CN116927860A - Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam - Google Patents
Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam Download PDFInfo
- Publication number
- CN116927860A CN116927860A CN202310556887.1A CN202310556887A CN116927860A CN 116927860 A CN116927860 A CN 116927860A CN 202310556887 A CN202310556887 A CN 202310556887A CN 116927860 A CN116927860 A CN 116927860A
- Authority
- CN
- China
- Prior art keywords
- drill rod
- seam
- directional
- outburst
- coal seam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000002265 prevention Effects 0.000 title description 5
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000035939 shock Effects 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000035699 permeability Effects 0.000 abstract description 16
- 238000003795 desorption Methods 0.000 abstract description 4
- 230000005012 migration Effects 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
Landscapes
- 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)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a directional large-range seam making, permeability increasing and outburst preventing method for a high-gas coal seam, which comprises the steps of firstly, constructing directional drilling holes, and cutting a plurality of seam grooves in the directional drilling holes; step two, withdrawing the hollow drill rod, arranging a discharge electrode of the connecting cable at the front end of the hollow drill rod, and sending the discharge electrode into a drilled hole through the hollow drill rod; step three, hole sealing is carried out by using a hole packer, and hydraulic fracturing is carried out; step four to step six, finish repeating the electric pulse discharge operation many times; and step seven, connecting a gas extraction pipeline to carry out gas extraction. The method utilizes the comprehensive means of hydraulic slotting, high-pressure hydraulic fracturing and high-pressure electric pulse to crack and enhance permeability of the coal seam, changes the occurrence state of gas, promotes desorption and migration of the gas, improves the gas extraction efficiency, and reduces the outburst risk of coal and gas.
Description
Technical Field
The invention relates to the technical field of coal mine safety and efficient mining, in particular to a directional large-range seam making, permeability increasing and outburst preventing method for a high-gas coal seam.
Background
In 2021, in the primary energy consumption structure of China, the coal ratio reaches more than 55%, and the coal is still a main source of energy in China. The high-gas coal mine in China accounts for more than 30% of the total number of the coal mines in China, and has the risk of coal and gas outburst, so that the safe and efficient production of the coal mine is seriously threatened. The coal and gas outburst is a phenomenon of special gas emission, namely, the phenomenon that broken coal and gas are suddenly sprayed out to a mining space in a large quantity under the action of pressure, and the coal and gas outburst is extremely destructive.
High gas coal mines in China generally have the characteristic of low permeability, so that gas extraction is difficult. In recent years, along with the increasing of the coal mining depth, the coal mining environment and geological conditions are increasingly worsened, the problem of coal and gas outburst is increasingly serious, once the coal and gas outburst happens, the coal mining efficiency is influenced, the casualties and the equipment damage are caused, and huge economic loss and bad social influence are brought. Therefore, measures are needed to increase the permeability of the coal bed, increase the number of cracks, improve the permeability of the coal bed, promote the desorption of gas and improve the gas extraction efficiency. However, at present, the anti-reflection and outburst prevention means for the high-gas coal seam are single, and the outburst prevention effect is not ideal.
Disclosure of Invention
The invention aims to provide a method suitable for high-gas coal seam permeability improvement and outburst prevention, which improves the coal seam permeability, promotes gas desorption and improves the gas extraction efficiency.
The technical scheme adopted by the invention is as follows: a directional large-range seam making, permeability increasing and outburst preventing method for a high-gas coal seam comprises the following steps:
firstly, selecting a target coal seam, constructing a directional drilling hole in the target coal seam by using a directional drilling machine, and cutting a plurality of slots in the directional drilling hole by using a slot cutter;
step two, after the directional drilling construction is completed, withdrawing the hollow drill rod, unscrewing a drill bit and a slotting device at the front end of the hollow drill rod, arranging a discharge electrode of a connecting cable at the front end of the hollow drill rod, and sending the discharge electrode into the directional drilling through the hollow drill rod; the middle part of the hollow drill rod is provided with a pressure sensor, and the pressure sensor is utilized to monitor and record the pressure change in the directional hole of the drill in real time;
step three, hole sealing is carried out by using a hole packer, and then high-pressure water is continuously injected into the directional drilling hole through the hollow drill rod by operating the control valve to carry out hydraulic fracturing;
step four, after hydraulic fracturing is completed, remotely setting charging voltage by using a computer, sending a charging command, starting to charge a capacitor by a high-voltage charging power supply, and stopping charging when the voltage value reaches a preset voltage;
step five, after the charging is finished, a computer is used for sending a discharging command through an optical fiber, a high-voltage discharging switch is used for communicating a capacitor with a discharging electrode, and an electric pulse generating system is started remotely to finish 1-time discharging; the discharge electrode discharges in water, the electric energy is converted into mechanical energy, and a shock wave which propagates outwards in a spherical shape is formed and acts on a coal body to enable the coal body to generate new cracks, and meanwhile, the directional large-range cracks generated by hydraulic slotting and hydraulic fracturing are further expanded and extended;
step six, after repeated electric pulse discharging operation for a plurality of times, switching off the high-voltage discharging switch, and stopping discharging; after the discharge is completed, the hollow drill rod and the discharge electrode are withdrawn;
and step seven, connecting a gas extraction pipeline to carry out gas extraction.
In the second step, a visual monitor capable of monitoring pulse signals of shock waves and crack derivative expansion in real time is arranged in the drill hole; and step six, monitoring pulse signals of the detected shock waves and microseismic information of crack derived expansion in real time through a visual monitor.
Further preferably, in the seventh step, the number of electric pulse discharges is 3 to 5.
It is further preferable that the hollow drill rod adopts double drill rods and can realize multi-section butt joint, each section of drill rod comprises an inner drill rod, an outer drill rod, a nut and a spiral ring, the inner drill rod and the outer drill rod are nested together to form an inner channel and an outer channel, the inner drill rod adopts a spiral drill rod, the spiral structure is combined with the outer channel for removing slag, and the inner channel is used for injecting water; the inner part and the outer part of the lower end of the inner drill rod are provided with threads for realizing the butt joint of the drill rods; the inner part of the upper end and the outer part of the lower end of the outer drill rod are internally and externally provided with threads, so that the inner drill rod and the outer drill rod are nested, and the hole wall can be protected from being damaged in the drilling process; the outer surface of the outer drill rod is provided with a row of grooves for placing and fixing cables, and the cables are restrained by fastening the screw rings and the outer threads at the lower end of the outer drill rod; the number of nuts on each section of drill rod is at least two, threads are arranged inside and outside the nuts, the nuts are used for nesting connection of the inner drill rod and the outer drill rod, the nuts are fixedly connected through middle spiral blades, and the hollow parts among the blades of the spiral blades are used for removing scraps. The hollow drill rod is not limited by the distance, a plurality of drill rods can be butted according to the length required by the present place, long-distance drilling is realized, and the hollow drill rod is flexible and changeable; the drill rod is simple in structure, strong in stability and convenient to assemble; not only is favorable for slag discharge, but also the hole wall can be protected from damage; the inner drill rod and the outer drill rod are detachable, are of hollow structures, can be used for injecting water, can be used for selecting whether to detach the inner drill rod according to the water consumption of the present place, and can increase the unit water injection rate of the outer drill rod if the water consumption is large; the outside of the drill rod is provided with a column of grooves which can be used for placing and fixing cables so as to conveniently convey discharge electrodes into holes, and in addition, the inside of the drill rod is of a hollow structure, and a pressure sensor can be installed in the drill rod according to the requirement. The whole anti-reflection process can complete drilling, hydraulic slotting, high-pressure hydraulic fracturing and high-pressure electric pulse by using the same hollow drill rod, so that the cost is greatly saved, and the method is simple and efficient.
It is further preferred that the outer diameter of the upper and lower ends of the outer drill rod is larger than the outer diameter at the intermediate position.
It is further preferred that the drill bit and the slotting machine are detachably and coaxially mounted on the front end of the hollow drill rod, and that the drill bit is located below the slotting machine.
It is further preferred that the number of nuts on each section of drill rod is two, and the nuts are respectively positioned at two ends of the drill rod.
It is further preferable that the high-voltage charging power supply, the capacitor, the high-voltage discharging switch, and the controller are integrated on the all-terrain mobile platform.
It is further preferred that a charging protection device is also provided on the all terrain mobile platform.
The invention has the beneficial effects that: according to the invention, the directional cracks of the coal body are prefabricated through the hydraulic cutting, then the directional cracks generated by the hydraulic cutting are subjected to fracturing by utilizing a high-pressure hydraulic fracturing technology, so that new cracks are generated on the directional cracks generated by the hydraulic cutting, and then the directional cracks generated by the hydraulic cutting and the new cracks generated by the hydraulic fracturing are expanded and communicated through a hydraulic-electric effect by utilizing a high-pressure pulse system, so that the crack range is further directionally expanded, more complex crack networks are formed in a large range in a directional manner, the permeability of the coal seam is improved, a channel is provided for gas migration, the gas extraction efficiency is improved, and the coal and gas outburst risk is reduced.
The method utilizes the comprehensive means of hydraulic slotting, high-pressure hydraulic fracturing and high-pressure electric pulse to crack and enhance the permeability of the coal seam, so that the permeability of the coal seam is obviously improved, favorable conditions are provided for gas extraction, and a good foundation is provided for reducing the outburst risk of coal and gas.
Drawings
Figure 1 is a step diagram of the present invention.
Fig. 2 is a schematic diagram of the apparatus of the present invention.
FIG. 3 is a schematic view of a drill bit of the present invention.
Fig. 4 is a block diagram of a high voltage electrical pulse system.
Fig. 5 is a schematic diagram of a system device.
Fig. 6 is an exploded view of a single section of drill pipe.
Fig. 7 is a schematic view of a hollow drill rod after two sections are butted.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1-5, the directional large-range seam making, permeability-increasing and outburst-preventing method for the high-gas coal seam comprises the following steps:
step one, selecting a target coal seam, constructing a directional drilling hole 1 in the target coal seam by using a directional drilling machine 7, and cutting a plurality of slots 2 in the directional drilling hole 1 by using a slotting machine 20. Preferably, the drill bit 19 and the cutter 20 are removably coaxially mounted on the front end of the hollow drill rod 5, with the drill bit 19 being located below the cutter 20.
And step two, after the construction of the directional drilling hole 1 is completed, the hollow drilling rod 5 is withdrawn, the drill bit 19 and the slotting device 20 at the front end of the hollow drilling rod 5 are unscrewed, the discharge electrode 17 of the connecting cable 16 is arranged at the front end of the hollow drilling rod 5, and the discharge electrode 17 is sent into the directional drilling hole 1 through the hollow drilling rod 5. The middle part of the hollow drill rod 5 is provided with a pressure sensor 18, and the pressure sensor 18 is utilized to monitor and record the pressure change in the directional drilling hole 1 in real time.
And thirdly, sealing holes by using the hole packer 4, and then continuously injecting high-pressure water into the drill hole 1 through the hollow drill rod 5 by operating the control valve 9 to perform hydraulic fracturing. The rear end of the drilling machine 7 is connected with a high-pressure water injection pump 10 through a water pipe 8.
And step four, after hydraulic fracturing is completed, the computer 15 is used for remotely setting charging voltage and sending a charging command, the high-voltage charging power supply 14 starts to charge the capacitor 13, and when the voltage value reaches a preset voltage, the charging is stopped.
And fifthly, after the charging is finished, a computer 15 is used for sending a discharging command through an optical fiber, a high-voltage discharging switch 6 is used for communicating a capacitor 13 with a discharging electrode 17, and an electric pulse generating system is started remotely to finish 1-time discharging. The discharge electrode 17 discharges in water, and the electric energy is converted into mechanical energy, so that shock waves which propagate outwards in a spherical shape are formed and act on the coal body to generate new cracks, and meanwhile, the directional large-range cracks generated by hydraulic slotting and hydraulic fracturing are further expanded and extended.
Step six, after repeated electric pulse discharging operation for a plurality of times, the high-voltage discharging switch 6 is disconnected, and discharging is stopped; after the discharge is completed, the hollow drill rod 5 and the discharge electrode 17 are withdrawn. The number of electric pulse discharges is preferably 3 to 5.
And step seven, connecting a gas extraction pipeline to carry out gas extraction.
Preferably, in the second step, a visual monitor 3 capable of monitoring pulse signals of shock waves and crack derivative expansion in real time is arranged in the drill hole 1; in the sixth step, the pulse signal of the detected shock wave and the microseismic information of crack derived expansion are monitored in real time through the visual monitor 3.
As shown in fig. 6-7, the hollow drill rod 5 adopts a double drill rod and can realize multi-section butt joint. Each section of drill rod mainly comprises an inner drill rod 51, an outer drill rod 52, a nut 53 and a coil 54.
The inner drill rod 51 and the outer drill rod 52 are nested together to form an inner passage 55 and an outer passage 56. The inner drill rod 51 is a screw type drill rod, and the screw structure is combined with the outer channel 56 for removing slag and the inner channel 55 for injecting water.
The inner drill rod 51 is threaded both inside and outside the upper end and outside the lower end for achieving the butt joint of the drill rods. The inner part of the upper end and the inner part of the lower end of the outer drill rod 52 are internally and externally provided with threads for realizing the nesting of the inner drill rod 51 and the outer drill rod 52 and protecting the hole wall from being damaged in the drilling process.
The outer surface of the outer drill rod 52 is provided with a series of grooves 52a for placing and fixing the cable and restraining the cable by tightening the screw 54 with the external thread at the lower end of the outer drill rod 52. Preferably, the outer diameter of the upper and lower ends of the outer drill rod 52 is greater than the outer diameter at the intermediate location.
At least two nuts 53 are arranged on each section of drill rod, threads are arranged inside and outside the nuts 53 and used for nesting connection of the inner drill rod 51 and the outer drill rod 52, the inner drill rod and the outer drill rod 52 are fixedly connected through a middle spiral blade 53a, and the blades of the spiral blade 53a are hollowed out for removing scraps. Preferably, there are two nuts 53 on each section of drill pipe, one at each end of the drill pipe.
Preferably, as shown in fig. 4 and 5, the high-voltage charging power supply 14, the capacitor 13, the high-voltage discharging switch 6, and the controller 9 are integrated on the all-terrain mobile platform 11. A charging protection device 12 is also provided on the all terrain mobile platform.
The hydraulic slotting is a technology for cutting and stripping coal bodies by taking high-pressure water as a cutter, so that slots can be formed in coal seams, and the exposed area of the coal bodies is increased. The production of the seam slot of the coal body can effectively improve the permeability of the coal seam and provide favorable conditions for gas extraction.
Hydraulic fracturing is a technology for transferring or releasing surrounding rock stress and energy by injecting high-pressure water into a stress concentration area through drilling, and the technology can increase pore water pressure of a coal rock body, reduce effective stress of the coal rock body and is beneficial to crack expansion of the coal rock body.
High voltage electrical pulse is a technique for converting electrical energy into mechanical energy using electrodes for high voltage high energy discharge, which is based on the principle of nuclear explosion shock waves. The high-voltage pulse high-power electric discharge device is used for carrying out high-power discharge on the coal bed, and the generated shock waves are used for carrying out fracturing and permeability improvement on the coal bed, so that the high-power electric discharge device has the advantages of high power, strong environment adaptability, environment friendliness and the like. The high-voltage pulse system adopts a remote control terminal, and parameter setting and monitoring are carried out on the system through a remote computer. The charging and discharging operation of the system can be completed by utilizing a computer to remotely send a command through an optical fiber, so that an operator is far away from the implementation site, and the safety of the operator of the equipment is further improved. The control module of the system can feed back the working state of the equipment to the remote computer while receiving the remote control command, thereby realizing the purpose of remotely monitoring the working condition of the equipment in real time.
The electrode material selected for the discharge electrode 17 is preferably a high-voltage-resistant corrosion-resistant high-strength alloy, and the electrode support body is made of stainless steel and a high-strength insulating material, so that the discharge electrode has long service life, corrosion resistance, impact resistance, easy maintenance and easy replacement. The voltage for starting the electric pulse generating system is 15kV, and the electric pulse generating frequency is 50Hz; the high-voltage discharge switch 6 adopts an independent switch passage, has higher discharge efficiency, strong environment adaptability, long discharge service life and good maintainability. The control of the high-voltage electric pulse charge and discharge is divided into a local control mode and a remote mode, and can receive a remote control command and send a device state signal to a remote computer. The hydraulic shock wave propagates outwards in a spherical shape, and the instantaneous shock wave pressure can reach tens to hundreds of megapascals, so that the electric energy is converted into mechanical energy. The drilling machine is used for drilling, the drilling direction can be directionally controlled, the construction period is short, and the working efficiency is high. The visual monitor 3 is adopted to monitor the pulse signal and the microseismic information of crack derived expansion in real time, and the pressure sensor 18 is adopted to monitor the pressure change in the hole in real time, so that the operation is simple and the safety is high. Water is directly injected into the drill hole through the hollow drill rod, a water injection pipeline is not required to be additionally paved in the drill hole, manual operation steps are reduced, and the method is simple and time-saving. The discharge electrode 17 is arranged at the front end of the hollow drill rod of the drilling machine, so that the drill rod is conveniently fed into a drilled hole, the manual operation difficulty is reduced, and the working efficiency is improved.
The invention adopts the remote control system to charge and discharge the capacitor, and simultaneously utilizes the computer to remotely monitor the running state of the equipment, so that the staff can be far away from the construction site, and the operation safety of the equipment is improved. According to the invention, by combining the hydraulic slotting, hydraulic fracturing and high-voltage electric pulse technology, the coal body is subjected to directional large-range slotting and permeability improvement, and on the basis of hydraulic slotting and hydraulic fracturing, a high-voltage electric pulse system is utilized to discharge in water, so that strong shock waves which are transmitted in a spherical shape are formed to act on the coal body, a large number of cracks are generated in the coal body, and original cracks are expanded and extended, so that the number of the cracks of the coal body can be effectively increased. In addition, the directional large-range cracks generated by hydraulic slotting and hydraulic fracturing are subjected to high-voltage pulse action, so that the directional expansion and penetration of a larger range are obtained again, the effective influence range of the directional cracks is further enlarged, the permeability of a coal bed is improved, the occurrence state of gas is changed, the desorption and migration of the gas are promoted, the gas extraction efficiency is improved, and the outburst risk of coal and gas is reduced.
Claims (9)
1. The directional large-range seam-making permeability-increasing outburst-preventing method for the high-gas coal seam is characterized by comprising the following steps of:
firstly, selecting a target coal seam, constructing a directional drilling hole (1) in the target coal seam by using a directional drilling machine (7), and cutting a plurality of slots (2) in the directional drilling hole (1) by using a slotting machine (20);
step two, after the construction of the directional drilling (1) is completed, withdrawing the hollow drill rod (5), unscrewing a drill bit (19) and a slotting device (20) at the front end of the hollow drill rod (5), arranging a discharge electrode (17) of a connecting cable (16) at the front end of the hollow drill rod (5), and sending the discharge electrode (17) into the directional drilling (1) through the hollow drill rod (5); the middle part of the hollow drill rod (5) is provided with a pressure sensor (18), and the pressure sensor (18) is used for monitoring and recording the pressure change in the directional drilling hole (1) in real time;
step three, hole sealing is carried out by using a hole packer (4), and then high-pressure water is continuously injected into the directional drilling hole (1) through a hollow drill rod (5) by operating a control valve (9) to carry out hydraulic fracturing;
after hydraulic fracturing is completed, remotely setting charging voltage by using a computer (15), sending a charging command, and starting to charge the capacitor (13) by the high-voltage charging power supply (14), and stopping charging when the voltage value reaches a preset voltage;
step five, after the charging is finished, a computer (15) is used for sending a discharging command through an optical fiber, a high-voltage discharging switch (6) is used for communicating a capacitor (13) and a discharging electrode (17), and an electric pulse generating system is started remotely to finish 1-time discharging; the discharge electrode (17) discharges in water, electric energy is converted into mechanical energy, a shock wave which propagates outwards in a spherical shape is formed and acts on a coal body to enable the coal body to generate new cracks, and meanwhile, the directional large-range cracks generated by hydraulic slotting and hydraulic fracturing are further expanded and extended;
step six, after repeated electric pulse discharging operation for a plurality of times, the high-voltage discharging switch (6) is disconnected to stop discharging; after the discharge is completed, the hollow drill rod (5) and the discharge electrode (17) are withdrawn;
and step seven, connecting a gas extraction pipeline to carry out gas extraction.
2. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 1, wherein the method comprises the following steps of: in the second step, a visual monitor (3) capable of monitoring pulse signals of shock waves and crack derivative expansion in real time is arranged in the directional drilling hole (1); in the sixth step, pulse signals of the detected shock waves and microseismic information of crack derived expansion are monitored in real time through a visual monitor (3).
3. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 1, wherein the method comprises the following steps of: in the sixth step, the electric pulse discharge times are 3-5 times.
4. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 1, wherein the method comprises the following steps of: the hollow drill rod (5) adopts double drill rods and can realize multi-section butt joint, each section of drill rod comprises an inner drill rod (51), an outer drill rod (52), a nut (53) and a spiral ring (54), the inner drill rod (51) and the outer drill rod (52) are nested together to form an inner channel (55) and an outer channel (56), the inner drill rod (51) adopts a spiral drill rod, the spiral structure is combined with the outer channel (56) to be used for removing slag, and the inner channel (55) is used for injecting water; the inner drill rod (51) is provided with threads at the inner part and the outer part of the lower end at the upper end and is used for realizing the butt joint of the drill rods; the inner part of the upper end and the inner part of the lower end of the outer drill rod (52) are internally and externally provided with threads, so that the inner drill rod (51) and the outer drill rod (52) are nested, and the hole wall can be protected from being damaged in the drilling process; the outer surface of the outer drill rod (52) is provided with a row of grooves (52 a) for placing and fixing cables, and the cables are restrained by fastening the screw ring (54) with the outer threads at the lower end of the outer drill rod (52); at least two nuts (53) are arranged on each section of drill rod, threads are arranged inside and outside the nuts (53) and used for nesting connection of the inner drill rod (51) and the outer drill rod (52) and are fixedly connected through middle spiral blades (53 a), and the blades of the spiral blades (53 a) are hollowed out for removing scraps.
5. The high gas coal seam directional large-scale seam making anti-reflection and outburst method according to claim 4, wherein the method comprises the following steps of: the outer diameter of the upper end and the lower end of the outer drill rod (52) is larger than that of the middle position.
6. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 4, wherein the method comprises the following steps of: the drill bit (19) and the slotting device (20) are detachably and coaxially arranged at the front end of the hollow drill rod (5), and the drill bit (19) is positioned below the slotting device (20).
7. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 4, wherein the method comprises the following steps of: the number of nuts (53) on each section of drill rod is two, and the nuts are respectively positioned at the two ends of the drill rod.
8. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 1, wherein the method comprises the following steps of: the high-voltage charging power supply (14), the capacitor (13), the high-voltage discharging switch (6) and the controller (9) are integrated on the all-terrain mobile platform (11).
9. The high gas coal seam directional large-scale seam making, permeability-increasing and outburst-preventing method according to claim 8, wherein the method comprises the following steps of: a charging protection device (12) is also provided on the all-terrain mobile platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310556887.1A CN116927860A (en) | 2023-05-17 | 2023-05-17 | Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310556887.1A CN116927860A (en) | 2023-05-17 | 2023-05-17 | Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116927860A true CN116927860A (en) | 2023-10-24 |
Family
ID=88390285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310556887.1A Pending CN116927860A (en) | 2023-05-17 | 2023-05-17 | Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116927860A (en) |
-
2023
- 2023-05-17 CN CN202310556887.1A patent/CN116927860A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2896335C (en) | Repetitive pulsed electric discharge apparatus for downhole formation evaluation | |
| CN219570089U (en) | Hydraulic fracturing system utilizing hollow drill rod | |
| CN109630020A (en) | Multichannel high-low pressure composite plasma boring method | |
| CN111396049B (en) | Safe and environment-friendly rock blasting device and method | |
| CN104912585B (en) | A kind of lossless liquid nitrogen system and method for administering coal-field fire | |
| WO2012094676A2 (en) | Apparatus and method for supplying electrical power to an electrocrushing drill | |
| CN109026097B (en) | Anti-floating anchor rod double-drill-bit hole forming construction method | |
| CN116556951A (en) | Comprehensive anti-impact method applicable to deep high-pressure coal rock stratum | |
| CN112096383B (en) | Gob-side roadway pulse roof cutting pressure relief method | |
| CN113565439A (en) | Device and method for monitoring high-voltage electric pulse energy and direction with controllable electrode angle | |
| CN116927860A (en) | Directional large-range seam-making anti-reflection and outburst prevention method for high-gas coal seam | |
| CN116557040A (en) | Coal seam anti-reflection and outburst prevention extraction method for high-voltage electric pulse cooperated hydraulic directional seam making | |
| CN214464159U (en) | Coal mine wall protection type drilling and phase change cracking device | |
| CN116557041A (en) | Remote control shock wave synergistic hydraulic large-range permeability-increasing coal seam extraction method | |
| CN116591684A (en) | Method for directional joint making and pressure relief of coal stratum scour prevention through cooperation of electric pulse waves and water power | |
| CN116717253A (en) | Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing | |
| CN219570090U (en) | High-voltage electric pulse system for deep coal seam | |
| CN219733306U (en) | Drill rod for deep coal rock mass | |
| CN115234237A (en) | Device for fracturing hard rock mass by underground electric pulse based on liquid-electricity effect | |
| CN112302081B (en) | Automatic equipment for digging rock foundation | |
| CN112709574B (en) | Outburst elimination method for outburst coal seam based on controllable shock wave anti-reflection | |
| CN111472779B (en) | Pre-splitting method for hard roof of coal seam | |
| CN113756803A (en) | Rock breaking method based on impact-resistant water-filled bag | |
| CN116677324A (en) | Drill rod suitable for deep coal rock mass | |
| CN113622936A (en) | Novel tunneling method and tunneling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |