CN106337672B - A kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing - Google Patents
A kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing Download PDFInfo
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- CN106337672B CN106337672B CN201610938189.8A CN201610938189A CN106337672B CN 106337672 B CN106337672 B CN 106337672B CN 201610938189 A CN201610938189 A CN 201610938189A CN 106337672 B CN106337672 B CN 106337672B
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- 239000003245 coal Substances 0.000 title claims abstract description 121
- 238000010257 thawing Methods 0.000 title claims abstract description 52
- 238000000605 extraction Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 230000010349 pulsation Effects 0.000 claims abstract description 15
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 76
- 230000000694 effects Effects 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 7
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 238000002309 gasification Methods 0.000 description 8
- 230000006378 damage Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229960004424 carbon dioxide Drugs 0.000 description 5
- 238000005065 mining Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000003068 static effect Effects 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
- 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
-
- 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
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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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- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of methods of anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing.Construction forms a drilling and multiple rows of guiding slot first in coal seam, is oriented to drilling described in slot connection and extends along with drilling vertical direction to drilling two sides in coal seam, opens up coal bed gas extraction borehole in guiding slot outer end.It is anti-reflection to coal seam progress freeze thawing fracturing using pulsating cyclic low temperature freezing-thawing method to drilling and each guiding slot mesohigh pulsation injection liquid low temperature medium, form coal bed gas extraction Fracture Networks.Pass through coal bed gas extraction borehole extraction coal bed gas.The method of the present invention combines pulsating cyclic fluid injection state cryogenic media and freeze thawing phase transformation fracturing, significantly improves the anti-reflection efficiency of coal body freeze-thaw erosion phenomenon in conjunction with coal bed gas extraction.Method is simple, and construction cost is low, can effectively improve coal-bed gas single hole extraction amount and extraction concentration, extends gas density die-away time.It is particularly suitable for low-permeability, coal bed gas extraction in high methane preservation coal seam.
Description
Technical field
The present invention relates to a kind of method of extraction coal bed gas, especially a kind of anti-reflection coal body of cycle pulse formula low temperature freeze thawing is taken out
The method of mining coal seam gas.
Technical background
Coal bed gas is used as a kind of fungible energy source, Coalbed Methane In China total amount as a kind of unconventional energy resource, in many countries
Greatly, suitable with natural gas resource total amount, with the increase of mining depth, coal bed gas content, pressure in coal seam are also gradually increased, coal
Layer permeability is gradually reduced, and the Gas Disasters such as coal bed gas explosion, coal and gas prominent are also on the rise.Due to China's coal seam reservoirs
Low-permeability overcomes the problems, such as that coal bed gas extraction concentration is low, small pumping volume is always the most important thing for administering Gas Disaster, at present
Deep single coal bed extraction coal bed gas conventional method mostly uses hydraulic fracturing, hydraulic slotted liner technique, standing etc..Above-mentioned coal bed gas is taken out
Mining method is anti-reflection, and range is small, can not form a wide range of coal bed gas extraction crack passage, cause coal bed gas extraction rate low, coal bed gas is controlled
It is undesirable to manage effect.
Freeze-thaw erosion is the volume expansion since the moisture in soil and its matrix hole or in rock fracture is when freezing,
Increase crack therewith, increase caused by the monolith soil body or the chipping phenomenon of rock.Melt repeatedly caused by freeze-thaw erosion
With freeze, cause the destruction of the soil body or rock mass, disturbance, deformation even mobile, cause the serious destruction of object configurations.Freeze thawing phenomenon
It is a kind of common physico-geological function and phenomenon in nature, particularly occurs in the bigger object configurations of difference variation.
The appearance repeatedly of Frozen-thawed cycled causes the serious destruction of object configurations.The fracturing that freeze-thaw erosion phenomenon is applied to coal body is anti-reflection
In, the damage Fracturing of freeze-thaw erosion can be given full play to.
Under normal pressure, such as reachable -196 DEG C/- 37 DEG C of liquid nitrogen/carbon dioxide temperature of liquid low temperature medium, gasify pure for 21 DEG C
Expansion rate when nitrogen/carbon dioxide is respectively 696 times/585 times, can produce huge air pressure, liquid low temperature in a limited space
Medium gasification latent heat is respectively 5.56kJ/mol and 5.34kJ/mol, when gasification absorbable surrounding amount of heat.Liquid nitrogen/liquid two
Carbonoxide has many advantages, such as that preparation is simple, raw material sources are extensive, and liquid low temperature medium can be used as one kind in coal body Frozen-thawed cycled
Efficient refrigeration and anti-reflection medium.
Pulsation pressure break has higher efficiency compared to static pressure pressure break, how to cooperate with pulsation liquid low temperature medium pressure break and freeze thawing
Damage is to overcome the critical issue of coal bed gas extraction low efficiency.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, a kind of anti-reflection coal body extraction coal bed gas of low temperature freeze thawing is provided
Method.The method of the present invention is based on the anti-reflection coal body of water jet slot pulsating cyclic low temperature freeze thawing, increases coal seam fracturing range and effect
Rate promotes the formation of Fracture Networks, is remarkably improved coal bed gas extraction amount.
A kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing, includes the following steps：
Step 1, in coal seam, constructed in coal seam using water jet slotting process formation one drilling and multiple rows of guide slit
Slot, there is two guiding slots in every row, drilling described in the guiding slot connection and in coal seam along with drilling vertical direction to brill
Hole two sides extend.Coal bed gas extraction borehole is opened up in guiding slot outer end.
Step 2 injects liquid low temperature medium to drilling and each guiding slot mesohigh pulsation, using pulsating cyclic low-temperature frozen
It is anti-reflection to coal seam progress freeze thawing fracturing to melt method, forms coal bed gas extraction Fracture Networks.
Step 3 passes through coal bed gas extraction borehole extraction coal bed gas.
The pulsating cyclic low temperature freezing-thawing method is anti-reflection to coal seam progress freeze thawing fracturing, and step is：
A, to drilling and each guiding slot mesohigh pulsation injection liquid low temperature medium, until the single liquid low temperature of setting is situated between
Matter injection length stops the injection of liquid cryogenic media；With injection process, the moisture in coal seam is frozen into ice, generates frost heave
Fracturing effect.
B, freeze coal body absorption formation temperature gradually to melt, to form the circulating freezing resistance effect in coal seam.
C, after the coal seam freezed is dissolved, to drilling and each guiding slot mesohigh gas injection, water flow and cooling capacity is promoted to pass
It passs, conducting freeze thawing crack and expansion freeze thawing range.
D, according to the freezing-thawing cycles of setting, circulation executes step a~step c.
The liquid low temperature medium can be the inertia cryogenic media such as liquid nitrogen, liquid carbon dioxide.
Optimally, the single liquid low temperature medium injection length is 10min.
The freezing-thawing cycles cycle-index is 5-10 times.
The high-pressure gas injection, gas injection time 10min.
Beneficial effect：
The method of the present invention is innovatively destroyed freezing-thawing damage bad freeze-thaw erosion phenomenon in conjunction with coal bed gas extraction
Gesture is converted into advantage, and pulsating cyclic fluid injection state cryogenic media and freeze thawing phase transformation fracturing are combined, and collaboration efficiently utilizes two methods,
Significantly improve the anti-reflection efficiency of coal body.
Pulsating cyclic injects liquid low temperature medium, can produce three kinds of freeze thawing fracturing, high pressure gas fracturing, low temperature fracturing fracturings
Effect.The boosting gas injection process of high pressure gas can produce high pressure gas fracturing effect, and can increase the diffusion of cooling capacity and expand freeze thawing
Fracturing range.By the way that coal-bed gas single hole extraction amount and extraction concentration can be effectively improved after circulating freezing resistance, extends gas density and decline
Subtract the time.Since pulsation freeze thawing medium can penetrate into coal seam well, coal seam can be effectively eliminated after pulsation freeze thawing is anti-reflection
Local high stress concentration zone promotes the migration of local accumulation gas, discharges the coal and gas prominent potential gathered in coal seam, has
Coal and gas prominent effect is eliminated well.In addition, liquid low temperature medium not only has efficient gasification expansion efficiency, gasification is same
When also absorb coal seam amount of heat, to coal body fire extinguishing have positive effect.It is low that the method for the present invention efficiently solves high methane
Gas coal seam permeability improves critical issue unobvious, that fracturing range is small, has wide applicability.
Detailed description of the invention
Fig. 1 is the anti-reflection coal body extraction coal bed gas method schematic diagram of cycle pulse formula low temperature freeze thawing based on water jet slot.
Fig. 2 is the gasifier structural schematic diagram in Fig. 1.
Fig. 3 is Pneumatic booster pump schematic diagram in Fig. 1.
Fig. 4 is A-A section pipeline and drilling arrangement schematic diagram in Fig. 1.
Fig. 5 is that a layer uphole pulsed circulation fluid injection state cryogenic media orientation freeze thawing anti-reflection coal body extraction coal seam is worn in low level lane
Gas method schematic diagram.
Fig. 6 is that a layer downhole pulsed circulation fluid injection state cryogenic media orientation freeze thawing anti-reflection coal body extraction coal seam is worn in high-order lane
Gas method schematic diagram.
In figure：1- liquid low temperature medium tank car, 1-1- liquid low temperature medium tank car total valve, 1-2- liquid low temperature are situated between
Matter tank car sub-valve, 2-gasifiers, 2-1-gasifier entrance, 2-2-liquid low temperature medium vapor lamp, 2-3-star fin,
2-4-gasifier exit, 3-Pneumatic booster pumps, 3-1-driving gas source, 3-2-are by pressurization air source, 3-3-boost pressure ga(u)ge,
3-4-pressurization gas outlet, 4-high pressure current stabilization air storage chambers, 5-ripple regulators, 6-pulsation injecting liquid state pumps for cryogenic media, 6-
1- Injection valve, 7-high-pressure air pipes, 7-1-High-pressure air valve, 8- water jet slot equipment, 9- supervisor, 9-1- floral tube, 9-
2- drilling, 10- sealing section, 11- are oriented to slot, the coal seam 12-, 13- coal bed gas extraction borehole, 14- pulsating cyclic low temperature
Freeze thawing equipment group, 15-1- low level lane, 15-2- high position lane.
Specific embodiment
The specific embodiment of the invention is further described with reference to the accompanying drawing.
Embodiment one, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, in coal seam 12, using water jet slot equipment 8 in coal seam
Middle construction forms drilling 9-2 and multiple rows of guiding slot 11.There are two guiding slots 11, guiding slot one end and brill in every row's guide groove
Hole connection.Two guiding slots respectively along with drilling vertical direction in coal seam to extending at left and right sides of drilling.In guiding slot
Outer end opens up coal bed gas extraction borehole 13.A coal bed gas extraction borehole 13 is each side opened up in drilling 9-2.
Then arrangement supervisor 9 in drilling 9-2, using conventional method high pressure sealing of hole, 10 length of injection hole sealing section is 5-20 m.
Then it is anti-reflection freeze thawing fracturing to be carried out to coal seam 12 using pulsating cyclic freeze thawing equipment group 14.Specifically frozen-thaw process is：
Liquid low temperature medium tank car total valve 1-1 is opened, the liquid low temperature medium that liquid low temperature medium tank car 1 exports passes through
Gasifier 2 is converted into gas.As shown in Fig. 2, gasifier 2 is star fin 2-3 structure.Increase the gasification speed of liquid low temperature medium
Rate and vapor pressure, gas enter liquid low temperature medium vapor lamp 2-2 by gasifier entrance 2-1, pass through gasifier after gasification
Outlet 2-4 is connected to Pneumatic booster pump 3.Pneumatic booster pump 3 is pressurized using nitrogen/carbon dioxide of gasification, all the way gas
To drive gas source 3-1, gas is to observe pressure size, gas after gasification by boost pressure ga(u)ge 3-3 by pressurization air source 3-2 all the way
Body enters high pressure current stabilization air storage chamber 4 after being pressurized by Pneumatic booster pump 3.High pressure current stabilization air storage chamber 4 and ripple regulator 5 combine work
Make to export regulatable pulsation high pressure gas.Open ripple regulator 5, liquid low temperature medium tank car divides valve 1-2 and pulsation injecting liquid
State pumps for cryogenic media 6 carries out high-pressure pulsating fluid injection state cryogenic media fracturing, the liquid low temperature of pulsation by 9 pairs of coal seams 12 of supervisor
Along guiding 11 seepage flow of slot into coal seam, the high pressure gas that liquid low temperature medium gasifies in coal seam forms high pressure gas and causes medium
It splits, freezing moisture phase change expansion in coal seam is ice, forms frost heave fracturing.Stop injection liquid low temperature medium after 10min, freezes coal
Body absorbs formation temperature and gradually melts, to form the circulating freezing resistance effect in coal seam.After thawing, in next Frozen-thawed cycled
Before, High-pressure air valve 7 is opened to 9 gas injections of supervisor and carries out note high pressure gas 10min, promotes water flow and cooling capacity transmitting, freeze thawing is connected
Crack and expansion freeze thawing range.According to the number of freezing and thawing of setting（Such as 5 times or 10 inferior）, repeat pulsation injecting liquid state cryogenic media
Freeze thawing and high pressure gas actuation step, dredge crack, promote cryogenic energy transmitting, achieve the effect that circulating freezing resistance, coal seam
Reach the limiting range of stress during fatigue loading repeatedly, forms good coal bed gas extraction Fracture Networks.
The arrangement progress watt of coal bed gas extraction borehole 13 within the scope of the anti-reflection region of fracturing, 9 two sides about 20-35 m of distance supervisor
This extraction.Changed during extraction according to gas pumping effect, the number of control loop fluid injection nitrogen, in pulsation liquid low temperature medium
Under the influence of fracturing, high pressure gas fracturing, frost heave fracturing and the multiple fracturing of low temperature fracturing, promote the effective communication of Fracture Networks, it is real
The efficient extraction and utilization of existing coal bed gas.
Embodiment two,
As shown in Figure 4, Figure 5, a layer uplink drilling pulsating cyclic being worn for low level lane 15-1, liquid cryogenic media freeze thawing increasing is perfused
Saturating pumping and mining pressure relief mash gas, is basically the same as the first embodiment.Different piece predominantly wears layer to superjacent 12 from low level lane 15-1
Circulation note pulsation liquid low temperature medium is implemented in the middle anti-reflection region of freeze thawing, and 9 depth of supervisor should penetrate rock stratum into coal seam 12, according to coal
Thickness degree supervisor 9 should squeeze into coal seam 10m ~ 100m.Rest part and embodiment one are all identical, and same section omits.
Embodiment three,
As shown in figs. 4 and 6, layer downlink drilling anti-reflection pumping of circumfusion liquid low temperature medium freeze thawing is worn for high position lane 15-2
Mining pressure relief mash gas is basically the same as the first embodiment.Different piece is predominantly worn layer from high-order lane 15-2 and is frozen in coal seam 12 to the lower part
Melt anti-reflection region and implement circulation fluid injection state cryogenic media, 9 depth of supervisor should penetrate rock stratum into coal seam 12, according to coal seam thickness master
Pipe 9 should squeeze into coal seam 10m ~ 100m.Rest part and embodiment one are all identical, and same section omits.
Claims (5)
1. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing, step are：
Step 1, in coal seam, constructed in coal seam using water jet slotting process formation one drilling and multiple rows of guiding slot,
Have two guiding slots in every row, drilling described in the guiding slot connection and in coal seam along with drilling vertical direction to drilling two
Side extends；Coal bed gas extraction borehole is opened up in guiding slot outer end；
Step 2 injects liquid low temperature medium to drilling and each guiding slot mesohigh pulsation, using pulsating cyclic low temperature freeze thawing side
Method is anti-reflection to coal seam progress freeze thawing fracturing, forms coal bed gas extraction Fracture Networks；
The pulsating cyclic low temperature freezing-thawing method is anti-reflection to coal seam progress freeze thawing fracturing, and step is：
A, to drilling and each guiding slot mesohigh pulsation injection liquid low temperature medium, until the single liquid low temperature medium note of setting
The angle of incidence stops the injection of liquid cryogenic media；With injection process, the moisture in coal seam is frozen into ice, generates frost heave fracturing
Effect；
B, freeze coal body absorption formation temperature gradually to melt, to form the circulating freezing resistance effect in coal seam；
C, after the coal seam freezed is dissolved, to drilling and each guiding slot mesohigh gas injection, promote water flow and cooling capacity transmitting, lead
Logical freeze thawing crack and expansion freeze thawing range；
D, according to the freezing-thawing cycles of setting, circulation executes step a~step c；
Step 3 passes through coal bed gas extraction borehole extraction coal bed gas.
2. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing according to claim 1, feature
It is：The liquid low temperature medium is liquid nitrogen or liquid carbon dioxide.
3. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing according to claim 1, feature
It is：The single liquid low temperature medium injection length is 10min.
4. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing according to claim 1, feature
It is：The freezing-thawing cycles are 5-10 times.
5. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing according to claim 1, feature
It is：The high-pressure gas injection, gas injection time 10min.
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