CN102094671A - Three-dimensional gas extraction method for coal seams with low-permeability and low possibility of gas extraction - Google Patents

Three-dimensional gas extraction method for coal seams with low-permeability and low possibility of gas extraction Download PDF

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CN102094671A
CN102094671A CN2011100493912A CN201110049391A CN102094671A CN 102094671 A CN102094671 A CN 102094671A CN 2011100493912 A CN2011100493912 A CN 2011100493912A CN 201110049391 A CN201110049391 A CN 201110049391A CN 102094671 A CN102094671 A CN 102094671A
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gas
extraction
coal
pumping
mining
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CN2011100493912A
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Chinese (zh)
Inventor
何希霖
刘永禄
湛厚星
张胜文
高明涛
陈民
刘德春
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山东新矿赵官能源有限责任公司
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Publication of CN102094671A publication Critical patent/CN102094671A/en

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Abstract

The invention discloses a three-dimensional gas extraction method for coal seams with low permeability and low possibility of gas extraction. In the method, gases are extracted before mining, during mining and after mining in terms of time; surface gas extraction and underground gas extraction are combined in terms of space; combination of a fixed gas extraction mode and a mobile gas extraction mode is realized in terms of extraction mode; and combination of extraction for the purpose of safety and extraction for the purpose of gas reutilization is realized in terms of technical objective. The method has the beneficial effects of realizing safe, intensive and efficient production of coal mines and simultaneously promoting the comprehensive utilization of the gases.

Description

The three-dimensional gas pumping method of hypotonicity hard-pumped mining coal seam
Technical field
The present invention relates to the method for coal mine gas extraction, especially the gas pumping method of hypotonicity hard-pumped mining coal seam.
Background technology
Gas, be meant coal bed gas or mine gas at coal circle, gas is gas colourless, tasteless, odorless, is 0.554 to the relative density of air, and the density of gas is 0.716kg under standard state, the penetrating power of gas is 1.6 times of air, be insoluble in water, not combustion-supportingly can not keep breathing, when reaching finite concentration, the people is suffocated because of anoxic, and burning or blast can take place.Gas exists with free state and sorption state in coal body or country rock.When oxygen concentration reached 10% in the air, if gas density between 5-16%, will be blasted, concentration just can quietly be burnt when 30% left and right sides.Therefore the life security that gas is directly threatening the miner for Coal Production, if but utilize properly, can not only promote Safety of Coal Mine Production, can also open up and utilize the energy.Develop coal bed gas energetically, both can make full use of subterranean resource, can improve the mine safety condition again and increase economic efficiency, and help improving local environment quality and global atmosphere environment.Therefore; China's coal-mine thoroughly transition of people's conceptions aspect control gas disaster; coal mining enterprise should dispose go up from digging and gas is extracted and utilize the technological process that put production on the right course, gives abundant assurance from time and space, promotes that cbm development reaches large-scale production.Only in this way, coal in China gas disaster just can be effectively controlled, and highly gassy mine just can obtain new life along with the raising of the attenuating of administering gas disaster expense, production efficiency.
Generally adopt ground drilling gas pumping system in the prior art, before seam mining, extract fire damp in advance, lower fire damp concentration.CN101672196A (CN200910233072.X) discloses a kind of method that the gas pressure relief amount is adopted in the ground drilling extraction that improves, and improves the gas amount that pressure released seam is adopted in extraction when being applicable to ground drilling extraction goaf gas.By dropping into the crack that sandbag is linked up with shutoff ground drilling and goaf in the mash gas extraction pipe in being arranged in ground drilling; make ground drilling reduce the gas in extraction goaf; main extraction top protected seam adopt gas pressure relief; thereby increase substantially mash gas extraction concentration and extraction amount; reduce the gas bearing capacity of protected seam, the spontaneous combustionof coal that reduces the topping goaf simultaneously threatens.The method has not only improved the ground drilling extraction and has adopted the gas pressure relief amount, and has prolonged effective mash gas extraction time of ground drilling.
CN101644166A (CN200910182121.1) provides a kind of high gas low air permeability coal seam punching slot release permeability-increasing gas pumping method, after bit drills enters the precalculated position, coal seam, in boring, cut, form certain width and flat slot highly in the boring both sides with the high-pressure water jet of certain pressure and flow coal body to the boring both sides; Utilize high-pressure water jet that the coal body that cuts down is taken out of outside the hole.Increased slot place coal body exposed area in the boring greatly; formed flat slot has been equivalent to exploit in the subrange one deck topping as thin as a wafer; make coal mass relief in the boring, the anti-reflection and effective influence basin expansion of drawing-off gas; the coal body gas permeability has improved about 200~300 times, and single hole gas pumping amount on average can reach 0.3m 3/ min, gas pumping concentration can reach 30~60%, and the stope gas drainage efficiency reaches more than 50%, and after the slot release was anti-reflection, the firedamp taking-out discharging drilling number reduced 10~20%.Realize safe, efficient, the even extraction of the projecting coal bed gas of high gas low-permeable, uprising gas outburst danger coal seam is that present low gas does not have the outburst danger coal seam.
CN101251028A (CN200810023383.9) provides a kind of high gas layer group to exploit gob-side entry retaining Y-type ventilation pressure relief gas pumping mining method, it is characterized in that unloading nip in high gas layer cluster mining coal seam Retaining Roadways Along Goaf at Coal Face goaf top plate pressure relief district and base plate, be pooled to the free gas of desorb in top plate pressure relief crack circle and the base plate release crack circle for the crack passage that formed by mining influence by goaf top plate coal rock layer and base plate coal rock layer from contiguous release layer, in gob side entry retaining by be arranged in the circle of top plate pressure relief crack on carry out extraction to mash gas extraction boring and following boring that be arranged in the circle of release crack, bottom to mash gas extraction.The present invention fundamentally solves the low problem of high gas low air permeability coal seam group extraction rate, solve the distinguished and admirable gas exceeding limit problem of high gas layer cluster mining coal seam coal-face upper corner and return airway simultaneously, realized high concentration gas methane drainage and utilization project, realize high gas layer group's no coal column, efficiently reach safe working.
CN101319615A (CN200710054520.0) discloses a kind of goaf gas drainage method of stope working surface of coal mines, concrete steps are: arrange boring at the stope upper air duct earlier, the end of a year or month of boring is at the roof of stope, Deng back production during to the position of boring end of a year or month, because the automatic inbreak of roof, the gas in goaf moves up, enter upper air duct by the boring extraction of arranging in advance and discharge, this method is a kind of effective ways that the stope goaf gas of gas projecting mine is administered.
Above prior art has proposed the technical scheme of gas pumping from different sides, but the report that comprehensive omnibearing stereo gas pumping method is not arranged up to now as yet, and for hypotonicity hard-pumped mining coal seam, the low-permeability characteristics in coal seam have determined that the difficulty of gas pumping is very big, can only pass through three-dimensional, comprehensive solution gas pumping problem, just can reach the standard of safety in production.
Summary of the invention
The main cause that the present invention is directed to the highly gassy mine fire damp extraction of present restriction China is the low-permeability and the high plasticity in coal seam, and a kind of three-dimensional gas pumping method is provided.
Three-dimensional gas pumping method of the present invention, comprise: in time for adopt preceding, adopt in, adopt the back overall process gas pumping, spatially adopt the ground gas pumping to combine with underground gas extraction, realize that on the extraction mode fixedly the mash gas extraction mode combines with mobile mash gas extraction mode, on technical goal realization with safety be purpose extraction be utilized as the purpose extraction again with gas and combine.
The term explanation:
Hole, coal seam: the boring of in the coal seam, constructing.
High-order hole: in the boring of roof construction.
Technical scheme of the present invention is as follows:
A kind of three-dimensional gas pumping method comprises ground drilling gas pumping, down-hole tunneling gas extraction and goaf gas extraction, it is characterized in that step is as follows:
1, adopts preceding gas pumping
Comprehensively before coal mining carry out taking out in advance of coal-bed gas, bore the gas pumping well from ground,, the gas density in coal seam is reduced to below 30% by the gas in the leading extraction of this extraction well coal seam.
In the tunnelling process, the gas pumping while tunneling is accomplished fluently simultaneously pre-gas pumping boring in the coal seam, with ground gas pumping well UNICOM, before mine coal-cutting begins 1-2 days, takes out coal-bed gas once more in advance the gas density in coal seam is reduced to below 25%.
2, adopt middle gas pumping
The comprehensive Bian Caibian that carries out gas takes out in the coal-face exploitation process; That utilizes the coal face progradation unloads the nip pumping and mining pressure relief mash gas;
Utilize variety of way, extraction fissure zone gas in exploitation process;
In exploitation process, gas pumping is carried out in the goaf by the return air corner;
In exploitation process, pass through the extraction of ground drilling dynamic pressure goaf gas.
3, adopt the after gas extraction
After the coal work back production, accumulate gas to contiguous influence of adopting face for reducing exploiting field, to the continuation extraction of exploiting field gas, the one, the sealing mash gas extraction; The 2nd, utilize extraction engineering in crack to the extraction of exploiting field gas; The 3rd, utilize ground drilling to the extraction of exploiting field gas.
Technical characterstic of the present invention is as follows:
(1) gas pumping that combines with the down-hole of ground
It is to realize that high gas to the basic road that present low gas changes, promptly only takes ground to shift to an earlier date the measure of extraction that ground shifts to an earlier date mash gas extraction, could solve whole extraction and be connected with the good of production, realizes by the preceding present low gas transformation of high gas when exploiting of exploitation.Carried out surface drilling coal seam pressure break gas pumping, at ground drilling to the extraction of dynamic pressure goaf gas for realizing the three-dimensional mash gas extraction, set up mine gas extraction system, under mine, set up portable gas pumping system.Take out in advance with the down-hole in advance for the ground of realizing working seam take out in advance in advance, with adopting with taking out, form the gas pumping system that ground combines with the down-hole, as shown in Figure 1
(2) adopt preceding, adopt in, adopt the back overall process gas pumping
For the gas preventing and control in the soft single coal seam of low-permeable, only take aggregate measures, realize adopting preceding, adopt in, adopt the gas pumping of back overall process, could realize the conversion to the present low gas district by high gas district, be mine production establishment essential safe type environment.Gas pumping is comprehensively before coal mining to carry out taking out in advance of coal-bed gas before adopting.The one, ground utilizes the gas pumping well of variety of way, presses mine production and is connected planning, and the gas in leading extraction coal seam reduces seam gas content; The 2nd, when mine coal-cutting is prepared, take out coal-bed gas in advance.In the tunnelling process, when carrying out the tunneling gas extraction of taking out, in tunneling process, fulfil the pre-gas pumping boring in coal seam ahead of schedule by design while digging, carry out taking out in advance of coal-bed gas with mine gas extraction systems connection.In tunneling process, do not finish adopt before coal-bed gas smoke engineering in advance, before coal mining, finish coal-bed gas and take out engineering in advance, find time in advance by design coal-bed gas taken out in advance; The 3rd, implement the downhole modules gas pumping, take out coal-bed gas as far as possible in advance in advance.Adopting gas pumping is that the comprehensive Bian Caibian that carries out gas takes out in the coal-face exploitation process.The one, that utilizes the coal face progradation unloads the nip pumping and mining pressure relief mash gas; The 2nd, utilize variety of way extraction fissure zone gas in exploitation process; The 3rd, in exploitation process, gas pumping is carried out in the goaf by the return air corner; The 4th, in exploitation process, pass through the extraction of ground drilling dynamic pressure goaf gas.Adopting the after gas extraction is after the coal work back production, accumulates gas to contiguous influence of adopting face, to the continuation extraction of exploiting field gas for reducing exploiting field.The one, the sealing mash gas extraction; The 2nd, utilize extraction engineering in crack to the extraction of exploiting field gas; The 3rd, utilize ground drilling to the extraction of exploiting field gas.
(3) the fixing gas pumping that cooperates with mobile phase
The fixing gas pumping that cooperates with mobile phase is based on grass gas pumping system, cooperate the down-hole to move the gas pumping system, in conjunction with on-the-spot actual gas pumping condition, with the provisional and simplicity of mobile gas pumping system, the auxiliary extraction that realizes coal-bed gas.As replenishing of mine gas extraction system, the one, the extraction place, down-hole that mine gas extraction system can not be in time; The 2nd, the digging point that gas emission is less relatively; The 3rd, the extraction effect of mine gas extraction system there is the extraction place of considerable influence; The 4th, the gas pumping place is carried out in the down-hole temporarily.
Occurrence characteristics in view of China coal seam, the emphasis of China's cbm development production should be placed on the down-hole, utilize the digging tunnel under the coal mine, and make full use of the mining influence of mine pressure, hole and other various effective technologies are strengthened the gas drainage under suction in coal seam by drilling, should further study and constantly improve technology and the drilling technique that improves the coal seam permeability simultaneously, research improves the technology of gaseous mass, the harmonic extraction supporting technology and the coal mine gas of research underground coal and gas utilize technology, make it to send out supporting industries with down-hole coal bed air to open.On-site measurement and experimental study show, adopts rear abutment pressure and change transmission coefficient to working seam and change and play a major role, and the transmission coefficient in coal seam is extremely low and gas pressure is increasing in the extending stress band of stope the place ahead, so its inner gas emission can descend; When the sharply increase of working seam release, wall rock loosening after gas outburst amount, the transmission coefficient value increases a lot, can reach hundreds of times, and the desorb flow is also increased a lot, and the regularity of distribution of getting the mining induced fissure band clear has promptly been known the migration pathway of gas.Therefore, the regularity of distribution of getting the mining induced fissure band clear then can further be studied the migration rule of gas in overlying strata mining induced fissure band.This provides strong theoretical foundation for the gas drainage under suction under the mining influence and utilization.
The present invention is directed to the soft single coal seam conditions of low-permeable, set up the dynamic gas pumping system of omnibearing stereoization.Realize in time adopting preceding, adopt in, adopt the gas pumping of back overall process, realize that spatially ground combines with underground gas extraction, realize that on the extraction mode fixedly the mash gas extraction mode combines with mobile mash gas extraction mode, realizes by the safety extraction to utilizing extraction to combine on benefit.Along with comprehensive foundation of this system and perfect, realized the intensive High-efficient Production of safety of coal mines, also promoted the comprehensive utilization of gas simultaneously.
The specific embodiment
Embodiment:
1) gas pumping that combines with the down-hole of ground
It is to realize that high gas to the basic road that present low gas changes, promptly only takes ground to shift to an earlier date the measure of extraction that ground shifts to an earlier date mash gas extraction, could solve whole extraction and be connected with the good of production, realizes by the preceding present low gas transformation of high gas when exploiting of exploitation.Carried out surface drilling coal seam pressure break gas pumping, at ground drilling to the extraction of dynamic pressure goaf gas for realizing the three-dimensional mash gas extraction, set up mine gas extraction system, under mine, set up portable gas pumping system.Take out in advance with the down-hole in advance for the ground of realizing working seam take out in advance in advance, with adopting with taking out, form the gas pumping system that ground combines with the down-hole.
(2) gas pumping of overall process
For the gas preventing and control in the soft single coal seam of low-permeable, only take aggregate measures, realize adopting preceding, adopt in, adopt the gas pumping of back overall process, could realize the conversion to the present low gas district by high gas district, be mine production establishment essential safe type environment.
Gas pumping is comprehensively before coal mining to carry out taking out in advance of coal-bed gas before adopting.The one, ground utilizes the gas pumping well of variety of way, presses mine production and is connected planning, and the gas in leading extraction coal seam reduces seam gas content; The 2nd, when mine coal-cutting is prepared, take out coal-bed gas in advance.In the tunnelling process, when carrying out the tunneling gas extraction of taking out, in tunneling process, fulfil the pre-gas pumping boring in coal seam ahead of schedule by design and carry out taking out in advance of coal-bed gas with mine gas extraction systems connection while digging.In tunneling process, do not finish adopt before coal-bed gas smoke engineering in advance, before coal mining, finish coal-bed gas and take out engineering in advance, find time in advance by design coal-bed gas taken out in advance; The 3rd, implement the downhole modules gas pumping, take out coal-bed gas as far as possible in advance in advance.Adopting gas pumping is that the comprehensive Bian Caibian that carries out gas takes out in the coal-face exploitation process.The one, that utilizes the coal face progradation unloads the nip pumping and mining pressure relief mash gas; The 2nd, utilize variety of way extraction fissure zone gas in exploitation process; The 3rd, in exploitation process, gas pumping is carried out in the goaf by the return air corner; The 4th, in exploitation process, pass through the extraction of ground drilling dynamic pressure goaf gas.Adopting the after gas extraction is after the coal work back production, accumulates gas to contiguous influence of adopting face, to the continuation extraction of exploiting field gas for reducing exploiting field.The one, the sealing mash gas extraction; The 2nd, utilize extraction engineering in crack to the extraction of exploiting field gas; The 3rd, utilize ground drilling to the extraction of exploiting field gas.
(3) the fixing gas pumping that cooperates with mobile phase
The fixing gas pumping that cooperates with mobile phase is based on grass gas pumping system, cooperate the down-hole to move the gas pumping system, in conjunction with on-the-spot actual gas pumping condition, with the provisional and simplicity of mobile gas pumping system, the auxiliary extraction that realizes coal-bed gas.As replenishing of mine gas extraction system, the one, the extraction place, down-hole that mine gas extraction system can not be in time; The 2nd, the digging point that gas emission is less relatively; The 3rd, the extraction effect of mine gas extraction system there is the extraction place of considerable influence; The 4th, the gas pumping place is carried out in the down-hole temporarily.

Claims (1)

1. the three-dimensional gas pumping method of a hypotonicity hard-pumped mining coal seam comprises ground drilling gas pumping, down-hole tunneling gas extraction and goaf gas extraction, it is characterized in that step is as follows:
The first step: adopt preceding gas pumping
Comprehensively before coal mining carry out taking out in advance of coal-bed gas, bore the gas pumping well from ground,, the gas density in coal seam is reduced to below 30% by the gas in the leading extraction of this extraction well coal seam;
In the tunnelling process, the gas pumping while tunneling is accomplished fluently simultaneously pre-gas pumping boring and ground gas pumping well UNICOM in the coal seam, before mine coal-cutting begins 1-2 days, takes out coal-bed gas once more in advance the gas density in coal seam is reduced to below 25%;
Second step: adopt middle gas pumping
The comprehensive Bian Caibian that carries out gas takes out in the coal-face exploitation process, and that utilizes the coal face progradation unloads the nip pumping and mining pressure relief mash gas; Specific as follows:
Utilize variety of way, extraction fissure zone gas in exploitation process;
In exploitation process, gas pumping is carried out in the goaf by the return air corner;
In exploitation process, pass through the extraction of ground drilling dynamic pressure goaf gas;
The 3rd step: adopt the after gas extraction
After the coal work back production, accumulate gas to contiguous influence of adopting face for reducing exploiting field, exploiting field gas is continued extraction, the one, the sealing mash gas extraction; The 2nd, utilize extraction engineering in crack to the extraction of exploiting field gas; The 3rd, utilize ground drilling to the extraction of exploiting field gas.
CN2011100493912A 2011-02-27 2011-02-27 Three-dimensional gas extraction method for coal seams with low-permeability and low possibility of gas extraction CN102094671A (en)

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CN102383830A (en) * 2011-09-30 2012-03-21 中煤科工集团重庆研究院 Comprehensive outburst prevention method for outburst coal seam region
CN103541710A (en) * 2013-10-16 2014-01-29 中国矿业大学 Method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of coal mine
CN106223998A (en) * 2016-09-23 2016-12-14 安徽理工大学 Rock protective layer face gas administering method under one closely tight roof
CN106988778A (en) * 2017-05-18 2017-07-28 大同煤矿集团有限责任公司 A kind of low preservation, the high three-dimensional administering method of the gas gushed out point source partition
CN107100665A (en) * 2017-06-09 2017-08-29 西安科技大学 A kind of coal bed gas extraction indirect economic effect evaluation method based on mine gas Treatment design
RU2700141C1 (en) * 2018-11-29 2019-09-12 Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) Method of determining boundaries of methane-hazardous area of mined-out area near mining face

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
CN102226412A (en) * 2011-05-24 2011-10-26 中国矿业大学 Underground dark mining drilling well gas extraction method
CN102226412B (en) * 2011-05-24 2013-06-05 中国矿业大学 Underground dark mining drilling well gas extraction method
CN102383830A (en) * 2011-09-30 2012-03-21 中煤科工集团重庆研究院 Comprehensive outburst prevention method for outburst coal seam region
CN102383830B (en) * 2011-09-30 2014-12-24 中煤科工集团重庆研究院有限公司 Comprehensive outburst prevention method for outburst coal seam region
CN103541710A (en) * 2013-10-16 2014-01-29 中国矿业大学 Method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of coal mine
CN103541710B (en) * 2013-10-16 2016-01-20 中国矿业大学 Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually
CN106223998A (en) * 2016-09-23 2016-12-14 安徽理工大学 Rock protective layer face gas administering method under one closely tight roof
CN106988778A (en) * 2017-05-18 2017-07-28 大同煤矿集团有限责任公司 A kind of low preservation, the high three-dimensional administering method of the gas gushed out point source partition
CN107100665A (en) * 2017-06-09 2017-08-29 西安科技大学 A kind of coal bed gas extraction indirect economic effect evaluation method based on mine gas Treatment design
RU2700141C1 (en) * 2018-11-29 2019-09-12 Федеральное Государственное Бюджетное Учреждение Науки Институт Проблем Комплексного Освоения Недр Им. Академика Н.В. Мельникова Российской Академии Наук (Ипкон Ран) Method of determining boundaries of methane-hazardous area of mined-out area near mining face

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Application publication date: 20110615