CN102242640B - Rapid outburst elimination method for cross cut coal uncovering in coal mine underground - Google Patents

Rapid outburst elimination method for cross cut coal uncovering in coal mine underground Download PDF

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Publication number
CN102242640B
CN102242640B CN 201110185982 CN201110185982A CN102242640B CN 102242640 B CN102242640 B CN 102242640B CN 201110185982 CN201110185982 CN 201110185982 CN 201110185982 A CN201110185982 A CN 201110185982A CN 102242640 B CN102242640 B CN 102242640B
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China
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coal
pressure
fracturing
water
pressure break
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CN 201110185982
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Chinese (zh)
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CN102242640A (en
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王建国
苏现波
刘晓
马耕
李伍成
陶云奇
丁建础
辛新平
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河南煤业化工集团研究院有限责任公司
河南理工大学
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Abstract

The invention provides a rapid outburst elimination method for cross cut coal uncovering in coal mine underground. The method comprises the following steps: before an outburst coal layer is uncovered by a cross cut, arranging hydraulic fracturing drill holes at the part, the normal distance of which is 5-7m with a coal layer, on a cross cut coal uncovering work face; sealing the fracturing drill holes; fracturing the fracturing drill holes with clear water the injection amount of which is determined according to an outburst elimination range; after fracture is finished, constructing deslagging blowholes, injecting high-pressure water into the fracturing drill holes for punching, and discharging coal and rocks generated from fracturing to the outside through the deslagging blowholes; carrying out gas extraction and drilling on the cross cut coal uncovering work face, sealing the drill holes by use of polyurethane and carrying out gas extraction, wherein the holes are sealed to the top plate/bottom plate of the coal layer; injecting high-pressure nitrogen or air into the fracturing holes, observing the gas flow and concentration change in gas extraction holes, and stopping gas injection if flow increases; if the gas extraction effect reaches the standard, and uncovering the rock cross cut when no outburst danger occurs to the cross cut work face; and if the gas extraction effectis not good, implementing fracturing once again and injecting high-pressure gas to expel and exchange methane. The method has the advantages of accelerating the coal uncovering speed of the cross cutwork face, playing a role in dust suppression, and improving the work conditions of a tunneling work face.

Description

The quick extinction method of stone door punching coal under the coal mine

Technical field

The present invention relates to the quick extinction method of stone door punching coal under a kind of coal mine.

Background technology

National security production supervision administrative department, Coal Mine Safety Supervision Bureau of country " the outstanding regulation of control coal and gas " the 81 regulation in August, 2009 " outburst prevention measures of stone door punching coal work plane comprises pre-gas pumping; bleeder off hole; hydraulic flushing in hole; metallic framework; coal body curing or through other through the evidence effective measures ", " according to work plane rock stratum situation; require exposed coal work plane and projecting coal bed minimum normal direction distance to be during implementation face outburst prevention measures: gas pumping in advance; bleeder off hole and hydraulic flushing in hole are 5m, metallic framework; coal body curing measure is 2m.Big when the roadway section, when the catalase degree is higher, also should suitably strengthen distance ".

Although " the outstanding regulation of control coal and gas " enumerated more method and technology to the outburst prevention measures of stone door punching coal, but in implementation process, because the difference of condition of coal seam occurrence, one or more measures wherein are difficult to play the effect of quick extinction in implementation process, influenced the speed of stone door punching coal, and then the digging that has influenced mine is taken over and is kept the safety in production.

Summary of the invention

The quick extinction method that is to provide stone door punching coal under a kind of coal mine of the present invention not only can improve the exposed coal speed of crossdrift work plane, can play the effect of dust suppression simultaneously, improves the condition of work of crossdrift work plane.

To achieve these goals, the utility model adopts following technical scheme: the quick extinction method of stone door punching coal under the coal mine, may further comprise the steps: (1) crossdrift open projecting coal bed before, be that 5 ~ 7 m places arrange fracturing boring at work plane apart from the coal seam vertical distance, the boring number is according to fracturing hole influence basin, drift section size and require the extinction scope to determine; Holing, whole hole penetrates seam roof/base plate and drilling depth is not less than 0.5m; (2) pressure break drilling and sealing uses compressive strength to be not less than 15 MPa Steel Tube Specials, the above high strength cement of 425 labels carries out sealing of hole, sealed borehole length from the aperture to seam roof/base plate; (3) with clear water pressure break is implemented in pressure break boring, injected water pressure and determine according to superincumbent stratum thickness, line loss, coal petrography compressive strength; Injected water volume is not less than 20m3/h; Injected water volume is determined according to the protrusion-dispelling scope, requires the protrusion-dispelling scope more big, needs water injection rate more many; (4) after pressure break is finished, carry out punching with water under high pressure, coal, sillar that pressure break produces are gone out outside the hole with water under high pressure; (5) " the outstanding regulation of coal and gas preventing and control " construction extraction borehole of making in August, 2009 by national security production supervision administrative department, national Coal Mine Safety Supervision Bureau at the stone door punching coal work plane, with the polyurethane sealing of hole and carry out extraction, sealed borehole length is to seam roof/base plate; (6) for improving extraction efficient, inject high pressure nitrogen or air in the pressure break hole, nitrogen or atmospheric pressure are not less than 0.4MPa, observe the variation of extraction hole gas flow and concentration, increase as flow and then can stop gas injection; (7) up to standard when the extraction effect, when the crossdrift work plane does not have outburst hazard, can begin driving; Bad as the extraction effect, can implement pressure break again and inject gases at high pressure and become to changing methane.

In the described step (2), the compressive strength of Steel Tube Special is more than the 15MPa, and it is more than the 30MPa that high strength cement solidifies back compressive strength.

In the described step (3), water injection rate is 2% ~ 4% of the interior coal body volume of pressure break scope, can think that after the water of this amount of injection water filling finishes; Simultaneously, in fracturing process, to observe the situation of change of injection pump pressure closely, reach 30% in case find the decline of water injecting pump pressure break, then will improve injection rate by the gear that changes water injecting pump, so repeatedly, be as the criterion until finishing the water filling design.

In the described step (1), crossdrift open projecting coal bed before, be that 5 m places arrange fracturing boring at work plane apart from the coal seam vertical distance.

The present invention is by implementing to press, dash, drive processing steps such as (pressure break, punching, purgings) to crossdrift, change present situations such as present stone door punching coal speed is slow, the borehole engineering amount is big, operation inconvenience, can solve problems such as crossdrift work plane outburst hazard is big, coal-bed gas extraction difficulty.Not only can accelerate the exposed coal speed of crossdrift work plane, can play the effect of dust suppression simultaneously, improve the condition of work of crossdrift work plane.

Description of drawings

Fig. 1 is the schematic diagram in pressure break stage;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the schematic diagram in punching stage;

Fig. 4 is the schematic diagram in extraction stage;

Fig. 5 is the schematic diagram in purging stage.

The specific embodiment

Embodiment: shown in Fig. 1-5, the quick extinction method of stone door punching coal may further comprise the steps under a kind of coal mine:

(1) crossdrift open projecting coal bed before, work plane apart from the coal seam 5 ~ 7 m places (hang down apart from) arrange fracturing boring (adopting 5m in the present embodiment), the boring number is according to fracturing hole influence basin, drift section size and require the extinction scope to determine; The whole hole of holing penetrates the top in coal seam (end) plate and is not less than 0.5m.

" the outstanding regulation of control coal and gas " the 82 stipulates that " when crossdrift and uncovering coal in vertical shaft work plane adopted pre-gas pumping, degassing hole outburst prevention measures, bore diameter was generally 75 ~ 120 mm.The control range of stone door punching coal work plane boring is: the both sides of crossdrift and upper wheels profile be at least 5 m outward, bottom at least 3 m.Uncovering coal in vertical shaft work plane boring control range is: nearly level, gentle dip, inclined seam are outline line 5m at least outward around the pit shaft; Half-edge coal seam across pitch both sides and outside the inclined upper outline line at least 5 m, the lower wheel profile is at least 3 m outward.”。

Therefore, when implementing pressure break, the required control range of pressure break is got maximum value: the both sides of crossdrift and top and the bottom outline line are got 5 m at least.According to the experience of construction fracturing boring was as can be known in the coal seam in the past, the fracturing effective radius is not less than 10 m, therefore, even consider the size of crossdrift area, the pressure break of only constructing at the crossdrift middle part is holed, and the influence basin of pressure break also can reach predetermined requirement; Certainly in order to make the extinction scope reach requirement early, can arrange that also 2 ~ 3 pressure break holes inject water under high pressure simultaneously.

(2) pressure break drilling and sealing uses Steel Tube Special (compressive strength is as more than the 15MPa), special cement (solidifying more than the compressive strength 30MPa of back) to carry out sealing of hole, sealed borehole length from the aperture to top (end) plate in coal seam;

The tight degree of sealed borehole length and sealing of hole is directly connected to the success or failure of water filling, and sealed borehole length should guarantee the sealed borehole length maximization under the prerequisite that does not seal the coal seam.

(3) with clear water pressure break is implemented in pressure break boring, injected water pressure and can determine according to superincumbent stratum thickness, line loss, coal petrography compressive strength; Injected water volume is not less than 20m3/h; Injected water volume is determined according to the protrusion-dispelling scope, requires the protrusion-dispelling scope more big, needs water injection rate more many.

Determining and can determining according to coal body cranny development degree and porosity in the scope of need extinction coal seam of water injection rate is generally 2% ~ 4% of the interior coal body volume of pressure break scope, can think that after the water of this amount of injection water filling finishes.Simultaneously, in fracturing process, to observe the situation of change of injection pump pressure closely, descend 30% in case find the water injecting pump pressure break, then will improve injection rate by the gear that changes water injecting pump.So repeatedly, be as the criterion until finishing the water filling design.

(4) after fracturing is finished, can execute limit construction mud hole at pressure break hole periphery, by using equipment such as high-pressure pump that punching is carried out in the pressure break hole, the coal that has broken after pressure break is finished, rock mass are gone out outside the hole by mud hole and pressure break hole, play the anti-reflection effect of the place ahead coal mass relief.

(5) at the stone door punching coal work plane by " coal and the gas preventing and control outstanding regulation " extraction borehole of constructing, with the polyurethane sealing of hole and carry out extraction, sealed borehole length is to the end (top) plate in coal seam;

(6) for improving extraction efficient, inject high pressure nitrogen or air in the pressure break hole, nitrogen or atmospheric pressure are not less than 0.4MPa, observe the variation of extraction hole gas flow and concentration, increase as flow and then can stop gas injection;

High-pressure nitrogen bottle can be transported to the down-hole, and by pipeline gas injection in the pressure break hole, operating personnel to be with Frostbite preventing gloves and mask during gas injection, in order to avoid health is damaged.

(7) up to standard when the extraction effect, when driving face does not have outburst hazard, can begin driving, bad as the extraction effect, can implement pressure break again and inject gases at high pressure and become to changing methane.

The present invention proposes the stone door punching coal outburst prevention measures of " fracturing, punching, the nitrogen that becomes are replaced ", present situations such as present stone door punching coal speed is slow in the hope of changing, the borehole engineering amount is big, operation inconvenience.

Fig. 1 is the schematic diagram in pressure break stage, in the 3 construction pressure break borings 1,2 of stone door punching coal work plane, injects water under high pressure pressure break is carried out in the coal seam, plays the effect of opening crack, coal seam, the coal body that breaks.Hole, pressure break hole length penetrates the coal seam, and the aperture is between 75 ~ 120mm.Be the pressure break smooth implementation that guarantees, need sealing of hole is carried out in the pressure break hole that compressive strength is not less than 20MPa behind the sealing of hole.Fig. 2 is the A-A sectional view of Fig. 1, and 4 is crossdrift, and 5 is coal body.

Fig. 3 is the schematic diagram in punching stage, after pressure break is finished, in pressure break hole 1,2 peripheral different distance construction mud holes 6, after construction is finished by the operation of washing by water of high-pressure hydraulic pump 8 and 7 pairs of pressure break holes of outlet pipe, the coal petrography piece that produces in the pressure break stage is gone out outside the hole by mud hole 6, played the purpose of loose coal body, release, increase coal body gas permeability.

Fig. 4 is the schematic diagram in extraction stage, after punching is finished, in crossdrift work plane 3 construction extractions 9 holes, and with polyurethane mud hole and extraction hole is carried out sealing of hole, links the extraction system and carries out extraction.

Fig. 5 is the schematic diagram in purging stage, bad as the extraction effect, can use high-pressure nitrogen bottle 11 to carry out purging by 10 pairs of borings of purging pipe, nitrogen cylinder is connected with boring with pipeline, beginning is to the interior nitrogen injection of boring, order about the Gas Flow in the coal body, extraction is carried out in the easy extraction that becomes again after purging is finished.

Claims (4)

1. the quick extinction method of stone door punching coal under the coal mine, it is characterized in that: may further comprise the steps: (1) crossdrift open projecting coal bed before, be that 5 ~ 7 m places arrange fracturing boring at work plane apart from the coal seam vertical distance, the boring number is according to fracturing hole influence basin, drift section size and require the extinction scope to determine; Holing, whole hole penetrates seam roof/base plate and drilling depth is not less than 0.5m; (2) pressure break drilling and sealing uses compressive strength to be not less than 15 MPa Steel Tube Specials, the above high strength cement of 425 labels carries out sealing of hole, sealed borehole length from the aperture to seam roof/base plate; (3) with clear water pressure break is implemented in pressure break boring, injected water pressure and determine according to superincumbent stratum thickness, line loss, coal petrography compressive strength; Injected water volume is not less than 20m3/h; Injected water volume is determined according to the protrusion-dispelling scope, requires the protrusion-dispelling scope more big, needs water injection rate more many; (4) after pressure break is finished, carry out punching with water under high pressure, coal, sillar that pressure break produces are gone out outside the hole with water under high pressure; (5) " the outstanding regulation of coal and gas preventing and control " construction extraction borehole of making in August, 2009 by national security production supervision administrative department, national Coal Mine Safety Supervision Bureau at the stone door punching coal work plane, with the polyurethane sealing of hole and carry out extraction, sealed borehole length is to seam roof/base plate; (6) for improving extraction efficient, inject high pressure nitrogen or air in the pressure break hole, nitrogen or atmospheric pressure are not less than 0.4MPa, observe the variation of extraction hole gas flow and concentration, increase as flow and then can stop gas injection; (7) up to standard when the extraction effect, when the crossdrift work plane does not have outburst hazard, can begin driving; Bad as the extraction effect, can implement pressure break again and inject gases at high pressure and become to changing methane.
2. the quick extinction method of stone door punching coal under the coal mine according to claim 1, it is characterized in that: in the described step (2), the compressive strength of Steel Tube Special is more than the 15MPa, it is more than the 30MPa that high strength cement solidifies back compressive strength.
3. the quick extinction method of stone door punching coal under the coal mine according to claim 1 and 2 is characterized in that: in the described step (3), water injection rate be in the pressure break scope coal body volume 2% ~ 4%, after the water of this amount of injection, can think the water filling end; Simultaneously, in fracturing process, to observe the situation of change of injection pump pressure closely, reach 30% in case find the decline of water injecting pump pressure break, then will improve injection rate by the gear that changes water injecting pump, so repeatedly, be as the criterion until finishing the water filling design.
4. the quick extinction method of stone door punching coal under the coal mine according to claim 3 is characterized in that: in the described step (1), crossdrift open projecting coal bed before, be that 5 m places arrange fracturing boring at work plane apart from the coal seam vertical distance.
CN 201110185982 2011-07-05 2011-07-05 Rapid outburst elimination method for cross cut coal uncovering in coal mine underground CN102242640B (en)

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