CN103775127A - Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group - Google Patents
Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group Download PDFInfo
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Abstract
The invention provides a method for comprehensively treating gas in a low-air-permeability high-gas-content coal seam group and belongs to a coal mine gas treatment method. The method for comprehensively treating gas is based on the pressure relief gas emission law when an upper protective seam is extracted under the condition of the low-air-permeability high-gas-content close-distance coal seam group and a coal and gas simultaneous extraction system of the upper protective seam is established. The method comprises the steps of protective seam gas extraction and protected seam gas extraction. Protective seam gas extraction comprises the steps of protective seam gas extraction, roof high-position drilling site and drilling gas extraction and gas extraction of a reserved-tunnel wall laid-pipe goaf. Protected seam gas extraction is seam gas pre-extraction. Thus, safe and efficient recovery of the upper protective seam under the condition of the low-air-permeability high-gas-content close-distance coal seam group is achieved. The method for extraction is simple, stable, reliable and remarkable in social and economic benefit and has great significance in the improvement in safety and reliability of coal mine gas disaster prevention measures, the coal extraction environment and the safety condition and efficiency of a working face.
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 has obtained develop rapidly, and exploits successful combination with topping, has formed topping exploitation and protected seam pressure relief gas pumping mining technology.Mining Practice for many years proves; topping exploitation and protected seam release art are one of effective, the most most economical regional measures of control coal and Gas Outburst; this technology not only can be avoided state long-term and dangerous seam with potential point-blank encounter, and has improved the safety and reliability of control coal and Gas Outburst measure.For this reason, coal supervision department by different laws and regulations, is decided to be by topping exploitation and protected seam pressure relief gas pumping mining technology the mandatory first-selected protrusion-dispelling technology that current dangerous seam with potential group exploits by priority.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, still, gas is again a kind of clean, the energy efficiently, on calorific value, gas and conventional gas are suitable, 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 abundant, and powerful drive mash gas resource both can improve the utilization rate of resource, can improve again the safety of coal mining, and was conducive to improve global atmosphere environment.Therefore, the how high fiery colliery gas resources of safe and efficient extraction, realizes coal and gas safety is efficiently 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, can realize the method for a kind of low-permeable high gas layer group topping Comprehensive Gas Control of adopting altogether of the high gas coal seam group with near interval of ground gas permeability pressure-relief outburst-prevention, topping and protected seam coal and gas.
Technical scheme: object of the present invention is achieved through the following technical solutions: based on gas pressure relief Emission Law when upper topping exploitation under the high gas coal seam group with near interval of low-permeable condition, on structure, topping coal and gas are adopted system altogether, and 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) parallel boring form gas pumping is arranged
Return airway is adopted side and is started to arrange No. 1 boring from 900m, boring vertical working is arranged, the spacing of wells is 9m, until protection coal column 50m place, Ju great lane finishes, take the elevation angle as+1 ° is upwards drilled, drilling depth is 80m, and determine according to on-the-spot geological conditions at the elevation angle of holing in work progress, and elevation angle angular range is at 0～90 °;
2) drill site fan drilling form gas pumping is arranged
, adopt side and transportation lane and adopt side and arrange a drill site every 50m inward to open-off cut at the 900m place of return airway, each drill site is arranged 8 borings; Return airway is adopted the boring open height 1.2m of side, 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, actual in work progress, and Field Force changes adjustment bore angle according to coal seam and 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 lane, utilize existing, apart from fissure zone boring in one group of the each construction of nearest two drill sites of work plane, 5 borings of constructing altogether in drill site, be fan-shaped layout, No. 1～No. 5 boring arranges from left to right successively, the whole hole horizontal spacing of holing is 15m, and according to fissure zone development height analysis result, the fissure zone whole hole of holing is set by 8～10 times of mining height 13～16m; The dark 3m of drill site, spacing of wells 0.6m, boring is at the intersection opening of top board and tunnel coal side.
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, to extraction observational record, adjust extraction parameter and discharging water;
Three, stay lane body of wall pipe laying goaf gas extraction to arrange
In the obturation of transportation Xiang Liu lane, reserve one 4 writing brushes at interval of 9m, and connect with flange Sunken wire tube, stretch out body of wall 0.5m, in the work progress of Liu lane, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipes of adopting side in peephole and tunnel, and non-gob side entry retaining side ф 320 releasing pipes of adopting are received to rear portion, work plane goaf and realized goaf gas extraction;
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 being in exploiting field can be according to in-situ determination; Tube wall is installed with aperture and wraps with husky net, prevents from stopping up in extraction process; This pipe should be tried one's best near top, coal seam, in the higher place of gas density;
Four, protected seam coal-bed gas is taken out layout in advance
Traverse 77m place to cutting eye, the right side in tunnel layout topping gas pumping drill site in protected seam return aircourse apart from two; No. 1 drill site traverses 77m place in distance two, with No. 2 drill site spacing 50m, arranges 9 borings; No. 2 each drill site spacing of drill site to 7 drill site 50m, arrange 5 holes at No. 2 each drill sites of drill site to 7 drill site; No. 7 each drill site spacing of drill site to 9 drill site 40m, No. 9 drill site to 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill site is arranged 5 borings, and No. 10 drill site is arranged 6 borings; No. 10 each drill site spacing of drill site to 26 drill site 50m, arrange 5 borings at each drill site;
Boring target bearing is 359 °, and each drill site open interior spacing is that 1m left and right, the spacing of wells are 10m, and the single hole degree of depth is 340m, and bore angle and opening inclination angle will change and adjust according to seam inclination, 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 having adopted such scheme; determine the method that low-permeable high gas layer group topping comprehensive gas is placed; and according to gas pressure relief Emission Law when upper topping exploitation under the high gas coal seam group with near interval of low-permeable condition; build upper topping coal and gas and adopted altogether system, realized pressure-relief outburst-prevention, topping and protected seam coal and the gas safety of the high gas coal seam group with near interval of low-permeable and efficiently adopt altogether.Solve the problem that the high gas coal seam group with near interval of gas permeability pressure-relief outburst-prevention, topping and protected seam coal and gas safety are efficiently adopted altogether; this exploitation method is simple; reliable and stable; Social benefit and economic benefit is remarkable; for the safety and reliability that improves the measure of control coal mine gas disaster; improve safe condition and the efficiency of coal mining environment, raising work plane, significant.
Accompanying drawing explanation
Fig. 1 is that topping coal of the present invention and gas are adopted system figure altogether.
Fig. 2 is this coal bed gas extraction of topping arrangement diagram of the present invention.
Fig. 3 is the high-order drilling holes at the drilling yard gas pumping of top board of the present invention arrangement diagram.
Fig. 4 is the lane body of wall pipe laying goaf gas extraction arrangement diagram that stays of the present invention.
Fig. 5 is that protected seam coal-bed gas of the present invention is taken out plane of arrangement figure in advance.
Fig. 6 is that protected seam coal-bed gas of the present invention is taken out layout sectional view in advance.
In figure, 1, return airway; 2, transportation lane; 3, open-off cut; 4, parallel boring; 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, stay lane body of wall pipe laying; 12, gob side entry retaining; 13, protected seam return airway; 14, protected seam km directional drilling; 15, protected seam is taken out drill site in advance.
The specific embodiment
1～Fig. 6 describes the concrete implementation step of the present invention by reference to the accompanying drawings:
Embodiment 1: based on gas pressure relief Emission Law when upper topping exploitation under the high gas coal seam group with near interval of Sha Qu ore deposit low-permeable condition, built upper topping coal and gas and adopted altogether system, mainly comprised 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 protected seam is carried out to coal-bed gas and takes out in advance.Concrete grammar is as follows:
One, this coal bed gas extraction of topping is arranged
1) parallel boring form gas pumping
22201 assistant conveyance lanes 1 are adopted side and are started to arrange No. 1 boring 4 from 900m, 4 vertical workings of holing are arranged, 4 spacing of holing are 9m, until protection coal column 50m place, Ju great lane finishes, take the elevation angle as+1 ° is upwards drilled, boring 4 degree of depth are 80m, determine according to on-the-spot geological conditions at 4 elevations angle of holing in work progress, elevation angle angular range is at 0～90 °, guarantees that the elevation angle deslagging of upwards drilling is easy, ponding not in hole; The total construction number of boring 4 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 unifications lane 2 and adopt side and arrange a drill site 6 every 50m, arrange altogether 38 drill sites 6, each drill site 6 is arranged 8 borings 5, construct altogether 304 of this coal bed drillings of machine rail unification lane 2 and assistant conveyance lane 1 drill site 6, total footage is 24320m.
The boring 4 open height 1.2m of side are 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 change suitably adjustment boring (4) angle according to coal seam 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 existing, apart from two nearest drill sites 7 of work plane, hole 8 at machine rail unification lane 2 left side 25 drill sites (1450m) and 24 drill sites (1400m) fissure zone on a group of respectively constructing, interior 5 borings of constructing altogether of drill site 7, be fan-shaped layout, No. 1～No. 5 boring 8 arranges from left to right successively, and boring 8 whole hole horizontal spacing are 15m, according to fissure zone development height analysis result, the fissure zone whole hole of holing is designed by 8～10 times of mining heights (13～16m).The dark 3m of drill site 7, spacing of wells 0.6m, boring 8 is at the intersection opening (can suitably adjust according to site specific) of top board and tunnel coal side.
Boring 8 constructions adopt 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, to extraction observational record, adjust extraction parameter and discharging water.
Three, stay lane body of wall pipe laying goaf gas extraction
Stay in 12 obturations 10 of lane 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, in 12 work progresss of Liu lane, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipes of adopting side in peephole and tunnel, and non-gob side entry retaining side ф 320 releasing pipes of adopting are received to 22201 rear portions, work plane goaf and realized goaf gas extraction.
Pipe laying 11 extractions in goaf, by the direct extraction goaf gas of installation pipeline, reduce goaf gas as far as possible and flow into work plane.Generally, goaf pipe laying diameter 75mm～100mm, one end length being in exploiting field can be according to in-situ determination.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, in the higher place of gas density.
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 distances two, the right side in tunnel offers 1526 of topping extraction drill sites.No. 1 drill site traverses 77m place in distance two, with No. 2 drill site spacing 50m, arranges 9 borings.No. 2 each drill site spacing of drill site to 7 drill site 50m, arrange 5 holes at No. 2 each drill sites of drill site to 7 drill site.No. 7 each drill site spacing of drill site to 9 drill site 40m, No. 9 drill site to 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill site is arranged 5 borings, and No. 10 drill site is arranged 6 borings.No. 10 each drill site spacing of drill site to 26 drill site 50m, arrange 5 borings at each drill site.
14 target bearings of holing are 359 °, and each drill site 15 open interior spacing are that 1m left and right, boring 14 spacing are 10m, and the single hole degree of depth is 340m, and boring 14 angles and opening inclination angle will change and adjust according to seam inclination, 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: based on gas pressure relief Emission Law when upper topping exploitation under the high gas coal seam group with near interval of low-permeable condition, on structure, topping coal and gas are adopted system altogether, and 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) parallel boring form gas pumping is arranged
Return airway is adopted side and is started to arrange No. 1 boring from 900m, boring vertical working is arranged, the spacing of wells is 9m, until protection coal column 50m place, Ju great lane finishes, take the elevation angle as+1 ° is upwards drilled, drilling depth is 80m, and in work progress, determine according to on-the-spot geological conditions at boring (4) elevation angle, and elevation angle angular range is at 0～90 °;
2) drill site fan drilling form gas pumping is arranged
, adopt side and transportation lane and adopt side and arrange a drill site every 50m inward to open-off cut at the 900m place of return airway, each drill site is arranged 8 borings; Return airway is adopted the boring open height 1.2m of side, and with+1 ° of angle, along drilling in coal, hole depth is 80m; The boring elevation angle and the perforate elevation angle are according to seam inclination, actual in work progress, and Field Force changes adjustment bore angle according to coal seam and 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 lane, utilize existing, apart from fissure zone boring in one group of the each construction of nearest two drill sites of work plane, 5 borings of constructing altogether in drill site, be fan-shaped layout, No. 1～No. 5 boring arranges from left to right successively, the whole hole horizontal spacing of holing is 15m, and according to fissure zone development height analysis result, the fissure zone whole hole of holing is set by 8～10 times of mining height 13～16m; The dark 3m of drill site, spacing of wells 0.6m, boring is at the intersection opening of top board and tunnel coal side;
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, to extraction observational record, adjust extraction parameter and discharging water;
Three, stay lane body of wall pipe laying goaf gas extraction to arrange
In the obturation of transportation Xiang Liu lane, reserve one 4 writing brushes at interval of 9m, and connect with flange Sunken wire tube, stretch out body of wall 0.5m, in the work progress of Liu lane, each 4 writing brushes arrange a gate valve and are connected with non-ф 320 releasing pipes of adopting side in peephole and tunnel, and non-gob side entry retaining side ф 320 releasing pipes of adopting are received to rear portion, work plane goaf and realized goaf gas extraction;
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 being in exploiting field can be according to in-situ determination; Tube wall is installed with aperture and wraps with husky net, prevents from stopping up in extraction process; This pipe should be tried one's best near top, coal seam, in the higher place of gas density;
Four, protected seam coal-bed gas is taken out layout in advance
Traverse 77m place to cutting eye, the right side in tunnel layout topping gas pumping drill site at protected seam return airway apart from two; No. 1 drill site traverses 77m place in distance two, with No. 2 drill site spacing 50m, arranges 9 borings; No. 2 each drill site spacing of drill site to 7 drill site 50m, arrange 5 holes at No. 2 each drill sites of drill site to 7 drill site; No. 7 each drill site spacing of drill site to 9 drill site 40m, No. 9 drill site to 10 drill site spacing 69m, arrange 4 borings at No. 8 drill sites, and No. 9 drill site is arranged 5 borings, and No. 10 drill site is arranged 6 borings; No. 10 each drill site spacing of drill site to 26 drill site 50m, arrange 5 borings at each drill site;
Boring target bearing is 359 °, and each drill site open interior spacing is that 1m left and right, the spacing of wells are 10m, and the single hole degree of depth is 340m, and bore angle and opening inclination angle will change and adjust according to seam inclination, 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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