CN106869897A - Coal bed underground loosens method and device - Google Patents
Coal bed underground loosens method and device Download PDFInfo
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- CN106869897A CN106869897A CN201710160200.7A CN201710160200A CN106869897A CN 106869897 A CN106869897 A CN 106869897A CN 201710160200 A CN201710160200 A CN 201710160200A CN 106869897 A CN106869897 A CN 106869897A
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- 239000003245 coal Substances 0.000 title claims abstract description 248
- 238000000034 method Methods 0.000 title claims abstract description 73
- 239000007788 liquid Substances 0.000 claims abstract description 126
- 239000002360 explosive Substances 0.000 claims abstract description 110
- 230000037452 priming Effects 0.000 claims abstract description 92
- 238000005553 drilling Methods 0.000 claims abstract description 68
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000002309 gasification Methods 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 3
- 235000011613 Pinus brutia Nutrition 0.000 claims description 3
- 241000018646 Pinus brutia Species 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 15
- 238000011084 recovery Methods 0.000 abstract description 11
- 230000008595 infiltration Effects 0.000 abstract description 10
- 238000001764 infiltration Methods 0.000 abstract description 10
- 238000013467 fragmentation Methods 0.000 abstract description 4
- 238000006062 fragmentation reaction Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 3
- 239000011800 void material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
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- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- LVEGNRYEXNXVGQ-UHFFFAOYSA-N chloric acid;potassium Chemical compound [K].OCl(=O)=O LVEGNRYEXNXVGQ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
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- -1 nitroparaffin hydrocarbon Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000009715 pressure infiltration Methods 0.000 description 1
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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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
-
- 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
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Method and device is loosened the invention provides a kind of coal bed underground.Wherein, the method comprises the following steps：Drill process, drilling is drilled with ground to coal seam to be loosened；Supplying step, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into；Step is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.The coal bed underground that the present invention is provided loosens method and liquid explosives and priming is pressed into the natural void and crack in coal seam to be loosened, and liquid explosives and priming is constantly permeated along hole, the crack in coal seam to be loosened and is extended.Ignite liquid explosives again afterwards, the liquid explosives in hole and crack is exploded and produce shock wave, then coal seam fragmentation is made, Fracture Networks are expanded and extended, so as to form certain fracture network in coal seam, the gas permeability in coal seam is substantially increased, infiltration type underground gasification process is formed, so as to improve the stability and coal seam recovery ratio of coal layer underground gasifying process.
Description
Technical field
The present invention relates to coal and Coal-seam Gas Recovery Technologies field, method is loosened in particular to a kind of coal bed underground
And device.
Background technology
Preservation underground coal seam by underground water institute saturation, and influenceed by ground pressure, hole, space, crack are typically in closure
State, thus the natural gas permeability in coal seam is typically poor, can be considered water barrier.Gas permeability of coal seam is by covered depth and degree of metamorphism
Influence, the general deeper gas permeability of buried depth is poorer, and equally, degree of metamorphism more highly-breathable is also poorer.Gasification technology is used under coal
Thermochemical method, is fuel gas by the direct in situ conversion of subterranean coal, realizes the chemistry exploitation of coal, the key of the technology
It is that, using the gas permeability in coal seam itself, by the gasifying agent containing oxygen, in feeding coal seam, oxygen is by modes such as diffusion, convection current
Permeated with coal seam, contacted, reacted, infiltration type gasification reaction is to maintain the key point that gasification stabilization is carried out.
But coal seam is because of the difference of itself natural endowment, for rotten bituminous coal high, anthracite and deep fractures, due to coal seam
Natural poor air permeability, gasifying agent is big with coal seam contact mass transfer resistance, and coal seam easily forms wall surface type reaction, often as wall is burnt
Change, ashing and gasification reaction is further deteriorated, stability is poor, coal seam recovery ratio is low in turn result in gasification.
The content of the invention
In consideration of it, the present invention proposes a kind of coal bed underground loosens method and device, it is intended to solve the poor air permeability in coal seam
Caused coal seam gasification stability difference and the low problem of coal seam recovery ratio.
On one side, the present invention proposes a kind of coal bed underground loosening method.The method comprises the following steps：Drilling step
Suddenly, it is drilled with drilling in ground to coal seam to be loosened；Supplying step, liquid explosives and priming is passed through in drilling and press-in is treated
Loosen coal seam；Step is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
Further, in above-mentioned coal bed underground loosening method, in drill process, it is upright opening or inclined hole to drill, drilling
Orientation is along the main fissure direction in coal seam to be loosened or biggest principal stress direction；Or drilling is directional hole or horizontal well, the orientation of drilling
Along the vertical main fissure direction in coal seam to be loosened or vertical biggest principal stress direction.
Further, in above-mentioned coal bed underground loosening method, also include between drill process and supplying step：Segmentation step
Suddenly, coal seam to be loosened is divided into multiple coal seam section to be loosened.
Further, in above-mentioned coal bed underground loosening method, in supplying step, from the coal seam to be loosened positioned at drilling bottom
Section starts, successively to respectively coal seam section conveying priming and liquid explosives to be loosened；In loosening step, by respectively coal seam section to be loosened
Priming and liquid explosives ignite successively, respectively coal seam section to be loosened is loosened successively.
Further, above-mentioned coal bed underground loosens method, also includes between drill process and supplying step：Priming steps,
To with the spaced pre-manufactured hole of drilling in inject water, coal seam to be loosened is placed in and drills and pre-manufactured hole between.
Further, above-mentioned coal bed underground loosens method, also includes between supplying step and loosening step：Note displacement fluid step
Suddenly, to injecting displacement fluid in pre-manufactured hole.
Further, above-mentioned coal bed underground loosens method, also includes after loosening step：Gasification step, gasifying agent is defeated
Coal seam to be loosened is delivered to, and treats loosening coal seam and gasified.
The present invention uses liquid explosives and priming, and liquid explosives and priming are pressed into the natural hole in coal seam to be loosened
In gap and crack, liquid explosives and priming can be in hole, cracks constantly along coal seam to be loosened under the ordering about of pressure
Infiltration and extension.Ignite liquid explosives again afterwards, the liquid explosives in hole and crack is exploded and produces shock wave, then
Make coal seam fragmentation, hole and crack are expanded and extended, so as to form certain fracture network in coal seam to be loosened, significantly
The gas permeability in coal seam to be loosened is improve, infiltration type underground gasification process is formed, so as to improve coal layer underground gasifying to be loosened
The stability and coal seam recovery ratio of process.Additionally, liquid explosives directly act on coal seam to be loosened, it is to avoid to drilling middle sleeve
Damage；Coal seam need not manually be loosened, the coal layer loosening method that the present embodiment is provided is whole terrestrial operations, it is to avoid safety
Hidden danger.
On the one hand, the invention allows for a kind of coal bed underground loosening device.The device includes：Liquid feed device and continuous
Pipe；Wherein, liquid feed device is used to provide liquid explosives and priming；Connecting pipes are interior in drilling is arranged in, and the first of continuous pipe
End is connected with liquid feed device, and the second end of continuous pipe corresponds to coal seam to be loosened setting, connecting pipes in by liquid explosives with
Priming is delivered to coal seam to be loosened.
Further, in above-mentioned coal bed underground loosening device, liquid feed device includes：Delivery pump and fluid reservoir；Wherein, convey
The outlet of pump is connected with the first end of continuous pipe, and the entrance of delivery pump is connected with fluid reservoir.
Further, above-mentioned coal bed underground loosening device, also includes：The appendix of one end open, igniter and hydrojet
Device；Wherein, the openend of appendix is connected with the second end of continuous pipe, and igniter and liquid-jet device may be contained within gas transmission
Pipe, liquid-jet device be used for coal seam to be loosened convey liquid explosives and priming, igniter be used for ignite liquid explosives and
Quick-fried medicine.
Further, above-mentioned coal bed underground loosening device, also includes：First packer, the second packer；Wherein, first
Packer and the second packer may be contained within appendix, also, igniter and liquid-jet device may be contained within the first packer and
Between second packer.
Further, above-mentioned coal bed underground loosening device, also includes：Sensor, controller and alarm；Wherein, sense
Device is arranged at appendix, also, sensor is arranged at the top of the first packer, and sensor is used to obtain igniter in drilling
In depth value；Controller is electrically connected with sensor, the depth value for receiving sensor acquisition, and in depth value more than default
Drive signal is sent during value；Alarm is electrically connected with the controller, for receiving drive signal and sending alarm signal.
Further, in above-mentioned coal bed underground loosening device, liquid-jet device is spray gun.
Further, above-mentioned coal bed underground loosening device, also includes：Guide；Wherein, guide is arranged at gas transmission
The closed end of pipe.
The present invention is injected in coal seam to be loosened liquid explosives and priming by ground by continuous pipe, is drilled without pollution
In sleeve pipe, while reduce liquid explosives wall built-up loss.Liquid feed device can continue to provide liquid explosives and priming, with
Make liquid explosives and priming constantly along the hole in coal seam to be loosened, crack infiltration and extension, be conducive to coal seam to be loosened
Loosen, improve the gas permeability in coal seam, and then improve the gasification stability and coal seam recovery ratio in coal seam.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the flow chart that coal bed underground provided in an embodiment of the present invention loosens method；
Fig. 2 be coal bed underground loosening method provided in an embodiment of the present invention in, drill during for upright opening or inclined hole, drilling
Orientation schematic diagram；
Fig. 3 drills in coal bed underground loosening method provided in an embodiment of the present invention, to drill during for directional hole or horizontal well
Orientation schematic diagram；
Fig. 4 drills in coal bed underground loosening method provided in an embodiment of the present invention, to drill during for directional hole or horizontal well
Orientation top view；
Fig. 5 is the another flow chart that coal bed underground provided in an embodiment of the present invention loosens method；
Fig. 6 is the another flow chart that coal bed underground provided in an embodiment of the present invention loosens method；
Fig. 7 is the another flow chart that coal bed underground provided in an embodiment of the present invention loosens method；
Fig. 8 is the another flow chart that coal bed underground provided in an embodiment of the present invention loosens method；
Fig. 9 is the structural representation of coal bed underground loosening device provided in an embodiment of the present invention.
Specific embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.Conversely, there is provided these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment of the method：
Referring to Fig. 1, the flow chart of the coal bed underground loosening method that Fig. 1 is provided for the present embodiment.As illustrated, the method bag
Include following steps：
Drill process S1, drilling is drilled with ground to coal seam to be loosened.
Specifically, intending carrying out in underground coal gasification(UCG) region, drilling 13 is being drilled with to coal seam to be loosened 15 from ground, drilling
13 bottom is located in coal seam to be loosened 15.During specific implementation, a drilling 13 is at least drilled with.Preferably, two and two are drilled with
Drilling 13 more than individual.During specific implementation, drilling 13 can be upright opening or inclined hole, or directional hole or horizontal well.When
When drilling 13 is upright opening or inclined hole, at 50 meters, pre-manufactured hole 14, the bottom of pre-manufactured hole 14 can be in advance drilled with drilling 1
Portion can be in coal seam same layer position with the bottom of drilling 13；When drill 13 be directional hole or horizontal well when, can with brill
At 200 meters of 13 distance of hole, pre-manufactured hole 14 is drilled with advance, the nearly horizontal segment of drilling 13 is located in coal seam to be loosened 15 and and pre-manufactured hole
14 bottom is connected.
Supplying step S2, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into.
Specifically, after by liquid explosives and priming pressurization, it is pressed into or clamp-ons in the crack in coal seam to be loosened 15, high pressure liquid
Body explosive flows in the primary pore in coal seam to be loosened 15, crack, makes to be connected between each hole, each crack, so that
Further extend in coal seam to be loosened 15, extend.During specific implementation, liquid explosives can be nitroglycerine base liquid explosives, water
Base thickening liquefaction explosive, nitroparaffin hydrocarbon based liquids explosive etc..Priming is main by oxidant, fuel agent and other auxiliary materials
Composition, oxidant can be potassium chlorate, potassium hyperchlorate etc., and fuel agent can be magnesium powder etc., and other auxiliary materials can be nitric acid
Ammonium, aluminium powder etc..Liquid explosives and priming first after the mixture of ground, then can inject coal seam to be loosened after press device supercharging
In 15；Liquid explosives can also be first injected, priming is reinjected.
Step S3 is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
Specifically, first priming is ignited, the priming for having ignited again ignites liquid explosives, and then makes coal seam to be loosened
15 Fracture Networks 16 for forming high osmosis.During specific implementation, the mode of igniting of priming can hit for electric ignition detonation, machinery
Hit detonation, temperature-sensitive detonation, remote initiation etc..The specific priming mode of igniting can determine according to actual needs, this implementation
Example does not do any restriction to it.Additionally, when wait loosen coal seam 15 by explosion formed fracture network 11 after, can to drilling 13 in open
Begin press-in pressure-air, and pressure-air can be discharged from pre-manufactured hole 14, and then take the priming and liquid explosives of residual out of, together
When, prevented also from the closure of fracture network 11.
Compared with solid explosive is used in the prior art, in the present embodiment, using liquid explosives and priming, and by liquid
Explosive and priming are pressed into the natural void and crack in coal seam to be loosened 15, and liquid explosives and priming are under the ordering about of pressure
Can constantly infiltration and extension along hole, the crack in coal seam 15 to be loosened.Ignite liquid explosives again afterwards, makes hole and splits
Liquid explosives in gap explode and produce shock wave, then make coal seam fragmentation, and hole and crack are expanded and extended, so that
Certain fracture network 11 is formed in coal seam to be loosened 15, the gas permeability in coal seam to be loosened 15 is substantially increased, infiltration is formed
Formula underground gasification process, so as to improve the stability and coal seam recovery ratio of the underground gasification process of coal seam to be loosened 15.Additionally, liquid
Body explosive directly acts on coal seam to be loosened 15, it is to avoid the damage to 13 middle sleeves 17 of drilling；Coal seam need not be manually loosened,
The coal layer loosening method that the present embodiment is provided is whole terrestrial operations, it is to avoid potential safety hazard.
Referring to Fig. 2 to Fig. 4, in drill process S1, when drilling 13 for upright opening or inclined hole, the orientation of drilling 13 can edge
The main fissure direction X in coal seam to be loosened 15 or biggest principal stress direction.When drilling 13 is directional hole or horizontal well, the nearly water of drilling 13
The orientation of flat section can be along the main fissure direction X or vertical biggest principal stress directions in vertical coal seam to be loosened 15.And then beneficial to liquid
Along the extension in crack, the effect of explosion can be strengthened, further improve the rate of extraction in gasification coal seam.
Referring to Fig. 5, the another flow chart of the coal bed underground loosening method that Fig. 5 is provided for the present embodiment.As illustrated, the party
Method comprises the following steps：
Drill process S1, drilling is drilled with ground to coal seam to be loosened.
Division step S4, multiple coal seam section to be loosened is divided into by coal seam to be loosened.
Specifically, when drilling 13 for upright opening or inclined hole, coal seam to be loosened 15 can be divided into multiple coal to be loosened
Interval, for example, be divided into A, B, C, D, E totally 5 coal seam sections to be loosened by coal seam to be loosened 15.When drilling 13 is directional hole or water
During horizontal well, the nearly horizontal segment coal seam of directional hole or horizontal well can be divided into multiple coal seam section to be loosened, such as by directional hole
Or the nearly horizontal segment coal seam of horizontal well is divided into totally 5 sections of A, B, C, D, E, every section of coal seam segment length to be loosened can be 30 meters~50
Rice.
Supplying step S2, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into.
Step S3 is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
It should be noted that the specific implementation process of drill process S1, supplying step S2 and loosening step S3 is referring to above-mentioned
Embodiment, the present embodiment will not be repeated here.
In the present embodiment, by coal seam to be loosened, 15 points is multistage, and respectively coal seam section to be loosened is loosened successively, can be made
The bigger Fracture Networks 16 of the forming range of coal seam to be loosened 15, make the gas permeability in coal seam to be loosened 15 obtain further carrying
Height, and then improve the gasification stability in coal seam to be loosened 15 and the rate of extraction in coal seam to be loosened 15.
In above-described embodiment, in supplying step S2, since the coal seam section to be loosened positioned at drilling bottom, successively to respectively treating
Loosen coal seam section conveying priming and liquid explosives.
S3 in step is loosened, the priming and liquid explosives in respectively coal seam section to be loosened is ignited successively, successively to respectively treating
Coal seam section is loosened to be loosened.
During specific implementation, priming and liquid explosives first can be conveyed to coal seam section A to be loosened, then will coal seam section be loosened
Priming and liquid explosives in A ignite successively, so treat loosening coal seam section A loosened.Then repeat above-mentioned conveying, draw
The step of combustion priming and liquid explosives, treat loosening coal seam section B, coal seam section C to be loosened, coal seam section D to be loosened and wait to loosen
Coal seam section E is loosened successively.Make can to improve to the full extent in this way the gas permeability in coal seam to be loosened 15, Jin Erti
The gasification stability in coal seam to be loosened 15 high and the rate of extraction in coal seam to be loosened 15.
Referring to Fig. 6, the another flow chart of the coal bed underground loosening method that Fig. 6 is provided for the present embodiment.As illustrated, the party
Method comprises the following steps：
Drill process S1, drilling is drilled with ground to coal seam to be loosened.
Division step S4, multiple coal seam section to be loosened is divided into by coal seam to be loosened.
Priming steps S5, to the spaced pre-manufactured hole of drilling in inject water, coal seam to be loosened be placed in drilling with it is prefabricated
Between hole.
Specifically, in order to prevent liquid explosives and priming from entering in pre-manufactured hole 14, can be to injecting one in pre-manufactured hole 14
Quantitative water, it is to avoid during implementation bursting work, problem that pre-manufactured hole 14 is damaged.
Supplying step S2, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into.
Step S3 is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
Wherein priming steps S5 and division step S4 does not have sequencing.
It should be noted that the specific implementation of drill process S1, division step S4, supplying step S2 and loosening step S3
Journey will not be repeated here referring to above-described embodiment, the present embodiment.
In the present embodiment, before conveying liquid explosives and priming, can be with to a certain amount of water is injected in pre-manufactured hole 14
Prevent liquid explosives and priming from entering in pre-manufactured hole 14, and then avoid after liquid explosives ignite, pre-manufactured hole 14 is destroyed
Problem.
Referring to Fig. 7, the another flow chart of the coal bed underground loosening method that Fig. 7 is provided for the present embodiment.As illustrated, the party
Method comprises the following steps：
Drill process S1, drilling is drilled with ground to coal seam to be loosened.
Division step S4, multiple coal seam section to be loosened is divided into by coal seam to be loosened.
Priming steps S5, to the spaced pre-manufactured hole of drilling in inject water, coal seam to be loosened be placed in drilling with it is prefabricated
Between hole.
Supplying step S2, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into.
Note displacement fluid step S6, to injecting displacement fluid in pre-manufactured hole.
Specifically, during conveying liquid explosives and priming in drilling 13, if it is observed that in pre-manufactured hole 14
Liquid level there is change after, it is possible to the implant operation of stop liquid explosive and priming, and certain to being injected in pre-manufactured hole 14
The displacement fluid of amount, during the liquid explosives and priming in pre-manufactured hole 14 are headed into coal seam to be loosened 15.Then pumped into according to oil pipe
Liquid explosives and priming number, estimate the amount of the liquid explosives and priming in coal seam to be loosened 15, until drilling 13 with
After liquid level equilibrium in pre-manufactured hole 14, priming and liquid explosives are ignited successively.
Step S3 is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
It should be noted that drill process S1, division step S4, priming steps S5, supplying step S2 and loosening step S3
Specific implementation process referring to above-described embodiment, the present embodiment will not be repeated here.
In the present embodiment, to a certain amount of displacement fluid is injected in pre-manufactured hole 14, can be by the liquid explosives in pre-manufactured hole 14
In coal seam to be loosened 15 being headed into priming, it is therefore prevented that to the damage of pre-manufactured hole 14 after liquid explosives explode, serve protection
The effect of pre-manufactured hole 14.
Referring to Fig. 8, the another flow chart of the coal bed underground loosening method that Fig. 8 is provided for the present embodiment.As illustrated, the party
Method comprises the following steps：
Drill process S1, drilling is drilled with ground to coal seam to be loosened.
Division step S4, multiple coal seam section to be loosened is divided into by coal seam to be loosened.
Priming steps S5, to the spaced pre-manufactured hole of drilling in inject water, coal seam to be loosened be placed in drilling with it is prefabricated
Between hole.
Supplying step S2, liquid explosives and priming are passed through in drilling and coal seam to be loosened is pressed into.
Note displacement fluid step S6, to injecting displacement fluid in pre-manufactured hole.
Step S3 is loosened, priming and liquid explosives are ignited successively, treated loosening coal seam and loosened.
Gasification step S7, is delivered to gasifying agent coal seam to be loosened, and treats loosening coal seam and gasified.
Specifically, gasifying agent can be oxygenous agent, and oxygen concentration can be 0~100%.It is oxygen-containing during specific implementation
Gasifying agent and oxygen-containing gasifying agent and the preparation of combustion adjuvant and hybrid mode can be ground hybrid mode, or mix underground
Conjunction mode.Specific preparation can according to actual needs determine that the present embodiment does not do any restriction to it with hybrid mode.Contain
The conveying of oxygen agent can be delivered to flame range by annulus type conveyance conduit by ground, it is also possible to directly by sleeve pipe 17 by ground
Face is delivered to flame range.Specific mode of movement can according to actual needs determine that the present embodiment does not do any restriction to it.
Compared with prior art, in the present embodiment, the coal seam with large area Fracture Networks 16 is gasified, was gasified
Cheng Gengjia stabilizations, coal seam recovery ratio is higher.
To sum up, the present embodiment uses liquid explosives and priming, and liquid explosives and priming are pressed into coal seam to be loosened
Natural void and crack in, liquid explosives and priming can constantly along the hole in coal seam to be loosened under the ordering about of pressure
Permeated in gap, crack and extended.Ignite liquid explosives again afterwards, the liquid explosives in hole and crack is exploded and produces punching
Ripple is hit, then makes coal seam fragmentation, hole and crack are expanded and extended, so as to form certain crack in coal seam to be loosened
Network, substantially increases the gas permeability in coal seam to be loosened, and infiltration type underground gasification process is formed, so as to improve coal seam to be loosened
The stability and coal seam recovery ratio of underground gasification process.Additionally, liquid explosives directly act on coal seam to be loosened, it is to avoid to boring
The damage of hole middle sleeve；Coal seam need not be manually loosened, the coal layer loosening method that the present embodiment is provided is whole terrestrial operations, is kept away
Potential safety hazard is exempted from.
Device embodiment：
Referring to Fig. 9, the preferred structure of the coal bed underground loosening device that the present embodiment is provided is shown in figure.As illustrated,
The device includes：Liquid feed device 1 and continuous pipe 2.
Wherein, liquid feed device 1 is used to provide liquid explosives and priming.Continuous pipe 2 is arranged in drilling 13, also, even
The first end (upper end shown in Fig. 9) of continuous pipe 2 is connected with liquid feed device 1, during specific implementation, can be provided with continuous pipe 2
Control valve 10, the conveying of liquid explosives and priming can be controlled by controlling valve 10.Second end of continuous pipe 2 is (shown in Fig. 9
Lower end) set corresponding to coal seam to be loosened 15, continuous pipe 2 is used to for liquid explosives and priming to be delivered to coal seam to be loosened 15
In crack.During specific implementation, liquid explosives can be nitroglycerine base liquid explosives, water base thickening liquefaction explosive, nitroparaffins
Base liquid explosives etc..Priming is mainly made up of oxidant, fuel agent and other auxiliary materials, and oxidant can be chloric acid
Potassium, potassium hyperchlorate etc., fuel agent can be magnesium powder etc., and other auxiliary materials can be ammonium nitrate, aluminium powder etc..Liquid explosives and rise
Quick-fried medicine can first after the mixture of ground, in reinjecting coal seam to be loosened 15；Liquid explosives can also be first injected, detonation is reinjected
Medicine.
In the present embodiment, liquid explosives and priming are injected in coal seam to be loosened 15 by ground by continuous pipe 2, without
Sleeve pipe 17 in pollution drilling 13, while reducing the wall built-up loss of liquid explosives.Liquid feed device 1 can continue offer liquid and fry
Medicine and priming, so that liquid explosives and priming constantly along the hole in coal seam 15 to be loosened, crack infiltration and extend, favorably
In the loosening in coal seam to be loosened 15, the gas permeability in coal seam is improve, and then improve gasification stability and the coal seam go back in coal seam
Adopt rate.
In above-described embodiment, liquid feed device 1 can include：Delivery pump 11 and fluid reservoir 12.Wherein, the outlet of delivery pump 11
Can be connected with the first end of continuous pipe 2, the entrance of delivery pump 11 can be connected with fluid reservoir 12.During specific implementation, liquid
The preparation of body explosive each component can be carried out in fluid reservoir 12, and the mixing and preparation of liquid explosives and priming can also be in storages
To be carried out in flow container 12.
In the present embodiment, fluid reservoir 12 can treat loosening coal seam 15 and persistently provide liquid explosives and priming, Ke Yiyong
In the mixing and preparation of liquid explosives and priming.Liquid explosives and priming can be pressed into coal seam to be loosened 15 by delivery pump 11
Crack in, be conducive to liquid explosives and priming in crack constantly permeate and extend.
In the various embodiments described above, can also include：The appendix 3 of one end open, igniter 4 and liquid-jet device 5.Its
In, the openend of appendix 3 can be connected with the second end of continuous pipe 2 by connector 11, during specific implementation, appendix 3
Can directly machining be formed from steel.Igniter 4 and liquid-jet device 5 can be arranged on appendix 3, hydrojet dress
Putting 5 can be delivered in the crack in coal seam to be loosened 15 liquid explosives and priming, and igniter 4 can be by coal seam to be loosened
Liquid explosives and priming in 15 cracks ignite, and then coal seam to be loosened 15 is produced Fracture Networks 16.During specific implementation, point
Fiery device 4 can be arranged at the top (top shown in Fig. 9) of liquid-jet device 5.Liquid-jet device 5 can be spray gun, certainly, specifically
During implementation, multiple through holes can be opened up on appendix 3 to replace liquid-jet device 5 to be delivered to liquid explosives and priming and treats pine
In the crack in dynamic coal seam 15.
In the present embodiment, liquid-jet device 5 can make the injection pressure of liquid explosives and priming bigger, and then advantageously
In the infiltration and extension of liquid explosives and priming in the crack in coal seam to be loosened 15.
In the various embodiments described above, can also include：First packer 6 and the second packer 7.Wherein, the He of the first packer 6
Second packer 7 can be arranged on appendix 3, also, igniter 4 and liquid-jet device 5 may be contained within the first packer 6
And second between packer 7.First packer 6 and the second packer 7 can be opened under fluid pressure, the inwall with drilling 13
Laminating, forms sealing.
In the present embodiment, coal seam to be loosened 15 can be divided into multistage by the first packer 6 and the second packer 7, and be divided
Do not carry out operation, also, the pressure of liquid explosives that the first packer 6 and the second packer 7 can spray liquid-jet device 5 is straight
Connect and be applied on coal seam to be loosened 15, and ensure the not pressure-bearing of the sleeve pipe 17 in drilling 13, be conducive to protection drilling 13.Additionally, making
After industry terminates, the first packer 6 and the second packer 7 can unload recovery, it is to avoid unnecessary waste.
In the various embodiments described above, can also include：Sensor 8, controller (not shown) and alarm (do not show in figure
Go out).Wherein, sensor 8 can be placed on appendix 3 and be arranged at the top (top shown in Fig. 9) of the first packer 6, pass
Sensor 8 can obtain depth value of the igniter 4 in drilling 13.During specific implementation, sensor 8 can connect for wireless sleeve pipe 17
Hoop locator, can be mechanical coupler collar locator specifically.Controller can be electrically connected with sensor 8, and controller can be with
The depth value that sensor 8 is obtained is received, and drive signal is sent when depth value is more than preset value.Alarm can be with controller
Electrical connection, alarm can receive drive signal and send alarm signal.
It should be noted that the preset value of depth value can according to actual needs determine that the present embodiment is not appointed to it
What is limited.
In the present embodiment, can realize transferring igniter 4 prison of depth using sensor 8, controller and alarm
Control, overcomes the prebuckling of continuous pipe 2, by the error in dipping caused by outer force deformation and counting error, corrects igniter 4
Decentralization depth, and by alarm signal in time stop decentralization, accurately located construction layer position so that operation more facilitate,
It is reliable.
In the various embodiments described above, can also include：Guide 9.Wherein, guide 9 can be arranged at appendix 3
Closed end, touched with the closed end for preventing appendix 3 scrape or plug-in-sleeve 17 inwall.
It should be noted that coal bed underground loosening method is identical with coal bed underground loosening device principle in the present invention, it is related
Part can be with cross-referenced.
To sum up, the present embodiment is injected in coal seam to be loosened liquid explosives and priming by ground by continuous pipe, without
Sleeve pipe in pollution drilling, while reducing the wall built-up loss of liquid explosives.Liquid feed device can continue provide liquid explosives and
Priming, so that liquid explosives and priming constantly along the hole in coal seam to be loosened, crack infiltration and extend, is conducive to treating pine
The loosening in dynamic coal seam, improves the gas permeability in coal seam, and then improve the gasification stability and coal seam recovery ratio in coal seam.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (14)
1. a kind of coal bed underground loosens method, it is characterised in that comprise the following steps：
Drill process, drilling is drilled with ground to coal seam to be loosened；
Supplying step, liquid explosives and priming are passed through in the drilling and the coal seam to be loosened is pressed into；
Step is loosened, the priming and the liquid explosives are ignited successively, the coal seam to be loosened is loosened.
2. coal bed underground according to claim 1 loosens method, it is characterised in that in the drill process,
The drilling is upright opening or inclined hole, and the orientation of the drilling is answered along the main fissure direction in coal seam to be loosened or maximum are main
Force direction；Or
Described drilling is directional hole or horizontal well, and the orientation of the drilling is along the vertical main fissure direction in coal seam to be loosened or vertical
The straight biggest principal stress direction.
3. coal bed underground according to claim 1 loosens method, it is characterised in that in the drill process and the conveying
Also include between step：
Division step, multiple coal seam section to be loosened is divided into by the coal seam to be loosened.
4. coal bed underground according to claim 3 loosens method, it is characterised in that
In the supplying step, since positioned at the coal seam section to be loosened described in the drilling bottom, described pine is treated to each successively
Dynamic coal seam section the conveying priming and the liquid explosives；
In the loosening step, the priming and the liquid explosives in respectively coal seam section to be loosened are ignited successively, successively
Each coal seam section to be loosened is loosened.
5. coal bed underground according to claim 1 loosens method, it is characterised in that the drill process and the conveying are walked
Also include between rapid：
Priming steps, to the spaced pre-manufactured hole of the drilling in inject water, the coal seam to be loosened is placed in the drilling
And the pre-manufactured hole between.
6. coal bed underground according to claim 1 loosens method, it is characterised in that the supplying step and the loosening are walked
Also include between rapid：
Note displacement fluid step, to injecting displacement fluid in the pre-manufactured hole.
7. coal bed underground according to claim 1 loosens method, it is characterised in that also include after the loosening step：
Gasification step, is delivered to the coal seam to be loosened, and the coal seam to be loosened is gasified by gasifying agent.
8. a kind of coal bed underground loosening device, it is characterised in that including：Liquid feed device (1) and continuous pipe (2)；Wherein,
The liquid feed device (1) is for providing liquid explosives and priming；
For being arranged in drilling, the first end of the continuous pipe (2) is connected the continuous pipe (2) with the liquid feed device (1)
Logical, the second end of the continuous pipe (2) corresponds to coal seam to be loosened setting, and the continuous pipe (2) is for by the liquid explosives
The coal seam to be loosened is delivered to the priming.
9. coal bed underground loosening device according to claim 8, it is characterised in that the liquid feed device (1) includes：Conveying
Pump (11) and fluid reservoir (12)；Wherein,
The outlet of the delivery pump (11) is connected with the first end of the continuous pipe (2), the entrance of the delivery pump (11) with
The fluid reservoir (12) is connected.
10. coal bed underground loosening device according to claim 8, it is characterised in that also include：The appendix of one end open
(3), igniter (4) and liquid-jet device (5)；Wherein,
The openend of the appendix (3) is connected with the second end of the continuous pipe (2), the igniter (4) and described
Liquid-jet device (5) may be contained within the appendix (3), and the liquid-jet device (5) is for described to the coal seam conveying to be loosened
Liquid explosives and the priming, the igniter (4) is for the liquid explosives and the priming of igniting.
11. coal bed underground loosening devices according to claim 10, it is characterised in that also include：First packer (6),
Second packer (7)；Wherein,
First packer (6) and second packer (7) may be contained within the appendix (3), also, the igniting dress
Put (4) and the liquid-jet device (5) may be contained between first packer (6) and second packer (7).
12. coal bed underground loosening devices according to claim 11, it is characterised in that also include：Sensor (8), control
Device and alarm；Wherein,
The sensor (8) is arranged at the appendix (3), also, the sensor (8) is arranged at first packer
(6) top, the sensor (8) is for obtaining depth value of the igniter (4) in the drilling；
The controller is electrically connected with the sensor (8), the depth value for receiving the sensor (8) acquisition, and in institute
Drive signal is sent when stating depth value more than preset value；
The alarm is electrically connected with the controller, for receiving the drive signal and sending alarm signal.
13. coal bed underground loosening devices according to claim 10, it is characterised in that
The liquid-jet device (5) is spray gun.
The 14. coal bed underground loosening device according to any one of claim 8 to 13, it is characterised in that also include：Guiding
Device (9)；Wherein,
The guide (9) is arranged at the closed end of the appendix (3).
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Cited By (1)
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| CN112096358A (en) * | 2020-09-25 | 2020-12-18 | 山东科技大学 | Underground coal gasification mining method for drilling blasting cracking loose coal bed |
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