CN107476807A - A kind of coal seam tight roof fracturing method for weakening - Google Patents
A kind of coal seam tight roof fracturing method for weakening Download PDFInfo
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- CN107476807A CN107476807A CN201710933990.8A CN201710933990A CN107476807A CN 107476807 A CN107476807 A CN 107476807A CN 201710933990 A CN201710933990 A CN 201710933990A CN 107476807 A CN107476807 A CN 107476807A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/14—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids
Abstract
The invention discloses a kind of coal seam tight roof fracturing method for weakening, comprise the following steps：First fracturing hole is drilled through to top plate, then liquid nitrogen is injected into roof strata with pulsating using insulation casing, pulsating fatigue damages and the coupling of liquid nitrogen cryogenics cold shock can significantly weaken roof strata self-strength, crack is formed around fracturing hole when vapor pressure exceedes rock stratum tensile strength, is finally recycled nitrogen.This method integrates fatigue weakening, cold shock and gasification expansion three's advantage, the gas-liquid two-phase flowing pressure group on the one hand constantly increased by the volume formed in the drilling confined space, rock stratum internal temperature rapid drawdown is induced thermal stress and produces；On the other hand, pulsating method for implanting causes nitrogen biphase gas and liquid flow to flow in crack rapidly, accelerates crack propagation speed, finally realizes effectively being caving for roof strata.This method construction is simple is convenient, and cost is relatively low, applied widely.
Description
Technical field
The present invention relates to a kind of coal seam tight roof fracturing method for weakening, is primarily adapted for use in rich in clay matrix, fine and close heavily fortified point
Hard difficulty collapse roof strata effective caving work in, can combine pulsating fatigue weakening characteristic, liquid nitrogen cryogenics cold shock effect,
The advantage of the aspect of gas fracturing effect three, realizes that roof strata high efficiency is caving.
Background technology
In China, high intensity, big thickness, the tight roof of preferable globality are distributed widely in each mining area.With coal
The exploitation of charcoal resource and the iterative method of working face, the top plate area of suspension roof that stope is internally formed gradually increase, if cannot
Effectively it is caving, the supporting intensity and difficulty in stope region will certainly be increased.In the progradation of working face, tight roof rock stratum
Periodic weighting or First Weighting Interval of Main constantly increase, and substantial amounts of energy is constantly gathered, when the load and top plate of overlying rock
Rock stratum deadweight sum, i.e. σOverlying+GDeadweight, more than the ultimate strength σ of roof stratausWhen, overall fracture will occur and be caving, limited
Hurricane accident is easily induced in stope space, tunnel facility is destroyed and causes casualties, influence mine normal production progress.
At present, for the problem that is caving of hard and compact roof strata, passed through in traditional sense frequently with a series of pre- fracturing sides
Formula carries out overhead caving, makes to produce crack inside fine and close globality roof strata, is caving its bulk, avoids the hair of hurricane accident
It is raw.Common pre- fracturing mode has deep hole blasting, high-pressure hydraulic pressure break, water filling reduction etc..There is certain for these technologies
Limitation, for example, shock wave caused by deep hole blasting easily triggers coal and rock stress disturbance, it is often accompanied by miss-firing or phenomena such as miso-fire
Occur；High-pressure hydraulic pressure break and water filling reduction consume substantial amounts of water resource, and the water resource that with the addition of chemical reagent is easier to make
Into pollution, in addition, when containing substantial amounts of clay inside roof strata, clay water swelling is easily caused, does not reach fracturing and collapses
The effect fallen.Therefore, for the roof strata rich in clay matrix effectively being caving, need badly a kind of cost it is relatively low, it is easy to operate,
The good fracturing method of effect avoids the generation of hurricane accident that tight roof large area caving is triggered.
The content of the invention
Goal of the invention：Problem effectively is caving the present invention be directed to the tight roof rock stratum rich in clay matrix, is proposed
Coal seam tight roof fracturing method for weakening, this method can make full use of liquid nitrogen under cryogenic, be injected using pulsating
Method, reduction fracturing is carried out to roof strata.
To achieve these goals, present invention employs following technical scheme：A kind of coal seam tight roof fracturing reduction
Method, comprise the following steps：
A, drill：After actual mining elapses a segment distance forward, collapsed hard top to the difficulty in stope region using rig
Multiple fracturing holes and pilot hole are drilled through inside slate layer, fracturing hole and pilot hole are spaced, and waterpower is utilized on fracturing hole top
Slotting device cuts out wedge-shaped slot；
B, prepared by liquid nitrogen：Air compressor is connected by exhaust pipe with cooling unit, negative pressure is installed on exhaust pipe
Blower fan, air is compressed by air compressor, compressed air via cooling unit cooling liquid, and then forms liquid
Nitrogen, then by liquid nitrogen storage in liquid nitrogen storage tank；
C, sealing of hole：First insulation casing is inserted in fracturing hole, then the high compression swelling hole packer of gas injection is extend into insulation casing
It is interior, the length that depth is less than insulation casing is stretched into, between insulation casing outer wall and fracturing hole inwall, insulation casing inwall and gas injection
Carry out cohering closure by ethylene glycol antifreeze between high compression swelling hole packer outer wall, finally pass through fracturing pipe and muffler
The high compression swelling hole packer of gas injection is simultaneously extend into fracturing hole, and return-air stop valve is installed on muffler；
D, pulsation injection liquid nitrogen：Liquid nitrogen storage tank is connected with liquid injection pipe, on liquid injection pipe install topping-up pump, equivalent current divider and
Pressure gauge, liquid injection pipe is connected by one-way cock with fracturing pipe, closes return-air stop valve, open the feed flow on liquid nitrogen storage tank
Valve, the liquid nitrogen in liquid nitrogen storage tank is injected into fracturing hole by liquid injection pipe and fracturing pipe, as pressure gauge numerical value P>During 2.5MPa,
The electric machine frequency of topping-up pump is adjusted to by 4Hz, and injection liquid nitrogen ten minutes into fracturing hole by frequency modulator, then passes through frequency modulator
The electric machine frequency of topping-up pump is gradually heightened, the electric machine frequency for often heightening a topping-up pump just injects liquid nitrogen very into fracturing hole
Clock, until pressure gauge numerical value P<During 0.5MPa, topping-up pump and supplying valve are closed；
E, nitrogen recycling：Muffler is connected to exhaust pipe, after pulsation injection liquid nitrogen process terminates, return-air is opened and cuts
Only valve, by nitrogen by negative-pressure air fan extraction to extraction pipeline, perform liquid nitrogen preparation process.
F, constantly elapsing forward with stope, successively according to above-mentioned steps a to e, is there is roof strata
Effect is across falling.
Further, the spacing between the fracturing hole and pilot hole is 4~5m.
Further, the fracturing hole and guiding orifice angle are inclined upwardly 30~60 ° along goaf direction, hole depth 8-
10m, aperture 30-35cm.
Further, the fracturing pipe, liquid injection pipe, muffler use frost-cracking-preventing seamless steel pipe, in frost-cracking-preventing seamless steel
The rock wool containing insulating characteristicses, asbestos or glass fibre are cased with inside pipe.
Further, the temperature controlling range of the cooling unit is -250~-10 DEG C.
Further, antirust agent is added with the ethylene glycol antifreeze.
Further, the blast control range of the negative-pressure air fan is -0.8MPa~-1.2MPa, in negative-pressure air fan inlet air
Mouth one air cleaner of arrangement, prevents rock stratum disintegrating slag enters in negative-pressure air fan from breaking down.
Further, in step d, the electric machine frequency of the topping-up pump heightens 4Hz every time.
Beneficial effect：Used above-mentioned technical proposal, being can be by pulsating fatigue weakening characteristic, liquid nitrogen cryogenics cold shock
Effect, the aspect of gas fracturing effect three carry out organic coupling, and then solve the hard globality roof strata rich in clay matrix.
Fracturing medium sources are extensive used in this method, account for 78% in an atmosphere, using air compressor and freeze unit by gaseous nitrogen atmosphere
Mutually become liquid nitrogen, the nitrogen after acting on can also be recycled, and will not cause environmental pollution.In mechanism of action side
Face, on the one hand by different injected frequencies, liquid nitrogen is caused different degrees of cold shock to roof strata, cause temperature inside rock stratum
Rapid drawdown is spent, the zone of action forms certain thermograde, and rock stratum itself is weakened under fatigue accumulation and temperature stress coupling mechanism
Intensity；Another aspect liquid nitrogen gasification constantly produces nitrogen, and the gas-liquid two-phase that volume constantly increases is formed in the drilling confined space
Blend pressure group, the tensile strength for eventually exceeding rock stratum form crack.In addition, with the continuous extension in crack, pulsating injection
Method causes biphase gas and liquid flow to flow in crack rapidly, accelerates crack propagation speed, finally realizes effectively collapsing for roof strata
Fall.This method construction is simple is convenient, and cost is relatively low, applied widely.
Brief description of the drawings
Fig. 1 is the schematic diagram of tight roof fracturing method for weakening in coal seam of the present invention；
Fig. 2 is that coal seam tight roof causes drilling schematic diagram；
Fig. 3 is insulation casing diagrammatic cross-section；
In Fig. 1：1-difficulty collapses tight roof rock stratum；2-fracturing hole；2-1 wedge shape slots；3-pilot hole；4-fracturing pipe；
5-insulation casing；The high compression swelling hole packer of 6-gas injection；7-pressure gauge；8-one-way cock；9-liquid injection pipe；10-equivalent point
Flow device；11-topping-up pump；12-frequency modulator；13-supplying valve；14-return-air stop valve；15-liquid nitrogen storage tank；16-liquid nitrogen；
17-muffler；18-exhaust pipe；19-negative-pressure air fan；20-cooling unit；21-air compressor；
In Fig. 2：1-difficulty collapses tight roof rock stratum；2-fracturing hole；3-pilot hole；22- stopes；I-mined out
Area；II-coal seam；III-tunnel；IV-stope region；
In Fig. 3：5-1-tube wall；5-2-tube chamber.
Embodiment：
Further explanation is done to the present invention below in conjunction with the accompanying drawings.
As illustrated in fig. 1 and 2, a kind of coal seam tight roof fracturing method for weakening of the invention, comprises the following steps：
A, drill：After stope 22 elapses a segment distance forward, collapsed using rig to the difficulty in stope region hard
Multiple fracturing holes 2 and pilot hole 3 are drilled through inside roof strata 1, fracturing hole 2 and pilot hole 3 are spaced, on the top of fracturing hole 2
Wedge-shaped slot 2-1 is cut out using hydraulic slotted liner technique device；
B, prepared by liquid nitrogen：Air compressor 21 is connected by exhaust pipe 18 with cooling unit 20, on exhaust pipe 18
Negative-pressure air fan 19 is installed, is compressed air by air compressor 21, compressed air via the cooling coolant of unit 20
Change, and then form liquid nitrogen 16, then liquid nitrogen 16 is stored in liquid nitrogen storage tank 15；
C, sealing of hole：First insulation casing 5 is inserted in fracturing hole 2, as shown in figure 3, the tube wall 5-1 of insulation casing 5 is in ripple
Shape, then the high compression swelling hole packer 6 of gas injection is extend into the tube chamber 5-2 of insulation casing 5, depth is stretched into less than insulation casing 5
Length, between the outer wall of insulation casing 5 and the inwall of fracturing hole 2, the inwall of insulation casing 5 and the high outer wall of compression swelling hole packer 6 of gas injection it
Between carry out cohering closure by ethylene glycol antifreeze, antirust agent is added with the ethylene glycol antifreeze, ethylene glycol antifreeze can
The inwall of fracturing hole 2 is infiltrated into block the wall of a borehole facial cleft gap, so as to ensure air-tightness, is finally worn fracturing pipe 4 and muffler 17
Cross the high compression swelling hole packer 6 of gas injection and extend into fracturing hole 2, return-air stop valve 14 is installed on muffler 17；
D, pulsation injection liquid nitrogen：Liquid nitrogen storage tank 15 is connected with liquid injection pipe 9, topping-up pump 11, equivalent point are installed on liquid injection pipe 9
Device 10 and pressure gauge 7 are flowed, liquid injection pipe 9 is connected by one-way cock 8 with fracturing pipe 4, closes return-air stop valve 14, opens liquid nitrogen
Supplying valve 13 on storage tank 15, the liquid nitrogen 16 in liquid nitrogen storage tank 15 is injected into fracturing hole 2 by liquid injection pipe 9 and fracturing pipe 4,
As the numerical value P of pressure gauge 7>During 2.5MPa, the electric machine frequency of topping-up pump 11 is adjusted to by 4Hz by frequency modulator 12, and into fracturing hole 2
Inject liquid nitrogen 160 minutes, the electric machine frequency of topping-up pump 11 is then gradually heightened by frequency modulator 12, it is preferred that the topping-up pump
11 electric machine frequency heightens 4Hz every time, i.e., progressively heightens the electric machine frequency of topping-up pump 11 to 8Hz, 12Hz, 16Hz, 20Hz ...,
Often heighten the electric machine frequency of a topping-up pump 11 and liquid nitrogen just injected into fracturing hole 2 160 minutes, in the process, on the one hand according to
By different injected frequencies, liquid nitrogen is caused different degrees of cold shock to rock stratum, cause rock stratum internal temperature rapid drawdown, rock stratum is rushed
Hit region and form certain thermograde, rock stratum self-strength is weakened under fatigue accumulation and temperature stress coupling mechanism, it is another
Aspect liquid nitrogen gasification constantly produces nitrogen, and the gas-liquid two-phase blend pressure that volume constantly increases is formed in the drilling confined space
Group, the tensile strength for eventually exceeding rock stratum form crack, and with the continuous extension in crack, pulsating method for implanting causes gas-liquid two
Mutually stream is flow in crack rapidly, accelerates crack propagation speed, finally realizes effectively being caving for rock stratum, the numerical value of pressure gauge 7 is with rock
Layer is caving and declined, until the numerical value P of pressure gauge 7<During 0.5MPa, topping-up pump 11 and supplying valve 13 are closed；
E, nitrogen recycling：Muffler 17 is connected to exhaust pipe 18, after pulsation injection liquid nitrogen process terminates, opened back
Gas stop valve 14, by nitrogen by the extraction of negative-pressure air fan 19 to extraction pipeline 18, perform liquid nitrogen preparation process.
F, as shown in Fig. 2 stope 22 constantly elapses forward along tunnel, stope 22 is every to elapse forward one
After segment distance, just form one piece of stope region, stope region rear be goaf, with actual mining towards continuous push away forward
Move, successively according to above-mentioned steps a to e, roof strata is carried out effectively across falling.
In the present embodiment, the spacing between the fracturing hole 2 and pilot hole 3 is 4~5m, and fracturing hole 2 and pilot hole 3
Inclination angle be 30~60 °, hole depth is 8~10m, and aperture is 30~35cm；The fracturing pipe 4, liquid injection pipe 9, muffler 18 are adopted
With frost-cracking-preventing seamless steel pipe, and the rock wool containing insulating characteristicses, asbestos or glass fibre are cased with inside frost-cracking-preventing seamless steel pipe；Institute
The temperature controlling range for stating cooling unit 20 is -250~-10 DEG C；The blast control range of the negative-pressure air fan 19 is -0.8MPa
~-1.2MPa, blower fan relevant parameter are specially：Air quantity is 3000m3/ h, rotating speed are 500 turns/min, a diameter of 800mm of fan blade,
An air cleaner is arranged in the air intake vent of negative-pressure air fan 19, prevents rock stratum disintegrating slag enters in negative-pressure air fan 19 from breaking down.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of coal seam tight roof fracturing method for weakening, it is characterised in that comprise the following steps：
A, drill：After stope (22) elapses a segment distance forward, collapsed hard top to the difficulty in stope region using rig
Multiple fracturing holes (2) and pilot hole (3) are drilled through inside slate layer (1), fracturing hole (2) and pilot hole (3) are spaced, in fracturing
Wedge-shaped slot (2-1) is cut out using hydraulic slotted liner technique device in hole (2) top；
B, prepared by liquid nitrogen：Air compressor (21) is connected by exhaust pipe (18) with cooling unit (20), exhaust pipe
(18) negative-pressure air fan (19) is installed on, is compressed air by air compressor (21), compressed air via cooler
Group (20) cooling liquid, and then liquid nitrogen (16) is formed, then liquid nitrogen (16) is stored in liquid nitrogen storage tank (15)；
C, sealing of hole：First insulation casing (5) is inserted in fracturing hole (2), then the high compression swelling hole packer (6) of gas injection is extend into thermal insulation
In sleeve pipe (5), the length that depth is less than insulation casing (5) is stretched into, between insulation casing (5) outer wall and fracturing hole (2) inwall, absolutely
Carry out cohering closure by ethylene glycol antifreeze between thermal sleeve (5) inwall and high compression swelling hole packer (6) outer wall of gas injection, most
Fracturing pipe (4) and muffler (17) through the high compression swelling hole packer (6) of gas injection and are extend into fracturing hole (2), muffler afterwards
(17) return-air stop valve (14) is installed on；
D, pulsation injection liquid nitrogen：Liquid nitrogen storage tank (15) is connected with liquid injection pipe (9), on liquid injection pipe (9) install topping-up pump (11), etc.
Current divider (10) and pressure gauge (7) are measured, liquid injection pipe (9) is connected by one-way cock (8) with fracturing pipe (4), return-air is closed and cuts
Only valve (14), the supplying valve (13) on liquid nitrogen storage tank (15) is opened, the liquid nitrogen (16) in liquid nitrogen storage tank (15) is passed through into liquid injection pipe
(9) it is injected into fracturing pipe (4) in fracturing hole (2), as pressure gauge (7) numerical value P>During 2.5MPa, it will be noted by frequency modulator (12)
The electric machine frequency of liquid pump (11) is adjusted to 4Hz, and injection liquid nitrogen (16) ten minutes in fracturing hole (2), then passes through frequency modulator
(12) electric machine frequency of topping-up pump (11) is gradually heightened, often heightens the electric machine frequency of a topping-up pump (11) just to fracturing hole (2)
Middle injection liquid nitrogen (16) ten minutes, until pressure gauge (7) numerical value P<During 0.5MPa, topping-up pump (11) and supplying valve (13) are closed；
E, nitrogen recycling：Muffler (17) is connected to exhaust pipe (18), after pulsation injection liquid nitrogen process terminates, opened back
Gas stop valve (14), by nitrogen by negative-pressure air fan (19) extraction to extraction pipeline (18), perform liquid nitrogen preparation process.
F, constantly elapsing forward with stope, successively according to above-mentioned steps a to e, make roof strata carry out effectively across
Fall.
A kind of 2. coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that the fracturing hole
(2) spacing between pilot hole (3) is 4~5m.
A kind of 3. coal seam tight roof fracturing method for weakening according to claim 2, it is characterised in that the fracturing hole
(2) it is inclined upwardly 30~60 °, hole depth 8-10m, aperture 30-35cm along goaf direction with pilot hole (3) angle.
A kind of 4. coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that the fracturing pipe
(4), liquid injection pipe (9), muffler (17) use frost-cracking-preventing seamless steel pipe, are cased with inside frost-cracking-preventing seamless steel pipe containing adiabatic special
Rock wool, asbestos or the glass fibre of property.
A kind of 5. coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that the cooling unit
(20) temperature controlling range is -250~-10 DEG C.
6. a kind of coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that the ethylene glycol is prevented
Freeze in liquid and be added with antirust agent.
A kind of 7. coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that：The negative-pressure air fan
(19) blast control range is -0.8MPa~-1.2MPa, and an air cleaner is arranged in negative-pressure air fan (19) air intake vent,
Prevent rock stratum disintegrating slag enters in negative-pressure air fan (19) from breaking down.
A kind of 8. coal seam tight roof fracturing method for weakening according to claim 1, it is characterised in that：It is described in step d
The electric machine frequency of topping-up pump (11) heightens 4Hz every time.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894782A (en) * | 2018-07-31 | 2018-11-27 | 中南大学 | A kind of low temperature frost heave fracturing induction ore body inbreak mining codes |
| CN109404039A (en) * | 2018-12-07 | 2019-03-01 | 西安科技大学 | A kind of device and method based on liquid nitrogen freezing method prevention and treatment coal bed drilling collapse hole |
| CN109556474A (en) * | 2018-12-10 | 2019-04-02 | 中北大学 | A method of cooled down using material and expands fracturing |
| CN109779597A (en) * | 2019-03-06 | 2019-05-21 | 绍兴文理学院 | The method and system of rock blast hazard prevention and control is realized using liquid nitrogen reduction coal body |
| CN110080764A (en) * | 2019-05-29 | 2019-08-02 | 河南理工大学 | Liquid nitrogen supercharging device, anti-reflection experimental system and experimental method using the device |
| CN110195580A (en) * | 2019-05-27 | 2019-09-03 | 煤科集团沈阳研究院有限公司 | A kind of gas-liquid two-phase synergy coal seam anti-reflection method |
| CN110685688A (en) * | 2019-09-27 | 2020-01-14 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
| CN110700829A (en) * | 2019-09-25 | 2020-01-17 | 中国矿业大学 | Pressure device based on frost heaving force |
| CN111173513A (en) * | 2020-03-16 | 2020-05-19 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
| CN111236907A (en) * | 2019-12-20 | 2020-06-05 | 中国矿业大学 | Liquid nitrogen circulating cold shock permeability increasing method based on multi-parameter monitoring |
| CN111980649A (en) * | 2020-07-24 | 2020-11-24 | 中国矿业大学 | Horizontal well low-temperature fluid enhanced heat exchange fracturing method |
| WO2021120701A1 (en) * | 2019-12-20 | 2021-06-24 | 翟成 | Coal seam permeability increasing method utilizing cyclic damage of liquid nitrogen cold impact and phase change gas |
| CN113107447A (en) * | 2021-04-14 | 2021-07-13 | 中煤科工集团重庆研究院有限公司 | Downhole porous section parallel dynamic fracturing system and construction method thereof |
| CN113338927A (en) * | 2021-05-28 | 2021-09-03 | 中国矿业大学 | Device based on liquid nitrogen-ice particle composite fracturing and method for breaking coal rock mass |
| CN117266820A (en) * | 2023-11-21 | 2023-12-22 | 太原理工大学 | Hydraulic fracture propagation azimuth control method based on liquid nitrogen cooling reservoir |
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| CN108894782A (en) * | 2018-07-31 | 2018-11-27 | 中南大学 | A kind of low temperature frost heave fracturing induction ore body inbreak mining codes |
| CN109404039A (en) * | 2018-12-07 | 2019-03-01 | 西安科技大学 | A kind of device and method based on liquid nitrogen freezing method prevention and treatment coal bed drilling collapse hole |
| CN109556474A (en) * | 2018-12-10 | 2019-04-02 | 中北大学 | A method of cooled down using material and expands fracturing |
| CN109779597A (en) * | 2019-03-06 | 2019-05-21 | 绍兴文理学院 | The method and system of rock blast hazard prevention and control is realized using liquid nitrogen reduction coal body |
| CN110195580A (en) * | 2019-05-27 | 2019-09-03 | 煤科集团沈阳研究院有限公司 | A kind of gas-liquid two-phase synergy coal seam anti-reflection method |
| CN110195580B (en) * | 2019-05-27 | 2022-04-05 | 煤科集团沈阳研究院有限公司 | Gas-liquid two-phase combined coal bed permeability increasing method |
| CN110080764A (en) * | 2019-05-29 | 2019-08-02 | 河南理工大学 | Liquid nitrogen supercharging device, anti-reflection experimental system and experimental method using the device |
| CN110080764B (en) * | 2019-05-29 | 2024-01-26 | 河南理工大学 | Liquid nitrogen supercharging device, anti-reflection experiment system using same and experiment method |
| CN110700829A (en) * | 2019-09-25 | 2020-01-17 | 中国矿业大学 | Pressure device based on frost heaving force |
| CN110685688B (en) * | 2019-09-27 | 2021-01-01 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
| CN110685688A (en) * | 2019-09-27 | 2020-01-14 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
| CN111236907A (en) * | 2019-12-20 | 2020-06-05 | 中国矿业大学 | Liquid nitrogen circulating cold shock permeability increasing method based on multi-parameter monitoring |
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Application publication date: 20171215 |