CN110306963A - A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization - Google Patents
A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization Download PDFInfo
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- CN110306963A CN110306963A CN201910587975.1A CN201910587975A CN110306963A CN 110306963 A CN110306963 A CN 110306963A CN 201910587975 A CN201910587975 A CN 201910587975A CN 110306963 A CN110306963 A CN 110306963A
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- microwave
- acid solution
- pipe
- coal seam
- drilling
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- 239000002253 acid Substances 0.000 title claims abstract description 70
- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000005115 demineralization Methods 0.000 title claims abstract description 21
- 230000002328 demineralizing effect Effects 0.000 title claims abstract description 20
- 238000001028 reflection method Methods 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 230000020477 pH reduction Effects 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims abstract description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011083 cement mortar Substances 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 150000001336 alkenes Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000003667 anti-reflective effect Effects 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- 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)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization, belongs to coal mine gas extraction correlative technology field.Microwave antenna is connected to the inner terminal of coaxial waveguide and is sent into drilling by this method, is sequentially connected waveguide switch, rectangular waveguide and microwave generator in the outermost end of coaxial waveguide.Fracture network is expedited the emergence of out in coal body using microwave thermal radiation, then, acid solution is injected into drilling, acidification demineralization processing is carried out to coal seam.The contact area of acid solution and coal body has been significantly greatly increased in microwave fracturing, meanwhile, microwave heating effect enhances coal seam acidification demineralization effect.The present invention combines microwave radiation with acid solution demineralization, increases gas permeability of coal seam, so that gas pumping effect be greatly improved.
Description
Technical field
The present invention relates to a kind of coal seam anti-reflection method, especially a kind of microwave fracturing high suitable for content of mineral substances and acid
The coal seam anti-reflection method that liquid demineralization mutually cooperates with belongs to coal mine gas extraction technical field.
Background technique
Currently, high absorption, micropore, hyposmosis have become the key factor of restriction coal bed gas extraction.China coal seam
Universal poor permeability, with the increase of coal mining depth, the crack of coal body and porosity are also gradually reduced, and cause gas drainage
Inefficiency, Gas Disaster are serious.Therefore, increase coal seam hole, improve gas permeability of coal seam be improve gas drainage efficiency with watt
The fundamental way of this hazard management.Mineral grain in coal seam is easy device to hole crack and generates closure, so that coal body permeability is reduced,
Currently, domestic and foreign scholars propose to improve coal seam permeability using acid solution demineralization method, however, not due to the development of coal body initial fissure
Good, acid solution and coal body contact area are smaller, and it is limited that coal seam is acidified antireflective effect.Therefore, it needs to propose a kind of new method, improves coal
Layer acidification antireflective effect.
Summary of the invention
Technical problem: the purpose of the present invention is overcoming shortcoming present in prior art, provide a kind of method it is simple,
The microwave fracturing of coal seam antireflective effect can be greatly improved and coal seam anti-reflection method that acid solution demineralization mutually cooperates with.
Technical solution: the coal seam anti-reflection method that microwave fracturing of the invention is mutually cooperateed with acid solution demineralization is included in coal seam
It constructs one and drills, further comprising the steps of:
A, acid solution pipe, microwave pillar and gas drainage pipe are sent into drilling after the completion of construction, until acid solution pipe and watt
The front end that this drainage tube enters hole reaches roof, microwave pillar enters in the middle part of the front end arrival coal seam in hole, acid solution pipe, microwave pillar
It away from the distance in aperture is 0.1m with the exposed junction of gas drainage pipe；
B, microwave antenna is connected to coaxial waveguide front end, be then fed into the microwave pillar in drilling, until microwave day
Line reaches the front position that microwave pillar enters hole；
C, the exposed junction of coaxial waveguide is connected into waveguide switch, waveguide switch is sequentially connected rectangular waveguide and microwave hair
Raw device；
D, in acid solution pipe exposed end portion connection rubber tube, sebific duct is sequentially connected acid pump and acid solution case；
E, Grouting Pipe is placed between acid solution pipe and drilling wall surface, to acid solution pipe, microwave pillar and gas drainage in drilling
Tube inlet section interval two sides are blocked with polyurethane respectively, and the hole inner side end of block section is away from the distance of microwave pillar inner end
1.8-2.2m, the hole end face outside of block section are 0.8-1.2m away from the distance in aperture；
F, cement mortar is injected between the polyurethane of entrance two sides by Grouting Pipe；
G, after cement mortar solidifies completely, microwave generator is opened, the microwave of generation passes sequentially through rectangular waveguide, waveguide
Converter and coaxial waveguide finally reach microwave antenna, and carry out heat radiation from microwave antenna to drilling, make to expedite the emergence of out in coal body
Crack；
H, acid pump is opened, the acid solution in acid solution case is filled into drilling by sebific duct and acid solution pipe, acid solution is made to enter microwave
In the crack generated, handled 6-10 hours to carry out acidification demineralization to coal seam；
I, the remaining acid solution in drilling is discharged by gas drainage pipe, then, gas drainage pipe and fire damp is taken out
Pipe network connection is adopted, gas drainage is carried out.
The microwave pillar is the polytetrafluoroethylene (PTFE) material that can be transmitted microwave but also protect microwave antenna and coaxial waveguide
Matter.
The acid solution is hydrochloric acid, oxalic acid or sulfate liquid, concentration 10-15%.
The utility model has the advantages that minerals in coal plugging hole crack, facilitates dredging hole crack using acid solution demineralization, to reach coal seam
Antireflective effect, however, acid solution is difficult to migrate in fine and close coal body, acid solution and coal body due to coal body initial fissure depauperation
Contact area is smaller, and it is limited that coal seam is acidified antireflective effect.Therefore, present invention employs microwave fracturing methods to produce in coal seam first
Raw fracture network, meanwhile, acidification demineralization processing is carried out to coal seam, allows acid solution to enter deep layer coal body by fracture network, to increase
The contact area for having added acid solution and coal, enhances antireflective effect.The present invention combines microwave radiation with acid solution demineralization, not only increases
Big gas permeability of coal seam, and gas pumping effect is greatly improved, method is easy to operate, and effect is good, leads in this technology
There is wide applicability in domain.
Detailed description of the invention
Fig. 1 is the coal seam anti-reflection method schematic diagram that a kind of microwave fracturing of the invention is mutually cooperateed with acid solution demineralization.
In figure: the coal seam 1-, 2- drilling, 3- acid solution pipe, 4- gas drainage pipe, 5- microwave antenna, 6- coaxial waveguide, 7- microwave
Pillar, 8- waveguide switch, 9- rectangular waveguide, 10- microwave generator, 11- polyurethane, 12- Grouting Pipe, 13- cement mortar,
14- sebific duct, 15- acid pump, 16- acid solution case.
Specific embodiment
One embodiment of the present of invention is further described with reference to the accompanying drawing:
The coal seam anti-reflection method that a kind of microwave fracturing of the invention is mutually cooperateed with acid solution demineralization, the specific steps are as follows: firstly,
It constructs in coal seam 1 drilling 2, acid solution pipe 3, microwave pillar 7 and gas drainage pipe is sent into the drilling 2 after the completion of construction
4, until the front end that front end arrival 1 top plate of coal seam, microwave pillar 7 that acid solution pipe 3 and gas drainage pipe 4 enter hole enter hole reaches coal seam
1 middle part, the exposed junction of acid solution pipe 3, microwave pillar 7 and gas drainage pipe 4 are 0.1m away from the distance in aperture；Microwave pillar therein
7 be that can transmit microwave but also protect the polytetrafluoroethylene (PTFE) material of microwave antenna 5 and coaxial waveguide 6.Then, by microwave antenna 5
It is connected to 6 front end of coaxial waveguide, is sent into the microwave pillar 7 in drilling 2, until microwave antenna 5 reaches microwave pillar 7 and enters hole
Front position；The exposed junction of coaxial waveguide 6 is connected into waveguide switch 8, waveguide switch 8 is sequentially connected rectangular waveguide 9 and micro-
Wave producer 10；Meanwhile in 3 exposed end portion connection rubber tube 14 of acid solution pipe, sebific duct 14 is sequentially connected acid pump 15 and acid solution case 16.
After piping connection is good, implement sealing of hole operation, i.e., Grouting Pipe 12 is placed between 2 wall surfaces of acid solution pipe 3 and drilling, in drilling 2
Acid solution pipe 3, microwave pillar 7 and 4 entrance interval two sides of gas drainage pipe are blocked with polyurethane 11 respectively, the hole of block section
Distance of the inner side end away from 7 inner end of microwave pillar is 1.8-2.2m, and the hole end face outside of block section is 0.8- away from the distance in aperture
1.2m；Then, by Grouting Pipe 12 between entrance two sides polyurethane 11 inject cement mortar 13.It is complete to cement mortar 13
After solidification, microwave generator 10 is opened, the microwave of generation passes sequentially through rectangular waveguide 9, waveguide switch 8 and coaxial waveguide 6, most
Microwave antenna 5 is reached afterwards, and carries out heat radiation from microwave antenna 5 to drilling 2, makes to expedite the emergence of out crack in coal body.Meanwhile opening acid
Acid solution in acid solution case 16 is filled drilling 2 by sebific duct 14 and acid solution pipe 3, acid solution is made to enter what microwave had generated by liquid pump 15
In crack, handled 6-10 hours to carry out acidification demineralization to coal seam 1, the acid solution is hydrochloric acid, oxalic acid or sulfuric acid liquid
Body, concentration 10-15%.By gas drainage pipe 4 by drill 2 in remaining acid solution be discharged, later, by gas drainage pipe 4 with
The connection of underground gas extraction pipe network, carries out gas drainage.
Claims (3)
1. the coal seam anti-reflection method that a kind of microwave fracturing is mutually cooperateed with acid solution demineralization is included in one drilling of construction in coal seam (1)
(2), which is characterized in that further comprising the steps of:
A, acid solution pipe (3), microwave pillar (7) and gas drainage pipe (4) are sent into drilling after the completion of construction (2), until acid
The front end that front end arrival coal seam (1) top plate, the microwave pillar (7) that liquid pipe (3) and gas drainage pipe (4) enter hole enter hole reaches coal seam
(1) middle part, distance of the exposed junction away from aperture of acid solution pipe (3), microwave pillar (7) and gas drainage pipe (4) are 0.1m；
B, microwave antenna (5) is connected to coaxial waveguide (6) front end, be then fed into the microwave pillar (7) in drilling (2) Nei, directly
The front position that microwave pillar (7) enter hole is reached to microwave antenna (5)；
C, the exposed junction of coaxial waveguide (6) is connected into waveguide switch (8), waveguide switch (8) is sequentially connected rectangular waveguide (9)
With microwave generator (10)；
D, in acid solution pipe (3) exposed end portion connection rubber tube (14), sebific duct (14) is sequentially connected acid pump (15) and acid solution case (16)；
E, Grouting Pipe (12) are placed between acid solution pipe (3) and drilling (2) wall surface, the interior acid solution pipe of drilling (2) (3), microwave is protected
Pipe (7) and gas drainage pipe (4) entrance interval two sides are blocked with polyurethane (11) respectively, the hole inner side end of block section
Distance away from microwave pillar (7) inner end is 1.8-2.2m, and the hole end face outside of block section is 0.8-1.2m away from the distance in aperture；
F, cement mortar (13) are injected between entrance two sides polyurethane (11) by Grouting Pipe (12)；
G, it after cement mortar (13) completely solidification, opens microwave generator (10), the microwave of generation passes sequentially through rectangular waveguide
(9), waveguide switch (8) and coaxial waveguide (6), finally reach microwave antenna (5), and from microwave antenna (5) to drilling (2) into
Row heat radiation makes to expedite the emergence of out crack in coal body；
H, acid pump (15) are opened, the acid solution in acid solution case (16) are filled into drilling (2) by sebific duct (14) and acid solution pipe (3),
Enter acid solution in the crack that microwave has generated, is handled 6-10 hours to carry out acidification demineralization to coal seam (1)；
I, by gas drainage pipe (4) by the remaining acid solution discharge in drilling (2), then, by gas drainage pipe (4) and underground watt
The connection of this extraction pipe network, carries out gas drainage.
2. the coal seam anti-reflection method that a kind of microwave fracturing according to claim 1 is mutually cooperateed with acid solution demineralization, feature exist
In: the microwave pillar (7) is the polytetrafluoroethyl-ne that can be transmitted microwave but also protect microwave antenna (5) and coaxial waveguide (6)
Alkene material.
3. the coal seam anti-reflection method that a kind of microwave fracturing according to claim 1 is mutually cooperateed with acid solution demineralization, feature exist
In: the acid solution is hydrochloric acid, oxalic acid or sulfate liquid, concentration 10-15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910587975.1A CN110306963A (en) | 2019-07-02 | 2019-07-02 | A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910587975.1A CN110306963A (en) | 2019-07-02 | 2019-07-02 | A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization |
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| CN110306963A true CN110306963A (en) | 2019-10-08 |
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| CN201910587975.1A Pending CN110306963A (en) | 2019-07-02 | 2019-07-02 | A kind of coal seam anti-reflection method that microwave fracturing is mutually cooperateed with acid solution demineralization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352280A (en) * | 2022-01-27 | 2022-04-15 | 辽宁工程技术大学 | Method for improving coal cutting efficiency of hard coal seam based on combination of microwave radiation and liquid injection |
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| CN106368733A (en) * | 2016-10-21 | 2017-02-01 | 山东科技大学 | Gas-bearing coal mass hydrofracture and acidification combined strengthening anti-reflection assessment method |
| CN108708765A (en) * | 2018-04-13 | 2018-10-26 | 山东科技大学 | One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance |
| CN109736765A (en) * | 2019-01-15 | 2019-05-10 | 辽宁大学 | A kind of exploitation fluid injection of coal seam hydraulic slotted liner technique is combined with extraction integration prevention and treatment composite power disaster method and matching used wetting agent |
-
2019
- 2019-07-02 CN CN201910587975.1A patent/CN110306963A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015073790A1 (en) * | 2013-11-15 | 2015-05-21 | Delphi Technologies, Inc. | Heater with a fuel cell stack assembly and a combustor and method of operating |
| CN105484720A (en) * | 2015-12-29 | 2016-04-13 | 中国矿业大学 | Microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method |
| CN106368733A (en) * | 2016-10-21 | 2017-02-01 | 山东科技大学 | Gas-bearing coal mass hydrofracture and acidification combined strengthening anti-reflection assessment method |
| CN108708765A (en) * | 2018-04-13 | 2018-10-26 | 山东科技大学 | One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance |
| CN109736765A (en) * | 2019-01-15 | 2019-05-10 | 辽宁大学 | A kind of exploitation fluid injection of coal seam hydraulic slotted liner technique is combined with extraction integration prevention and treatment composite power disaster method and matching used wetting agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114352280A (en) * | 2022-01-27 | 2022-04-15 | 辽宁工程技术大学 | Method for improving coal cutting efficiency of hard coal seam based on combination of microwave radiation and liquid injection |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191008 |
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