CN109162755B - Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement - Google Patents
Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement Download PDFInfo
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- CN109162755B CN109162755B CN201811054978.0A CN201811054978A CN109162755B CN 109162755 B CN109162755 B CN 109162755B CN 201811054978 A CN201811054978 A CN 201811054978A CN 109162755 B CN109162755 B CN 109162755B
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- 239000003245 coal Substances 0.000 title claims abstract description 99
- 230000002787 reinforcement Effects 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 15
- 238000007796 conventional method Methods 0.000 claims description 5
- 230000005641 tunneling Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 5
- 238000003795 desorption Methods 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement, which comprises the following steps: drilling a hole in the coal seam construction from the coal uncovering working face, feeding the discharge electrode and the high-voltage cable into the hole, and then injecting water into the hole; discharging to water in the drill hole through an explosion-proof high-voltage electric pulse generator and a discharge electrode to form strong shock waves, so that the coal body is fractured, the gas desorption is promoted, and the drill hole is connected into a gas extraction pipeline after the discharge for many times is finished; and then injecting cement slurry into the coal seam to enhance the mechanical strength of the coal body, so that the coal seam is reinforced, and finally, uncovering the coal. The invention combines the electric pulse fracturing and grouting reinforcement methods, not only improves the porosity and permeability of the coal bed, promotes the desorption of gas, effectively prevents the danger of coal and gas outburst, but also reinforces the coal bed, and is beneficial to improving the safety of cross-cut coal uncovering.
Description
Technical Field
The invention relates to the technical field of cross-cut coal uncovering, in particular to a cross-cut coal uncovering method suitable for combining electric pulse and grouting reinforcement of an easily-protruded high-gas coal seam.
Background
Coal and gas outburst is one of the most common disasters in underground operation, and the average outburst strength in the process of rock cross-cut coal uncovering is far greater than the sum of the outburst strengths of other various roadways. The outstanding problem when the cross cut coal is uncovered seriously threatens the safety of underground workers and simultaneously restricts the high-efficiency production of coal mines. Research shows that the rock cross section is the result of the comprehensive effect of factors such as gas pressure, ground stress and the mechanical property of coal, wherein the mechanical strength of the coal is a key factor for resisting the cross section.
The existing outburst coal seam uncovering method is mainly carried out from two aspects of pressure relief and permeability increase and coal seam reinforcement, the pressure relief and permeability increase modes of the coal seam mainly comprise measures such as hydraulic punching, hydraulic fracturing and hydraulic slotting, and the coal seam reinforcement mainly comprises measures such as metal frameworks and grouting reinforcement. The measures have some effects in rock cross-cut coal uncovering outburst prevention, but the problems of high construction difficulty, low efficiency and the like exist, and the production progress of the coal mine is severely limited. Therefore, the rock cross-cut coal uncovering method which is simple, efficient, safe and fast is urgently needed to be provided.
Disclosure of Invention
The invention aims to provide a safe and efficient rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an electric pulse and grouting reinforcement combined rock cross-cut coal uncovering method comprises the following steps:
a. before the distance between the coal uncovering working face and the normal direction of the coal bed is less than 7m, drilling holes in the coal bed in a conventional drilling mode;
b. after the drilling construction is completed, respectively sleeving a positive high-voltage cable and a negative high-voltage cable in a cable protective pipe at the coal uncovering working face, respectively connecting a discharge electrode and an explosion-proof high-voltage electric pulse generator through the positive high-voltage cable and the negative high-voltage cable, sending the discharge electrode to the bottom of a pre-drilled hole by using the cable protective pipe, sending a high-voltage rubber pipe into the drilled hole, connecting two paths of the high-voltage rubber pipe exposed out of one end of the drilled hole, sequentially connecting one path of the high-voltage rubber pipe with a grouting control valve, a grouting pump and a slurry tank, and sequentially connecting the other path of the high-; sealing the drilled hole by a hole packer and plugging the cable protective pipe by a plug;
c. after sealing is finished, a water injection switch is turned on, a water pump is turned on, water is injected into the drill hole until the drill hole is filled with water, and the water injection switch is turned off;
d. starting the explosion-proof high-voltage electric pulse generator, discharging in water through the discharge electrode, and stopping discharging after repeated discharging for 10-300 times; the discharge electrode is retreated outwards by 3-10m by using the cable protective tube, and the discharge step is repeated until the discharge electrode completely exits from the drill hole;
e. discharging water in the drill hole through a water pump and a high-pressure rubber pipe, taking out the discharge electrode and the cable protection pipe, then sealing the hole again, and connecting the high-pressure rubber pipe with an underground gas extraction pipe for gas extraction;
f. and after gas extraction is finished, opening a grouting control valve, injecting prepared cement slurry into the drill hole by using a grouting pump, injecting the slurry into the cracks of the coal body to consolidate the coal body, and then tunneling according to a conventional method until the slurry penetrates through the coal bed and enters the top plate for 2m, thereby finishing the coal uncovering work.
Preferably, the frequency of the explosion-proof high-voltage electric pulse generator is 5-10Hz, the number of pulses is 200-800, and the voltage range is 0-600 kV.
Preferably, in step f, the cement slurry has a water-cement ratio of 1: 1.5.
preferably, in the step f, the grouting pressure is 0.5-1.5MPa, the flow rate is 10-30L/min, and the grouting time is 1-5 h.
Preferably, in step c, the water injection pressure is 0.3-0.9 MPa. More preferably, the water injection pressure is 0.6 MPa.
Preferably, in step d, the discharge electrode is retracted by 6m by the cable sheath.
Preferably, the cable protection tube is made of a steel tube.
The invention generates strong shock wave to act on coal body through discharging high voltage electric pulse in water, which makes coal body generate crack and promotes desorption of gas. Cement mortar is injected into the coal bed after gas extraction, so that the coal body is reinforced, and the coal uncovering operation is facilitated. The invention combines electric pulse fracturing and grouting reinforcement, not only improves the porosity and permeability of the coal bed, promotes the desorption of gas and greatly reduces the gas pressure in the coal bed, but also ensures that the formed cracks are beneficial to the diffusion of slurry in the coal body, improves the strength of the coal body, thereby improving the safety of rock cross-cut coal uncovering and has wide practical value in the technical field.
Drawings
FIG. 1 is a schematic diagram of the present invention of electrical pulse combined with grouting reinforcement for rock cross-cut coal uncovering.
FIG. 2 is a schematic view of the connection of the explosion-proof high-voltage electric pulse generator, the grouting pump station and the water injection pump station.
FIG. 3 is a schematic view of the A-A coal uncovering face drilling arrangement in FIG. 1.
In the figure: 1-an explosion-proof high-voltage electric pulse generator, 2-a plug, 3-a cable protective pipe, 4-a discharge electrode, 5-a positive high-voltage cable, 6-a negative high-voltage cable, 7-a high-voltage rubber pipe, 8-a hole packer, 9-a grouting control valve, 10-a grouting pump, 11-a slurry tank, 12-a grouting control valve, 13-a water pump, 14-a water tank, 15-a coal bed, 16-a drill hole and 17-a coal uncovering working face.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
As shown in fig. 1 and fig. 2, the rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement of the invention comprises the following steps:
a. before the distance between the coal uncovering working face 17 and the normal direction of the coal seam 15 is less than 7m, drilling holes 16 with the diameter of 10cm are constructed on the coal seam 15 in a conventional drilling mode, and the drilling holes are distributed in a rectangular array as shown in fig. 3;
b. after the construction of the drill hole 16 is completed, a positive high-voltage cable 5 and a negative high-voltage cable 6 are respectively sleeved in a cable protective pipe 3 with the diameter of 3cm at a coal uncovering working surface 17, a discharge electrode 4 and an explosion-proof high-voltage electric pulse generator 1 are respectively connected through the positive high-voltage cable 5 and the negative high-voltage cable 6, the discharge electrode 4 is conveyed to the bottom of the drill hole by using the cable protective pipe 3, a high-voltage rubber pipe 7 with the diameter of 2cm is conveyed into the drill hole 16, one end, exposed out of the drill hole 16, of the high-voltage rubber pipe 7 is connected with two paths, one path is sequentially connected with a grouting control valve 9, a grouting pump 10 and a slurry tank 11, and the other path is sequentially connected with a water injection; sealing the drill hole 16 by a hole packer 8, and plugging the cable protective tube 3 by a plug 2;
c. after sealing is finished, a water injection switch 12 is turned on, a water pump 13 is turned on, water in a water tank 14 is injected into the drill hole 16, the pressure is 0.6MPa, and the water injection switch 12 is turned off until the drill hole 16 is filled with the water;
d. starting the explosion-proof high-voltage electric pulse generator 1 and discharging in water through the discharge electrode 4 to form strong shock waves to act on the coal seam 15, so that the coal seam 15 is broken, and stopping discharging after repeating discharging for 260 times; the discharge electrode 4 is retreated outwards by 6m by using the cable protective tube 3, and the discharge step is repeated until the discharge electrode 4 completely exits from the drilling hole;
e. discharging water in the drill hole 16 through a water pump 13 and a high-pressure rubber tube 7, taking out the discharge electrode 4 and the cable protection tube 3, then sealing holes again, and connecting the high-pressure rubber tube 7 with an underground gas extraction pipe for gas extraction;
f. after gas extraction is finished, a grouting control valve 9 is opened, cement slurry (the water-cement ratio is 1: 1.5, the grouting pressure is 0.9MPa, the flow rate is 15L/min, and the grouting time is 3 hours) prepared in a slurry tank 11 is injected into a drill hole 16 by using a grouting pump 10, so that the slurry is injected into cracks of a coal body to reinforce the coal body around the drill hole 16, and then tunneling is carried out according to a conventional method until the slurry penetrates through a coal bed and enters a top plate for 2m, so that coal uncovering work is finished.
Example 2
As shown in fig. 1 and fig. 2, the rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement of the invention comprises the following steps:
a. before the distance between the coal uncovering working face 17 and the normal direction of the coal seam 15 is less than 7m, drilling holes 16 with the diameter of 10cm are constructed on the coal seam 15 in a conventional drilling mode, and the drilling holes are distributed in a rectangular array as shown in fig. 3;
b. after the construction of the drill hole 16 is completed, a positive high-voltage cable 5 and a negative high-voltage cable 6 are respectively sleeved in a cable protective pipe 3 with the diameter of 3cm at a coal uncovering working surface 17, a discharge electrode 4 and an explosion-proof high-voltage electric pulse generator 1 are respectively connected through the positive high-voltage cable 5 and the negative high-voltage cable 6, the discharge electrode 4 is sent to the bottom of a pre-drilled hole by using the cable protective pipe 3, a high-voltage rubber pipe 7 with the diameter of 2cm is sent into the drill hole 16, one end, exposed out of the drill hole 16, of the high-voltage rubber pipe 7 is connected with two paths, one path is sequentially connected with a grouting control valve 9, a grouting pump 10 and a slurry tank 11, and the other path is sequentially connected with a; sealing the drill hole 16 by a hole packer 8, and plugging the cable protective tube 3 by a plug 2;
c. after sealing is finished, a water injection switch 12 is turned on, a water pump 13 is turned on, water in a water tank 14 is injected into the drill hole 16, the pressure is 0.3MPa, and the water injection switch 12 is turned off until the drill hole 16 is filled with the water;
d. starting the explosion-proof high-voltage electric pulse generator 1 and discharging in water through the discharge electrode 4 to form strong shock waves to act on the coal seam 15, so that the coal seam 15 is broken, and stopping discharging after repeating discharging for 10 times; the discharge electrode 4 is retreated outwards by 3m by using the cable protective tube 3, and the discharge step is repeated until the discharge electrode 4 completely exits from the drilling hole;
e. discharging water in the drill hole 16 through a water pump 13 and a high-pressure rubber tube 7, taking out the discharge electrode 4 and the cable protection tube 3, then sealing holes again, and connecting the high-pressure rubber tube 7 with an underground gas extraction pipe for gas extraction;
f. after gas extraction is finished, a grouting control valve 9 is opened, cement slurry (the water-cement ratio is 1: 1.5, the grouting pressure is 0.5MPa, the flow rate is 10L/min, and the grouting time is 5 hours) prepared in a slurry tank 11 is injected into a drill hole 16 by using a grouting pump 10, so that the slurry is injected into cracks of a coal body to reinforce the coal body around the drill hole 16, and then tunneling is carried out according to a conventional method until the slurry penetrates through a coal bed and enters a top plate for 2m, and the coal uncovering work is finished.
Example 3
As shown in fig. 1 and fig. 2, the rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement of the invention comprises the following steps:
a. before the distance between the coal uncovering working face 17 and the normal direction of the coal seam 15 is less than 7m, drilling holes 16 with the diameter of 10cm are constructed on the coal seam 15 in a conventional drilling mode, and the drilling holes are distributed in a rectangular array as shown in fig. 3;
b. after the construction of the drill hole 16 is completed, a positive high-voltage cable 5 and a negative high-voltage cable 6 are respectively sleeved in a cable protective pipe 3 with the diameter of 3cm at a coal uncovering working surface 17, a discharge electrode 4 and an explosion-proof high-voltage electric pulse generator 1 are respectively connected through the positive high-voltage cable 5 and the negative high-voltage cable 6, the discharge electrode 4 is sent to the bottom of a pre-drilled hole by using the cable protective pipe 3, a high-voltage rubber pipe 7 with the diameter of 2cm is sent into the drill hole 16, one end, exposed out of the drill hole 16, of the high-voltage rubber pipe 7 is connected with two paths, one path is sequentially connected with a grouting control valve 9, a grouting pump 10 and a slurry tank 11, and the other path is sequentially connected with a; sealing the drill hole 16 by a hole packer 8, and plugging the cable protective tube 3 by a plug 2;
c. after sealing is finished, a water injection switch 12 is turned on, a water pump 13 is turned on, water in a water tank 14 is injected into the drill hole 16, the pressure is 0.9MPa, and the water injection switch 12 is turned off until the drill hole 16 is filled with the water;
d. starting the explosion-proof high-voltage electric pulse generator 1 and discharging in water through the discharge electrode 4 to form strong shock waves to act on the coal seam 15, so that the coal seam 15 is broken, and stopping discharging after repeating discharging for 300 times; the discharge electrode 4 is retreated outwards by 10m by using the cable protective tube 3, and the discharge step is repeated until the discharge electrode 4 completely exits from the drilling hole;
e. discharging water in the drill hole 16 through a water pump 13 and a high-pressure rubber tube 7, taking out the discharge electrode 4 and the cable protection tube 3, then sealing holes again, and connecting the high-pressure rubber tube 7 with an underground gas extraction pipe for gas extraction;
f. after gas extraction is finished, a grouting control valve 9 is opened, cement slurry (the water-cement ratio is 1: 1.5, the grouting pressure is 1.5MPa, the flow rate is 30L/min, and the grouting time is 1h) prepared in a slurry tank 11 is injected into a drill hole 16 by using a grouting pump 10, so that the slurry is injected into cracks of a coal body to reinforce the coal body around the drill hole 16, and then tunneling is carried out according to a conventional method until the slurry penetrates through a coal bed and enters a top plate for 2m, and the coal uncovering work is finished.
In the above embodiment, the frequency of the explosion-proof high-voltage electric pulse generator 1 is 5-10Hz, the number of pulses is 200-800, and the voltage range is 0-600 kV.
The cable protection pipe 3 is made of a steel pipe.
Claims (4)
1. The rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement is characterized by comprising the following steps of:
a. before the normal distance between the coal uncovering working face (17) and the coal seam (15) is less than 7m, drilling holes (16) are constructed in the coal seam (15) in a conventional drilling mode;
b. after the construction of the drill hole (16) is finished, respectively sleeving a positive high-voltage cable (5) and a negative high-voltage cable (6) in a cable protective pipe (3) at a coal uncovering working surface (17), respectively connecting a discharge electrode (4) and an explosion-proof high-voltage electric pulse generator (1) through the positive high-voltage cable (5) and the negative high-voltage cable (6), sending the discharge electrode (4) to the bottom of the drill hole by using the cable protective pipe (3), sending a high-voltage rubber pipe (7) into the drill hole (16), connecting two paths of one end of the high-voltage rubber pipe (7) exposed out of the drill hole (16), sequentially connecting a grouting control valve (9), a grouting pump (10) and a slurry tank (11) with one path, and sequentially connecting a water injection switch (12), a water pump (13) and a water tank (14) with the other path; sealing the drill hole (16) by a hole packer (8), and plugging the cable protective tube (3) by a plug (2); the frequency of the explosion-proof high-voltage electric pulse generator (1) is 5-10Hz, the number of pulses is 200-800, and the voltage range is 0-600 kV;
c. after sealing is finished, a water injection switch (12) is opened, a water pump (13) is started, water is injected into the drill hole (16) until the drill hole (16) is filled with water, the water injection switch (12) is closed, and the water injection pressure is 0.3-0.9 MPa;
d. starting the explosion-proof high-voltage electric pulse generator (1), discharging in water through the discharge electrode (4), and stopping discharging after repeated discharging for 10-300 times; the discharge electrode (4) is retreated outwards by 3-10m by using the cable protective tube (3), and the discharge step is repeated until the discharge electrode (4) completely retreats from the drill hole (16);
e. discharging water in the drill hole (16) through a water pump (13) and a high-pressure rubber tube (7), taking out the discharge electrode (4) and the cable protective tube (3), then sealing the hole again, connecting the high-pressure rubber tube (7) with an underground gas extraction pipe, and extracting gas;
f. after gas extraction is finished, opening a grouting control valve (9), injecting prepared cement slurry into a drill hole (16) by using a grouting pump (10), injecting the slurry into a crack of a coal body to reinforce the coal body around the drill hole (16), wherein the water-cement ratio of the cement slurry is 1: 1.5, the grouting pressure is 0.5-1.5MPa, the flow rate is 10-30L/min, the grouting time is 1-5h, and then tunneling is carried out according to a conventional method until the cement slurry penetrates through a coal bed and enters a top plate for 2m, so that coal uncovering work is finished.
2. The method for rock cross-cut coal uncovering combined electric pulse and grouting reinforcement as claimed in claim 1, wherein in the step c, the water injection pressure is 0.6 MPa.
3. The method for rock cross-cut coal uncovering combined electric pulse and grouting reinforcement as claimed in claim 1, wherein in the step d, the discharge electrode is retracted 6m by using a cable protection tube.
4. The method for rock cross-cut coal uncovering combined with electric pulse and grouting reinforcement according to claim 1, characterized in that the cable protective pipe (3) is made of a steel pipe.
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| CN110159305B (en) * | 2019-04-12 | 2020-10-20 | 平顶山天安煤业股份有限公司 | Method for optimizing coal wall grouting parameters of composite roof working surface with large mining depth and large mining height |
| CN112709572A (en) * | 2019-10-24 | 2021-04-27 | 西安闪光能源科技有限公司 | Rock cross-cut coal uncovering method based on controllable shock wave permeability increase |
| CN111520140A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing |
| CN111520182A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Electric pulse fracturing and gas injection displacement synergistic regional gas extraction method |
| CN112096382B (en) * | 2020-08-25 | 2021-09-24 | 中国矿业大学 | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway |
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| CN112814609B (en) * | 2021-01-05 | 2023-02-21 | 平顶山学院 | A sealed stopper device of recoverable formula for coal seam roof reinforcing operation |
| CN112855073B (en) * | 2021-02-04 | 2022-09-20 | 河南理工大学 | Device and method for solidifying coal bed by using microorganisms in cross-cut coal uncovering process |
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| CN101603431B (en) * | 2009-07-14 | 2011-05-11 | 中国矿业大学 | Method for reinforcing outburst-prone coal seam cross-cut coal uncovering |
| CN102155254B (en) * | 2011-02-28 | 2013-05-22 | 中国矿业大学 | Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection |
| CN102562067A (en) * | 2012-01-17 | 2012-07-11 | 河南省煤层气开发利用有限公司 | Method for controlling rock burst by pulse fracturing |
| CN103510957B (en) * | 2013-10-08 | 2016-04-20 | 中国矿业大学 | A kind of combined type coal uncovering method |
| CN104061014B (en) * | 2014-07-07 | 2016-03-02 | 太原理工大学 | A kind of coal seam anti-reflection experimental device based on high electric field pulse |
| CN104863561B (en) * | 2015-04-15 | 2017-06-23 | 中国矿业大学 | A kind of down-hole coal bed pulse detonation wave orientation fracturing anti-reflection method |
| CN104832149A (en) * | 2015-05-16 | 2015-08-12 | 太原理工大学 | Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method |
| CN105298462A (en) * | 2015-11-06 | 2016-02-03 | 中国矿业大学 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
| CN105275443B (en) * | 2015-11-06 | 2018-10-19 | 中国矿业大学 | A kind of underground coal mine high power electric detonation shake auxiliary hydraulic fracturing anti-reflection method |
| RU2626104C1 (en) * | 2016-07-15 | 2017-07-21 | Общество с ограниченной ответственностью "Георезонанс" | Method for prliminary degassing of coal beds |
| CN106285608A (en) * | 2016-10-28 | 2017-01-04 | 中国矿业大学 | A kind of coal bed gas well pulse-knocking fracturing seepage increasing method |
| CN106321142A (en) * | 2016-11-01 | 2017-01-11 | 中国矿业大学 | Rock cross-cut coal uncovering method combining microwave-assisted extraction with grouting reinforcement |
| CN107630717B (en) * | 2017-09-18 | 2020-02-07 | 中国矿业大学 | Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation |
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