CN1534164A - Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method - Google Patents
Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method Download PDFInfo
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Abstract
A remotely pressure-releasing method for sucking and exhausting gas from the low-air-permeability high-gas soft and thick coal seam is disclosed. The coal seam, which is 70m under the coal seam to be gas-exhausted and has relative interbeam distance of 30-70 times, is first mined. Under the action of pressure release and subsidence, the cracks are generated in the coal seam and the gas penetrates through the cracks and then is exhausted via predrilled holes. After the coal seam is mined, a great deal of gas is flowing along the seam and then is sucked by said predrilled holes.
Description
Technical field:
The present invention relates to the Safety of Coal Mine Production method.A kind of coal-bed gas of more specifically saying so is taken out method in advance.
Background technology:
The Anhui Huainan Mining Area is located in the innerland, East China, is China important energy base.Rich coal resources in the mining area, the minable coal seam number of plies is many, pressure released seam compose deposit stable, thickness is bigger.Huainan Mining Area master's mining coal seam 13# coal seam average thickness 6m, the original gas pressure in coal seam is 4.4MPa, gas bearing capacity is 13m
3/ t, gas permeability of coal seam coefficient are 0.01135m
2/ (MPa
2.d), be the soft thick outburst danger of the high gas of typical low-permeable coal seam.Coal and gas burst accident and the especially big gas explosion accident that causes many people death once repeatedly took place in the recovery process in this coal seam, the heading driving speed only is 40～60m, the fully-mechanized mining working average product only is 1700t/d, work plane relative abundance of methane 25m
3/ d, the gas density in the return is put the limit management by 1.5%.If work plane output is brought up to 5000t/d, the face gas outburst amount will be up to 87m
3/ min.This shows, do not take effective gas drainage method just can not realize safe and efficient intensification production.Adopt traditional coal-bed gas to take out method in advance in Huainan Mining Area, the coal bed gas drainage rate is lower than 15%, and will realize that safe and efficient intensification production coal bed gas drainage rate should reach more than 60%.
At present the existing method that draws out methane comprises that also working seam top board height takes out lane method and working seam top board length apart from the layer-through drilling method.Wherein, the top board height take out the lane method be with the extraction roadway arrangement in the top board fissure zone, gas pressure relief compiles to the extraction tunnel along the flow channel that vertical disrumpent feelings crack forms, this method has good extraction effect for the coal seam that is in the fissure zone, and for the pressure released seam that is in the bending subsidence band, owing to there is not vertical disrumpent feelings crack, can't forms gas and take out the flox condition that the lane is compiled to height, so the gas of extraction pressure released seam effectively along interlayer.Top board length is to beat long distance by the working seam return airway to pressure released seam to wear layer extraction boring apart from the layer-through drilling method, because boring will be passed caving zone, boring will short circuit occur with the goaf conducting, so the method gas of the long-range pressure released seam of extraction effectively.
Summary of the invention:
Technical problem to be solved by this invention is to avoid existing weak point in the above-mentioned prior art, the long-range gas pressure relief extraction of the soft high seam of the high gas of a kind of low-permeable method is provided, effectively scientifically improve the soft high seam gas drainage efficiency of the high gas of low-permeable, the coal bed gas drainage rate is brought up to more than 60%, to realize the production of safety of coal mines high-efficiency intensifying by original 15%.
Summary of the invention:
The characteristics of the inventive method are:
The long-range gas pressure relief extraction of the soft high seam of the high gas of low-permeable method, it is characterized in that at first exploiting bottom, opposite layer spacing and be 30 to 40 times mining coal seam apart from pressure released seam 70m, adopted release and sinking effect, in pressure released seam, form release crack along layer separation fracture, get to the gridding type layer-through extraction to pressure released seam by pressure released seam base plate gas drainage under suction lane in advance and hole, gas pressure relief compiles along holing to extraction along layer separation fracture, and is able to extraction by extraction pipeline.
After the working seam exploitation, will form caving zone, fissure zone and bending subsidence band at its above goaf.Pressure released seam apart from 35 times of working seam top 70m, the opposite layer spacing ratio of the thickness of working seam (interlamellar spacing with) is in the bending subsidence band.Be subjected to the mining influence of working seam, pressure released seam produces dilatancy and cracking, forms based on the release crack along layer separation fracture in coal body, and the gas permeability of coal seam coefficient is by original 0.01135m
2/ (MPa
2.d) be increased to 32.678m
2/ (MPa
2.d), 2880 times have been increased.In pressure released seam, produce the moving condition of desorption of mash gas and accordant junction in large area.At this moment, owing to do not have vertical disrumpent feelings crack in pressure released seam and the base plate certain limit thereof, can't form gas pressure relief along the interlayer condition that flows of working seam downwards, must be before exploitation get to the gridding type layer-through extraction to pressure released seam ground and hole, in time the pressure relief gas pumping in the coal seam is released by pressure released seam base plate gas drainage under suction lane.The present invention can large tracts of land, reduce the gas bearing capacity of pressure released seam effectively, realizes the safe and efficient back production of pressure released seam.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention gets on the grid type to wearing a layer extraction boring to pressure released seam equably by pressure released seam base plate gas drainage under suction lane, gas pressure relief is compiled to extraction boring along layer separation fracture in the effect lower edge of extraction negative pressure, carry out extraction by extraction pipeline, thereby large tracts of land, reduce the gas bearing capacity of pressure released seam effectively.
2, adopt the present invention can make interlamellar spacing 70m, the opposite layer spacing is that 30 to 40 times of pressure released seam gas drainage efficiencies under the condition reach more than 60%, and coal seam gas-bearing capacity is by 13m
3/ t reduces to 5m
3/ t.In release extraction zone, eliminated the coal and the gas outburst risk of pressure released seam all sidedly, the coal road moon driving speed by 40 original～60m, bring up to more than the 200m.The coal-face average product is brought up to 5100t/d by original 1700t/d; Relative abundance of methane is by original 25m
3/ t is reduced to 5.0m
3/ t; The average gas density of return is reduced to 0.5% by original 1.15%.Realized the safe and efficient back production of the soft high seam of the high gas of low-permeable, a large amount of gas drainage under suction has simultaneously also reduced the destruction of gas to ozone layer.
Accompanying drawing is the concrete coal seam sectional schematic diagram of using of the inventive method.
Number in the figure: 1 working seam, 2 pressure released seams, 3 extractions boring, 4 base plate gas drainage under suction lanes, 5 bending subsidence bands, 6 fissure zones, 7 caving zones.
The specific embodiment:
At Huainan Mining Area, at first exploit 70m bottom, opposite layer spacing and be 30 to 40 times 11# working seam 1 apart from 13# pressure released seam 2.Adopted release and sinking effect, in 13# pressure released seam 2, form release crack along layer separation fracture, get to gridding type layer-through extraction boring 3 to pressure released seam 2 by pressure released seam 2 base plate gas drainage under suction lanes 4 in advance, gas pressure relief compiles to extraction boring 3 along suitable layer separation fracture, and is able to extraction by extraction pipeline.
In concrete the enforcement:
1, about the rational position in base plate gas drainage under suction tunnel.
Press theory according to the ore deposit, after 1 exploitation of 11# working seam, its overlying rock will form caving zone 7, fissure zone 6 and bending subsidence band 5.According to Huainan, Anhui Pan Yikuang practical measurement, caving zone 7 highly is 8.5～11.0m, and fissure zone 6 highly is 30.1～36.1m, and the coal rock layer in 13# pressure released seam and its underpart 30m scope is in the bending subsidence band 5 of working seam back production formation.If 4 positions, base plate gas drainage under suction lane are low excessively, the tunnel may enter in the fissure zone 6, to cause the roadway maintenance difficulty, simultaneously because the crack that country rock forms is linked up firedamp taking-out discharging drilling sealing of hole section and underground atmosphere, the concentration that draws out methane is low, the extraction weak effect may cause a large amount of gas to gush out to base plate extraction lane, produces gas explosion hidden danger.If 4 positions, base plate gas drainage under suction lane are too high, the tunnel is nearer apart from the 13# coal seam, and the tunnel may be worn projecting coal bed by mistake and be produced outstanding accident, and the construction to extraction boring 3 simultaneously causes difficulty.Amid all these factors and consider the needs that parameter is investigated, we are arranged in gas drainage under suction lane 4 in the bending subsidence band 5 of 13# seat earth 10～20m.
2, about extraction drill site and extraction data of holes drilled.
By the analog computation analysis of gas drainage under suction process, we drew in the effective extraction phase, and the extraction bore diameter is 90mm, and the effective extraction radius of layer-through drilling is 15～20m, and extraction boring evenly distributes in pressure released seam.For this reason, can be in base plate gas drainage under suction lane arrange a drill site every 30～40m, drill site is perpendicular to base plate gas drainage under suction lane horizontal arrangement, each drill site length 5m, and net section is about 6m
2The boring position of opening is positioned at the drill site top.
3, the effective gas drainage under suction time
Find by long-range gas pressure relief flowing law investigation, the long-range active period of the mobile existence of gas pressure relief of adopting, timely extraction can obtain to stablize the gas pressure relief stream of high yield in during this period, raising coal bed gas drainage rate.Be subjected to the efficient gas drainage under suction time of working seam mining influence to be about 2 months, efficiently move towards the extraction distance and be 160m, the drill site number that works simultaneously is 4～5, and the boring of extraction simultaneously number is 16～20, and average single hole gas drainage under suction amount is at 1.0m
3About/min.After 4 months time of extraction, the coal bed gas drainage rate can reach more than 60% continuously.
Claims (4)
1, the long-range gas pressure relief extraction of the soft high seam of the high gas of low-permeable method, it is characterized in that at first exploiting apart from bottom, the opposite layer spacing of pressure released seam (2) 70m is 30 to 40 times working seam (1), adopted release and sinking effect, in pressure released seam (2), form release crack along layer separation fracture, get to gridding type layer-through extraction boring (3) to pressure released seam (2) by pressure released seam base plate gas drainage under suction lane (4) in advance, gas pressure relief compiles to extraction boring (3) along suitable layer separation fracture, and is able to extraction by extraction pipeline.
2, the long-range gas pressure relief extraction of the soft high seam of the high gas of low-permeable according to claim 1 method is characterized in that described gas drainage under suction lane (4) is arranged in the bending subsidence band (5) of pressure released seam (2) base plate 10～20m.
3, the long-range gas pressure relief extraction of the soft high seam of the high gas of low-permeable according to claim 1 method is characterized in that described layer extraction boring (3) diameter of wearing is that 90mm, effective extraction radius are 15～20m, evenly distribute in pressure released seam (2).
4, the long-range gas pressure relief extraction of the soft high seam of the high gas of low-permeable according to claim 3 method, it is characterized in that in base plate gas drainage under suction lane (4), arranging a drill site every 30～40m, drill site is perpendicular to base plate gas drainage under suction lane (4) horizontal arrangement, each drill site length 5m, net section is for being about 6m
2, wear layer position of opening of extraction boring and be positioned at the drill site top.
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Cited By (23)
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| CN1313702C (en) * | 2005-06-02 | 2007-05-02 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN100535395C (en) * | 2007-04-06 | 2009-09-02 | 中国矿业大学 | Gridding type layer-through drilling pore group permeability-increasing gas pumping method |
| CN101824982A (en) * | 2010-04-19 | 2010-09-08 | 中国矿业大学 | Coal bed gas drainage effective radius measuring method |
| CN101915083A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
| CN101963066A (en) * | 2010-03-03 | 2011-02-02 | 北京鑫源九鼎科技有限公司 | Method for drawing out methane from bedding plane of coal seam by hydraulic fracturing |
| CN102080530A (en) * | 2010-12-22 | 2011-06-01 | 北京奥瑞安能源技术开发有限公司 | Method for constructing horizontal coal bed gas well and vertical drainage and mining well |
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| 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 |
| CN102162367A (en) * | 2011-03-23 | 2011-08-24 | 彬县水帘洞煤炭有限责任公司 | Arrangement method for gas drainage drill sites of highly-gassy fully-mechanized top-coal caving surface |
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| CN102518464A (en) * | 2011-12-09 | 2012-06-27 | 中国神华能源股份有限公司 | Method for extracting gas at corner on recovery working face in coal mine |
| CN101575983B (en) * | 2009-02-27 | 2012-07-04 | 河南省煤层气开发利用有限公司 | Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof. |
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| CN110219592A (en) * | 2019-05-27 | 2019-09-10 | 中国矿业大学(北京) | A kind of cubic network destressing borehole method for arranging for realizing the abundant release of high seam |
| CN114592828A (en) * | 2021-11-26 | 2022-06-07 | 重庆大学 | Multi-asymmetric mining coal bed gas secondary reservoir boundary determination and combined extraction method |
| CN114704251A (en) * | 2022-03-31 | 2022-07-05 | 国网能源新疆准东煤电有限公司 | Method for evaluating danger of hydraulic fracturing pressure relief impact of coal mining face |
Families Citing this family (1)
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|---|---|---|---|---|
| US4320627A (en) * | 1979-10-20 | 1982-03-23 | Air Products And Chemicals, Inc. | Apparatus for recovering natural gas in a mine |
| US4978172A (en) * | 1989-10-26 | 1990-12-18 | Resource Enterprises, Inc. | Gob methane drainage system |
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| CN106761902A (en) * | 2016-12-06 | 2017-05-31 | 安徽理工大学 | A kind of stereo synthesis pressure relief gas pumping mining method suitable for soft rock protective coat extracted |
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| CX01 | Expiry of patent term |
Granted publication date: 20071219 |