CN105484720B - The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing - Google Patents
The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing Download PDFInfo
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- CN105484720B CN105484720B CN201511019052.4A CN201511019052A CN105484720B CN 105484720 B CN105484720 B CN 105484720B CN 201511019052 A CN201511019052 A CN 201511019052A CN 105484720 B CN105484720 B CN 105484720B
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- 239000003245 coal Substances 0.000 title claims abstract description 49
- 238000000874 microwave-assisted extraction Methods 0.000 title claims abstract description 13
- 238000001028 reflection method Methods 0.000 title claims abstract description 13
- 238000005086 pumping Methods 0.000 claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003960 organic solvent Substances 0.000 claims abstract description 13
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims description 14
- 229920001971 elastomer Polymers 0.000 claims description 12
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000000638 solvent extraction Methods 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000023753 dehiscence Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing, belongs to underground coal mine hydraulic fracturing correlative technology field.Microwave antenna is connected to the inner terminal of coaxial waveguide and sends into fracturing borehole by this method, connects waveguide converter in the outermost end of coaxial waveguide, waveguide converter is connected with rectangular waveguide, and rectangular waveguide is connected with microwave generator.Organic solvent and water under high pressure are mixed into merga pass pressure break pipe hydraulic fracturing is implemented to drilling, simultaneously, open microwave generator, radiated and drilled by microwave antenna, pressure break provides seepage channel for solvent, organic molecule in organic solvent dissolving coal is so as to produce reaming effect, and the fuel factor of microwave promotes desorption of mash gas.Hydraulic fracturing, solvent extraction are combined by the present invention with microwave radiation, are substantially increased coal seam porosity, permeability, are promoted desorption of mash gas, so that gas pumping effect is greatly improved.
Description
Technical field
The present invention relates to the coal seam anti-reflection method that a kind of On Microwave-assisted Extraction and hydraulic fracturing are mutually cooperateed with, belong to underground coal mine
Hydraulic fracturing correlative technology field, be particularly suitable for use in soft high gas layer.
Background technology
The high methane of China's coal-mine 70% or so is projecting coal bed the characteristics of have micropore, hyposmosis, high adsorption, causes
Most of coal bed gas extraction is difficult, and Gas Disaster is serious.Hydraulic fracturing is the effective technology for improving coal bed gas extraction effect
One of measure, but existing hydraulic fracturing technology effect is unstable, the phenomenon such as insufficient that there is release.Having under microwave radiation technology
Machine solvent extraction can dissolve the organic micromolecule compound in coal, dredge the porous dehiscence gap of coal body, greatly improve the hole of coal body
Rate and permeability, meanwhile, microwave radiation can effectively facilitate desorption of mash gas, and the thermal stress of generation is even more that can tear coal body, production
Raw micro-crack.However, this technology is because organic solvent is difficult to penetrate into coal body and can not be in colliery scene popularization and application.Cause
This, needs a kind of new technique of research badly, organic solvent extracting can be combined with hydraulic fracturing, reach quick fracturing, expansion
Hole, the effect for promoting desorption.
The content of the invention
Technical problem：The purpose of the present invention be overcome weak point present in prior art there is provided a kind of method it is simple,
The coal seam anti-reflection method that the On Microwave-assisted Extraction and hydraulic fracturing that hydraulic fracturing efficiency can be greatly improved mutually are cooperateed with.
Technical scheme：The coal seam anti-reflection method that the On Microwave-assisted Extraction of the present invention is mutually cooperateed with hydraulic fracturing, is included in coal
One hydraulic fracturing drilling of construction, further comprising the steps of in layer：
Feeding pressure break pipe, microwave pillar and gas pumping pipe in a, the hydraulic fracturing drilling after the completion of construction, until pressure
The front end for splitting pipe and gas pumping pipe is reached in the middle part of the inner terminal arrival coal seam of roof, microwave pillar, the exposed junction of three pipes
Distance away from aperture is 0.1m；
B, microwave antenna is connected to coaxial waveguide front end, be then fed into the microwave pillar in drilling, until microwave
Antenna reaches the inner of microwave pillar；
C, the exposed junction connection waveguide converter by coaxial waveguide, waveguide converter are sequentially connected rectangular waveguide
And microwave generator；
D, pressure break pipe outer end connect high-pressure rubber pipe, high-pressure rubber pipe be sequentially connected high-pressure hydraulic pump, blending bin, solvent tank and
Water tank；
E, between pressure break pipe and hydraulic fracturing drilling wall place Grouting Pipe, hydraulic fracturing is drilled in pressure break pipe, micro-
Ripple pillar and gas pumping pipe both sides are blocked with polyurethane respectively, the closure end face on the inside of hole away from microwave pillar it is inner away from
From for 2m, distance of the closure end face away from aperture on the outside of hole is 1m；
F, cement mortar between polyurethane at two injected by Grouting Pipe；
G, after after slurries completely solidification, open high-pressure hydraulic pump, make organic solvent in the water and solvent tank in water tank mixed
Uniformly mixed in mould assembling, mixing liquid implements hydraulic fracturing by high-pressure rubber pipe and pressure break pipe to coal seam；
While h, hydraulic fracturing, microwave generator is opened, the microwave of generation passes sequentially through rectangular waveguide, waveguide and turned
Parallel operation and coaxial waveguide, finally reach microwave antenna, and radiated from microwave antenna to hydraulic fracturing drilling；
I, when hydraulic fracturing equipment pressure gauge show pressure substantially rise when, by gas pumping pipe and fire damp pipe network
Connection, carries out gas pumping.
Described microwave pillar is polytetrafluoroethylene (PTFE) material, and can transmit microwave can protect microwave antenna and coaxial waveguide again
Pipe.
The working frequency of described microwave generator is 2.45GHz, and power is 2kW.
Described organic solvent is tetrahydrofuran.
Beneficial effect：The present invention can produce a large amount of cracks by hydraulic fracturing in coal body, uniformly be mixed in water under high pressure
Organic solvent (tetrahydrofuran) is closed, solvent can be penetrated into coalmass crevasse, so as to considerably increase the contact surface of solvent and coal body
Product；Under the auxiliary of microwave, organic solvent can dissolve the organic micromolecule compound in coal, dredge the porous dehiscence gap of coal；Meanwhile,
The fuel factor that microwave radiation is produced can promote coal-bed gas to desorb, and the thermal stress of generation can more tear coal body, produce fine fisssure
Line；Hydraulic fracturing, solvent extraction are combined by the present invention with microwave radiation, substantially increase coal seam porosity, permeability, are promoted
Desorption of mash gas, so that gas pumping effect is greatly improved, in the art with wide applicability.
Brief description of the drawings
Fig. 1 is the coal seam anti-reflection method schematic diagram that a kind of On Microwave-assisted Extraction of the invention is mutually cooperateed with hydraulic fracturing.
In figure：1- coal seams, 2- hydraulic fracturings drilling, 3- pressure break pipes, 4- gas pumping pipes, 5- microwave antennas, 6- on-axis waves
Conduit, 7- microwave pillars, 8- waveguide converters, 9- rectangular waveguides, 10- microwave generators, 11- polyurethane, 12- slip castings
Pipe, 13- cement mortar, 14- high-pressure rubber pipes, 15- high-pressure hydraulic pumps, 16- blending bins, 17- solvent tanks, 18- water tanks.
Embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
The coal seam anti-reflection method that the On Microwave-assisted Extraction of the present invention is mutually cooperateed with hydraulic fracturing：Comprise the following steps that：
Feeding pressure in a, a hydraulic fracturing drilling 2 of being constructed in coal seam 1, the hydraulic fracturing drilling 2 after the completion of construction
Pipe 3, microwave pillar 7 and gas pumping pipe 4 are split, until the front end of pressure break pipe 3 and gas pumping pipe 4 reaches the top plate of coal seam 1, microwave
The inner terminal of pillar 7 reaches the middle part of coal seam 1, and distance of the exposed junction away from aperture of three pipes is 0.1m；
B, microwave antenna 5 is connected to the front end of coaxial waveguide 6, be then fed into the microwave pillar 7 in drilling, until micro-
Wave antenna 5 reaches the inner of microwave pillar 7；
C, the exposed junction connection waveguide converter 8 by coaxial waveguide 6, waveguide converter 8 is sequentially connected square wave
Conduit 9 and microwave generator 10；
D, in the outer end of pressure break pipe 3 high-pressure rubber pipe 14 is connected, high-pressure rubber pipe 14 is sequentially connected high-pressure hydraulic pump 15, blending bin
16th, solvent tank 17 and water tank 18；
E, the placement Grouting Pipe 12 between pressure break pipe 3 and hydraulic fracturing drill 2 walls, to pressure break in hydraulic fracturing drilling 2
Pipe 3, microwave pillar 7 and the both sides of gas pumping pipe 4 are blocked with polyurethane 11 respectively, and the closure end face on the inside of hole is protected away from microwave
The inner distance of pipe 7 is that distance of the closure end face away from aperture on the outside of 2m, hole is 1m；
F, pass through between polyurethane 11 at Grouting Pipe 12 to two inject cement mortar 13；
G, after after slurries completely solidification, open high-pressure hydraulic pump 15, make water in water tank 18 with it is organic molten in solvent tank 17
Agent is uniformly mixed in blending bin 16, and mixing liquid implements hydraulic fracturing by high-pressure rubber pipe 14 and pressure break pipe 3 to coal seam 1；Institute
The organic solvent stated is tetrahydrofuran.
While h, hydraulic fracturing, microwave generator 10 is opened, the microwave of generation passes sequentially through rectangular waveguide 9, waveguide
Pipe converter 8 and coaxial waveguide 6, finally reach microwave antenna 5, and carry out spoke from microwave antenna 5 to hydraulic fracturing drilling 2
Penetrate；The working frequency of described microwave generator 10 is 2.45GHz, and power is 2kW.
I, when hydraulic fracturing equipment pressure gauge show pressure substantially rise when, by gas pumping pipe 4 and fire damp pipe
Net connection, carries out gas pumping.
Described microwave pillar 7 is polytetrafluoroethylene (PTFE) material, and can transmit microwave can protect microwave antenna 5 and on-axis wave again
Conduit 6.
Embodiment 1, as shown in figure 1, the coal seam anti-reflection method that On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing：First, exist
Feeding pressure break pipes 3, microwave are protected in one hydraulic fracturing drilling 2 of construction in coal seam 1, the hydraulic fracturing drilling 2 after the completion of construction
Pipe 7 and gas pumping pipe 4 until the inner terminal of pressure break pipe 3 and gas pumping pipe 4 reaches the top plate of coal seam 1, microwave pillar 7 it is most interior
End reaches the middle part of coal seam 1, and the exposed junction of three pipes is at the 0.1m positions of aperture, and microwave pillar 7 therein is polytetrafluoroethylene (PTFE) material
Matter.Then, the outer end of microwave antenna 5 is connected into coaxial waveguide 6 and sent into microwave antenna 5 and coaxial waveguide 6 together micro-
In ripple pillar 7, until microwave antenna 5 reaches the inner terminal of microwave pillar 7；The outer end of coaxial waveguide 6 is connected into waveguide
Converter 8, waveguide converter 8 is connected with rectangular waveguide 9, and rectangular waveguide 9 is connected with microwave generator 10, wherein, it is micro-
The working frequency of wave producer 10 is 2.45GHz, and power is 2kW.Meanwhile, high-pressure rubber pipe 14 is connected in the outer end of pressure break pipe 3, it is high
Moulding pipe 14 is connected with high-pressure hydraulic pump 15, and high-pressure hydraulic pump 15 is connected with blending bin 16, and blending bin 16 is connected with solvent tank 17, solvent
Case 17 is connected with water tank 18.After pipeline is connected, implement sealing of hole operation, i.e., pressure break pipe 3 and hydraulic fracturing drilling 2 walls it
Between place Grouting Pipe 12, to hydraulic fracturing drilling 2 in pressure break pipe 3, microwave pillar 7 and the both sides of gas pumping pipe 4 use poly- ammonia respectively
Ester 11 is blocked, and the closure end face on the inside of hole is closure end face on the outside of 2m, hole away from aperture away from the inner distance of microwave pillar 7
Distance be 1m；Then, by injecting cement mortar 13 between polyurethane 11 at Grouting Pipe 12 to two.Treat that slurries solidify completely
Afterwards, high-pressure hydraulic pump 15 is opened, makes the water in water tank 18 with the organic solvent (tetrahydrofuran) in solvent tank 17 in blending bin 16
Uniform mixing, mixing liquid implements hydraulic fracturing by high-pressure rubber pipe 14 and pressure break pipe 3 to coal seam 1；While hydraulic fracturing,
Microwave generator 10 is opened, the microwave of generation passes sequentially through rectangular waveguide 9, waveguide converter 8 and coaxial waveguide 6, most
Microwave antenna 5 is reached afterwards and is radiated from microwave antenna 5 to hydraulic fracturing drilling 2, in the presence of microwave radiation, in water under high pressure
Organic solvent penetrates into pressure break crack, is fully contacted with coal body and dissolves the organic micromolecule compound in coal.When hydraulic fracturing is set
When standby pressure gauge shows that pressure substantially rises, gas pumping pipe 4 is connected with fire damp pipe network, gas pumping is carried out.
Claims (4)
1. the coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing, is included in coal seam（1）Middle construction one
Hydraulic fracturing drills（2）, it is characterised in that it is further comprising the steps of：
A, the hydraulic fracturing drilling after the completion of construction（2）Interior feeding pressure break pipe（3）, microwave pillar（7）With gas pumping pipe
（4）, until pressure break pipe（3）With gas pumping pipe（4）Front end reach coal seam（1）Top plate, microwave pillar（7）Inner terminal reach
Coal seam（1）Middle part, distance of the exposed junction away from aperture of three pipes is 0.1m；
B, by microwave antenna（5）It is connected to coaxial waveguide（6）Front end, is then fed into the microwave pillar in drilling（7）It is interior, until
Microwave antenna（5）Reach microwave pillar（7）The inner；
C, by coaxial waveguide（6）Exposed junction connection waveguide converter（8）, waveguide converter（8）It is sequentially connected rectangle
Waveguide（9）And microwave generator（10）；
D, in pressure break pipe（3）Outer end connects high-pressure rubber pipe（14）, high-pressure rubber pipe（14）It is sequentially connected high-pressure hydraulic pump（15）, mixing
Case（16）, solvent tank（17）And water tank（18）；
E, in pressure break pipe（3）Drilled with hydraulic fracturing（2）Grouting Pipe is placed between wall（12）, hydraulic fracturing is drilled（2）It is interior
Pressure break pipe（3）, microwave pillar（7）With gas pumping pipe（4）Polyurethane is used respectively in both sides（11）Blocked, the closure on the inside of hole
End face is away from microwave pillar（7）Inner distance is that distance of the closure end face away from aperture on the outside of 2m, hole is 1m；
F, pass through Grouting Pipe（12）Polyurethane to two（11）Between inject cement mortar（13）；
G, after slurries completely solidification after, open high-pressure hydraulic pump（15）, make water tank（18）In water and solvent tank（17）In it is organic
Solvent is in blending bin（16）In uniformly mix, mixing liquid passes through high-pressure rubber pipe（14）With pressure break pipe（3）To coal seam（1）Implement water
Force and split；
While h, hydraulic fracturing, microwave generator is opened（10）, the microwave of generation passes sequentially through rectangular waveguide（9）, waveguide
Pipe converter（8）And coaxial waveguide（6）, finally reach microwave antenna（5）, and by microwave antenna（5）Drilled to hydraulic fracturing
（2）Radiated；
I, when hydraulic fracturing equipment pressure gauge show pressure substantially rise when, by gas pumping pipe（4）With fire damp pipe network
Connection, carries out gas pumping.
2. the coal seam anti-reflection method that a kind of On Microwave-assisted Extraction according to claim 1 is mutually cooperateed with hydraulic fracturing, it is special
Levy and be：Described microwave pillar（7）For polytetrafluoroethylene (PTFE) material, can transmit microwave can protect microwave antenna again（5）With it is same
Axle waveguide（6）.
3. the coal seam anti-reflection method that a kind of On Microwave-assisted Extraction according to claim 1 is mutually cooperateed with hydraulic fracturing, it is special
Levy and be：Described microwave generator（10）Working frequency be 2.45 GHz, power be 2 kW.
4. the coal seam anti-reflection method that a kind of On Microwave-assisted Extraction according to claim 1 is mutually cooperateed with hydraulic fracturing, it is special
Levy and be：Described organic solvent is tetrahydrofuran.
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| CN201511019052.4A CN105484720B (en) | 2015-12-29 | 2015-12-29 | The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing |
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| CN201511019052.4A CN105484720B (en) | 2015-12-29 | 2015-12-29 | The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing |
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| CN105484720B true CN105484720B (en) | 2017-10-24 |
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