CN111119829B - Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage - Google Patents
Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage Download PDFInfo
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- CN111119829B CN111119829B CN201911327151.7A CN201911327151A CN111119829B CN 111119829 B CN111119829 B CN 111119829B CN 201911327151 A CN201911327151 A CN 201911327151A CN 111119829 B CN111119829 B CN 111119829B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 218
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 109
- 239000007788 liquid Substances 0.000 title claims abstract description 94
- 239000007789 gas Substances 0.000 title claims abstract description 86
- 239000003245 coal Substances 0.000 title claims abstract description 75
- 230000001965 increasing effect Effects 0.000 title claims abstract description 28
- 230000035699 permeability Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008859 change Effects 0.000 title claims abstract description 13
- 238000000605 extraction Methods 0.000 claims description 27
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 238000005553 drilling Methods 0.000 claims description 16
- 239000011435 rock Substances 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000005336 cracking Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 238000002309 gasification Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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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
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- 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)
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- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a coal seam permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage. Wherein the spherical valve performs switch control on the nitrogen discharged when the liquid nitrogen is injected into the cross-layer drill hole; and when the spherical valve is closed, setting a threshold value of the safety valve, so that the safety valve controls the pressure in the through-layer drill hole, opening the safety valve when the air pressure in the through-layer drill hole exceeds the threshold value, discharging the nitrogen in the through-layer drill hole for pressure relief, and automatically closing the safety valve after the pressure relief. The method can ensure that liquid nitrogen is injected into the cross-layer drill hole quickly and continuously, and simultaneously, the coal body is fractured by utilizing the cold impact of the liquid nitrogen, the expansion pressure of the phase change gas and the frost heaving pressure of water in the fracture, so that the permeability increasing effect is effectively ensured.
Description
Technical Field
The invention relates to a coal seam permeability increasing method, in particular to a coal seam permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage.
Background
The coal bed with high gas content in the coal mine in China accounts for 50% -70%, the coal bed pressure and the gas pressure are continuously increased along with the continuous increase of the mining depth, the gas problem is serious day by day, and gas explosion and gas outburst become difficult problems to be solved urgently in mine safety production. Coal beds in China are mostly high-gas low-permeability coal beds, and the existing methods such as hydraulic fracturing, hydraulic slotting, presplitting blasting and the like are not enough to overcome the problems of high gas adsorption and low gas permeability of the coal beds, so that the existing gas extraction has low concentration, small extraction amount and unsatisfactory extraction effect. At present, the mode of liquid nitrogen injection well is widely concerned about the multiple action mechanisms of cold impact, phase change gas expansion force and water ice phase change frost heaving force. However, in practical tests, the existing liquid nitrogen well injection method and patent have the following significant problems: because the liquid nitrogen has a severe gasification problem in the well injection process, the volume of the liquid nitrogen has an expansion rate of 696 times after the liquid nitrogen is gasified and expanded to 21 ℃ pure nitrogen, which means that at the initial stage of the liquid nitrogen well injection, when the liquid nitrogen does not flow to the coal position, the drill hole is filled with the heated and gasified nitrogen and the air pressure continuously rises, the air pressure in the drill hole quickly reaches dozens of MPa, the liquid nitrogen causes the effective pressure and flow rate which can be provided by the well injection pump not to be high due to the poor stability of the liquid nitrogen, the difference is more than 10 times compared with the gas expansion pressure generated in the drill hole, finally the liquid nitrogen cannot be injected into the drill hole rapidly in large quantity, the liquid nitrogen can be injected into the drill hole only with extremely small flow, but the advantage of the permeability increase of the liquid nitrogen cannot be exerted (namely, the impact force of the volume expansion when the liquid nitrogen is gasified and the freezing effect of the coal due to the low temperature of the liquid nitrogen are superposed, once the liquid nitrogen is injected with small flow, the impact force of rapid expansion differential is lost); meanwhile, the time required for increasing the permeability of the coal seam is greatly increased, and the permeability increasing effect cannot be ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a coal seam permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage, which can ensure that liquid nitrogen is quickly and continuously injected into a cross-layer drill hole, and simultaneously, the cold impact of the liquid nitrogen, the expansion pressure of the phase change gas and the frost heaving pressure of water in cracks are utilized to crack coal, so that the permeability increasing effect is effectively ensured.
In order to achieve the purpose, the invention adopts the technical scheme that: a coal seam permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage comprises the following specific steps:
A. drilling at least one layer-penetrating drill hole in the roadway, wherein the drill hole penetrates through the rock stratum and extends into the coal seam;
B. hydraulic seam cutting equipment is adopted to stretch into the cross drilling hole to reach the coal seam, and a plurality of disc-shaped cracks are cut at equal intervals in the coal seam along the direction vertical to the cross drilling hole by taking the cross drilling hole as the center; the device is used for enabling liquid nitrogen to be fully contacted with coal after being injected, and a better fracturing and permeability-increasing effect is achieved;
C. one end of a liquid nitrogen injection pipe and one end of an exhaust pipe extend into the cross-layer drill hole to reach the coal seam, and then the liquid nitrogen injection pipe, the exhaust pipe and the cross-layer drill hole rock layer section are sealed; the other end of the exhaust pipe is communicated with a three-way pipe, and the other two openings of the three-way pipe are respectively connected with two gas pipelines; a safety valve and a spherical valve are respectively arranged on the two gas pipelines;
D. connecting the other end of the liquid nitrogen injection pipe with a liquid nitrogen pump, starting the liquid nitrogen pump and opening the spherical valve, injecting liquid nitrogen into the cross-layer drilled hole through the liquid nitrogen injection pipe and entering each disc-shaped crack, gasifying and absorbing heat by the liquid nitrogen to rapidly reduce the temperature of the coal body, and applying freezing expansion force to the coal body to crack by freezing and expanding moisture in the coal body; meanwhile, the gasified nitrogen rapidly expands in volume to apply gas expansion force to the coal body to crack, the air pressure in the through-layer drill hole is rapidly increased, and the nitrogen is exhausted from the gas pipeline where the spherical valve is located through the exhaust pipe to the through-layer drill hole, so that the air pressure in the through-layer drill hole is reduced to enable the liquid nitrogen to be continuously injected;
E. when liquid nitrogen flows out from a gas pipeline where the spherical valve is continuously injected by liquid nitrogen, stopping a liquid nitrogen pump, closing the spherical valve, setting the opening threshold of a safety valve, continuously gasifying and expanding the liquid nitrogen in the cross-layer drill hole, applying gas expansion force to the coal body to crack, when the gas pressure in the through-layer drill hole exceeds a set opening threshold value, the safety valve is opened, nitrogen in the through-layer drill hole is discharged out of the through-layer drill hole from the gas pipeline where the safety valve is positioned, thereby reducing the air pressure in the cross-layer drill hole, closing the safety valve when the air pressure is lower than a set opening threshold value, continuously gasifying and expanding the liquid nitrogen in the cross-layer drill hole, applying gas expansion force to the coal body again to crack until the gas pressure in the through-layer drill hole exceeds a set opening threshold value, opening the safety valve to release pressure, repeating the process, performing gas expansion force cracking on the coal body for multiple times until the safety valve is not opened after liquid nitrogen in the through-layer drill hole is completely gasified; completing the fracturing and permeability increasing process of the through-layer drilling;
F. two gas extraction drill holes are drilled in the coal seam on two sides of the cross-layer drill hole, and the two gas extraction drill holes penetrate through each disc-shaped crack; finally, gas extraction is carried out on the coal seam through the two gas extraction drilled holes;
G. and D, after the gas extraction of the position is finished, repeating the steps A to F at another position of the roadway at a certain distance, performing the coal bed permeability increasing and the gas extraction of the position, and circulating the steps until the coal bed permeability increasing and the gas extraction of the whole roadway are finished.
Further, the outer surface of the liquid nitrogen injection pipe is wrapped with a heat insulation layer. The gasification degree of liquid nitrogen when the liquid nitrogen is injected into the cross-layer drill hole through the liquid nitrogen injection pipe is reduced, and the amount of the liquid nitrogen entering the cross-layer drill hole is ensured, so that the fracturing effect of the cross-layer drill hole is improved.
Further, the opening threshold of the safety valve is 30 MPa.
Compared with the prior art, the method comprises the steps of firstly drilling a cross-layer drill hole in a roadway through a rock layer to the coal layer, utilizing hydraulic cutting equipment to cut a plurality of cracks perpendicular to the cross-layer drill hole in the cross-layer drill hole at equal intervals in the coal layer, extending a liquid nitrogen injection pipe and an exhaust pipe into the cross-layer drill hole, sealing a rock layer section of the cross-layer drill hole, arranging a three-way pipe on the exhaust pipe outside the cross-layer drill hole, connecting the other two openings of the three-way pipe with two gas pipelines respectively, and arranging a safety valve and a spherical valve on the two gas pipelines respectively. The spherical valve performs switch control on the nitrogen discharged when the liquid nitrogen is injected into the cross-layer drill hole, so that the speed of injecting the liquid nitrogen into the cross-layer drill hole can be controlled; and when the spherical valve is closed, setting a threshold value of the safety valve, so that the safety valve controls the pressure in the through-layer drill hole, opening the safety valve when the air pressure in the through-layer drill hole exceeds the threshold value, discharging the nitrogen in the through-layer drill hole for pressure relief, and automatically closing the safety valve after the pressure relief. The method makes full use of the cold impact of liquid nitrogen, the expansion pressure of the phase-change gas and the frost heaving pressure of residual moisture in the cracks to crack the coal body, has a wide effective cracking area, and particularly makes the expansion pressure of the phase-change gas reach the threshold value of the safety valve repeatedly along with the continuous gasification of the liquid nitrogen and the repeated opening of the safety valve, so that the coal body can be repeatedly expanded and damaged, and the fracture network of the coal body is enlarged. And when fracturing is finished, drilling two gas extraction drill holes at the periphery for gas extraction. The method can ensure that liquid nitrogen is injected into the through-layer drill hole quickly and continuously, and simultaneously, the coal body is fractured by utilizing the cold impact of the liquid nitrogen, the expansion pressure of the phase-change gas and the frost heaving pressure of water in the fracture, so that the permeability increasing effect is effectively ensured.
Drawings
FIG. 1 is a perspective view of the construction layout of the present invention.
In the figure: 1. the method comprises the following steps of (1) coal bed, 2 disc-shaped cracks, 3 rock stratum, 4 spherical valve, 5 safety valve, 6 liquid nitrogen injection pipe, 7 gas extraction hole, 8 cross-layer drilling hole, 9 exhaust pipe.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, the method comprises the following specific steps:
A. two cross-layer drill holes 8 are drilled in the roadway, penetrate through the rock stratum 3 and extend into the coal seam 1;
B. hydraulic slotting equipment is adopted to stretch into the cross drilling holes 8 to reach the coal seam 1, and a plurality of disc-shaped cracks 2 are cut at equal intervals in the coal seam 1 along the direction vertical to the cross drilling holes 8 by taking the cross drilling holes 8 as the center; the device is used for enabling liquid nitrogen to be fully contacted with coal after being injected, and a better fracturing and permeability-increasing effect is achieved;
C. one end of a liquid nitrogen injection pipe 6 and one end of an exhaust pipe 9 extend into the cross-layer drill hole 8 to reach the coal bed, and then the liquid nitrogen injection pipe and the exhaust pipe 9 are sealed with the rock bed section of the cross-layer drill hole 8; the other end of the exhaust pipe 9 is communicated with a three-way pipe, and the other two openings of the three-way pipe are respectively connected with two gas pipelines; a safety valve 5 and a ball valve 4 are respectively arranged on the two gas pipelines;
D. the other end of the liquid nitrogen injection pipe 6 is connected with a liquid nitrogen pump, the liquid nitrogen pump is started, the spherical valve 4 is opened, liquid nitrogen is injected into the cross-layer drill hole 8 through the liquid nitrogen injection pipe 6 and enters each disc-shaped crack 2, the temperature of the coal body is rapidly reduced through gasification and heat absorption of the liquid nitrogen, and freezing expansion force is applied to the coal body by freezing and expanding moisture in the coal body to cause cracking; meanwhile, the gasified nitrogen rapidly expands in volume to apply gas expansion force to the coal body to crack, the air pressure in the through-layer drill hole 8 is rapidly increased, and the nitrogen is exhausted from the gas pipeline where the spherical valve 4 is located through the exhaust pipe 9 to the through-layer drill hole 8, so that the air pressure in the through-layer drill hole 8 is reduced, and the liquid nitrogen is continuously injected;
E. when liquid nitrogen flows out from a gas pipeline where the spherical valve 4 is continuously injected by liquid nitrogen, stopping a liquid nitrogen pump, closing the spherical valve 4, setting an opening threshold value of the safety valve 5, continuously gasifying and expanding the liquid nitrogen in the through-layer drill hole 8, applying gas expansion force to the coal body to crack, when the gas pressure in the through-layer drill hole 8 exceeds the set opening threshold value, opening the safety valve 5, discharging the nitrogen in the through-layer drill hole 8 out of the through-layer drill hole 8 from the gas pipeline where the safety valve 5 is located, so that the gas pressure in the through-layer drill hole 8 is reduced, closing the safety valve 5 when the gas pressure is lower than the set opening threshold value, continuously gasifying and expanding the liquid nitrogen in the through-layer drill hole 8 at the moment, applying gas expansion force to the coal body again to crack until the gas pressure in the through-layer drill hole 8 exceeds the set opening threshold value, opening and relieving the pressure of the safety valve 5, repeating the cycle, and performing gas expansion force crack on the coal body for multiple times, the safety valve 5 is not opened until the liquid nitrogen in the cross-layer drill hole 8 is completely gasified; completing the fracturing and permeability increasing process of the through-layer drill hole 8;
F. two gas extraction drill holes 7 are drilled in the coal seam 1 at two sides of the cross-layer drill hole 8, and the two gas extraction drill holes 7 penetrate through each disc-shaped crack 2; finally, gas extraction is carried out on the coal seam through the two gas extraction drill holes 7;
G. and D, after the gas extraction of the position is finished, repeating the steps A to F at another position of the roadway at a certain distance, performing the coal bed permeability increasing and the gas extraction of the position, and circulating the steps until the coal bed permeability increasing and the gas extraction of the whole roadway are finished.
Further, the outer surface of the liquid nitrogen injection pipe 6 is wrapped with a heat insulation layer. The gasification degree of liquid nitrogen when injected into the cross-layer drill hole through the liquid nitrogen injection pipe 6 is reduced, and the amount of liquid nitrogen entering the cross-layer drill hole 8 is ensured, so that the fracturing effect is improved.
Further, the opening threshold of the safety valve 5 is 30 MPa.
Claims (3)
1. A coal seam permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage is characterized by comprising the following specific steps:
A. drilling at least one layer-penetrating drill hole in the roadway, wherein the drill hole penetrates through the rock stratum and extends into the coal seam;
B. hydraulic seam cutting equipment is adopted to stretch into the cross drilling hole to reach the coal seam, and a plurality of disc-shaped cracks are cut at equal intervals in the coal seam along the direction vertical to the cross drilling hole by taking the cross drilling hole as the center;
C. one end of a liquid nitrogen injection pipe and one end of an exhaust pipe extend into the cross-layer drill hole to reach the coal seam, and then the liquid nitrogen injection pipe, the exhaust pipe and the cross-layer drill hole rock layer section are sealed; the other end of the exhaust pipe is communicated with a three-way pipe, and the other two openings of the three-way pipe are respectively connected with two gas pipelines; a safety valve and a spherical valve are respectively arranged on the two gas pipelines;
D. connecting the other end of the liquid nitrogen injection pipe with a liquid nitrogen pump, starting the liquid nitrogen pump and opening the spherical valve, injecting liquid nitrogen into the cross-layer drilled hole through the liquid nitrogen injection pipe and entering each disc-shaped crack, gasifying and absorbing heat by the liquid nitrogen to rapidly reduce the temperature of the coal body, and applying freezing expansion force to the coal body to crack by freezing and expanding moisture in the coal body; meanwhile, the gasified nitrogen rapidly expands in volume to apply gas expansion force to the coal body to crack, the air pressure in the through-layer drill hole is rapidly increased, and the nitrogen is exhausted from the gas pipeline where the spherical valve is located through the exhaust pipe to the through-layer drill hole, so that the air pressure in the through-layer drill hole is reduced, and the liquid nitrogen can be continuously injected;
E. when liquid nitrogen flows out from a gas pipeline where the spherical valve is continuously injected by liquid nitrogen, stopping a liquid nitrogen pump, closing the spherical valve, setting the opening threshold of a safety valve, continuously gasifying and expanding the liquid nitrogen in the cross-layer drill hole, applying gas expansion force to the coal body to crack, when the gas pressure in the through-layer drill hole exceeds a set opening threshold value, the safety valve is opened, nitrogen in the through-layer drill hole is discharged out of the through-layer drill hole from the gas pipeline where the safety valve is positioned, thereby reducing the air pressure in the cross-layer drill hole, closing the safety valve when the air pressure is lower than a set opening threshold value, continuously gasifying and expanding the liquid nitrogen in the cross-layer drill hole, applying gas expansion force to the coal body again to crack until the gas pressure in the through-layer drill hole exceeds a set opening threshold value, opening the safety valve to release pressure, repeating the process, performing gas expansion force cracking on the coal body for multiple times until the safety valve is not opened after liquid nitrogen in the through-layer drill hole is completely gasified; completing the fracturing and permeability increasing process of the through-layer drilling;
F. two gas extraction drill holes are drilled in the coal seam on two sides of the cross-layer drill hole, and the two gas extraction drill holes penetrate through each disc-shaped crack; finally, gas extraction is carried out on the coal seam through the two gas extraction drilled holes;
G. and D, after the gas extraction of the position is finished, repeating the steps A to F at another position of the roadway at a certain distance, performing the coal bed permeability increasing and the gas extraction of the position, and circulating the steps until the coal bed permeability increasing and the gas extraction of the whole roadway are finished.
2. The method for increasing the permeability of the coal seam by utilizing liquid nitrogen cold impact and phase change gas circulation damage according to claim 1, wherein a heat insulation layer is wrapped on the outer surface of the liquid nitrogen injection pipe.
3. The method for permeability improvement of the coal seam damaged by liquid nitrogen cold impact and phase change gas circulation according to claim 1, wherein the opening threshold of the safety valve is 30 MPa.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911327151.7A CN111119829B (en) | 2019-12-20 | 2019-12-20 | Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage |
| PCT/CN2020/113351 WO2021120701A1 (en) | 2019-12-20 | 2020-09-04 | Coal seam permeability increasing method utilizing cyclic damage of liquid nitrogen cold impact and phase change gas |
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| CN201911327151.7A CN111119829B (en) | 2019-12-20 | 2019-12-20 | Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage |
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| CN111119829A CN111119829A (en) | 2020-05-08 |
| CN111119829B true CN111119829B (en) | 2021-07-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111119829B (en) * | 2019-12-20 | 2021-07-23 | 中国矿业大学 | Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage |
| CN111894541B (en) * | 2020-06-23 | 2021-04-23 | 中国矿业大学 | Negative pressure retreating type injection low-temperature fluid staged circulating fracturing method |
| CN111894542B (en) * | 2020-06-24 | 2021-07-02 | 中国矿业大学 | Low-temperature fluid reinforced injection ice blocking fracturing method for horizontal well |
| CN112412415B (en) * | 2020-11-05 | 2022-11-04 | 河南理工大学 | Hydraulic punching, freezing fracturing and heat injection stimulation synergistic permeability-increasing pumping-promoting method |
| CN113586022B (en) * | 2021-06-04 | 2023-06-27 | 广州海洋地质调查局 | Method and device for improving yield of natural gas hydrate reservoir through freezing fracturing |
| CN114137160A (en) * | 2021-11-23 | 2022-03-04 | 重庆大学 | Migration experiment device and method for harmful gas in surrounding rock under tunnel excavation disturbance |
| CN114352345B (en) * | 2022-01-15 | 2022-09-09 | 中国矿业大学 | Low-permeability inclined coal seam coal and gas fluidization co-mining system and method |
| CN114508336B (en) * | 2022-01-30 | 2022-09-30 | 中国矿业大学 | Drilling, unfreezing and fracturing integrated device and method for soft coal seam |
| CN115876975A (en) * | 2022-11-23 | 2023-03-31 | 山东大学 | Liquid nitrogen cooling physical simulation test device and method for high-temperature water-rich tunnel |
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| WO2021120701A1 (en) | 2021-06-24 |
| CN111119829A (en) | 2020-05-08 |
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