CN116717253A - Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing - Google Patents
Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing Download PDFInfo
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- CN116717253A CN116717253A CN202310556892.2A CN202310556892A CN116717253A CN 116717253 A CN116717253 A CN 116717253A CN 202310556892 A CN202310556892 A CN 202310556892A CN 116717253 A CN116717253 A CN 116717253A
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- 239000003245 coal Substances 0.000 title claims abstract description 84
- 239000011435 rock Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000035939 shock Effects 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 6
- 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 20
- 238000012544 monitoring process Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 10
- 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
- 239000013307 optical fiber Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000005070 sampling Methods 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
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/18—Other methods or devices for dislodging with or without loading by electricity
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a coal and rock anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing, which comprises the steps of firstly, detecting and recording stress concentration degree of a target coal seam or rock stratum; step two, constructing a drilling hole; step three, 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 four, hole sealing is carried out by using a hole packer, and hydraulic fracturing is carried out; step five to step seven, finish repeating the electric pulse discharge operation many times; and step eight, testing the pressure relief effect of the coal bed or rock stratum of the technology. The method applies a drilling cutting method, high-pressure hydraulic fracturing and high-pressure electric pulse to carry out large-scale fracturing and pressure relief on the coal rock stratum, changes the stress state of the coal rock stratum, reduces the stress concentration degree, achieves the purpose of preventing impact, and is mainly applied to deep coal rock mass tunneling tunnels and stoping working faces containing the coal rock mass impact tendency.
Description
Technical Field
The invention relates to the technical field of safe and efficient mining of coal strata, in particular to a coal strata anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing, which can effectively reduce the rock burst risk of the coal strata.
Background
The rock burst coal mine in China accounts for 3.78% of the total number of the coal mines in China, the productivity of the rock burst coal mine accounts for 8.99% of the total productivity of the coal mines in China, and the risk of the rock burst seriously threatens the safety production of the coal mines. The rock burst is a dynamic phenomenon that the elastic strain energy accumulated in the coal body or the rock body is suddenly released under a certain condition due to the overhigh stress concentration degree, so that the coal or the rock body is subjected to rapid brittle failure and is thrown out to a mining space.
In recent years, as the mining depth of a mine is increased, the mining environment and geological conditions of the mine are progressively worse, and the rock burst problem is progressively severe due to the high concentration of the stress of the mine in the deep part. In the coal mining process, accumulated energy in the coal body cannot be released slowly in time, so that ore vibration is frequent. When the elastic potential energy accumulated in the coal or rock mass is suddenly released, the coal or rock mass is instantaneously damaged to induce rock burst, so that not only is the coal mining efficiency influenced, but also casualties and equipment damage are caused, and huge economic loss and bad social influence are brought. Therefore, it is very necessary and unprecedented to control rock burst mines at present.
The impact tendency of the coal body is an inherent cause of rock burst, and is essentially that the coal body has accumulated deformation energy, high stress concentration degree and impact damage. According to the method for classifying the impact tendencies of coal and measuring the indexes, laboratory tests are carried out through on-site sampling, and when the uniaxial compressive strength of the coal sample is measured to be more than 7MPa, the elastic energy index and the impact energy index are respectively more than 2 and 1.5, and the dynamic destruction time is more than 50ms, the coal seam can be comprehensively judged to have the impact tendencies of coal bodies. However, at present, the comprehensive anti-impact method for deep high-pressure coal strata mainly combines a drilling cutting method with a stress on-line monitoring system, so that the method is single in means and the anti-impact effect is not ideal.
Disclosure of Invention
The invention aims to provide a coal rock anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing, which changes the stress state of a coal seam and reduces the stress concentration degree, thereby achieving the purpose of high-efficiency and rapid anti-impact.
The technical scheme adopted by the invention is as follows: a coal rock anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing comprises the following steps:
firstly, selecting a target coal seam or rock stratum, detecting the stress concentration degree of the target coal seam or rock stratum by using a drilling cuttings method combined stress on-line monitoring system, and recording the drilling cuttings quantity and the stress value at the moment;
step two, constructing a drilling hole in a target coal seam or rock stratum by using a drilling machine;
step three, after the drilling construction is completed, withdrawing the hollow drill rod, unscrewing a drill bit at the front end of 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 the drilling hole 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 drill hole in real time;
step four, hole sealing is carried out by using a hole packer, and then high-pressure water is continuously injected into a drilled hole through a hollow drill rod by operating a control valve to carry out hydraulic fracturing;
step five, 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 six, 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 or a rock body to enable the coal body or the rock body to generate new cracks, and meanwhile, a large-range crack generated by hydraulic fracturing is further expanded and extended;
step seven, after repeated electric pulse discharging operation for a plurality of times, the high-voltage discharging switch is disconnected, and discharging is stopped; after the discharge is completed, the hollow drill rod and the discharge electrode are withdrawn;
and step eight, detecting the stress concentration degree of the target coal bed or rock stratum after electric pulse discharge by utilizing a drilling cuttings method combined stress on-line monitoring system, comparing the drilling cuttings quantity and the stress value before electric pulse discharge, and detecting the pressure relief effect of the coal bed or rock stratum of the technology.
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 6 to 8.
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 drilling, high-pressure hydraulic fracturing and high-pressure electric pulse can be completed by using the same hollow drill rod in the whole anti-flushing process, so that the cost is greatly saved, and the method is simple and efficient.
It is further preferable that the outer diameter of the upper and lower ends of the outer drill rod is larger than the outer diameter of the middle position, and the grooves are formed at the positions of the two ends.
It is further preferred that the drill bit is removably coaxially mounted to the front end of the hollow drill shaft.
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 coal rock mass is firstly fractured by utilizing a high-pressure hydraulic fracturing technology, so that a large-range fracture is generated around a drilling hole, and then the large-range fracture is expanded and penetrated by utilizing a high-pressure electric pulse system through a hydro-electric effect, so that the range of the fracture is further expanded, the large-range fracture forms a more complex fracture network, the stress state of a coal bed can be effectively changed, the stress concentration degree of the coal bed is reduced, and the aim of releasing the pressure of the coal bed is fulfilled.
The method adopts the comprehensive means of drilling cutting method, high-pressure hydraulic fracturing and high-pressure electric pulse to crack and relieve pressure of the coal stratum, changes the stress state of the coal stratum, reduces the stress concentration degree, achieves the purpose of preventing impact, and is mainly applied to deep coal rock tunneling tunnels and stoping working faces containing the impact tendency of the coal rock.
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, a coal rock anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing comprises the following steps:
selecting a target coal bed or rock stratum, detecting the stress concentration degree of the target coal bed or rock stratum by using a drilling cuttings method combined stress on-line monitoring system, and recording the drilling cuttings amount and the stress value at the moment.
And secondly, constructing a drilling hole 1 in the target coal seam or rock stratum by using a drilling machine 7. The drill bit 2 is detachably and coaxially mounted at the front end of the hollow drill rod 5.
And thirdly, after the construction of the drill hole 1 is completed, withdrawing the hollow drill rod 5, unscrewing the drill bit 2 at the front end of the hollow drill rod 5, arranging the discharge electrode 17 of the connecting cable 16 at the front end of the hollow drill rod 5, and sending the discharge electrode 17 into the drill hole 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 drill hole 1 in real time.
And fourthly, 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 fifthly, 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 step six, after the charging is finished, a computer 15 sends 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 electrical energy is converted into mechanical energy, forming a shock wave that propagates outwards in a spherical shape, acting on the coal or rock mass to create new fissures, and at the same time further expanding and elongating the extensive fissures created by the hydraulic fracturing.
Step seven, 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 eight, detecting the stress concentration degree of the target coal bed or rock stratum after electric pulse discharge by utilizing a drilling cuttings method combined stress on-line monitoring system, comparing the drilling cuttings quantity and the stress value before electric pulse discharge, and detecting the pressure relief effect of the coal bed or rock stratum of the technology.
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.
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 disclosed by the invention is used for carrying out high-power discharge on the coal bed or the rock stratum, and the generated shock wave is used for fracturing the coal bed or the rock stratum, 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, the hydraulic fracturing and the high-voltage pulse technology are combined to perform large-range seam making and pressure relief on the coal body, the high-voltage pulse system is utilized to discharge in water on the basis of hydraulic fracturing, so that strong shock waves which are propagated in a spherical shape are formed to act on the coal body or rock body, a large number of cracks are generated in the coal body or rock body, and original cracks are expanded and extended, so that the number of cracks of the coal body or rock body can be effectively increased, the stress state of a coal layer or rock layer is changed, the stress concentration degree is reduced, and the aim of pressure relief of the coal layer or rock layer is fulfilled. In addition, the large-range cracks generated by hydraulic fracturing are subjected to high-voltage pulse action to obtain larger-range directional expansion and penetration, so that the effective influence range of the large-range cracks is enlarged, the stress concentration degree of a coal bed or a rock stratum is obviously reduced, and a good foundation is provided for preventing rock burst.
Claims (9)
1. A coal rock anti-impact method for large-scale seam making by remote controllable shock wave and hydraulic fracturing is characterized by comprising the following steps:
firstly, selecting a target coal seam or rock stratum, detecting the stress concentration degree of the target coal seam or rock stratum by using a drilling cuttings method combined stress on-line monitoring system, and recording the drilling cuttings quantity and the stress value at the moment;
step two, constructing a drilling hole (1) in a target coal seam or rock stratum by using a drilling machine (7);
step three, after the construction of the drill hole (1) is completed, withdrawing the hollow drill rod (5), unscrewing a drill bit (2) 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 feeding the discharge electrode (17) into the drill hole (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 drill hole (1) in real time;
step four, hole sealing is carried out by using a hole packer (4), and then high-pressure water is continuously injected into a drill hole (1) through a hollow drill rod (5) by operating a control valve (9) to carry out hydraulic fracturing;
step five, 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 a high-voltage charging power supply (14), and stopping charging when the voltage value reaches a preset voltage;
step six, 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, electric energy is converted into mechanical energy, and shock waves which are transmitted outwards in a spherical shape are formed and act on a coal body or a rock body to enable the coal body or the rock body to generate new cracks, and meanwhile, large-range cracks generated by hydraulic fracturing are further expanded and extended;
step seven, 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 eight, detecting the stress concentration degree of the target coal bed or rock stratum after electric pulse discharge by utilizing a drilling cuttings method combined stress on-line monitoring system, comparing the drilling cuttings quantity and the stress value before electric pulse discharge, and detecting the pressure relief effect of the coal bed or rock stratum of the technology.
2. The coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making according to claim 1, wherein the method comprises the following steps of: step two, a visual monitor (3) capable of monitoring pulse signals of shock waves and crack derivative expansion in real time is arranged in the 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 coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making according to claim 1, wherein the method comprises the following steps of: in the seventh step, the discharge times of the electric pulse are 6-8 times.
4. The coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making 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 coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing wide-range joint making according to claim 4, wherein the method comprises the following steps of: the outer diameters of the upper end and the lower end of the outer drill rod (52) are larger than the outer diameter of the middle position, and the grooves (52 a) are formed in the positions of the two ends.
6. The coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making according to claim 4, wherein the method comprises the following steps of: the drill bit (2) is detachably and coaxially arranged at the front end of the hollow drill rod (5).
7. The coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making 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 coal rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing large-scale joint making 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 coal and rock scour protection method for remotely controllable shockwave-assisted hydraulic fracturing wide-range joint making 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 |
|---|---|---|---|
| CN202310556892.2A CN116717253A (en) | 2023-05-17 | 2023-05-17 | Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310556892.2A CN116717253A (en) | 2023-05-17 | 2023-05-17 | Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116717253A true CN116717253A (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310556892.2A Pending CN116717253A (en) | 2023-05-17 | 2023-05-17 | Coal and rock anti-impact method for large-range seam making by remote controllable shock wave and hydraulic fracturing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116717253A (en) |
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2023
- 2023-05-17 CN CN202310556892.2A patent/CN116717253A/en active Pending
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