CN110056355A - Rush that Frozen-thawed cycled is anti-reflection takes out safe and efficient coal uncovering method - Google Patents
Rush that Frozen-thawed cycled is anti-reflection takes out safe and efficient coal uncovering method Download PDFInfo
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- CN110056355A CN110056355A CN201910332864.6A CN201910332864A CN110056355A CN 110056355 A CN110056355 A CN 110056355A CN 201910332864 A CN201910332864 A CN 201910332864A CN 110056355 A CN110056355 A CN 110056355A
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- 239000003245 coal Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 153
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000002347 injection Methods 0.000 claims abstract description 82
- 239000007924 injection Substances 0.000 claims abstract description 82
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 74
- 230000008014 freezing Effects 0.000 claims abstract description 65
- 238000007710 freezing Methods 0.000 claims abstract description 65
- 239000007789 gas Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 239000004575 stone Substances 0.000 claims abstract description 30
- 238000004080 punching Methods 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000010276 construction Methods 0.000 claims abstract description 13
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 238000002309 gasification Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 239000002775 capsule Substances 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005086 pumping Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Remote Sensing (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Rush that Frozen-thawed cycled is anti-reflection takes out safe and efficient coal uncovering method, comprising the following steps: (1) measures coal seam high pressure water injection radius of influence φ；(2) in drill site construction drill to roof or bottom plate；(3) drilling is divided into water injection hole and freezing hole, and water injection hole and freezing hole are alternately arranged；(4) sealing of hole is carried out to water injection hole and freezing hole；(5) water injection hole is filled the water, freezes the coal body around water injection hole freezing hole injection liquid nitrogen, after a period of time, then the coal body thaw freezed around water injection hole, liquid nitrogen gasification are made to freezing hole injection hot nitrogen；(6) extraction is carried out to the gas being discharged in water injection hole；(7) it after gas drainage 48 hours, repeats step (5)；(8) stone door punching coal operation is carried out.The present invention freezes-heat injection technique by coal body, effectively increases gas permeability of coal seam, is greatly improved coal bed gas extraction effect, reduces coal-bed gas pressure, eliminates Coal Seam Outburst Hazard.
Description
Technical field
The invention belongs to Safety of Coal Mine Production technical fields, and in particular to a kind of safe and efficient stone of anti-reflection rush pumping of Frozen-thawed cycled
Door method for uncovering coal.
Background technique
Coal and gas prominent is that one of the major casualty for threatening Safety of Coal Mine Production, especially crossdrift protrude when exposing coal seam
It is maximum intensity, most dangerous.Suddenly change easily occurs for coal petrography stress state in front of stone door punching coal working face, rock, coal seam elasticity
Potential and gas energy largely discharge and high-intensitive protrusion occur.80% or more super-huge protrusion all occurs in stone door punching coal
In the process, mean intensity outstanding is 6 times or more of other kinds tunnel intensity of outburst.Due to stone door punching coal construction technology
Particularity exposes projecting coal bed overall process than relatively hazardous, and continuous protrusion, postponing bursting may occur and voluntarily open protrusion,
Difficulty of prevention and cure more prominent than general type is bigger.
Currently, the projecting coal bed coal uncovering method of high methane is mainly real in terms of coal seam pressure relief and permeability improvement and coal body reinforce two
It applies.Mainly implement the measures such as hydraulic flushing in hole, standing and hydraulic slotted liner technique in terms of coal seam pressure relief and permeability improvement, reaches coal seam and sufficiently unload
Pressure, the effect for reducing crustal stress and gas pressure；But coal seam integrality at the same time, is destroyed, resistance outstanding is reduced, it is right
Outburst prevention work also has a negative side.The measures such as metallic framework, coal body grouting and reinforcing are mainly taken in terms of coal body reinforcing, are realized
The purpose for increasing coal mass strength, increasing prominent resistance, to reduce the risk and intensity of outburst of Gas Outburst；But coal body is reinforced
In the process, cement mortar can only in crack diffusion, since cracks in coal seam scale is very small, cement slurry range of scatter has
Limit, can only small-scale raising exposed coal regional coal-seam intensity, cannot achieve regional reinforcing, gas pressure can not also be effectively reduced
Power, for stone door punching coal regional coal-seam there are still higher crustal stress and gas pressure, coal body outburst hazard is still higher.Therefore,
There is an urgent need to provide a kind of safe and efficient coal uncovering method, it was both able to satisfy anti-reflection release, efficient draining coal seam gas, effectively drop
Present low gas pressure, and can strengthen and reinforce exposed coal area coal mass strength, realize stone door punching coal working face safely and fast exposed coal.
Summary of the invention
The present invention provides a kind of anti-reflection rush pumping of Frozen-thawed cycled safe and efficient stone to solve shortcoming in the prior art
Door method for uncovering coal, this method have scientific in principle, construction it is convenient, effectively improve coal bed gas extraction effect, improve exposed coal region
Coal mass strength reaches the feature that exposed coal is high-efficient, highly-safe.
In order to solve the above technical problems, the present invention adopts the following technical scheme: the anti-reflection rush of Frozen-thawed cycled takes out safe and efficient stone
Door method for uncovering coal, includes the following steps,
(1) near the stone door punching coal place of tunnel, coal seam high pressure water injection radius of influence φ is measured；
(2) in stone door punching coal working face away from drill site is arranged at the 5 ~ 7m of minimum normal distance of coal seam, construction drill is to coal in drill site
Layer top plate or bottom plate；
(3) during drilling construction, water injection hole of constructing first, then construction is freezed in the range of the two sides of water injection hole are less than φ
Hole is alternately arranged water injection hole and freezing hole, and stone door punching coal working face region is completely covered in the water injection hole and freezing hole constructed,
And the arrangement parameter of water injection hole and freezing hole meets relevant design requirement；
(4) sealing of hole is carried out to all water injection holes using conventional hole packer, all freezing holes is carried out using dedicated hole packer
Sealing of hole；
(5) water injection hole is filled the water by routine hole packer, injecting liquid nitrogen to freezing hole by dedicated hole packer makes water injection hole
Around coal body freeze, after a period of time, then by dedicated hole packer to freezing hole injection hot nitrogen make to freeze around water injection hole
The coal body thaw of knot, liquid nitrogen gasification；
(6) conventional hole packer is connected into gas drainage system, extraction is carried out to the gas being discharged in water injection hole, further decreases coal
Layer gas pressure；
(7) it after gas drainage 48 hours, repeats step (5), until stone door punching coal working face region coal body eliminates outburst hazard；
(8) extraction system is dismantled, is filled the water by conventional hole packer into water injection hole, liquid is then injected into coal seam by freezing hole
Nitrogen is taken and the methods of is blown out at a distance after stone door punching coal working face surrounding medium fully charge, and stone door punching coal work is carried out,
Safety opens crossdrift.
Dedicated hole packer includes central tube, grouting pump and note nitrogen pump, and the excircle of central tube is coaxial to be fixedly installed circle
The adiabator layer of tubular, adiabator layer excircle is coaxial to be fixedly installed sealing of hole capsule, and the outer end fixation of central tube is set
There is closure plate, by note nitrogen pipe connection between closure plate and the outlet of note nitrogen pump, the outlet of note nitrogen pipe is extend into central tube, grouting pump
Outlet connect with the outer end of sealing of hole capsule by Grouting Pipe, be provided with grouting valve in Grouting Pipe, infuse and be provided with note on nitrogen pipe
Nitrogen valve.
Sealing of hole capsule be it is columnar structured, the external peripheral surface of sealing of hole capsule is provided with spiral along the axial direction of central tube
Sealing strip.
The inner end of conventional hole packer is provided with temperature sensor.
The specific work steps of step (5) is,
A, pass through conventional hole packer using high-pressure pump and inject high pressure water into water injection hole, infused in the injecting process using pulse mode
Water, pulse mode water filling are low pressure → high pressure → low pressure → cycle of higher pressure mode pulse mode, promote coal body to produce crack, increase
Add gas permeability of coal seam；Reduced suddenly to coal wall appearance infiltration phenomenon around water injection hole or adjacent borehole water outlet or water injection pressure,
Or sustained water injection pressure without significant change when stop water filling；After stopping water filling half an hour, pass through the temperature extending into water injection hole
Sensor measurement water filling temperature in borehole；
B, sealing of hole is carried out to freezing hole using dedicated hole packer, by the way of high pressure pressure injection, by dedicated hole packer to freezing
Liquid nitrogen is injected in hole, freezing fracturing is carried out to freezing hole surrounding medium, so that freezing hole surrounding medium is become loose, ventilative, is increased
Coal body gas permeability is conducive to later period gas drainage and works；
C, water injection hole is determined when filling the water temperature in borehole lower than 0 DEG C by the temperature in temperature sensor real-time monitoring water injection hole
And freezing hole surrounding medium has freezed；
D, after water injection hole surrounding medium freezes, stop producing and be kept for status 8 hours or more, make freezing hole surrounding medium and water
Body sufficiently freezes；Heat injection nitrogen is carried out to freezing hole by dedicated hole packer after 8 hours, melts frozen region water body, liquid nitrogen
Gasification；The water vapour that the nitrogen and high temperature of gasification generate drives coal-bed gas to be discharged from the crack around water injection hole and freezing hole,
Coal-bed gas pressure is reduced, outburst hazard is reduced.
The sealing of hole process of dedicated hole packer is that central tube, adiabator layer and sealing of hole capsule are integrally inserted into freezing hole
It is interior, Grouting Pipe is connected into sealing of hole capsule, starts grouting pump, grouting pump injects grout into sealing of hole capsule, and sealing of hole capsule is swollen
Swollen, sealing of hole capsule outer walls and the press of helixseal item close grouting valve, so that freezing hole be blocked in freezing hole wall.
The note nitrogen process of dedicated hole packer is that note nitrogen pipe is connected closure plate, will infuse the import connection liquid nitrogen source or heat of nitrogen pump
Source nitrogen, starting note nitrogen pump, liquid nitrogen or hot nitrogen enter central tube by note nitrogen pipe, along central tube axial direction inwardly into
Enter into freezing hole, during injecting liquid nitrogen source or hot nitrogen gas source, adiabator layer plays the role of reducing heat transfer, mentions
High heat exchanger effectiveness.
The outer circle of central tube inner and outer ends is coaxial to be fixedly installed interior position-arresting disk and outer position-arresting disk, adiabator layer it is interior
Outer both ends are contacted with interior position-arresting disk and outer position-arresting disk respectively, and the diameter of interior position-arresting disk and outer position-arresting disk is greater than the straight of adiabator layer
Diameter and the diameter being less than after the expansion of sealing of hole capsule.
Interior thin outer thick leading in cone is provided on the inside of interior position-arresting disk excircle between the inner termination outer circle of central tube
To cylinder
By adopting the above technical scheme, the present invention has following technical effect that
(1)-heat injection technique (i.e. the anti-reflection rush of Frozen-thawed cycled takes out technique) is freezed by coal body, effectively increases gas permeability of coal seam, it can be big
It is big to improve coal bed gas extraction effect, coal-bed gas pressure is reduced, Coal Seam Outburst Hazard is eliminated.
(2) by being filled the water to coal seam internal high pressure, increase stone door punching coal working face region coal body moisture, promote coal body freeze thawing
It recycles anti-reflection rush and takes out effect, effectively increase coal body gas permeability, improve gas pumping effect.
(3) it after stone door punching coal working face region coal body eliminates outburst hazard, then carries out pumping water into coal, freeze, make coal body
Hard coal-ice cube body is become by loose loose media, coal mass strength is substantially increased, increases the resistance of Gas Outburst,
Ensure safe coal-openning.
(4) borehole engineering amount can be effectively reduced using the present invention, accelerates stone door punching coal working face exposed coal process, realized efficient
Exposed coal.
(5) interior position-arresting disk and outer position-arresting disk play the role of limiting adiabator layer, sealing of hole capsule axial position, make center
Pipe, restriction adiabator layer and sealing of hole capsule axis keep axial stability in sealing of hole.
(6) interior position-arresting disk also provides positioning support effect for the outer end of guide cylinder；Dedicated hole packer is protruded into drilling
When, guide cylinder plays the role of guiding, and local collapse hole is avoided to stop the insertion of dedicated hole packer.
Detailed description of the invention
Fig. 1 is present invention firing pattern in construction operation；
Fig. 2 is the structural schematic diagram of dedicated hole packer in the present invention.
Specific embodiment
As depicted in figs. 1 and 2, the anti-reflection rush of Frozen-thawed cycled of the invention takes out safe and efficient coal uncovering method, including following
Step,
(1) near 1 stone door punching coal place of tunnel, 2 high pressure water injection radius of influence φ of coal seam is measured；
(2) in stone door punching coal working face away from the place 5 ~ 7m of the minimum normal distance setting of coal seam 2 drill site 3, construction drill is extremely in drill site 3
2 top plate of coal seam or bottom plate；
(3) during drilling construction, water injection hole 4 of constructing first, then construction is frozen in the range of the two sides of water injection hole 4 are less than φ
Hole 5 is tied, water injection hole 4 and freezing hole 5 are alternately arranged, stone door punching coal work is completely covered in the water injection hole 4 and freezing hole 5 constructed
Face region, and the arrangement parameter of water injection hole 4 and freezing hole 5 meets relevant design and requires (this is existing conventional techniques)；
(4) all water injection holes 4 are sealed using conventional hole packer (this is existing conventional techniques, and specific structure repeats no more)
Hole carries out sealing of hole to all freezing holes 5 using dedicated hole packer；
(5) water injection hole 4 is filled the water by conventional hole packer, injecting liquid nitrogen to freezing hole 5 by dedicated hole packer makes to fill the water
Coal body around hole 4 freezes, after a period of time, then by dedicated hole packer to freezing hole 5 inject hot nitrogen make water injection hole 4 weeks
Enclose the coal body thaw freezed, liquid nitrogen gasification；
(6) conventional hole packer is connected into gas drainage system, extraction is carried out to the gas being discharged in water injection hole 4, is further decreased
2 gas pressure of coal seam；
(7) it after gas drainage 48 hours, repeats step (5), until 6 region coal body of stone door punching coal working face eliminates outburst danger
Property；
(8) extraction system is dismantled, is filled the water by conventional hole packer into water injection hole 4, is then infused by freezing hole 5 into coal seam 2
Enter liquid nitrogen, after 6 surrounding medium fully charge of stone door punching coal working face, takes and the methods of blow out at a distance, carry out stone door punching coal
Work, opens safely crossdrift.
Dedicated hole packer includes central tube 7, grouting pump 8 and note nitrogen pump 9, the coaxial fixed setting of the excircle of central tube 7
There is cylindric adiabator layer 10,10 excircle of adiabator layer is coaxial to be fixedly installed sealing of hole capsule 11, central tube 7
Outer end is fixed with closure plate 12, is connected between closure plate 12 and the outlet of note nitrogen pump 9 by note nitrogen pipe 13, the outlet of note nitrogen pipe 13 is stretched
Enter into central tube 7, the outlet of grouting pump 8 is connect with the outer end of sealing of hole capsule 11 by Grouting Pipe 14, is set in Grouting Pipe 14
It is equipped with grouting valve 15, infuses and is provided with nitrogen injecting valua 16 on nitrogen pipe 13.
Sealing of hole capsule 11 be it is columnar structured, the external peripheral surface of sealing of hole capsule 11 is arranged along the axial direction of central tube 7
There is helixseal item 17.
The inner end of conventional hole packer is provided with temperature sensor.
The specific work steps of step (5) are as follows:
A, pass through conventional hole packer using high-pressure pump and inject high pressure water into water injection hole 4, infused in the injecting process using pulse mode
Water, pulse mode water filling are low pressure → high pressure → low pressure → cycle of higher pressure mode pulse mode, promote coal body to produce crack, increase
2 gas permeability of coal layer；There is infiltration phenomenon or adjacent borehole water outlet to 4 surrounding coal wall of water injection hole or water injection pressure drops suddenly
Stop water filling when low or sustained water injection pressure is without significant change；After stopping water filling half an hour, by extending into water injection hole 4
Temperature in temperature sensor measurement water injection hole 4；
B, sealing of hole is carried out to freezing hole 5 using dedicated hole packer, by the way of high pressure pressure injection, by dedicated hole packer to freezing
Liquid nitrogen is injected in hole 5, freezing fracturing is carried out to 5 surrounding medium of freezing hole, so that freezing hole surrounding medium is become loose, ventilative, increases
Coal body gas permeability is conducive to later period gas drainage and works；
C, by the temperature in temperature sensor real-time monitoring water injection hole 4, when temperature is lower than 0 DEG C in water injection hole 4, water filling is determined
Hole 4 and 5 surrounding medium of freezing hole have freezed；
D, after 4 surrounding medium of water injection hole freezes, stop produce simultaneously kept for status 8 hours or more, make 5 surrounding medium of freezing hole and
Water body sufficiently freezes；Heat injection nitrogen is carried out to freezing hole 5 by dedicated hole packer after 8 hours, melts frozen region water body, liquid
Nitrogen；The water vapour that the nitrogen and high temperature of gasification generate drives 2 gas of coal seam from the crack around water injection hole 4 and freezing hole 5
Discharge reduces by 2 gas pressure of coal seam, reduces outburst hazard.
The sealing of hole process of dedicated hole packer is that central tube 7, adiabator layer 10 and sealing of hole capsule 11 are integrally inserted into jelly
It ties in hole 5, Grouting Pipe 14 is connected into sealing of hole capsule 11, starts grouting pump 8, grouting pump 8 injects grout into sealing of hole capsule 11
Portion, sealing of hole capsule 11 expand, and 11 outer wall of sealing of hole capsule and the press of helixseal item 17 close grouting valve 15 in 5 wall of freezing hole, from
And freezing hole 5 is blocked.
The note nitrogen process of dedicated hole packer is that note nitrogen pipe 13 is connected closure plate 12, and the import for infusing nitrogen pump 9 is connected liquid nitrogen source
Or hot nitrogen gas source, starting note nitrogen pump 9, liquid nitrogen or hot nitrogen pass through note nitrogen pipe 13 and enter central tube 7, along the axial direction of central tube 7
Direction is inwardly into freezing hole 5, and during injecting liquid nitrogen source or hot nitrogen gas source, adiabator layer 10 plays reduction heat
The effect of conduction improves heat exchanger effectiveness.
The outer circle of 7 inner and outer ends of central tube is coaxial to be fixedly installed interior position-arresting disk 18 and outer position-arresting disk 19, thermal insulation material
The inner and outer ends of layer 10 are contacted with interior position-arresting disk 18 and outer position-arresting disk 19 respectively, and the diameter of interior position-arresting disk 18 and outer position-arresting disk 19 is big
In adiabator layer 10 diameter and be less than sealing of hole capsule 11 expand after diameter.
It is provided between the inner termination outer circle of central tube 7 on the inside of interior 18 excircle of position-arresting disk interior thin outer thick in cone
Guide cylinder 20.
The hot nitrogen that the present invention injects can be replaced using heat steam.
The present embodiment not makes any form of restriction shape of the invention, material, structure etc., all according to this hair
Bright technical spirit any simple modification, equivalent change and modification to the above embodiments, belong to the technology of the present invention side
The protection scope of case.
Claims (9)
1. rush that Frozen-thawed cycled is anti-reflection takes out safe and efficient coal uncovering method, it is characterised in that: include the following steps,
(1) near the stone door punching coal place of tunnel, coal seam high pressure water injection radius of influence φ is measured；
(2) in stone door punching coal working face away from drill site is arranged at the 5 ~ 7m of minimum normal distance of coal seam, construction drill is to coal in drill site
Layer top plate or bottom plate；
(3) during drilling construction, water injection hole of constructing first, then construction is freezed in the range of the two sides of water injection hole are less than φ
Hole is alternately arranged water injection hole and freezing hole, and stone door punching coal working face region is completely covered in the water injection hole and freezing hole constructed,
And the arrangement parameter of water injection hole and freezing hole meets relevant design requirement；
(4) sealing of hole is carried out to all water injection holes using conventional hole packer, all freezing holes is carried out using dedicated hole packer
Sealing of hole；
(5) water injection hole is filled the water by routine hole packer, injecting liquid nitrogen to freezing hole by dedicated hole packer makes water injection hole
Around coal body freeze, after a period of time, then by dedicated hole packer to freezing hole injection hot nitrogen make to freeze around freezing hole
The coal body thaw of knot, liquid nitrogen gasification；
(6) conventional hole packer is connected into gas drainage system, extraction is carried out to the gas being discharged in water injection hole, further decreases coal
Layer gas pressure；
(7) it after gas drainage 48 hours, repeats step (5), until stone door punching coal working face region coal body eliminates outburst hazard；
(8) extraction system is dismantled, is filled the water by conventional hole packer into water injection hole, liquid is then injected into coal seam by freezing hole
Nitrogen is taken and the methods of is blown out at a distance after stone door punching coal working face surrounding medium fully charge, and stone door punching coal work is carried out,
Safety opens crossdrift.
2. the anti-reflection rush of Frozen-thawed cycled according to claim 1 takes out safe and efficient coal uncovering method, it is characterised in that: dedicated
Hole packer includes central tube, grouting pump and note nitrogen pump, and the excircle of central tube is coaxial to be fixedly installed cylindric thermal insulating material
The bed of material, adiabator layer excircle is coaxial to be fixedly installed sealing of hole capsule, and the outer end of central tube is fixed with closure plate, closure plate with
It infuses by note nitrogen pipe connection between the outlet of nitrogen pump, the outlet of note nitrogen pipe is extend into central tube, the outlet of grouting pump and sealing of hole
The outer end of capsule is connected by Grouting Pipe, and grouting valve is provided in Grouting Pipe, is infused and is provided with nitrogen injecting valua on nitrogen pipe.
3. the anti-reflection rush of Frozen-thawed cycled according to claim 2 takes out safe and efficient coal uncovering method, it is characterised in that: sealing of hole
Capsule be it is columnar structured, the external peripheral surface of sealing of hole capsule is provided with helixseal item along the axial direction of central tube.
4. the anti-reflection rush of Frozen-thawed cycled according to claim 1 takes out safe and efficient coal uncovering method, it is characterised in that: conventional
The inner end of hole packer is provided with temperature sensor.
5. the anti-reflection rush of Frozen-thawed cycled according to claim 4 takes out safe and efficient coal uncovering method, it is characterised in that: step
(5) specific work steps is,
A, pass through conventional hole packer using high-pressure pump and inject high pressure water into water injection hole, infused in the injecting process using pulse mode
Water, pulse mode water filling are low pressure → high pressure → low pressure → cycle of higher pressure mode pulse mode, promote coal body to produce crack, increase
Add gas permeability of coal seam；Reduced suddenly to coal wall appearance infiltration phenomenon around water injection hole or adjacent borehole water outlet or water injection pressure,
Or sustained water injection pressure without significant change when stop water filling；After stopping water filling half an hour, pass through the temperature extending into water injection hole
Sensor measurement water filling temperature in borehole；
B, sealing of hole is carried out to freezing hole using dedicated hole packer, by the way of high pressure pressure injection, by dedicated hole packer to freezing
Liquid nitrogen is injected in hole, freezing fracturing is carried out to freezing hole surrounding medium, so that freezing hole surrounding medium is become loose, ventilative, is increased
Coal body gas permeability is conducive to later period gas drainage and works；
C, water injection hole is determined when filling the water temperature in borehole lower than 0 DEG C by the temperature in temperature sensor real-time monitoring water injection hole
And freezing hole surrounding medium has freezed；
D, after water injection hole surrounding medium freezes, stop producing and be kept for status 8 hours or more, make freezing hole surrounding medium and water
Body sufficiently freezes；Heat injection nitrogen is carried out to freezing hole by dedicated hole packer after 8 hours, melts frozen region water body, liquid nitrogen
Gasification；The water vapour that the nitrogen and high temperature of gasification generate drives coal-bed gas to be discharged from the crack around water injection hole and freezing hole,
Coal-bed gas pressure is reduced, outburst hazard is reduced.
6. the anti-reflection rush of Frozen-thawed cycled according to claim 5 takes out safe and efficient coal uncovering method, it is characterised in that: dedicated
The sealing of hole process of hole packer is integrally to be inserted into freezing hole central tube, adiabator layer and sealing of hole capsule, Grouting Pipe is connected
Sealing of hole capsule is connect, grouting pump is started, grouting pump injects grout into sealing of hole capsule, and sealing of hole capsule expands, outside sealing of hole capsule
Wall and the press of helixseal item close grouting valve, so that freezing hole be blocked in freezing hole wall.
7. the anti-reflection rush of Frozen-thawed cycled according to claim 5 takes out safe and efficient coal uncovering method, it is characterised in that: dedicated
The note nitrogen process of hole packer is that note nitrogen pipe is connected closure plate, will infuse the import connection liquid nitrogen source or hot nitrogen gas source of nitrogen pump, starting note
Nitrogen pump, liquid nitrogen or hot nitrogen enter central tube by infusing nitrogen pipe, and the axial direction along central tube is inwardly into freezing hole,
During injecting liquid nitrogen source or hot nitrogen gas source, adiabator layer plays the role of reducing heat transfer, improves heat exchanger effectiveness.
8. the anti-reflection rush of Frozen-thawed cycled according to claim 2 takes out safe and efficient coal uncovering method, it is characterised in that: center
The outer circle of pipe inner and outer ends is coaxial to be fixedly installed interior position-arresting disk and outer position-arresting disk, the inner and outer ends of adiabator layer respectively with
The diameter of interior position-arresting disk and the contact of outer position-arresting disk, interior position-arresting disk and outer position-arresting disk is greater than the diameter of adiabator layer and is less than sealing of hole
Diameter after capsule expansion.
9. the anti-reflection rush of Frozen-thawed cycled according to claim 8 takes out safe and efficient coal uncovering method, it is characterised in that: interior limit
The interior thin outer thick guide cylinder in cone is provided on the inside of the disk excircle of position between the inner termination outer circle of central tube.
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