CN103362541A - Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability - Google Patents
Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability Download PDFInfo
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- CN103362541A CN103362541A CN201310339829XA CN201310339829A CN103362541A CN 103362541 A CN103362541 A CN 103362541A CN 201310339829X A CN201310339829X A CN 201310339829XA CN 201310339829 A CN201310339829 A CN 201310339829A CN 103362541 A CN103362541 A CN 103362541A
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Abstract
The invention relates to a method for locally improving coal seam air permeability in a coal seam with high gas and low air permeability. A plurality of water discharging drilled holes are constructed in a water containing stratum from a rock tunnel and after the construction of the water discharging drilled holes, the holes are sealed through metal casing pipes and cement; water discharged from the water discharging drilled holes flows into a water bin through a ditch of a bottom board of the tunnel and the water is discharged at regular time; the water in the water containing stratum is discharged, so that the stress exerted on an adjacent coal stratum is reduced, new cracks are generated in the adjacent coal stratum, the air permeability of the coal seam with high gas and low air permeability on the upper portion is forced to be improved, and therefore the gas extraction effect of the coal seam with high gas and low air permeability is improved. With regard to a mine with the water containing stratum contained in the bottom board of the coal seam, the rock tunnel is constructed in the lower portion of the water containing stratum, the water discharging drilled holes are constructed in the water containing stratum from the rock tunnel, so that the water in the stratum is discharged, the stress exerted on the water containing stratum and the adjacent coal stratum is reduced, the cracks are generated, therefore, the air permeability of the coal seam on the upper portion is improved, and favorable conditions are created for coal seam gas extraction.
Description
Technical field
The present invention relates to increase the gas permeability of coal seam method, the regional method that increases gas permeability of coal seam of the high gassy and low permeability coal seam of depositing water-bearing stratum is composed in especially a kind of high gassy and low permeability coal seam below that is applicable to.
Background technology
The most of high Coal Seam Prone To Outburst gas permeability of China is very low, is unfavorable for gas pumping, needs to carry out the coal seam anti-reflection before drainage from coal seam, transforms gas permeability of coal seam, for the gas pumping in coal seam creates conditions.Present anti-reflection technology mainly comprises layer interior technology and the outer technology two large class of layer, and technology comprises the anti-reflection technology such as fracturing, hydraulic slotted liner technique, hydraulic flushing in hole in the layer, and the outer technology of layer is mainly topping and exploits anti-reflection technology.
All compose the Seam Roof And Floor position of a lot of highly gassy mines of China has the aquifer.For preventing the generation of water inrush accident, before seam mining, need the aquifer is discharged water.Find in practice not only to have eliminated the work plane flood by water-bearing stratum is discharged water, and the gas permeability in coal seam also enlarges markedly, the coal bed gas extraction effect significantly improves.
By analysis, after the contiguous aquifer in coal seam discharged water, the gas permeability in coal seam increased, and its mechanism is identical with the gas permeability mechanism of topping exploitation increase protected seam.After the topping exploitation, because strata movement, stress reduction, cranny development are so that protected seam obtains the release antireflective effect.In like manner, water-bearing stratum just looks like topping, and the process that water-bearing stratum discharges water is equivalent to the process of topping exploitation.Water composes that to exist in the rock stratum be spacial, the space that in the rock stratum, reserves after the rock stratum discharges water, and for the movement and deformation of top coal rock layer provides the space, this space is with respect to the goaf of topping work plane.Both differences are the limited spaces that stays after discharging water, and the topping goaf is very large, is conducive to the movement and deformation of rock stratum, top.But the aquifer in the coal measure strata is very thick, some reaches tens meters, therefore the space that stays after the aquifer being discharged water can be so that superjacent has enough dilatancy, for movement and deformation, the stress of superjacent reduces and the gas permeability increase provides enough spaces.
After water-bearing stratum discharged water, the gas permeability of coal seam on top significantly increased, and then carried out gas pumping to the coal seam construction drill, but decrease borehole engineering amount and gas pumping time, and can guarantee good gas pumping effect.
Summary of the invention
Technical problem: the objective of the invention is to compose for the low air permeability coal seam base plate and deposit the aquifer condition, provide a kind of method high gassy and low permeability coal seam simple, easy to operate, that improve the gas pumping effect the regional method that increases gas permeability of coal seam.
Technical scheme: the regional method that increases gas permeability of coal seam of high gassy and low permeability coal seam of the present invention comprises the steps:
A. at first below the corresponding water-bearing stratum of high gassy and low permeability coal seam the construction at least one stone head;
B. from stone head to a plurality of borings that discharge water of water-bearing stratum construction, bore diameter is not less than 90mm,
C. adopt metal sleeve and cement to carry out sealing of hole after the drilling construction that discharges water finishes, and in the aperture by-pass valve control is installed;
D., sump is set in stone head, and suction pump is installed, the water that the boring that discharges water is emitted flows into sump through the ditch of roadway floor, regularly carries out draining;
E. along with to the discharging water of water-bearing stratum, so that the stress of contiguous coal rock layer reduces, produce new crack in the contiguous coal rock layer, force the high gassy and low permeability coal seam gas permeability on top to increase, thereby improve the gas pumping effect of high gassy and low permeability coal seam.
The position that the rock stratum discharges water should be selected to be conducive in the position of described stone head, and the section of stone head is not less than 12m
2The spacing of wells of a plurality of borings that discharge water of described construction is determined according to water-bearing stratum thickness and the radius that discharges water.
Beneficial effect: owing to having adopted technique scheme, carry out coal seam below and compose the anti-reflection of the regional coal seam of high gassy and low permeability coal seam of depositing water-bearing stratum, can improve gas permeability of coal seam more than 300 times, the extraction borehole engineering quantity reduces more than 2/3rds, and extraction is short more than one times.For composing the mine deposit water-bearing stratum in seat earth, the stone head of can construct from the rock stratum, bottom in aquifer to the water-bearing stratum construction boring that discharges water, is determined the spacing of wells according to the radius that discharges water of holing from this tunnel.After water in the rock stratum discharged, can be so that water-bearing stratum and contiguous coal rock layer stress reduce, cranny development, and then so that the gas permeability of coal seam on top increase, for coal bed gas extraction creates favorable conditions.The present invention can improve gas permeability of coal seam now, for the efficient extraction of high Coal Seam Prone To Outburst gas creates conditions.It is simple in structure, and is easy to operate, and engineering quantity is little, effective, has widely practicality.
Description of drawings
Fig. 1 is the method schematic diagram that rock stratum of the present invention draining increases gas permeability of coal seam.
Among the figure: 1-high gassy and low permeability coal seam; 2-water-bearing stratum; 3-stone head; 4-boring discharges water; 5-crack; 6-other rock stratum.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
The regional method that increases gas permeability of coal seam of high gassy and low permeability coal seam of the present invention, construction at least one stone head 3 below the corresponding water-bearing stratum 2 of high gassy and low permeability coal seam 1 at first, determine according to on-site actual situations, Figure 1 shows that a stone head 3, at the stone head 3 interior sump that arrange, and the installation suction pump, should the selecting of described stone head 3 positions is conducive to the rock stratum and discharges water, and drift section is not less than 12m
2Then hole 4 to a plurality of the discharging water of water-bearing stratum 2 directions construction different angles from stone head 3, bore diameter is not less than 90mm, and the spacing of wells of a plurality of borings 4 that discharge water of described construction is determined according to water-bearing stratum thickness and the radius that discharges water.Discharging water needs to adopt metal sleeve and cement to carry out sealing of hole after boring 4 constructions finish, and by-pass valve control is installed in the aperture, can regulate and start or stop according to water yield size.After last water-bearing stratum 2 large tracts of land discharge water, need to from stone head 31 construction investigation boring to the coal seam, carry out the investigation of gas permeability of coal seam, for the spacing of extraction borehole in the later stage coal seam determines to provide foundation.A plurality of borings 4 that discharge water are passed other rock stratum 6 and are entered the aquifer, and the water that the boring that discharges water is emitted flows into sump through the ditch of roadway floor, regularly carry out draining.Along with to the discharging water of water-bearing stratum 2, so that the stress of contiguous coal rock layer reduces, produce new crack 5 in the contiguous coal rock layer, force high gassy and low permeability coal seam 1 gas permeability on top to increase, thereby improve the gas pumping effect of high gassy and low permeability coal seam 1.
Claims (3)
1. the regional method that increases gas permeability of coal seam of high gassy and low permeability coal seam is characterized in that comprising the steps:
A. at first at corresponding water-bearing stratum (2) below construction at least one stone head (3) of high gassy and low permeability coal seam (1);
B. from stone head (3) to a plurality of borings (4) that discharge water of water-bearing stratum (2) construction, bore diameter is not less than 90mm,
C. adopt metal sleeve and cement to carry out sealing of hole after the boring (4) that discharges water construction finishes, and in the aperture by-pass valve control is installed;
D. in stone head (3) sump is set, and suction pump is installed, the water that the boring (4) that discharges water is emitted flows into sump through the ditch of roadway floor, regularly carries out draining;
E. along with discharging water to water-bearing stratum (2), so that the stress of contiguous coal rock layer reduces, produce new crack (5) in the contiguous coal rock layer, force high gassy and low permeability coal seam (1) gas permeability on top to increase, thereby improve the gas pumping effect of high gassy and low permeability coal seam (1).
2. high gassy and low permeability coal seam regionality according to claim 1 increases the method for gas permeability of coal seam, and it is characterized in that: the position that the rock stratum discharges water should be selected to be conducive in the position of described stone head (3), and the section of stone head (3) is not less than 12m
2
3. high gassy and low permeability coal seam regionality according to claim 1 increases the method for gas permeability of coal seam, it is characterized in that: the spacing of wells of a plurality of borings (4) that discharge water of described construction is determined according to water-bearing stratum thickness and the radius that discharges water.
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| CN201310339829.XA CN103362541B (en) | 2013-08-07 | 2013-08-07 | High gassy and low permeability coal seam regionality increases the method for gas permeability of coal seam |
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| CN201310339829.XA CN103362541B (en) | 2013-08-07 | 2013-08-07 | High gassy and low permeability coal seam regionality increases the method for gas permeability of coal seam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533511A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating coal and gas outburst in coal roadway heading process |
| CN104533512A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating gas outburst in coal roadway heading process |
| CN105673065A (en) * | 2016-01-12 | 2016-06-15 | 西安科技大学 | Method for pressure relief gas extraction of high-gas outburst coal seam |
| CN106014474A (en) * | 2016-05-17 | 2016-10-12 | 陕西正通煤业有限责任公司 | Three-hole combined construction method meeting requirements of downhole pressure releasing, water draining and prospecting and gas drainage |
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| CN1534164A (en) * | 2003-03-28 | 2004-10-06 | 淮南矿业(集团)有限责任公司 | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| CN101144389A (en) * | 2007-04-06 | 2008-03-19 | 中国矿业大学 | Gridding type layer-through drilling pore group permeability-increasing gas pumping method |
| CN102116169A (en) * | 2011-01-27 | 2011-07-06 | 中国矿业大学 | Drainage method for pressure-relief gas baseboard stonehead of protected seam |
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2013
- 2013-08-07 CN CN201310339829.XA patent/CN103362541B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1534164A (en) * | 2003-03-28 | 2004-10-06 | 淮南矿业(集团)有限责任公司 | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| CN101144389A (en) * | 2007-04-06 | 2008-03-19 | 中国矿业大学 | Gridding type layer-through drilling pore group permeability-increasing gas pumping method |
| CN102116169A (en) * | 2011-01-27 | 2011-07-06 | 中国矿业大学 | Drainage method for pressure-relief gas baseboard stonehead of protected seam |
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| 黄华州: "远距离被保护层卸压煤层气地面井开发地质理论及其应用研究——以淮南矿区为例", 《博士学位论文》, 2 December 2010 (2010-12-02) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533511A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating coal and gas outburst in coal roadway heading process |
| CN104533512A (en) * | 2014-12-16 | 2015-04-22 | 中鼎国际工程有限责任公司 | Construction method for preventing and treating gas outburst in coal roadway heading process |
| CN105673065A (en) * | 2016-01-12 | 2016-06-15 | 西安科技大学 | Method for pressure relief gas extraction of high-gas outburst coal seam |
| CN105673065B (en) * | 2016-01-12 | 2017-12-22 | 西安科技大学 | A kind of projecting coal bed pressure relief gas pumping mining method of high methane |
| CN106014474A (en) * | 2016-05-17 | 2016-10-12 | 陕西正通煤业有限责任公司 | Three-hole combined construction method meeting requirements of downhole pressure releasing, water draining and prospecting and gas drainage |
| CN106014474B (en) * | 2016-05-17 | 2018-06-01 | 陕西正通煤业有限责任公司 | Meet underground release, leting speeper, gas drainage under suction three holes and use construction method |
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| CN103362541B (en) | 2015-11-04 |
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