition, i.e., one adjusts interval；
(2) carry out gas pumping if in construction concordant drilling in heading, according to seam construction developmental state and
Tunnelling efficiency is divided and adjusts interval；
B. the construction of extraction borehole is carried out according to roadway construction situation, carries out sealing of hole after the completion of extraction borehole construction, it
Afterwards according to zoning scheme is adjusted, successively the drilling in each partition is coupled together as one group, and drainage tube is installed；
C. negative pressure is automatically adjusted valve to be installed on the partition drainage tube for connecting；
D. the partition drainage tube for being provided with negative pressure and automatically adjusting valve is incorporated in the methane gas extraction pipeline in tunnel, and adjusts
Trying valve is automatically adjusted, gas pumping is carried out under negative pressure is automatically adjusted, makes the brill in each partition in whole extraction tunnel
Hole extraction negative pressure all independent automatically adjust in negative pressure under；
E. repeat step a-d, is fully completed construction up to each partition of whole piece extraction tunnel.
The extraction negative pressure for adjusting in each interval subregion is independent of each other under the regulation for automatically adjusting valve, to reach
It is preferably minimized to impact of the drilling that minority gas leakage is more serious to extraction pipeline concentration.
If the drilling in a drill site is with concordance on construction and engineering time, using a drill site as one
Partition.
If drilling is uniformly distributed in heading, according to following principle partition：
The development of a seam construction is unstable, or occurs local acutely construction in coal seam, or local structure region is along tunnel side
To during less than 3m, then structure realm adjusts interval as one；
If b local structure region is more than 3m, multiple regulation intervals are divided in structure realm, but adjacent interval must not be big
In 3m；
If more stable, rare obvious structure realm is developed in c coal seam, then control region is divided according to roadway construction efficiency
Between, take 8～15m scope interval as regulation and control.
Beneficial effect：As the present invention is based on solving during gas pumping due to the minority drilling entirety that causes of gas leakage
Concentration reduces, and reduces, according to pipeline extraction negative pressure is reduced, the method that inleakage improves gas density, it will cause entirety
The reduction of extraction efficiency, the particularly problem of the reduction of the less hole pumping and mining efficiency of most of gas leakage, the present invention passes through exploiting field
This problem of method effectively solving that extraction negative pressure partition point source automatically adjusts, partition principle according to seam construction developmental state and
Depending on tunnelling efficiency, because construction degree determines coalmass crevasse development degree, the reaction of tunnelling efficiency is partition
Ageing, the present invention is according to the species in mash gas pumping drilling place tunnel, coal geology structure development situation and on the extraction time
Whether it is close to the factor such as consistent and will drills and different negative pressure adjustment regions are divided into, and divides by automatically adjusting valve and realizing negative pressure
Negative pressure in drilling more serious for gas leakage in extraction pipeline can be reduced to appropriate level, that is, can guarantee that by the automatization that source is adjusted
The gas density of extraction will not be turned off causing pumping blind zone again, while other drillings in pipeline are not interfered with yet, this
The extraction efficiency of whole bye-pass ensure that to the full extent.The extraction negative pressure for adjusting in each interval subregion is automatic
It is independent of each other under the regulation of control valve, to reach impact drop of the drilling that minority gas leakage is more serious to extraction pipeline concentration
To minimum, while will not have undesirable effect to the extraction efficiency that remaining drills, it is ensured that the extraction efficiency of whole extraction pipeline.
Present invention is mainly applied to crossing-hole gas extraction and the concordant drilling gas extraction in heading, by negative pressure adjusted and controlled area
Between division, due to layer-through drilling in partition with concordant drill with concordance and relatively easy.With method is simple, section
Energy, environmental protection, the efficient feature of extraction, have wide applicability in the art.
Description of the drawings
Fig. 1 is application schematic diagram of the present invention in concordant extraction.
In figure：1- roof；2- tunnelling face；3- seat earth；4- tunnel；5- pipeline extraction end；6- pipeline is even
Fitting；7- negative pressure automatically adjusts valve；8- extraction borehole；9- drainage tube；10- drainage tube single port connector；11- drainage tube twoport
Connector；12- partition drainage tube；13- extraction pipeline；14- pipeline sealed end；The regulation and control of A- partition are interval；The regulation and control of B- partition are interval；
The regulation and control of C- partition are interval；The non-partition section of D-；M- partition does not mark section.
Specific embodiment
The present invention will be further described for embodiment in below in conjunction with the accompanying drawings：
The coal bed gas extraction method that the drilling negative pressure partition point source of the present invention automatically adjusts, comprises the following steps that：
A. zoning scheme is determined according to tunnel and ature of coal condition：
(1) if construction layer-through drilling carries out coal bed gas extraction, and drilling construction is carried out in drill site, with each
Extraction borehole in individual drill site is a partition, i.e., one adjusts interval；
(2) carry out gas pumping if in construction concordant drilling in heading, according to seam construction developmental state and
Tunnelling efficiency is divided and adjusts interval；
The extraction negative pressure for adjusting in each interval subregion is independent of each other under the regulation for automatically adjusting valve, to reach
It is preferably minimized to impact of the drilling that minority gas leakage is more serious to extraction pipeline concentration.
If the drilling in a drill site is with concordance on construction and engineering time, using a drill site as one
Partition.
If drilling is uniformly distributed in heading, according to following principle partition：
Seam construction development is unstable, or occurs local acutely construction in coal seam, or local structure region is along tunnel side
To during less than 3m, then structure realm adjusts interval as one；
If local structure region is more than 3m, multiple regulation intervals are divided in structure realm, but adjacent interval must not be big
In 3m；
If more stable, rare obvious structure realm is developed in coal seam, then regulation and control interval is divided according to roadway construction efficiency,
Take 8～15m scope interval as regulation and control.
B. the construction of extraction borehole is carried out according to roadway construction situation, carries out sealing of hole after the completion of extraction borehole construction, it
Afterwards according to zoning scheme is adjusted, successively the drilling in each partition is coupled together as one group, and drainage tube is installed；
C. negative pressure is automatically adjusted valve to be installed on the partition drainage tube for connecting；
D. the partition drainage tube for being provided with negative pressure and automatically adjusting valve is incorporated in the methane gas extraction pipeline in tunnel, and adjusts
Trying valve is automatically adjusted, gas pumping is carried out under negative pressure is automatically adjusted, makes the brill in each partition in whole extraction tunnel
Hole extraction negative pressure all independent automatically adjust in negative pressure under；
E. repeat step a-d, is fully completed construction up to each partition of whole piece extraction tunnel.
Embodiment 1 is as shown in figure 1, concordant drilling of constructing in heading 4 carries out gas pumping, partition regulation and control interval
A, B, C region, partition does not mark partition of section M section comprising several zone similarities A, B, C, does not all draw in figure, area
Section D does not carry out the region of partition and drilling construction for 2 rear of tunnelling face；
Start driving in heading 4 and driving distance be more than after 100m, routinely technology in regulation and control interval A in order
Construction extraction borehole 8, each partition internal drilling is carried out sealing of hole, connection drainage tube 9, is connected using drainage tube after the completion of all constructing
Drilling in partition is together in parallel by fitting 10 or drainage tube twoport connector 11, will finally be connected negative pressure and be automatically adjusted valve
7 partition drainage tube 12 is incorporated in extraction pipeline 13, carries out the interval construction of next partition regulation and control afterwards；
With the driving of heading 4, extraction technique is carried out therewith, and pipeline extraction end 5 is the extraction main pipe rail with mine
Connected interface, extraction pipeline 13 needs to extend to tunnel depths with extraction, and pipeline sealed end 14 plays sealing extraction pipeline
13 effects foremost, comprise the following steps；
A. after tunnelling, first negative pressure adjustment region A is marked according to partition principle, gas pumping of constructing in region a
Drilling 8, being drilled after finishing by design pitch construction in region a carries out sealing of hole, uses the mash gas pumping drilling after sealing of hole afterwards
Drainage tube 9 is connected on extraction pipe connections 10 or drainage tube twoport connector 11, and in single partition, mash gas pumping drilling is complete
By remaining for drainage tube twoport connector 11 interface and the partition extraction for connecting negative pressure and automatically adjusting valve 7 after portion's connection
Pipe 12 is connected and partition drainage tube 12 is incorporated in drainage tube 13, and now the extraction borehole in partition A starts in negative pressure certainly
The lower extraction of the effect of dynamic control valve 7；
B. according to step a, next partition is operated, and partition drainage tube is connected to the drainage tube through extending
Lu Shang；
C. according to step a, constantly by construction drill in partition and connect extraction, until roadway construction is completed, partition is divided
Till source automatically adjusts the whole tunnel of subregion covering；
The arrangement of methane gas extraction pipeline will be maintained a certain distance with tunnelling face 2, not affect tunnelling to construct
It is advisable, typically apart from more than 100m.
Circulate according to above step, until whole piece extraction roadway construction is finished, then in whole extraction tunnel in each partition
Hole pumping and mining negative pressure all independent automatically adjust in negative pressure under, accordingly even when do not know be which drilling or which
Drilling gas leakage is more serious, and due to dividing the pumping method of source regulation using negative pressure, the serious drilling negative pressure of gas leakage is made by regulation and control
With after the concentration in extraction pipeline will not be impacted, while also will not cause to other drilling groups for serious gas leakage do not occur
Impact so that overall extraction efficiency still keeps maximizing.
Claims (4)
1. a kind of coal bed gas extraction method that drilling negative pressure partition point source automatically adjusts, it is characterised in that：Comprise the steps：
A. zoning scheme is determined according to tunnel and ature of coal condition：
(1) if construction layer-through drilling carries out coal bed gas extraction, and drilling construction is carried out in drill site, with each brill
Extraction borehole in is a partition, i.e., one adjusts interval；
（2）Gas pumping is carried out if in construction concordant drilling in heading, according to seam construction developmental state and tunnel
Drivage efficiency is divided and adjusts interval；
B. the construction of extraction borehole is carried out according to roadway construction situation, carries out sealing of hole, Zhi Hougen after the completion of extraction borehole construction
According to zoning scheme is adjusted, successively the drilling in each partition is coupled together as one group, and drainage tube is installed；
C. negative pressure is automatically adjusted valve to be installed on the partition drainage tube for connecting；
D. the partition drainage tube for being provided with negative pressure and automatically adjusting valve is incorporated in the methane gas extraction pipeline in tunnel, and debugs
Valve being automatically adjusted, gas pumping is carried out under negative pressure is automatically adjusted, takes out the drilling in whole extraction tunnel in each partition
Adopt negative pressure all independent automatically adjust in negative pressure under；
E. repeat step a-d, is fully completed construction up to each partition of whole piece extraction tunnel.
2. the coal bed gas extraction method that drilling negative pressure partition point source according to claim 1 automatically adjusts, its feature exists
In：The extraction negative pressure for adjusting in each interval subregion is independent of each other under the regulation for automatically adjusting valve, separate,
Impact that can be by the more serious drilling of minority gas leakage to extraction pipeline concentration is preferably minimized.
3. the coal bed gas extraction method that drilling negative pressure partition point source according to claim 1 automatically adjusts, its feature exists
In：If the drilling in a drill site is with concordance on construction and engineering time, using a drill site as a partition.
4. the coal bed gas extraction method that drilling negative pressure partition point source according to claim 1 automatically adjusts, its feature exists
In：If drilling is uniformly distributed in heading, according to following principle partition：
The development of a seam construction is unstable, or occurs local acutely construction in coal seam, or local structure region is little along roadway direction
When 3m, then structure realm adjusts interval as one；
If b local structure region is more than 3m, multiple regulation intervals are divided in structure realm, but adjacent interval cannot be greater than
3m；
If more stable, rare obvious structure realm is developed in c coal seam, then regulation and control interval is divided according to roadway construction efficiency, take 8
~ 15m scope is interval as regulation and control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611155888.1A CN106437826A (en) | 2016-12-14 | 2016-12-14 | Coal-bed gas extraction method achieving automatic adjustment of negative-pressure drill-hole zoning and source differentiating |
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| CN201611155888.1A CN106437826A (en) | 2016-12-14 | 2016-12-14 | Coal-bed gas extraction method achieving automatic adjustment of negative-pressure drill-hole zoning and source differentiating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026129A (en) * | 2018-08-15 | 2018-12-18 | 山东安益矿用设备有限公司 | Height negative pressure line intelligent conversion control technique |
| CN109083676A (en) * | 2018-08-15 | 2018-12-25 | 山东安益矿用设备有限公司 | Coal mine gas extraction drill hole is grouped control technique |
| CN111119984A (en) * | 2019-12-30 | 2020-05-08 | 煤炭科学技术研究院有限公司 | System and method for intensive utilization of regional gas network and mutual feedback control of mine gas extraction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111119984A (en) * | 2019-12-30 | 2020-05-08 | 煤炭科学技术研究院有限公司 | System and method for intensive utilization of regional gas network and mutual feedback control of mine gas extraction |
| CN111119984B (en) * | 2019-12-30 | 2021-05-07 | 煤炭科学技术研究院有限公司 | System and method for intensive utilization of regional gas network and mutual feedback control of mine gas extraction |
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