CN101915118A - Method for progressive gas drainage in high gas medium-hard coal seam - Google Patents

Method for progressive gas drainage in high gas medium-hard coal seam Download PDF

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Publication number
CN101915118A
CN101915118A CN 201010252165 CN201010252165A CN101915118A CN 101915118 A CN101915118 A CN 101915118A CN 201010252165 CN201010252165 CN 201010252165 CN 201010252165 A CN201010252165 A CN 201010252165A CN 101915118 A CN101915118 A CN 101915118A
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China
Prior art keywords
stope
gas
extraction
zone
drainage
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CN 201010252165
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Chinese (zh)
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张海军
李国彪
申晋伟
刘毅
胡包生
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Priority to CN 201010252165 priority Critical patent/CN101915118A/en
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Abstract

The invention relates to a coal seam gas drainage method, specifically to a method for progressive gas drainage in high gas medium-hard coal seam, which solves the problem of areal gas extraction efficiency. When stopes in multiple roadways are excavated, a long borehole, the length of which is required to be capable of at least running through the distance of reserved roadway strips at two sides of the next stope, is constructed in advance for a next adjacent stope area inside a column outside the stope, drainage in the mining area of the next stope area is performed in advance during excavation of this stope, in order to guarantee that the next adjacent stope area has sufficient drainage time, roadway excavation of the next stope area is performed at the drained strip position, the adjacent stope area is then mined, and simultaneously, the long borehole is constructed for the next adjacent stope area to continue gas drainage in such a progressive, circulative advancing manner. Thus normal alternation of drainage, excavation and mining is ensured.

Description

The laddering gas drainage method of hard coal seam in the high gas
Technical field
The present invention relates to a kind of coal bed gas pumping method, be specially the laddering gas drainage method of hard coal seam in a kind of high gas.
Background technology
At highly gassy mine, gas is the principal element that threatens mine safety, has only the gas problem that solved, and could guarantee mine safety production, and " take out afterwards earlier and adopt " become the common recognition of coal mining enterprise.In advance the coal seam of wanting digging being carried out that gas drainage under suction handles is the effective measures of administering gas, and have only make the coal body gas bearing capacity drop to a certain degree by extraction in advance after, could in progress of coal mining, effectively control gas density, improve coal mining efficient, the generation of stopping gas accident.
In actual production process, draw out methane and need select different extraction technology according to factors such as the geological conditions of mine, gas bearing situation, roadway arrangements, but continuing the long period, this extraction process need guarantees the extraction effect.So drawing out methane has formed the contradiction of a pair of mutual restriction with efficient Fast Algorithm for Mining, particularly when driving face adopted the mode of the pick while taking out, drawing out methane to guarantee speedy drivage, also just can not guarantee to adopt normally, dig linking.
Summary of the invention
The present invention is for the problem of the extraction efficient that solves regional gas and the laddering gas drainage method of hard coal seam in a kind of high gas is provided.
The present invention is realized by following technical scheme, the laddering gas drainage method of hard coal seam in a kind of high gas, be when the stope that the many lanes of driving are arranged, in the crossheading of the outside of this stope, shift to an earlier date to the adjoining work plane of next one zone construction long drilled holes, the boring length requirement can run through the distance of the reservation tunnel band of next stope both sides at least, during this stope of driving, just the mining area to next stope zone in advance carry out extraction, guarantee that there is the enough extraction time in next stope zone, the tunnelling in next stope zone is carried out in the band position of extraction, gas has dropped to controlled degree, and stope zone gas bearing capacity has also dropped to level of security; And then exploit this adjacent stope zone, again to the long distance boring of the adjacent stope zone construction of the next one, continue gas drainage under suction simultaneously, the laddering circulation like this propelling of advancing.Guarantee normally taking over of pumping, excavation, mining.
Laddering gas drainage under suction pattern is applicable to the hard coal seam that the coal seam is stable, the inclination angle is less, gas permeability better is fit to the construction long drilled holes.Stope adopts many lane ventilation modes, so that construction drill and mining work mutually noninterfere, and the time and the space that keep the module extraction.During tunnelling, to the adjacent face layout area construction long drilled holes of adopting, carry out long-time extraction, thereby for tunnel speedy drivage and the back production of work plane safety create conditions, and realize back production face on this basis, circulation, laddering propelling and the visible coal reserve of pre-pumping mode piece and optimum the taking over of extraction coal amount.
Following advantage is arranged specifically: 1, carry out after the laddering gas drainage under suction pattern, because the assurance of extraction time is arranged, the coal seam gas-bearing capacity the extraction zone in has dropped to safe range, and interior (coal seam gas-bearing capacity is reduced to 8m 3/ t, it is following that gas pressure is reduced to 0.74MPa), gas bearing capacity and outburst amount obviously reduce, and reduce face air distribution amount, and changed situation portion protrusion-dispelling is regional extinction, has eliminated gas hidden danger, has improved the mine safety degree of reliability.
2, laddering gas drainage under suction will accomplish that long sealing of hole is tight.Through the extraction of certain hour, reach the extraction effect after, can be tunnel speedy drivage and create conditions, accomplish that tunnelling gas does not transfinite, drilling depth turns over, the laddering efficient back production of back production face, average daily production reaches more than 20000 tons, has realized that gas is taken out with driving in advance, back production is optimum to be connected.
3, because present domestic drilling drilling construction track is difficult for grasping, whole hole site is uncertain, preferentially uses the km rig to carry out laddering module extraction.Motor directional drilling technology at the bottom of the km rig employing hole can realize that boring has selection to creep into, when boring runs into geological structure, can walk around structure by opening branch, the design attitude of constructing carries out extraction targetedly, so both the borehole engineering amount can be reduced, the geological structure position can be accurately grasped again.
4, laddering gas drainage technique main solves the face gas problem of tunnelling and stope in time with on the space in advance, improves driving, back production efficient,, has excellent popularization and is worth and application prospect preferably in the hard coal seam in gas permeability.
Description of drawings
Fig. 1 is one of embodiments of the present invention
Fig. 2 is two of embodiments of the present invention
Among the figure: 1-tunnel, 2-stope, 3-stope zone, 4-reserve tunnel band, 5-stope zone, 6,7-long drilled holes
The specific embodiment
According to the type characteristic difference of rig, can use two kinds of methods to carry out laddering module extraction:
Embodiment 1, the laddering module gas drainage under suction of high-power rig,
As schematically shown in Figure 1, be when the stope 2 that the many lanes of driving are arranged, in the outside of this stope 2 crossheading 1, shift to an earlier date to the adjoining stope of next one zone 3 construction long drilled holes, use homemade high-power rig to arrange construction long drilled holes 6 every 5~10m to the adjacent face of adopting, the basic vertical working of holing is arranged, the boring length requirement can run through the distance of the reservation tunnel band 4 of next 3 both sides, stope zone at least, length is not less than 300m, the extraction scope covers adjacent face and the crossheading thereof adopted, during driving this stope 2, just the mining area to next stope zone 3 in advance carry out extraction, guarantee that next stope 3 has the extraction time of 1-3, the tunnelling in next stope zone 3 is carried out in the position of the tunnel band 4 of extraction 1-3, gas has dropped to controlled degree, and stope 4 gas bearing capacities have also dropped to level of security; And then exploit this stope 4, again to the adjacent long distance boring of stope zone 5 constructions of the next one, continue gas drainage under suction simultaneously, the laddering circulation like this propelling of advancing.Guarantee normally taking over of pumping, excavation, mining.
Embodiment 2, use the laddering gas pumping of km rig.As schematically shown in Figure 2,
The laddering gas drainage method of hard coal seam in a kind of high gas, be when the stope 2 that the many lanes of driving are arranged, in the outside of this stope 2 crossheading 1, shift to an earlier date to the adjoining work plane construction of next one long drilled holes 6, the boring length requirement can run through the distance of the reservation tunnel band of both sides, following two stopes zone at least, 500~600m, comprise two work planes, during driving this stope 2, just the mining area to next stope zone 3 in advance carry out extraction, guarantee that there is the extraction time of 1-3 in next stope zone 3, the tunnelling in next stope zone 3 is carried out in the position of the tunnel band 4 of extraction 1-3, gas has dropped to controlled degree, and stope zone 3 gas bearing capacities have also dropped to level of security; And then exploit this stope zone 3, again to the adjacent long distance boring of stope zone 5 constructions of the next one, continue gas drainage under suction simultaneously, the laddering circulation like this propelling of advancing.Guarantee normally taking over of pumping, excavation, mining.
Motor directional drilling technology at the bottom of the km rig employing hole can realize the directional drilling of holing, and can guarantee to hole and get to assigned address, and verify geological structure, accomplishes long apart from creeping into.Can increase extraction boring effective length by the hole branch of spudding in, improve the extraction effect.The accurate location of boring can make drilling track advance along roadway direction, improves the specific aim of boring, reduces the borehole engineering amount significantly.The use of km rig can improve the efficient of laddering module extraction greatly.Laddering extraction module coverage can reach 500~600m, comprises two work planes, thereby creates conditions for extensive area extinction and speedy drivage.The long drilled holes extraction has reduced envelope connection orifice ring joint, can improve extraction concentration and extraction system effectiveness.
When arranging laddering extraction, to note following some:
1, adopts km rig drill site construction fan type directional drilling, arrange the extraction module with the mode that the parallel boring of common drilling machine construction combines, each drill site is according to work plane different situations and geological conditions construction, boring direction is tried one's best and the vertical or oblique of coal seam master's fissure direction, whole hole site 30m outside the gate road of the border of next fully-mechanized mining working holes, in the blank space that km rig directional drilling can not cover, the common boring of constructing replenishes, and reaches leading evenly extraction effect.
2, boring should be as far as possible in hard coal seam, and the perforate height is greater than 1.5m, and the every 6m of boring design drift angle rate is not more than 1.5 degree, and perforate azimuth and azimuth, whole hole angle are less than 30 degree.
3, directional drilling is according to situations such as extraction time length and coal body gas permeabilities, the different long distance boring branch that constructs, and generally main split's quantity of each drilling construction is 1-3, at the bottom of the boring hole between the spacing 8-15m.
4, one in top branch is visited in directional drilling every 80-100m construction in construction, and one of bottom branch is visited in every 100m construction, makes it fully cover the coal seam, reaches better extraction effect.
5, disconnected extraction borehole may be dug in the tunnel in tunneling process, cut off boring after, should carry out on-the-spot shutoff or Feng Liankong extraction again immediately, boring is negative pressure and does not have the shutoff of carrying out that gas gushes out, otherwise sealing of hole is linked extraction again.Preventing in the hole that gas moment gushes out causes the driving face gas exceeding limit.
6, laddering extraction module, be formed up to down as far as possible and on take over order, making boring keep construction of up hole and extraction.
Application example, river, temple mine absolute gas emission rate reaches 780m 3/ min.Along with exploitation is constantly extended to the deep, coal seam gas-bearing capacity and pressure increase sharply, and have seriously restricted normal linking of mine and safety in production, particularly also exist coal and the outstanding threat of gas at regional area.Come into effect laddering gas drainage technique of the present invention from 2007, improved drivage efficiency greatly.Analyze with regard to the practical situations of laddering gas pumping below.
This ore deposit is in 4301 working face extraction processes, utilize Lane 43014, tunnel, the work plane outside to 5 of adjacent 4302 work planes construction km drill sites, total footage amount 73921m, 4302 43023 crossheading one side branched hole spacings is 12-15m, the whole hole length of holing exceeds 4302 tunnel 20-30m, the extraction one-year age, pure gas amount 1,231 ten thousand m of extraction 3, calculate the gas pumping rate and reach 40%.
Implementation result: the work plane coal seam gas-bearing capacity significantly reduces, and the number of times that transfinites obviously descends.Show that according to No. 3 coal-bed gas geological map in wellblock, east, Si He ore deposit the original content of 4302 work plane ton coal gas is 9-13m 3/ t zone, in the tunneling process actual measurement extraction after coal seam gas-bearing capacity be 7.8m 3/ t, coal seam gas-bearing capacity reduces greatly, satisfies the extraction index request.43023 lanes were once caused gas exceeding limit 5 times when the extraction zone is not tunneled, and did not occur one time the gas exceeding limit phenomenon when the driving of extraction zone.When the 504m tunnelling of not carrying out laddering extraction, prediction protrusion-dispelling index K 1Value exceeds standard 5 times; And when more than 1800 meter tunnelling after 1 year of laddering extraction, K does not appear 1The value phenomenon that exceeds standard.Mine connects to be adopted three teams average drill footage per month when extraction zone driving not and only is 300m, and when the later 43023 lanes driving of extraction 1 year, gas emission obviously reduces, and an average month digging footage reaches 620m, and single water inlet is flat has turned over one and turn over.
Find in the place km drilling machine construction processes such as 1302 in this ore deposit in eastern wellblock 3304,4302 and western wellblock, km boring length is long, coverage is big, the single hole gas emission is big, in work progress, easily cause the on-the-spot gas exceeding limit of drilling, therefore when drilling, gas and water separator need be installed, adopt cement injection mode sealing of hole, realize that the drilling construction process carries out gas pumping simultaneously, the gas of having avoided to a great extent causing because of spray orifice is visited and is reported to the police, the loss of power accident transfinites.

Claims (1)

1. the laddering gas drainage method of hard coal seam in the high gas, it is characterized in that when the stope (2) of the many lanes of driving layout, in the outside crossheading (1) of this stope (2), shift to an earlier date to adjoining stope zone (3) the construction long drilled holes (6) of the next one, the boring length requirement can run through the distance of the reservation tunnel band (4) of next both sides, stope zone (3) at least, during this stope of driving (2), just in advance extraction is carried out in the mining area of next stope (3), guarantee that there is the enough extraction time in next stope zone (3), the tunnelling in next stope zone (3) is carried out in the position of the tunnel of extraction band (4), gas has dropped to controlled degree, and stope (3) gas bearing capacity has also dropped to level of security; And then exploit this adjacent stope zone (3), again to adjacent stope zone (5) the long distance boring of construction (7) of the next one, continue gas drainage under suction simultaneously, the laddering circulation like this propelling of advancing.
CN 201010252165 2010-08-13 2010-08-13 Method for progressive gas drainage in high gas medium-hard coal seam Pending CN101915118A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104222A (en) * 2013-02-01 2013-05-15 中北大学 Method for pumping and collecting coal bed gas through combination of ground vertical well and long bedding drill hole
CN103216258A (en) * 2012-08-22 2013-07-24 山西晋城无烟煤矿业集团有限责任公司 Concentrated stripe type gas pumping and discharging method for kilometer drill machine
CN104018874A (en) * 2014-06-13 2014-09-03 中煤科工集团重庆研究院有限公司 Method for bedding drilling and working surface gas pre-extraction
CN104484492A (en) * 2014-10-30 2015-04-01 中煤科工集团重庆研究院有限公司 Method of evaluating section extraction connection rationality via gas extraction data step type
CN105971627A (en) * 2016-06-29 2016-09-28 河南理工大学 Anti-outburst and rapid tunneling method for mining roadways of large-dip-angle outburst coal seam
CN105971517A (en) * 2016-06-23 2016-09-28 中煤科工集团西安研究院有限公司 Underground progressive gas pre-extraction and directional hole drilling system and method for broken and soft coal seam
CN111764955A (en) * 2020-07-21 2020-10-13 中煤科工集团重庆研究院有限公司 Coal roadway advance region pre-extraction method based on directional extraction drilling cross-roadway arrangement

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216258A (en) * 2012-08-22 2013-07-24 山西晋城无烟煤矿业集团有限责任公司 Concentrated stripe type gas pumping and discharging method for kilometer drill machine
CN103216258B (en) * 2012-08-22 2016-03-02 山西晋城无烟煤矿业集团有限责任公司 Km rig concentrates strip-type to draw out methane method
CN103104222A (en) * 2013-02-01 2013-05-15 中北大学 Method for pumping and collecting coal bed gas through combination of ground vertical well and long bedding drill hole
CN103104222B (en) * 2013-02-01 2015-07-29 中北大学 Ground peupendicular hole combines extraction coal bed gas method with concordant long drilled holes
CN104018874A (en) * 2014-06-13 2014-09-03 中煤科工集团重庆研究院有限公司 Method for bedding drilling and working surface gas pre-extraction
CN104018874B (en) * 2014-06-13 2016-06-08 中煤科工集团重庆研究院有限公司 A kind of concordant method of taking out in advance face gas of holing
CN104484492A (en) * 2014-10-30 2015-04-01 中煤科工集团重庆研究院有限公司 Method of evaluating section extraction connection rationality via gas extraction data step type
CN104484492B (en) * 2014-10-30 2017-06-16 中煤科工集团重庆研究院有限公司 Section extraction is evaluated using gas pumping data step type be connected rational method
CN105971517A (en) * 2016-06-23 2016-09-28 中煤科工集团西安研究院有限公司 Underground progressive gas pre-extraction and directional hole drilling system and method for broken and soft coal seam
CN105971627A (en) * 2016-06-29 2016-09-28 河南理工大学 Anti-outburst and rapid tunneling method for mining roadways of large-dip-angle outburst coal seam
CN105971627B (en) * 2016-06-29 2017-12-08 河南理工大学 A kind of projecting coal bed stope drift active workings protrusion-dispelling speedy drivage method of high inclination-angle
CN111764955A (en) * 2020-07-21 2020-10-13 中煤科工集团重庆研究院有限公司 Coal roadway advance region pre-extraction method based on directional extraction drilling cross-roadway arrangement

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