CN105298462A - High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway - Google Patents
High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway Download PDFInfo
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- CN105298462A CN105298462A CN201510753829.3A CN201510753829A CN105298462A CN 105298462 A CN105298462 A CN 105298462A CN 201510753829 A CN201510753829 A CN 201510753829A CN 105298462 A CN105298462 A CN 105298462A
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- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title abstract description 9
- 230000035699 permeability Effects 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 8
- 238000005474 detonation Methods 0.000 claims description 7
- 238000001028 reflection method Methods 0.000 claims description 7
- 230000035939 shock Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000005684 electric field Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 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
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- 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)
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a high-power electric knocking assisted hydrofracture coal seam permeability increase method for an end-located drainage roadway and is applicable to efficient drainage of gas in a high-gas low-permeability coal seam. According to the method, firstly, a drilling machine is used for drilling hydrofracture discharge holes in the coal seam from the end-located drainage roadway; secondly, the hydrofracture technology is used for forming fractures in the hydrofracture discharge holes; thirdly, impulse waves generated by a high-voltage electric pulse discharger which discharges electricity in water are used for acting on media, a large quantity of fractures are generated, and secondary expansion and communication of original fractures are accelerated; meanwhile, the fractures in the coal seam develop constantly to form a fracture network under the synergistic effect of pressure constantly increasing in the hydrofracture process and repeated impact of the impulse waves on the media, and a good channel is provided for transportation of the gas; as a result, the permeability of the coal seam is remarkably enhanced, and efficient drainage of the gas is achieved.
Description
Technical field
The present invention relates to high power electric detonation shake auxiliary fracturing coal seam, a kind of Di Chou lane anti-reflection method, be particularly useful for the improvement of underground coal mine high methane hypotonicity subterranean zone gas.
Background technology
China Mine Geological complicated condition, and major part is high methane, low air permeability coal seam, commonsense method mash gas extraction difficulty is comparatively large, and in recovery process, gas emission is large, Gas Outburst and gas explosion explosion hazard increasingly serious.Therefore, to coal seam implement artificial fracturing anti-reflection, improve gas extraction concentration and extraction efficiency, be the important means effectively preventing coal mine gas disaster, ensure Safety of Coal Mine Production.
At present, be that the waterpower measure of representative is more and more used in the work of China's coal-mine regional gas control with fracturing, also achieve certain effect.But due to underground coal mine complex geologic conditions, the crack quantity that single fracturing measure is formed in coal seam is few, and release antireflective effect is limited, and extraction efficiency is not high, is difficult to meet the normal mining requirement in colliery.
Summary of the invention
Technical problem: the present invention seeks to the deficiency for existence of the prior art, high power electric detonation shake auxiliary fracturing coal seam, the Di Chou lane anti-reflection method providing a kind of method simple, easy to operate, effective.
Technical scheme: Di Chou lane of the present invention high power electric detonation shake auxiliary fracturing coal seam anti-reflection method, comprises the steps:
A, pressure break electric discharge boring of constructing to direction, coal seam in Di Chou lane, until pressure break electric discharge boring is crept into through roof 0.5m place's stopping;
B, adopt front end that the pressure break steel pipe of high pressure pulse discharge device is installed, from pressure break electric discharge boring, deliver to the centre position in coal seam, in the rear end of pressure break steel pipe apart from pressure break electric discharge 2 ~ 3m place of drilling orifice place installation hole packer; High-pressure rubber pipe is connected in the rear end of pressure break steel pipe;
C, the high voltage cable connecting high pressure pulse discharge device to be connected with the flame-proof switch one end in Di Chou lane, the flame-proof switch other end is connected on high-voltage pulse power source, by high-pressure rubber pipe, pressure break steel pipe is connected with the high-pressure hydraulic pump in Di Chou lane, described high-pressure rubber pipe is equipped with pressure meter and valve;
D, open valve, by high-pressure hydraulic pump to water filling in pressure break electric discharge boring, when the pressure meter registration on high-pressure rubber pipe reaches 5Mpa, stop injecting water, valve-off in pressure break electric discharge boring;
E, open flame-proof switch, by high-voltage pulse power source to the charging of high pressure pulse discharge device, make high pressure pulse discharge device at discharge in water, the shock wave of formation is in coal body, produce new crack and make original crack propagation, discharging after 50 ~ 90 times and disconnect flame-proof switch;
F, again open high-pressure hydraulic pump, continue water filling to pressure break electric discharge boring, make pressure continue to increase, when pressure meter registration increases 5Mpa, stop to pressure break electric discharge pouring water into borehole;
G, repetition step e and f many times, make pressure constantly increase, until when registration reaches 50Mpa, stops water filling, open valve, by release in pressure break discharge aperture; Pressure break steel pipe, high pressure pulse discharge device and hole packer are exited pressure break electric discharge boring, boring of then pressure break being discharged is connected to gas pumping pipe network mash gas extraction.
The discharge voltage of described high pressure pulse discharge device is 20-150KV, and discharge frequency is 5-60Hz.
Beneficial effect: the present invention is by getting up hydraulic fracturing technology and high electric field pulse combine with technique, utilize the sphere shock wave that high electric field pulse discharger produces at discharge in water, powerful shock wave is formed in water, a large amount of cracks is formed in coal seam, and initial fissure is expanded, thus effectively increase the crack quantity in coal seam, extend the length of pre-existing fracture, increase gas permeability of coal seam, effectively improve gas pumping efficiency.After acting on the crack that fracturing produces, the secondary in crack can be promoted to expand and through, and add the crack quantity in coal seam.By the synergy of fracturing and high electric field pulse, the crack in coal seam is constantly grown and is formed Fracture Networks, and the migration for gas provides good passage, and the gas permeability in coal seam significantly strengthens, thus achieves the efficient extraction of gas.Its method is simple, practical, has a good application prospect to the regional gas control of high methane, low air permeability coal seam.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention method schematic diagram;
In figure: 1-Di Chou lane, 2-coal seam, 3-top board, 4-pressure break electric discharge boring, 5-pressure break steel pipe, 6-high pressure pulse discharge device, 7-hole packer, 8-high voltage cable, 9-flame-proof switch, 10-high-voltage pulse power source, 11-high-pressure rubber pipe, 12-pressure meter, 13-high-pressure hydraulic pump, 14-valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, Di Chou lane of the present invention high power electric detonation shake auxiliary fracturing coal seam anti-reflection method, it is as follows that tool stops step:
A, pressure break electric discharge boring 4 of constructing to direction, coal seam 2 in Di Chou lane 1, until pressure break electric discharge boring 4 is crept into apart from the stopping of 0.5m place through coal seam 2 top board 3;
B, in the front end of pressure break steel pipe 5, a high pressure pulse discharge device 6 is installed, then the centre position in coal seam 2 delivered to by the pressure break steel pipe 5 front end being provided with high pressure pulse discharge device 6 from pressure break electric discharge boring 4, installs hole packer 7 in the rear end of pressure break steel pipe 5 apart from pressure break electric discharge 2 ~ 3m place of boring 4 aperture place; High-pressure rubber pipe 11 is connected in the rear end of pressure break steel pipe 5;
C, the high voltage cable 8 connecting high pressure pulse discharge device 6 to be connected with flame-proof switch 9 one end in Di Chou lane 1, flame-proof switch 9 other end is connected on high-voltage pulse power source 10, by high-pressure rubber pipe 11, pressure break steel pipe 5 is connected with the high-pressure hydraulic pump 13 in Di Chou lane 1, described high-pressure rubber pipe 11 is equipped with pressure meter 12 and valve 14;
D, open valve 14, by high-pressure hydraulic pump 13 to water filling in pressure break electric discharge boring 4, when pressure meter 12 registration on high-pressure rubber pipe 11 reaches 5Mpa, stop injecting water in pressure break electric discharge boring 4, valve-off 14, water under high pressure acts on coal body, makes coal body produce a large amount of crack;
E, open flame-proof switch 9, charged to high pressure pulse discharge device 6 by high-voltage pulse power source 10, make high pressure pulse discharge device 6 at discharge in water, according to on-site actual situations setting discharge voltage, discharge voltage is 20-150KV, discharge frequency is 5-60Hz, High Voltage electric field passes through liquid, because huge energy abrupt release is in discharge channel, liquid rapid vaporization in passage, expansion produce powerful shock wave in coal body, produce new crack and make original crack propagation, discharging and disconnect flame-proof switch 9 afterwards 50 ~ 90 times;
F, again unlatching high-pressure hydraulic pump 13, continue water filling to pressure break electric discharge boring 4, make pressure continue to increase on the basis of original pressure, when pressure meter 12 registration increases 5Mpa, stops to pressure break electric discharge boring 4 water filling;
G, repetition step e and f many times, make water injection pressure constantly increase, until when pressure meter registration reaches 50Mpa, stops water filling, open valve 14, to pressure break discharge aperture 4 release; After release, pressure break steel pipe 5, high pressure pulse discharge device 6 and hole packer 7 are exited pressure break electric discharge boring 4, boring 4 of then pressure break being discharged is connected to gas pumping pipe network and carries out mash gas extraction.
Claims (2)
1. high power electric detonation shake auxiliary fracturing coal seam, a Zhong Dichou lane anti-reflection method, is characterized in that comprising the steps:
A, pressure break electric discharge boring (4) of constructing to coal seam (2) direction in Di Chou lane (1), until pressure break electric discharge boring (4) is crept into through coal seam (2) top board (3) 0.5m place stopping;
B, adopt front end that the pressure break steel pipe (5) of high pressure pulse discharge device (6) is installed, from pressure break electric discharge boring (4), deliver to the centre position of coal seam (2), apart from pressure break electric discharge boring 2 ~ 3m place of (4) aperture place, hole packer (7) is installed in the rear end of pressure break steel pipe (5); High-pressure rubber pipe (11) is connected in the rear end of pressure break steel pipe (5);
C, to be connected connecting the high voltage cable (8) of high pressure pulse discharge device (6) with flame-proof switch (9) one end in Di Chou lane (1), flame-proof switch (9) other end is connected on high-voltage pulse power source (10), by high-pressure rubber pipe (11), pressure break steel pipe (5) is connected with the high-pressure hydraulic pump (13) in Di Chou lane (1), described high-pressure rubber pipe (11) is equipped with pressure meter (12) and valve (14);
D, open valve (14), by high-pressure hydraulic pump (13) to pressure break electric discharge boring (4) interior water filling, when pressure meter (12) registration on high-pressure rubber pipe (11) reaches 5Mpa, stop injection water in pressure break electric discharge boring (4), valve-off (14);
E, open flame-proof switch (9), charged to high pressure pulse discharge device (6) by high-voltage pulse power source (10), make high pressure pulse discharge device (6) at discharge in water, the shock wave formed is in coal body, produce new crack and make original crack propagation, discharging after 50 ~ 90 times and disconnect flame-proof switch (9);
F, again open high-pressure hydraulic pump (13), continue water filling to pressure break electric discharge boring (4), make pressure continue to increase, when pressure meter (12) registration increases 5Mpa, stop to pressure break electric discharge boring (4) water filling;
G, repetition step e and f many times, make pressure constantly increase, until when registration reaches 50Mpa, stops water filling, open valve (14), by pressure break discharge aperture (4) interior release; Pressure break steel pipe (5), high pressure pulse discharge device (6) and hole packer (7) are exited pressure break electric discharge boring (4), then pressure break electric discharge boring (4) is connected to gas pumping pipe network mash gas extraction.
2. a kind of Di Chou lane according to claim 1 high power electric detonation shake auxiliary fracturing coal seam anti-reflection method, is characterized in that: the discharge voltage of described high pressure pulse discharge device (6) is 20-150KV, and discharge frequency is 5-60Hz.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753829.3A CN105298462A (en) | 2015-11-06 | 2015-11-06 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
| PCT/CN2016/077970 WO2017075935A1 (en) | 2015-11-06 | 2016-03-31 | Method of increasing permeability of coal seam using high-power electric blasting assisted by hydraulic fracturing from bottom drainage roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753829.3A CN105298462A (en) | 2015-11-06 | 2015-11-06 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
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| CN105298462A true CN105298462A (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510753829.3A Pending CN105298462A (en) | 2015-11-06 | 2015-11-06 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
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| WO (1) | WO2017075935A1 (en) |
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| CN105673067A (en) * | 2016-03-07 | 2016-06-15 | 中国矿业大学 | Hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method |
| CN106523023A (en) * | 2016-12-28 | 2017-03-22 | 中国矿业大学 | Pulse hydraulic fracturing device and method based on continuous rotary valve |
| WO2017075935A1 (en) * | 2015-11-06 | 2017-05-11 | 中国矿业大学 | Method of increasing permeability of coal seam using high-power electric blasting assisted by hydraulic fracturing from bottom drainage roadway |
| CN106761646A (en) * | 2016-12-30 | 2017-05-31 | 北京百恒达石油技术有限公司 | Shock wave makes seam apparatus and system |
| CN108343378A (en) * | 2018-01-29 | 2018-07-31 | 中国矿业大学 | A kind of coal seam rapid drilling method of electric pulse auxiliary machinery drilling |
| CN108397182A (en) * | 2018-04-27 | 2018-08-14 | 河南理工大学 | Electric pulse cooperates with the device and method in the anti-reflection coal seam of frozen-thawed |
| CN109083624A (en) * | 2018-07-04 | 2018-12-25 | 华中科技大学 | A kind of the reservoir properties remodeling method and device of composite pulse shock wave and hydraulic fracturing |
| CN109162755A (en) * | 2018-09-11 | 2019-01-08 | 中国矿业大学 | A kind of coal uncovering method that electric pulse is combined with grouting and reinforcing |
| WO2019075885A1 (en) * | 2017-10-18 | 2019-04-25 | 西安交通大学 | Method of reforming coal-bed gas well employing controllable shock waves in combination with surge water injection pressurization |
| CN109838221A (en) * | 2017-11-28 | 2019-06-04 | 中国石油化工股份有限公司 | A kind of overstocked cracking method of deep layer shale gas high energy arc complex |
| CN110513066A (en) * | 2019-08-30 | 2019-11-29 | 西安闪光能源科技有限公司 | Coal bed gas straight well method for increasing |
| CN110578549A (en) * | 2019-07-23 | 2019-12-17 | 华北科技学院 | Electric explosion and seismic fracturing cooperated microwave heat drive gas extraction system and method |
| CN111237013A (en) * | 2020-03-13 | 2020-06-05 | 神华神东煤炭集团有限责任公司 | Drainage method and device |
| CN112392540A (en) * | 2020-11-19 | 2021-02-23 | 中国矿业大学 | Microwave-assisted pre-splitting and high-voltage pulse synergistic coal seam weakening and permeability increasing device and method |
| CN112796724A (en) * | 2020-12-29 | 2021-05-14 | 安徽理工大学 | Method for dynamically driving water, fracturing and permeability increasing of low-permeability coal rock mass by continuous air cannon |
| CN112855105A (en) * | 2021-01-20 | 2021-05-28 | 长江大学 | Underground sealing and pressing integrated electric explosion pulse fracturing device |
| CN112943210A (en) * | 2021-02-08 | 2021-06-11 | 中国矿业大学 | Electric pulse and ultrasonic wave cooperated coalbed methane enhanced mining method |
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| CN105673067B (en) * | 2016-03-07 | 2018-02-13 | 中国矿业大学 | A kind of hydraulic fracturing and the device and method of the combined reinforced draining coal seam gas of microwave radiation |
| CN105673067A (en) * | 2016-03-07 | 2016-06-15 | 中国矿业大学 | Hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method |
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Application publication date: 20160203 |