CN106337672A - Method for extracting coal bed gas from circulating pulse type low temperature freeze-thawed anti-reflection coal - Google Patents
Method for extracting coal bed gas from circulating pulse type low temperature freeze-thawed anti-reflection coal Download PDFInfo
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- CN106337672A CN106337672A CN201610938189.8A CN201610938189A CN106337672A CN 106337672 A CN106337672 A CN 106337672A CN 201610938189 A CN201610938189 A CN 201610938189A CN 106337672 A CN106337672 A CN 106337672A
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- 239000003245 coal Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000010257 thawing Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000000605 extraction Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims description 75
- 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
- 125000004122 cyclic group Chemical group 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 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
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract 1
- 230000010349 pulsation Effects 0.000 description 11
- 238000002309 gasification Methods 0.000 description 10
- 230000006378 damage Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229960004424 carbon dioxide Drugs 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000005065 mining 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
- 238000009825 accumulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 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
- 230000010412 perfusion Effects 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
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation 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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- 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)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a method for extracting coal bed gas from circulating pulse type low temperature freeze-thawed anti-reflection coal. Firstly, a borehole and multiple rows of guiding slots are constructed in a coal bed, the guiding slots are communicated with the borehole and extend to two sides of the borehole in the direction perpendicular to the borehole in the coal bed, and coal bed gas extraction boreholes are formed at the outer ends of the guiding slots. A liquid low-temperature medium is injected into the borehole and the guiding slots in a high-pressure pulse mode, the coal bed is freeze-thawed by adopting a pulse circulating low temperature freeze-thawing method to fracture for increasing reflection, and a coal bed gas extraction fracture network is thus formed. Coal bed gas is extracted via the coal bed gas extraction boreholes. By combining freeze-thawing erosion with coal bed gas extraction and combining pulse circulating injection of the liquid low-temperature medium with freeze-thawing phase change fracture, the method significantly improves the anti-reflection efficiency of coal. The method is simple, feasible and low in construction cost, can effectively improve the single-pore extraction quantity and extraction concentration of coal bed gas and prolong the attenuation time of gas concentration, and is particularly suitable for coal bed gas extraction in low-osmosis and high-gas bearing coal beds.
Description
Technical field
The present invention relates to a kind of method of extraction coal bed gas, especially a kind of cycle pulse formula low temperature freeze thawing is anti-reflection, and coal body is taken out
The method of mining coal seam gas.
Technical background
Coal bed gas as a kind of unconventional energy resource, in many countries as a kind of fungible energy source, Coalbed Methane In China total amount
Greatly, suitable with natural gas resource total amount, with the increase of mining depth, the coal bed gas content in coal seam, pressure are also gradually increased, coal
Layer permeability is gradually reduced, and the Gas Disaster such as coal bed gas blast, coal and gas prominent is also on the rise.Due to China's coal seam reservoirs
Hypotonicity, overcomes the problem that coal bed gas extraction concentration is low, pumping volume is little to be always the most important thing administering Gas Disaster, at present
Adopting fracturing, hydraulic slotted liner technique, standing etc. the single coal bed extraction coal bed gas traditional method of deep more.Above-mentioned coal bed gas is taken out
Scope that mining method is anti-reflection little it is impossible to form the crack passage of coal bed gas extraction on a large scale, lead to that coal bed gas extraction rate is low, coal bed gas is controlled
Reason effect is undesirable.
Freeze-thaw erosion is the volumetric expansion because the moisture in soil and its matrix hole or in rock fracture is when freezing,
So that crack is increased therewith, increase the led to monoblock soil body or phenomenon that rock is chipping.The thawing repeatedly that freeze-thaw erosion causes
With freeze, lead to the destruction of the soil body or rock mass, disturbance, deformation even mobile, cause the heavy damage of object configurations.Freeze thawing phenomenon
It is a kind of common physico-geological function and phenomenon in nature, particularly occur in difference variation than in larger object configurations.
The appearance repeatedly of freeze-thaw cycle, causes the heavy damage of object configurations.Fracturing freeze-thaw erosion phenomenon being applied to coal body is anti-reflection
In, the damage Fracturing of freeze-thaw erosion can be given full play to.
At ambient pressure, liquid low temperature medium such as liquid nitrogen/carbon dioxide temperature, up to -196 DEG C/- 37 DEG C, gasifies pure for 21 DEG C
Expansion rate during nitrogen/carbon dioxide is respectively 696 times/585 times, can produce huge air pressure, liquid low temperature in the confined space
Medium gasification latent heat is respectively 5.56kj/mol and 5.34kj/mol, absorbable surrounding amount of heat during gasification.Liquid nitrogen/liquid two
Carbonoxide has the advantages that preparation is simple, raw material sources are extensive, and in coal body freeze-thaw cycle, liquid low temperature medium can be used as one kind
Efficient refrigeration and anti-reflection medium.
Pulsation pressure break is compared static pressure pressure break and is had higher efficiency, how to work in coordination with pulsation liquid low temperature medium pressure break and freeze thawing
Damage is the key issue overcoming coal bed gas extraction efficiency low.
Content of the invention
The purpose of the present invention is to overcome deficiency of the prior art, provides a kind of low temperature freeze thawing anti-reflection coal body extraction coal bed gas
Method.The inventive method is based on the anti-reflection coal body of water jet slot pulsating cyclic low temperature freeze thawing, increases coal seam fracturing scope and effect
Rate, promotes the formation of Fracture Networks, is remarkably improved coal bed gas extraction amount.
A kind of method of coal body extraction coal bed gas that cycle pulse formula low temperature freeze thawing is anti-reflection, comprises the following steps:
Step 1, in coal seam, using water jet slotting process construct in coal seam formation one boring and multiple rows of guiding slot,
Often arrange in have two guiding slots, described in described guiding slot UNICOM boring and in coal seam along and boring vertical direction to boring two
Side extends.Open up coal bed gas extraction borehole in guiding slot outer end.
Step 2, injection liquid low temperature medium of pulsing to boring and each guiding slot mesohigh, using pulsating cyclic low-temperature frozen
Melting method, that coal seam is carried out with freeze thawing fracturing is anti-reflection, forms coal bed gas extraction Fracture Networks.
Step 3, pass through coal bed gas extraction borehole extraction coal bed gas.
It is anti-reflection that described pulsating cyclic low temperature freezing-thawing method carries out freeze thawing fracturing to coal seam, the steps include:
A, injection liquid low temperature medium of pulsing to boring and each guiding slot mesohigh, to the single liquid low temperature medium note setting
The angle of incidence, stops the injection of liquid cryogenic media；With injection process, the moisture in coal seam is frozen into ice, produces frost heave fracturing
Effect.
B, freeze coal body absorb formation temperature gradually melt, thus forming the circulating freezing resistance effect in coal seam.
After c, the coal seam freezed are dissolved, to boring and the slot mesohigh gas injection of each guiding, water flow and cold is promoted to pass
Pass, turn on freeze thawing crack and expand freeze thawing scope.
D, according to set freezing-thawing cycles, circulate execution step a～step c.
Described liquid low temperature medium can be the inertia cryogenic media such as liquid nitrogen, liquid carbon dioxide.
Optimally, described single liquid low temperature medium injection length is 10min.
Described freezing-thawing cycles cycle-index is 5-10 time.
Described high-pressure gas injection, gas injection time is 10min.
Beneficial effect:
The inventive method, is combined freeze-thaw erosion phenomenon with coal bed gas extraction, and the inferior position innovatively freezing-thawing damage destroyed turns
Turn to advantage, pulsating cyclic fluid injection state cryogenic media and freeze thawing phase transformation fracturing are combined, two methods of collaborative efficient utilization, significantly
Improve the anti-reflection efficiency of coal body.
Pulsating cyclic injects liquid low temperature medium, can produce freeze thawing fracturing, gases at high pressure fracturing, three kinds of fracturing effects of low temperature fracturing
Really.The boosting gas injection process of high pressure gas, can produce high pressure gas fracturing effect, and can increase the diffusion of cold and expand freeze thawing cause
Split scope.Coal-bed gas single hole extraction amount and extraction concentration can be effectively improved after circulating freezing resistance, extend gas density decay
Time.Because pulsation freeze thawing medium can penetrate in coal seam well, can effectively eliminate coal seam office after pulsation freeze thawing is anti-reflection
Portion's high stress concentration zone, promotes the migration of local accumulation gas, in release coal seam, the coal and gas prominent potential of accumulation, has very
Good elimination coal and gas prominent effect.Additionally, liquid low temperature medium not only has efficient gasification expansion efficiency, gasification is simultaneously
Also absorb coal seam amount of heat, to coal body fire extinguishing, there is positive effect.It is low ventilative that the inventive method efficiently solves high methane
Coal seam permeability improves the key issue inconspicuous, fracturing scope is little, has wide applicability.
Brief description
Fig. 1 is the cycle pulse formula low temperature freeze thawing anti-reflection coal body extraction coal bed gas method schematic diagram based on water jet slot.
Fig. 2 is the gasifier structural representation in Fig. 1.
Fig. 3 is Pneumatic booster pump schematic diagram in Fig. 1.
Fig. 4 is a-a section pipeline and boring 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 is 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 drives source of the gas, 3-2 by pressurization air source, 3-3 boost pressure ga(u)ge,
3-4 pressurization gas export, 4 high pressure current stabilization air storage chambers, 5 ripple regulator, 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- is responsible for, 9-1- floral tube, 9-
2- holes, 10- sealing of hole sections, and 11- guides slot, 12- coal seam, 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
Below in conjunction with the accompanying drawings the specific embodiment of the invention is further described.
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 boring 9-2 and multiple rows of guiding slot 11.Often there are two guiding slots 11, guiding slot one end and brill in row's gathering sill
Hole UNICOM.Two guiding slots extend to the boring left and right sides in coal seam along with boring vertical direction respectively.In guiding slot
Outer end opens up coal bed gas extraction borehole 13.Boring 9-2 each side open up a coal bed gas extraction borehole 13.
Then arrange supervisor 9 in boring 9-2, using conventional method high pressure sealing of hole, injection hole sealing section 10 length is 5-20 m.
Then using pulsating cyclic freeze thawing equipment group 14, freeze thawing fracturing is carried out to coal seam 12 anti-reflection.Concrete frozen-thaw process is:
Open liquid low temperature medium tank car total valve 1-1, the liquid low temperature medium of liquid low temperature medium tank car 1 output is through gasification
Device 2 is converted into gas.As shown in Fig. 2 gasifier 2 is star fin 2-3 structure.Increase liquid low temperature medium gasification rate and
Vapor pressure, gas enters liquid low temperature medium vapor lamp 2-2 by gasifier entrance 2-1, passes through gasifier exit after gasification
2-4 is connected to Pneumatic booster pump 3.Pneumatic booster pump 3 is pressurized using the nitrogen/carbon dioxide of gasification, and a road gas is to drive
Take offence source 3-1, and a road gas is by pressurization air source 3-2, observes pressure size by boost pressure ga(u)ge 3-3, after gasification, gas leads to
High pressure current stabilization air storage chamber 4 is entered after crossing Pneumatic booster pump 3 supercharging.High pressure current stabilization air storage chamber 4 and ripple regulator 5 associated working are defeated
Go out regulatable pulsation gases at high pressure.Open ripple regulator 5, liquid low temperature medium tank car divides valve 1-2 and pulsation injecting liquid state low
Warm medium pump 6, carries out high-pressure pulsating fluid injection state cryogenic media fracturing, the liquid low temperature medium of pulsation by being responsible for 9 to coal seam 12
Along guiding slot 11 seepage flow in coal seam, in coal seam, the gases at high pressure of liquid low temperature medium gasification form high pressure gas fracturing, freeze
In knot coal seam, moisture phase change expansion is ice, forms frost heave fracturing.Stop injection liquid low temperature medium after 10min, freeze coal body and inhale
Receive formation temperature gradually to melt, thus forming the circulating freezing resistance effect in coal seam.Melt after terminating, before next freeze-thaw cycle,
Open High-pressure air valve 7 and carry out noting high pressure gas 10min to being responsible for 9 gas injections, promote water flow and cold transmission, turn on freeze thawing crack
With expansion freeze thawing scope.According to the number of freezing and thawing (such as 5 times, or 10 inferior) setting, repeat pulsation injecting liquid state cryogenic media freeze thawing
With high pressure gas actuation step, crack is dredged, promote cryogenic energy transmission, reach the effect of circulating freezing resistance, coal seam is anti-
Reach the limiting range of stress during multiple fatigue loading, form good coal bed gas extraction Fracture Networks.
In the anti-reflection region of fracturing, in the range of distance supervisor 9 about 20-35 m both sides, arrangement coal bed gas extraction borehole 13 is carried out watt
This extraction.Changed according to gas pumping effect during extraction, control the number of times of circulation fluid injection nitrogen, in pulsation liquid low temperature medium
Under the influence of fracturing, gases at high pressure fracturing, frost heave fracturing and the multiple fracturing of low temperature fracturing, promote the effective communication of Fracture Networks, real
The efficient extraction of existing coal bed gas and utilization.
Embodiment two,
As shown in Figure 4, Figure 5, it is that low level lane 15-1 wears layer up boring pulsating cyclic perfusion liquid cryogenic media freeze thawing is anti-reflection takes out
Mining pressure relief mash gas, essentially identical with embodiment one.Different piece predominantly from low level lane 15-1 wear layer to superjacent 12 freeze
Melt anti-reflection region and implement circulation note pulsation liquid low temperature medium, supervisor's 9 depth should penetrate rock stratum in coal seam 12, thick according to coal seam
Degree supervisor 9 should squeeze into coal seam 10m ~ 100m.Remainder is all identical with embodiment one, and same section is slightly.
Embodiment three,
As shown in Fig. 4, Fig. 6, wear the layer descending boring anti-reflection extraction of circumfusion liquid low temperature medium freeze thawing for high-order lane 15-2 and unload
Pressure gas, essentially identical with embodiment one.Different piece is predominantly worn layer from high-order lane 15-2 and is increased to freeze thawing underlying seam 12
Circulation fluid injection state cryogenic media is implemented in region thoroughly, and supervisor's 9 depth should penetrate rock stratum in coal seam 12, be responsible for 9 according to coal seam thickness
Coal seam 10m ~ 100m should be squeezed into.Remainder is all identical with embodiment one, and same section is slightly.
Claims (6)
1. a kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing, the steps include:
Step 1, in coal seam, using water jet slotting process construct in coal seam formation one boring and multiple rows of guiding slot,
Often arrange in have two guiding slots, described in described guiding slot UNICOM boring and in coal seam along and boring vertical direction to boring two
Side extends；Open up coal bed gas extraction borehole in guiding slot outer end；
Step 2, injection liquid low temperature medium of pulsing to boring and each guiding slot mesohigh, using pulsating cyclic low temperature freeze thawing side
It is anti-reflection that method carries out freeze thawing fracturing to coal seam, forms coal bed gas extraction Fracture Networks；
Step 3, pass through coal bed gas extraction borehole extraction coal bed gas.
2. the method for the anti-reflection coal body extraction coal bed gas of a kind of cycle pulse formula low temperature freeze thawing according to claim 1, its feature
It is: it is anti-reflection that described pulsating cyclic low temperature freezing-thawing method carries out freeze thawing fracturing to coal seam, the steps include:
A, injection liquid low temperature medium of pulsing to boring and each guiding slot mesohigh, to the single liquid low temperature medium note setting
The angle of incidence, stops the injection of liquid cryogenic media；With injection process, the moisture in coal seam is frozen into ice, produces frost heave fracturing
Effect；
B, freeze coal body absorb formation temperature gradually melt, thus forming the circulating freezing resistance effect in coal seam；
After c, the coal seam freezed are dissolved, to boring and the slot mesohigh gas injection of each guiding, promote water flow and cold transmission, lead
Logical freeze thawing crack and expansion freeze thawing scope；
D, according to set freezing-thawing cycles, circulate execution step a～step c.
3. the method for the anti-reflection coal body extraction coal bed gas of a kind of cycle pulse formula low temperature freeze thawing according to claim 1 or claim 2, it is special
Levying is: described liquid low temperature medium is liquid nitrogen or liquid carbon dioxide.
4. the method for the anti-reflection coal body extraction coal bed gas of a kind of cycle pulse formula low temperature freeze thawing according to claim 2, its feature
It is:, described single liquid low temperature medium injection length is 10min.
5. the method for the anti-reflection coal body extraction coal bed gas of a kind of cycle pulse formula low temperature freeze thawing according to claim 2, its feature
It is: described freezing-thawing cycles cycle-index is 5-10 time.
6. the method for the anti-reflection coal body extraction coal bed gas of a kind of cycle pulse formula low temperature freeze thawing according to claim 2, its feature
It is: described high-pressure gas injection, gas injection time is 10min.
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