CN106285604A - A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method - Google Patents
A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method Download PDFInfo
- Publication number
- CN106285604A CN106285604A CN201610941193.XA CN201610941193A CN106285604A CN 106285604 A CN106285604 A CN 106285604A CN 201610941193 A CN201610941193 A CN 201610941193A CN 106285604 A CN106285604 A CN 106285604A
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- carbon dioxide
- microwave
- pressure break
- waveguide
- supercritical carbon
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/34—Arrangements for separating materials produced by the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
Abstract
A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method, system includes: liquid carbon dioxide storage tank, heater, booster pump, pressure break pipe and recovery tube, three phase separator, air compressor machine, cooler form a loop and realize supercritical carbon dioxide circulation pressure break, form fracture network in coal seam；Method: utilizing microwave heating coal seam and carbon dioxide to ensure that carbon dioxide is chronically at supercriticality, its heat effect also is able to fracturing coal body, dredging hole, promotes desorption of mash gas simultaneously.Supercritical carbon dioxide diffusibility is strong, easily gos deep into coal body hole, crack, simultaneously can displacement gas；Circulation pressure break effectively reduces operating cost and simplifies construction technology.Microwave radiation is combined by the present invention with supercritical carbon dioxide circulation pressure break, substantially increases coal seam porosity, permeability, promotes desorption of mash gas, thus gas pumping effect is greatly improved, have wide applicability in the art.
Description
Technical field
The present invention relates to a kind of microwave-assisted supercritical carbon dioxide circulation frac system and method, belong to underground coal mine pressure
Split correlative technology field, be particularly suited for soft high gas layer.
Background technology
China's coal seam height absorption, micropore, the feature of hyposmosis cause gas pumping difficulty, and gas accident takes place frequently.As
One ripe technology, fracturing can be effectively improved coal bed gas extraction effect, but existing hydraulic fracturing technology is made
Slit formula is single, be difficult to form fracture network, desorption effect is poor, fracturing fluid recyclability is poor for rush.Microwave can act in coal body
Water isopolarity molecule produces heat effect, tears coal body, dredges hole and promote desorption of mash gas.Supercritical carbon dioxide refers to two
Carbonoxide temperature-pressure is to the state of more than critical point (Tc=31.1 DEG C, Pc=7.38MPa), and have close to gas is low glutinous
Degree and high diffusibility, close to characteristics such as the high density of liquid and zero surface tension.Relative to conventional fracturing fluid, supercritical two
Carbonoxide fracturing fluid penetrating power is strong, easily enters the hole in coal, crack, thus produces fracture network, but, at underground coal mine
The supercriticality the efficient recovery that keep carbon dioxide become its technical bottleneck applied.Therefore, research is needed badly a kind of novel
Technology, it is possible to microwave radiation is combined with supercritical carbon dioxide circulation pressure break, reaches the quick fracturing of coal body, reaming, rush
The effect of desorbing.
Summary of the invention
Technical problem: it is an object of the invention to overcome weak point present in prior art, it is provided that a kind of method is simple,
Microwave-assisted supercritical carbon dioxide circulation frac system and the method for coal bed fracturing efficiency can be greatly improved.
Technical scheme: the microwave-assisted supercritical carbon dioxide circulation frac system of the present invention, is connected including with recovery tube
Three phase separator, the air compressor machine being connected with three phase separator, the cooler being connected with air compressor machine and the liquid being connected with cooler
State carbon dioxide storage tank, on the downside of liquid carbon dioxide storage tank pipeline connect having heaters, heater through pipeline one tunnel connect have with
The booster pump that pressure break pipe is connected, another road connects the waveguide switch being connected with coaxial waveguide, forms one and realizes supercritical
Carbon dioxide recycle pressure break, forms the loop of fracture network in coal seam；Microwave antenna it is connected with in described coaxial waveguide, described
Waveguide switch connects through rectangular waveguide microwave generator.
Use the microwave-assisted supercritical carbon dioxide circulation fracturing process of said system, comprise the following steps:
A, a pressure break boring of constructing to coal seam in tunnel, and two gas pumpings brills of constructing in pressure break boring both sides
Hole, the two ends of pressure break boring and mash gas pumping drilling lay respectively in top board and base plate；
B, in mash gas pumping drilling, send into drainage tube, in pressure break is holed, send into pressure break pipe, recovery tube and be connected with microwave
The coaxial waveguide of antenna, utilizes hole packer to seal pressure break boring and mash gas pumping drilling afterwards；
C, being connected on waveguide switch the outer end of coaxial waveguide, waveguide switch one end is through rectangular waveguide and microwave
Generator connects, and the waveguide switch other end is connected with heater by waveguide；
D, being connected on booster pump the outer end of pressure break pipe, booster pump is connected with heater through pipeline, heater warp
Pipeline is connected with liquid carbon dioxide storage tank；
E, the outer end of recovery tube being connected three phase separator, three phase separator is connected with air compressor machine, air compressor machine and cooling
Device connects, and cooler is connected with liquid carbon dioxide storage tank；
After f, pipeline have connected, open liquid carbon dioxide storage tank, make liquid carbon dioxide enter heater；
G, opening microwave generator, the microwave of generation enters waveguide switch by rectangular waveguide, and waveguide switch is by micro-
Wavelength-division is two-way, and coaxial waveguide of leading up to arrives microwave antenna and radiated in pressure break is holed by microwave antenna, another a-road-through
Cross waveguide and arrive heater, liquid carbon dioxide is heated；
H, startup booster pump, to the carbon dioxide pressurization after heating, form supercritical carbon dioxide, supercritical carbon dioxide
Entered in pressure break boring by pressure break pipe, pressure break is implemented in coal seam；
The microwave that i, microwave antenna give off, to coal seam and carbon dioxide continuous heating, makes carbon dioxide be in for a long time super
Critical state, coal seam at high temperature desorbs a large amount of gas, and gas pours into mash gas pumping drilling by the crack that pressure break produces, will
Gas pumping pipe is connected with fire damp pipe network, carries out gas pumping；
Residual gas in the boring of j, pressure break enters three phase separator by recovery tube, and three phase separator is by the coal in gas
Slag, water and gas filter out, and remaining carbon dioxide is compressed by air compressor machine and cooled down by cooler, finally returns to liquid
Carbon dioxide storage tank.
The operating frequency of described microwave generator is 2.45GHz, and power is 2kW.
Described liquid carbon dioxide heating-up temperature is more than 34 DEG C.
The described pressure to the carbon dioxide pressurization after heating is more than 8MPa.
Carbon dioxide should be supplemented when described liquid carbon dioxide storage tank liquid level is less than 1/3rd height of tank.
The boring of described pressure break is 3.5-4.5m with the distance of mash gas pumping drilling.
Beneficial effect: the supercritical carbon dioxide diffusibility of the present invention is strong, easily gos deep into coal body hole as fracturing fluid, splits
Gap, it is possible to effectively reduce initial cracking pressure；Supercritical carbon dioxide absorbability is better than gas, it is possible to forms competitive Adsorption thus drives
For the gas in coal；In microwave hole, radiation ensure that carbon dioxide is chronically at supercriticality, and its heat effect also can simultaneously
Enough fracturing coal bodies, dredging hole, promotion desorption of mash gas；Microwave is imported heater heating carbon dioxide, remaining titanium dioxide in hole
Carbon returns storage tank by air compressor machine, cooler thus forms circulation pressure break, effectively reduces operating cost and simplifies construction work
Skill.Microwave radiation is combined by the present invention with supercritical carbon dioxide circulation pressure break, substantially increases coal seam porosity, infiltration
Rate, promotes desorption of mash gas, thus gas pumping effect is greatly improved, and has practical widely in the art
Property.
Accompanying drawing explanation
Accompanying drawing 1 is the microwave-assisted supercritical carbon dioxide circulation frac system structural representation of the present invention.
In figure: 1-coal seam, 2-pressure break is holed, 3-mash gas pumping drilling, 4-top board, 5-base plate, 6-drainage tube, 7-microwave sky
Line, 8-coaxial waveguide, 9-pressure break pipe, 10-recovery tube, 11-hole packer, 12-waveguide switch, 13-rectangular waveguide, 14-microwave
Generator, 15-waveguide, 16-heater, 17-booster pump, 18-liquid carbon dioxide storage tank, 19-three phase separator, 20-pneumatics
Machine, 21-cooler.
Detailed description of the invention
Below in conjunction with the accompanying drawings one embodiment of the present of invention is further described:
As it is shown in figure 1, the present invention microwave-assisted supercritical carbon dioxide circulation frac system, including with recovery tube 10 phase
Three phase separator 19 even, the air compressor machine 20 being connected with three phase separator 19, the cooler 21 being connected with air compressor machine 20 and with cold
But the liquid carbon dioxide storage tank 18 that device 21 is connected, on the downside of liquid carbon dioxide storage tank 18, pipeline connects having heaters 16, heating
Device 16 connects through pipeline one tunnel the booster pump 17 being connected with pressure break pipe 9, and another road connects the waveguide being connected with coaxial waveguide 8
Transducer 12, forms one and realizes supercritical carbon dioxide circulation pressure break, form the loop of fracture network in coal seam；Described is same
Being connected with microwave antenna 7 in axle waveguide 8, described waveguide switch 12 connects through rectangular waveguide 13 microwave generator 14.
Use the microwave-assisted supercritical carbon dioxide circulation fracturing process of said system: first, to coal seam 1 in tunnel
The pressure break of constructing boring 2, and hole two mash gas pumping drillings 3 of 4 meters, 2 both sides construction in pressure break, pressure break boring 2 and gas are taken out
The two ends of borehole 3 lay respectively in top board 4 and base plate 5；Mash gas pumping drilling 3 is sent in drainage tube 6 one end, by microwave antenna
7 are connected with coaxial waveguide 8, and microwave antenna 7, coaxial waveguide 8, pressure break pipe 9 are sent into together with recovery tube 10 pressure break boring 2
In, utilize hole packer 11 that pressure break boring 2 and mash gas pumping drilling 3 are sealed；Meanwhile, by the outer end of coaxial waveguide 8 even
Connecing waveguide switch 12, waveguide switch 12 is connected with rectangular waveguide 13, and rectangular waveguide 13 is connected with microwave generator 14, described
The operating frequency of microwave generator 10 is 2.45GHz, and power is 2kW.It addition, waveguide switch 12 is by waveguide 15 and heater
16 connect.Afterwards, the outer end of pressure break pipe 9 being connected booster pump 17, booster pump 17 is connected with heater 16, heater 16 and liquid
State carbon dioxide storage tank 18 connects；The outer end of recovery tube 10 is connected three phase separator 19, three phase separator 19 and air compressor machine
20 connect, and air compressor machine 20 is connected with cooler 21, and cooler 21 is connected with liquid carbon dioxide storage tank 18.
After pipeline has connected, open liquid carbon dioxide storage tank 18, make liquid carbon dioxide enter heater 16；So
After, open microwave generator 14, produced microwave enters waveguide switch 12 by rectangular waveguide 13, and waveguide switch 12 will
Microwave is divided into two-way, and coaxial waveguide 8 of leading up to arrives microwave antenna 7 and by microwave antenna 7 to pressure break boring 2 radiation, another
Road arrives heater 16 by waveguide 15, and liquid carbon dioxide is heated to more than 34 DEG C；And then, start booster pump 17 to dioxy
Change carbon and be forced into more than 8MPa, form supercritical carbon dioxide, i.e. temperature more than 34 DEG C, the pressure state more than 8MPa, super face
Boundary's carbon dioxide enters pressure break boring 2 by pressure break pipe 9, and coal seam 1 is implemented pressure break；Meanwhile, the microwave that microwave antenna 7 gives off
To coal seam 1 and carbon dioxide continuous heating, making carbon dioxide, the most in a supercritical state (temperature more than 34 DEG C, pressure surpasses
Cross the state of 8MPa), coal seam 1 at high temperature desorbs a large amount of gas, and gas is poured in the crack that methane gas is produced by pressure break
Extraction borehole 3, now, is connected gas pumping pipe 6 with fire damp pipe network, carries out gas pumping；Remnants in pressure break boring 2
Gas enters three phase separator 19 by recovery tube 10, and the cinder in gas, water and gas are filtered out by three phase separator 19,
Remaining carbon dioxide is compressed by air compressor machine 20 and is passed through cooler 21 and cools down, and finally returns to liquid carbon dioxide storage tank 18.
Carbon dioxide owing to being partially in pressure break boring 2 can be diffused into by coalmass crevasse around holes even in lane space,
Therefore, carbon dioxide should be supplemented when described liquid carbon dioxide storage tank liquid level is less than 1/3rd height of tank.
Claims (7)
1. a microwave-assisted supercritical carbon dioxide circulation frac system, it is characterised in that: it includes and recovery tube (10) phase
The cooler that the air compressor machine (20) that three phase separator (19) even is connected with three phase separator (19) is connected with air compressor machine (20)
(21) liquid carbon dioxide storage tank (18) and with cooler (21) being connected, liquid carbon dioxide storage tank (18) downside pipeline connects
Having heaters (16), heater (16) connects through pipeline one tunnel the booster pump (17) being connected with pressure break pipe (9), and another road connects
There is the waveguide switch (12) being connected with coaxial waveguide (8), form one and realize supercritical carbon dioxide circulation pressure break, in coal seam
The loop of interior formation fracture network；Microwave antenna (7), described waveguide switch (12) warp it is connected with in described coaxial waveguide (8)
Rectangular waveguide (13) connects microwave generator (14).
2. using a microwave-assisted supercritical carbon dioxide circulation fracturing process for system described in claim 1, its feature exists
In, comprise the following steps:
A, construct pressure break boring (2) to coal seam (1) in tunnel, and take out at pressure break boring two gas of (2) both sides construction
Borehole (3), the two ends of pressure break boring (2) and mash gas pumping drilling (3) lay respectively in top board (4) and base plate (5)；
B, in mash gas pumping drilling (3) send into drainage tube (6), to pressure break boring (2) in feeding pressure break pipe (9), recovery tube
(10) hole packer (11) and be connected with the coaxial waveguide (8) of microwave antenna (7), is utilized pressure break to be holed (2) and gas pumping afterwards
Boring (3) seals；
C, being connected on waveguide switch (12) outer end of coaxial waveguide (8), waveguide switch (12) one end is through square wave
Leading (13) to be connected with microwave generator (14), waveguide switch (12) other end is connected with heater (16) by waveguide (15)
Connect；
D, being connected on booster pump (17) outer end of pressure break pipe (9), booster pump (17) is connected with heater (16) through pipeline
Connecing, heater (16) is connected with liquid carbon dioxide storage tank (18) through pipeline；
E, the outer end of recovery tube (10) being connected three phase separator (19), three phase separator (19) is connected with air compressor machine (20),
Air compressor machine (20) is connected with cooler (21), and cooler (21) is connected with liquid carbon dioxide storage tank (18)；
After f, pipeline have connected, open liquid carbon dioxide storage tank (18), make liquid carbon dioxide enter heater (16)；
G, opening microwave generator (14), the microwave of generation enters waveguide switch (12) by rectangular waveguide (13), and waveguide turns
Microwave is divided into two-way by parallel operation (12), and coaxial waveguide (8) of leading up to arrives microwave antenna (7) and by microwave antenna (7) to pressure
Splitting radiation in boring (2), waveguide (15) of separately leading up to arrives heater (16), heats liquid carbon dioxide；
H, startup booster pump (17), to the carbon dioxide pressurization after heating, form supercritical carbon dioxide, supercritical carbon dioxide
Enter in pressure break boring (2) by pressure break pipe (9), coal seam (1) is implemented pressure break；
The microwave that i, microwave antenna (7) give off, to coal seam (1) and carbon dioxide continuous heating, makes carbon dioxide be in for a long time
Supercriticality, coal seam (1) at high temperature desorbs a large amount of gas, and gas is poured into gas pumping by the crack that pressure break produces and bored
Hole (3), is connected gas pumping pipe (6) with fire damp pipe network, carries out gas pumping；
Residual gas in j, pressure break boring (2) enters three phase separator (19), three phase separator (19) by recovery tube (10)
Cinder in gas, water and gas being filtered out, remaining carbon dioxide is compressed by air compressor machine (20) and is passed through cooler
(21) cooling, finally returns to liquid carbon dioxide storage tank (18).
A kind of microwave-assisted supercritical carbon dioxide circulation fracturing process the most according to claim 2, it is characterised in that: institute
The operating frequency of the microwave generator (10) stated is 2.45 GHz, and power is 2 kW.
A kind of microwave-assisted supercritical carbon dioxide circulation fracturing process the most according to claim 2, it is characterised in that: institute
The liquid carbon dioxide heating-up temperature stated is more than 34 DEG C.
A kind of microwave-assisted supercritical carbon dioxide circulation fracturing process the most according to claim 2, it is characterised in that: institute
Stating the pressure to the carbon dioxide pressurization after heating is more than 8MPa.
A kind of microwave-assisted supercritical carbon dioxide circulation fracturing process the most according to claim 2, it is characterised in that: when
Described liquid carbon dioxide storage tank (18) liquid level should supplement carbon dioxide when being less than 1/3rd height of tank.
A kind of microwave-assisted supercritical carbon dioxide circulation fracturing process the most according to claim 2, it is characterised in that: institute
This pressure break boring (2) is 3.5-4.5m with the distance of mash gas pumping drilling (3).
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106869991A (en) * | 2017-03-06 | 2017-06-20 | 中国矿业大学 | A kind of microwave hot air couples the coal body anti-reflection method of heat injection |
| CN106894799A (en) * | 2017-04-26 | 2017-06-27 | 华北科技学院 | A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas |
| CN107120087A (en) * | 2017-04-14 | 2017-09-01 | 太原理工大学 | A kind of coal seam supercritical carbon dioxide plugging device and method |
| CN107420080A (en) * | 2017-06-27 | 2017-12-01 | 山西潞安工程有限公司 | Wear pre-draining borehole gas phase fracturing process before layer pick in a kind of hypotonic coal seam Di Chou lanes |
| CN109989783A (en) * | 2019-05-14 | 2019-07-09 | 河南理工大学 | Urgently positive/negative-pressure strong interaction combines mash gas extraction system and gas pumping method to supercritical carbon dioxide |
| CN110242256A (en) * | 2019-06-19 | 2019-09-17 | 河南理工大学 | A kind of efficient mash gas extraction device of drilling subsection |
| CN110388207A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN110388205A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating L formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN111043921A (en) * | 2019-12-19 | 2020-04-21 | 中南大学 | Microwave gain type CO2Phase-change energy-gathering blasting rock cracking system and method for blasting cracked rock |
| CN111472832A (en) * | 2020-04-09 | 2020-07-31 | 中国矿业大学 | Coal bed gas self-circulation gas injection yield increasing method |
| CN112049618A (en) * | 2020-09-11 | 2020-12-08 | 核工业北京化工冶金研究院 | Deep mineral bed supercritical carbon dioxide in-situ leaching uranium mining system and method |
| CN112360491A (en) * | 2020-11-26 | 2021-02-12 | 中铁工程装备集团有限公司 | Composite rock breaking method, cutter head and heading machine |
| CN113217009A (en) * | 2021-05-19 | 2021-08-06 | 中铁工程装备集团有限公司 | Microwave gain type CO2 phase change pressure release rock burst prevention and control method |
| CN113356825A (en) * | 2021-07-20 | 2021-09-07 | 中南大学 | Device and method for exploiting shale gas by combining microwave irradiation with dry ice fracturing |
| CN114060029A (en) * | 2021-10-19 | 2022-02-18 | 煤炭科学研究总院 | Deep coal seam permeability increasing method |
| CN115307490A (en) * | 2021-05-06 | 2022-11-08 | 西南科技大学 | Microwave radiation guide carbon dioxide blasting cracking method |
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| CN106869991A (en) * | 2017-03-06 | 2017-06-20 | 中国矿业大学 | A kind of microwave hot air couples the coal body anti-reflection method of heat injection |
| CN107120087B (en) * | 2017-04-14 | 2020-04-21 | 太原理工大学 | Coal bed supercritical carbon dioxide plugging device and method |
| CN107120087A (en) * | 2017-04-14 | 2017-09-01 | 太原理工大学 | A kind of coal seam supercritical carbon dioxide plugging device and method |
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| CN107420080A (en) * | 2017-06-27 | 2017-12-01 | 山西潞安工程有限公司 | Wear pre-draining borehole gas phase fracturing process before layer pick in a kind of hypotonic coal seam Di Chou lanes |
| CN109989783A (en) * | 2019-05-14 | 2019-07-09 | 河南理工大学 | Urgently positive/negative-pressure strong interaction combines mash gas extraction system and gas pumping method to supercritical carbon dioxide |
| CN109989783B (en) * | 2019-05-14 | 2023-08-15 | 河南理工大学 | Supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system and gas extraction method |
| CN110388207A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN110388205A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating L formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN110388207B (en) * | 2019-06-13 | 2020-11-03 | 太原理工大学 | Method for reducing composite strong mine pressure of thick hard top plate and left coal pillar by microwave heating |
| CN110242256A (en) * | 2019-06-19 | 2019-09-17 | 河南理工大学 | A kind of efficient mash gas extraction device of drilling subsection |
| CN111043921A (en) * | 2019-12-19 | 2020-04-21 | 中南大学 | Microwave gain type CO2Phase-change energy-gathering blasting rock cracking system and method for blasting cracked rock |
| CN111043921B (en) * | 2019-12-19 | 2021-05-11 | 中南大学 | Microwave gain type CO2Phase-change energy-gathering blasting rock cracking system and method for blasting cracked rock |
| CN111472832A (en) * | 2020-04-09 | 2020-07-31 | 中国矿业大学 | Coal bed gas self-circulation gas injection yield increasing method |
| CN111472832B (en) * | 2020-04-09 | 2021-01-15 | 中国矿业大学 | Coal bed gas self-circulation gas injection yield increasing method |
| CN112049618A (en) * | 2020-09-11 | 2020-12-08 | 核工业北京化工冶金研究院 | Deep mineral bed supercritical carbon dioxide in-situ leaching uranium mining system and method |
| CN112049618B (en) * | 2020-09-11 | 2024-04-09 | 核工业北京化工冶金研究院 | System and method for deep ore layer supercritical carbon dioxide on-site leaching uranium extraction |
| CN112360491B (en) * | 2020-11-26 | 2022-03-04 | 中铁工程装备集团有限公司 | Composite rock breaking method, cutter head and heading machine |
| CN112360491A (en) * | 2020-11-26 | 2021-02-12 | 中铁工程装备集团有限公司 | Composite rock breaking method, cutter head and heading machine |
| CN115307490A (en) * | 2021-05-06 | 2022-11-08 | 西南科技大学 | Microwave radiation guide carbon dioxide blasting cracking method |
| CN113217009A (en) * | 2021-05-19 | 2021-08-06 | 中铁工程装备集团有限公司 | Microwave gain type CO2 phase change pressure release rock burst prevention and control method |
| CN113217009B (en) * | 2021-05-19 | 2022-04-05 | 中铁工程装备集团有限公司 | Microwave gain type CO2 phase change pressure release rock burst prevention and control method |
| CN113356825A (en) * | 2021-07-20 | 2021-09-07 | 中南大学 | Device and method for exploiting shale gas by combining microwave irradiation with dry ice fracturing |
| CN114060029A (en) * | 2021-10-19 | 2022-02-18 | 煤炭科学研究总院 | Deep coal seam permeability increasing method |
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