CN103775127B - A kind of low-permeable high gas layer group topping Comprehensive Gas Control method - Google Patents
A kind of low-permeable high gas layer group topping Comprehensive Gas Control method Download PDFInfo
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Abstract
A kind of low-permeable high gas layer group topping Comprehensive Gas Control method, belongs to coal mine gas control method.Gas pressure relief Emission Law when this comprehensive processing method is exploited based on up-protective layer under low-permeable high methane coal seam group with near interval condition, builds up-protective layer coal and gas power phenomenon system, comprising: topping and protected seam gas pumping.Topping gas pumping comprises this coal bed gas extraction of topping, the high-order drilling holes at the drilling yard gas pumping of top board, stays lane body of wall pipe laying goaf gas extraction; Protected seam gas pumping is that coal-bed gas is taken out in advance.And then realize the safe and efficient back production of up-protective layer under low-permeable high methane coal seam group with near interval condition.This exploitation method is simple, reliable and stable, and Social benefit and economic benefit is remarkable, for the safety and reliability improving the measure of control coal mine gas disaster, improves coal mining environment, the safe condition improving work plane and efficiency, significant.
Description
Technical field
The present invention relates to a kind of coal mine gas control method, specifically a kind of low-permeable high gas layer group topping Comprehensive Gas Control method.
Background technology
In recent years, coal bed gas extraction technology obtains develop rapidly, and is successfully combined with protective coat extracted, defines protective coat extracted and protected seam pressure relief gas pumping mining technology.Mining Practice for many years proves; protective coat extracted and protected seam release art prevent and treat one of effective, the most most economical regional measure of coal and gas prominent; the state that this technology not only can be avoided for a long time and dangerous seam with potential is fought at close quarters, and the safety and reliability that improve the measure of control coal and gas prominent.For this reason, protective coat extracted and protected seam pressure relief gas pumping mining technology by different laws and regulations, are decided to be the mandatory first-selected protrusion-dispelling technology of current dangerous seam with potential group exploitation by successively by coal supervision department.Along with the development of colliery fully mechanized coal winning technology, the advance of the face is accelerated, gas emission sharply increases, and gas has become the key factor of some mine safety high-efficiency mining of restriction. and gas is a kind of gas with strong greenhouse effect, and greenhouse effect are about CO
221 times, a large amount of discharges will cause serious environmental problem, but gas is again a kind of clean, the energy efficiently, on calorific value, gas and conventional gas quite, every 1000m
3pure gas is equivalent to the standard coal of 1t fuel oil or 1.25t. China highly gassy mine ton coal gas bearing capacity average out to 6 ~ 10m
3, gas resources is enriched, and powerful drive mash gas resource both can improve the utilization rate of resource, can improve again the safety of coal mining, and is conducive to improving global atmosphere environment.Therefore, how safe and efficient extraction high methane coal mine gas resource, realizes that coal and non-coal is safe and efficient to be adopted altogether, is target and the direction of domestic and international many scholar's research.
Summary of the invention
Technical problem: in order to overcome deficiency of the prior art; the invention provides a kind of productivity effect, safety and reliability is good, the method for a kind of low-permeable high gas layer group topping Comprehensive Gas Control of ground gas permeability high methane coal seam group with near interval pressure-relief outburst-prevention, topping and protected seam coal and gas power phenomenon can be realized.
Technical scheme: object of the present invention is achieved through the following technical solutions: gas pressure relief Emission Law when exploiting based on up-protective layer under low-permeable high methane coal seam group with near interval condition, build up-protective layer coal and gas power phenomenon system, the described system of adopting altogether comprises: topping and protected seam gas pumping; Topping gas pumping comprises this coal bed gas extraction of topping, the high-order drilling holes at the drilling yard gas pumping of top board, stays lane body of wall pipe laying goaf gas extraction, and described protected seam gas pumping is that coal-bed gas is taken out in advance; Concrete method is as follows:
One, this coal bed gas extraction of topping is arranged
1) horizontal bore form gas pumping is arranged
Return airway is adopted side from 900m place, is arranged No. 1 boring, boring vertical working is arranged, the spacing of wells is 9m, until terminate apart from protection coal pillar 50m place, large lane, be+1 ° with the elevation angle upwards to drill, drilling depth is 80m, and the elevation angle of holing in work progress is determined according to field geology conditions, and elevation angles scope is at 0 ~ 90 °;
2) drill site fan drilling form gas pumping is arranged
At the 900m place of return airway inward to open-off cut, adopt side and transportation roadway and adopt side and arrange a drill site every 50m, each drill site arranges 8 borings; Return airway adopts side boring open height 1.2m, and with+1 ° of angle along drilling in coal, hole depth is 80m; Dip angle of hole and perforate inclination angle are according to seam inclination, reality in work progress, according to coal seam change adjustment bore angle, Field Force guarantees that drilling construction is in coal seam;
Two, the high-order drilling holes at the drilling yard gas pumping of top board is arranged
In transportation roadway, utilize existing, fissure zone boring on one group of respectively constructing apart from nearest two drill sites of work plane, construct altogether in drill site 5 and hole, in fan-shaped layout, No. 1 ~ No. 5 borings arrange from left to right successively, whole hole horizontal spacing of holing is 15m, and according to fissure zone development height analysis result, fissure zone whole hole of holing sets by 8 ~ 10 times of mining height 13 ~ 16m; The dark 3m of drill site, spacing of wells 0.6m, the intersection opening helped at top board and tunnel coal of holing.
The aperture of boring is 50mm, and sealing of hole, reaming length are 9m, and sealing of hole adopts the polyethylene pipe of the flanged dish of 50mm, cementing; Be connected with main line and adopt Sunken wire tube, valve and tailrace are installed in main line threeway place, so as extraction observational record, adjustment extraction parameter and discharging water;
Three, lane body of wall pipe laying goaf gas extraction is stayed to arrange
Stay in the obturation of lane at interval of reserved one 4 writing brushes of 9m in transportation roadway, and connect with flange Sunken wire tube, stretch out body of wall 0.5m, staying in the work progress of lane, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipe adopting side in peephole and tunnel, and are received and realize goaf gas extraction to rear portion, work plane goaf by non-for gob side entry retaining side ф 320 releasing pipe of adopting;
Goaf pipe laying extraction, by the direct extraction goaf gas of installation pipeline, reduces goaf gas as far as possible and flows into work plane; Generally, goaf pipe laying diameter 75mm ~ 100mm, one end length be in exploiting field can be determined according to scene; Tube wall is installed with aperture and wraps with husky net, prevents from blocking in extraction process; This pipe should be tried one's best near top, coal seam, is in the place that gas density is higher;
Four, protected seam coal-bed gas takes out layout in advance
Traverse 77m place to cutting eye in protected seam return aircourse apart from two, the right side in tunnel arranges topping gas pumping drill site; No. 1 drill site, traversing 77m place apart from two, with No. 2 drill site spacing 50m, arranges 9 borings; No. 2 drill sites, to No. 7 each drill site spacing 50m of drill site, arrange 5 holes at No. 2 drill sites to No. 7 each drill sites of drill site; No. 7 drill sites are to No. 9 each drill site spacing 40m of drill site, and No. 9 drill sites, to No. 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill sites arrange 5 borings, and No. 10 drill sites arrange 6 borings; No. 10 drill sites, to No. 26 each drill site spacing 50m of drill site, arrange 5 borings at each drill site;
Drilling target orientation is 359 °, and each drill site open interior spacing is about 1m, the spacing of wells is 10m, and the single hole degree of depth is 340m, and bore angle and opening inclination angle will adjust according to seam inclination, the change of actual drill site; Boring aperture is 96mm, and sealing of hole, reaming length are 9m, and counter bore diameter is 150mm, and hole sealing tube adopts 4 cun of pvc pipes, No. 425 cementings.
Beneficial effect: owing to have employed such scheme; determine the method that low-permeable high gas layer group topping comprehensive gas is placed; and gas pressure relief Emission Law when exploiting according to up-protective layer under low-permeable high methane coal seam group with near interval condition; construct up-protective layer coal and gas power phenomenon system, realize the pressure-relief outburst-prevention of low-permeable high methane coal seam group with near interval, topping and protected seam coal and non-coal is safe and efficient adopts altogether.Solve gas permeability high methane coal seam group with near interval pressure-relief outburst-prevention, topping and the safe and efficient problem of adopting altogether of protected seam coal and non-coal; this exploitation method is simple; reliable and stable; Social benefit and economic benefit is remarkable; for the safety and reliability improving the measure of control coal mine gas disaster; improve coal mining environment, the safe condition improving work plane and efficiency, significant.
Accompanying drawing explanation
Fig. 1 is topping coal and gas power phenomenon system figure of the present invention.
Fig. 2 is this coal bed gas extraction of topping arrangement diagram of the present invention.
Fig. 3 is top board of the present invention high-order drilling holes at the drilling yard gas pumping arrangement diagram.
Fig. 4 of the present inventionly stays lane body of wall pipe laying goaf gas extraction arrangement diagram.
Fig. 5 is that protected seam coal-bed gas of the present invention takes out plane of arrangement figure in advance.
Fig. 6 is that protected seam coal-bed gas of the present invention takes out layout sectional view in advance.
In figure, 1, return airway; 2, transportation roadway; 3, open-off cut; 4, horizontal bore; 5, drill site fan drilling; 6, this coal seam drill site of topping; 7, the high-order drill site of top board; 8, the high-order drilling holes at the drilling yard of top board; 9, topping work plane; 10, gob side entry retaining filling wall; 11, lane body of wall pipe laying is stayed; 12, gob side entry retaining; 13, protected seam return airway; 14, protected seam km directional drilling; 15, protected seam takes out drill site in advance.
Detailed description of the invention
1 ~ Fig. 6 is described the concrete implementation step of the present invention by reference to the accompanying drawings:
Embodiment 1: gas pressure relief Emission Law when exploiting based on up-protective layer under the low-permeable high methane coal seam group with near interval condition of Sha Qu ore deposit, constructs up-protective layer coal and gas power phenomenon system, mainly comprise topping and protected seam gas pumping.Topping gas pumping comprises this coal bed gas extraction of topping, the high-order drilling holes at the drilling yard gas pumping of top board, stays lane body of wall pipe laying goaf gas extraction, secondly carries out coal-bed gas to protected seam and takes out in advance.Concrete grammar is as follows:
One, this coal bed gas extraction of topping is arranged
1) horizontal bore form gas pumping
22201 assistant conveyance lanes 1 are adopted side from 900m place, are arranged No. 1 boring 4,4 vertical workings of holing are arranged, 4 spacing of holing are 9m, until terminate apart from protection coal pillar 50m place, large lane, be+1 ° with the elevation angle and upwards drill, 4 degree of depth of holing are 80m, 4 elevations angle of holing in work progress are determined according to field geology conditions, elevation angles scope, at 0 ~ 90 °, ensures that elevation angle deslagging of upwards drilling is easy, not ponding in hole; Boring 4 always construction number is 81, and total footage is 6480m.
2) drill site fan drilling form gas pumping is arranged
At 22201 assistant conveyance lane 1(900m inward to open-off cut) adopt side and 22201 machine rails unification lane 2 adopt side arrange a drill site 6 every 50m, arrange 38 drill sites 6 altogether, each drill site 6 arranges 8 borings 5, machine rail unification lane 2 and assistant conveyance lane 1 drill site 6 are constructed this coal bed drilling 304 altogether, and total footage is 24320m.
Side boring 4 open height 1.2m is adopted in assistant conveyance lane 1, and with+1 ° of angle along drilling in coal, hole depth is 80m.Hole 4 inclination angles and perforate inclination angle according to seam inclination, actual in work progress, and Field Force can suitably adjust boring (4) angle according to coal seam change and guarantee that drilling construction is in coal seam.
Two, the high-order drilling holes at the drilling yard gas pumping of top board is arranged
In 22201 machine rail unification lanes 2, utilize two existing, nearest apart from work plane drill sites 7, i.e. fissure zone boring 8 on the machine rail unification left side 25 in lane 2 drill site (1450m) and each construction one group of 24 drill sites (1400m), construct altogether in drill site 75 and hole, in fan-shaped layout, No. 1 ~ No. 5 borings 8 arrange from left to right successively, and boring 8 whole hole horizontal spacing are 15m, according to fissure zone development height analysis result, fissure zone whole hole of holing is designed by 8 ~ 10 times of mining heights (13 ~ 16m).Drill site 7 dark 3m, spacing of wells 0.6m, the intersection opening (suitably can adjust according to site specific) that boring 8 is helped at top board and tunnel coal.
Boring 8 construction adopts ZYG-150 type rig, and aperture is 50mm, and sealing of hole, reaming length are 9m, and sealing of hole adopts the polyethylene pipe of the flanged dish of 50mm, cementing.Be connected with main line and adopt Sunken wire tube, valve and tailrace are installed in main line threeway place, so as extraction observational record, adjustment extraction parameter and discharging water.
Three, lane body of wall pipe laying goaf gas extraction is stayed
Stay in lane 12 obturation 10 at interval of reserved one 4 writing brushes of 9m 22201, and connect with flange Sunken wire tube, stretch out body of wall 0.5m, staying in the work progress of lane 12, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipe adopting side in peephole and tunnel, and are received and realize goaf gas extraction to 22201 rear portions, work plane goaf by non-for gob side entry retaining side ф 320 releasing pipe of adopting.
Goaf pipe laying 11 extraction, by the direct extraction goaf gas of installation pipeline, reduces goaf gas as far as possible and flows into work plane.Generally, goaf pipe laying diameter 75mm ~ 100mm, one end length be in exploiting field can be determined according to scene.Tube wall is installed with aperture and wraps with husky net, prevents blockage phenomenon in extraction process.This pipe should be tried one's best near top, coal seam, is in the place that gas density is higher.
Five, protected seam carries out coal-bed gas and takes out in advance
Traverse 77m place to cutting eye in 24208 assistant conveyance lanes 13 apart from two, the right side in tunnel offers topping extraction drill site 1526.No. 1 drill site, traversing 77m place apart from two, with No. 2 drill site spacing 50m, arranges 9 borings.No. 2 drill sites, to No. 7 each drill site spacing 50m of drill site, arrange 5 holes at No. 2 drill sites to No. 7 each drill sites of drill site.No. 7 drill sites are to No. 9 each drill site spacing 40m of drill site, and No. 9 drill sites, to No. 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill sites arrange 5 borings, and No. 10 drill sites arrange 6 borings.No. 10 drill sites, to No. 26 each drill site spacing 50m of drill site, arrange 5 borings at each drill site.
14 target bearings of holing are 359 °, and each drill site 15 open interior spacing is about 1m, 14 spacing of holing are 10m, and the single hole degree of depth is 340m, and 14 angles of holing and opening inclination angle will adjust according to seam inclination, the change of actual drill site.14 apertures of holing are 96mm, and sealing of hole, reaming length are 9m, and counter bore diameter is 150mm, and hole sealing tube adopts 4 cun of pvc pipes, No. 425 cementings.
Claims (1)
1. a low-permeable high gas layer group topping Comprehensive Gas Control method, it is characterized in that: gas pressure relief Emission Law when exploiting based on up-protective layer under low-permeable high methane coal seam group with near interval condition, build up-protective layer coal and gas power phenomenon system, the described system of adopting altogether comprises: topping and protected seam gas pumping; Described topping gas pumping comprises this coal bed gas extraction of topping, the high-order drilling holes at the drilling yard gas pumping of top board, stays lane body of wall pipe laying goaf gas extraction, and described protected seam gas pumping is that coal-bed gas is taken out in advance; Concrete method is as follows:
One, this coal bed gas extraction of topping is arranged
1) horizontal bore form gas pumping is arranged
Return airway is adopted side from 900m place, is arranged No. 1 boring, boring vertical working is arranged, the spacing of wells is 9m, until terminate apart from protection coal pillar 50m place, large lane, be+1 ° with the elevation angle upwards to drill, drilling depth is 80m, and (4) elevation angle of holing in work progress is determined according to field geology conditions, and elevation angles scope is at 0 ~ 90 °;
2) drill site fan drilling form gas pumping is arranged
At the 900m place of return airway inward to open-off cut, adopt side and transportation roadway and adopt side and arrange a drill site every 50m, each drill site arranges 8 borings; Return airway adopts side boring open height 1.2m, and with+1 ° of angle along drilling in coal, hole depth is 80m; The boring elevation angle and the perforate elevation angle are determined according to seam inclination, actual in work progress, according to coal seam change adjustment bore angle, Field Force guarantees that drilling construction is in coal seam;
Two, the high-order drilling holes at the drilling yard gas pumping of top board is arranged
In transportation roadway, utilize existing, fissure zone boring on one group of respectively constructing apart from nearest two drill sites of work plane, construct altogether in drill site 5 and hole, in fan-shaped layout, No. 1 ~ No. 5 borings arrange from left to right successively, whole hole horizontal spacing of holing is 15m, and according to fissure zone development height analysis result, fissure zone whole hole of holing sets by 8 ~ 10 times of mining height 13 ~ 16m; The dark 3m of drill site, spacing of wells 0.6m, the intersection opening helped at top board and tunnel coal of holing;
The aperture of boring is 50mm, and sealing of hole, reaming length are 9m, and sealing of hole adopts the polyethylene pipe of the flanged dish of 50mm, cementing; Be connected with main line and adopt Sunken wire tube, valve and tailrace are installed in main line threeway place, so as extraction observational record, adjustment extraction parameter and discharging water;
Three, lane body of wall pipe laying goaf gas extraction is stayed to arrange
Stay in the obturation of lane at interval of reserved one 4 writing brushes of 9m in transportation roadway, and connect with flange Sunken wire tube, stretch out body of wall 0.5m, staying in the work progress of lane, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipe adopting side in peephole and tunnel, and are received and realize goaf gas extraction to rear portion, work plane goaf by non-for gob side entry retaining side ф 320 releasing pipe of adopting;
Goaf pipe laying extraction, by the direct extraction goaf gas of installation pipeline, reduces goaf gas as far as possible and flows into work plane; Goaf pipe laying diameter 75mm ~ 100mm, one end length be in exploiting field can be determined according to scene; Pipe laying tube wall is installed with aperture and wraps with husky net, prevents from blocking in extraction process; This pipe laying should be tried one's best near top, coal seam, is in the place that gas density is higher;
Four, protected seam coal-bed gas takes out layout in advance
Traverse 77m place to cutting eye at protected seam return airway apart from two, the right side in tunnel arranges topping gas pumping drill site; No. 1 drill site, traversing 77m place apart from two, with No. 2 drill site spacing 50m, arranges 9 borings; No. 2 drill sites, to No. 7 each drill site spacing 50m of drill site, arrange 5 holes at No. 2 drill sites to No. 7 each drill sites of drill site; No. 7 drill sites are to No. 9 each drill site spacing 40m of drill site, and No. 9 drill sites, to No. 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill sites arrange 5 borings, and No. 10 drill sites arrange 6 borings; No. 10 drill sites, to No. 26 each drill site spacing 50m of drill site, arrange 5 borings at each drill site;
Drilling target orientation is 359
o, each drill site open interior spacing is 1m, the spacing of wells is 10m, and the single hole degree of depth is 340m, and bore angle and opening inclination angle will adjust according to seam inclination, the change of actual drill site; Boring aperture is 96mm, and sealing of hole, reaming length are 9m, and counter bore diameter is 150mm, and hole sealing tube adopts 4 cun of pvc pipes, No. 425 cementings.
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