CN111794682A - Passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device and using method thereof - Google Patents
Passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device and using method thereof Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 80
- 239000002817 coal dust Substances 0.000 title claims abstract description 70
- 230000035699 permeability Effects 0.000 title claims abstract description 31
- 238000001125 extrusion Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 230000003628 erosive effect Effects 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 230000036346 tooth eruption Effects 0.000 claims description 5
- 239000003818 cinder Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 on one hand Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005406 washing 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B43/006—Production of coal-bed methane
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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Abstract
The invention discloses a passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increase device and a use method, the device mainly comprises an anchor stirrer, a water tank, a slurry pump, a pressure gauge, a pipeline, a rotary water tail, a drilling machine, a drill rod, an integrated drill bit, a dust collection cover, a dust collection pipeline, a coal dust box, a filter screen and a jet pump, the device utilizes coal dust generated during drilling as an abrasive, the slurry pump is adopted to pressurize to form passive extrusion type pulse high-pressure coal dust to jet flow through a nozzle of the integrated drill bit to accelerate again and erode coal to break so as to relieve pressure and increase permeability, the coal dust is adopted as the abrasive, so that the device is convenient to use materials locally, can also reduce underground environmental pollution and save economic cost; in addition, the mud pump is adopted to generate the pulse jet with adjustable pulse frequency, so that the problem that the current pulse jet is difficult to apply to a field is solved, the water cushion effect can be effectively avoided, and the coal breaking efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of pressure relief and permeability increase of coal seams of coal mines and gas extraction, and particularly relates to a passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increase device and a using method thereof.
Background
Coal and gas outburst is the most serious dynamic disaster faced in coal mining, which seriously affects the normal production of coal mines, along with the year-by-year improvement of coal mining depth in recent years in China, gas exists in coal seams with the characteristics of high stress, high gas pressure and low permeability, the difficulty of coal mine resource mining is continuously increased, so the original coal seam pressure relief and permeability increase and gas extraction technology needs to be enhanced, the currently adopted coal seam pressure relief and permeability increase technology mainly comprises deep hole blasting, water jet cutting, hole expanding, hole building and other hydraulic measures, and the like, the gas extraction effect is enhanced by increasing the number of coal seam cracks, releasing coal seam stress and improving coal seam permeability, the pressure relief and permeability increase of the coal seam by adopting the stress waves generated during explosive blasting to perform pressure relief and permeability increase the number of the coal seam, but the explosive transportation and underground operation have great danger, the technology which is most widely used at present is hydraulic pressure relief and permeability increase, high-pressure water jet is adopted to perform slotting, hole expanding and cave forming on a coal seam so as to relieve the pressure of the coal seam and increase the permeability of the coal seam, the technology is developed relatively mature, but the high-pressure water jet has the problems of high pressure, shallow erosion depth and great potential safety hazard, and then technologies of high-pressure abrasive water jet and high-pressure pulse water jet pressure relief and permeability increase are correspondingly developed, the technologies overcome the problem of shallow erosion depth of the high-pressure water jet, the high-pressure abrasive water jet improves the rock breaking efficiency by utilizing the high-speed impact of abrasive particles, and can be divided into pre-mixing and post-mixing according to an abrasive mixing mode, the pre-mixing type abrasive is more fully mixed with the abrasive, the abrasive acceleration time is longer, the energy is higher, the rock impact breaking effect is more obvious, so the pre-mixing type abrasive water jet erosion effect is better under the same condition, however, no matter which mode is adopted, the trouble of the continuous feeding problem and the complexity of the equipment make the continuous feeding difficult to be applied in large scale under the well, in addition, the produced waste abrasive water and coal dust can cause water resource waste and pollute the underground environment, the high-pressure pulse water jet can effectively avoid the water cushion effect, the rock breaking efficiency is improved by utilizing the characteristics of the water hammer pressure effect, the high-frequency impact pressure, the high-speed lateral flow and the like, the high-pressure pulse water jet can be divided into an extrusion type, a cut-off type and an excitation type according to the pulse jet forming mechanism, the extrusion type pulse water jet is formed by impacting an extrusion piston and then extruding water to form high-speed jet with large diameter and intermittent emission, but the forming device is complex at present and difficult to be actually applied in the field, the cut-off type pulse jet is formed by high-speed rotating periodic continuous jet of an external perforated disc, the single pulse length and the pulse, the realization of the two kinds of pulse jet flow needs a complex exciting device, the exciting type pulse jet flow can form high-frequency pulse jet flow compared with the former two kinds of jet flow, but the pressure fluctuation amplitude is small, discontinuous emission can not be realized, and the capability of eroding and breaking hard rock is lower, so that no high-voltage pulse jet flow technology which can be applied to the field exists at present.
Disclosure of Invention
The invention aims to provide a passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device and a using method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a broken coal release anti-reflection device of passive extrusion formula pulse coal cinder efflux, includes the water tank, the high-pressure line that the slush pump of being connected with the water tank is connected with the slush pump export, the rig that is connected with the high-pressure line export, the rig includes the drilling rod, is located the integrated drill bit of drilling rod tip, integrated drill bit lower part is equipped with a coal cinder case, and coal cinder bottom of the case exit is equipped with a jet pump, and the jet pump export is UNICOM with the water tank.
Furthermore, a rotary water tail is arranged between the drilling machine and the high-pressure pipeline.
Furthermore, a dust collection cover which is inclined upwards is arranged at the contact position of the end part of the drill rod and the rock stratum, a dust collection pipeline is arranged at the bottom of the dust collection cover, an outlet of the dust collection pipeline is communicated with a coal dust box, and a filter screen is further arranged at the connection position of the bottom of the coal dust box and the jet pump.
Furthermore, a pressure gauge is further arranged on a high-pressure pipeline of the outlet of the slurry pump, and an anchor type stirrer is further arranged at the bottom of the water tank.
Further, the integrated drill bit comprises a shell, a plurality of cutting teeth are arranged at the front end of the shell, the integrated drill bit is located on a T-shaped valve core inside the shell, the right side of the T-shaped valve core is connected with the inside of the shell through an upper spring and a lower spring, the large end of the T-shaped valve core, namely the distance from the left side wall of the shell when the notch is plugged by forward movement of the valve core, is smaller than the distance of the compressed valve core, two nozzles are arranged on the shell, an inner channel of the valve core is arranged inside the valve core, a conical top cover is arranged at the front end of the valve core, a notch matched with the conical top cover is arranged at the joint of the conical top cover and the front end of the shell, a cutting tooth drainage channel is arranged between the notch and the front end of the shell, a.
Furthermore, a first gasket is arranged between the large end, namely the left end, of the valve core and the inner wall of the shell, and a second gasket is arranged between the small end, namely the right end, of the valve core and the inner wall of the shell.
A use method of a passive extrusion type pulse coal dust jet flow coal breaking pressure relief permeability increasing device comprises the following steps:
(1) adjusting the pressure of a slurry pump, drilling by using a drilling machine, stopping drilling until the depth of a designed hole is drilled, and withdrawing the drilling until the position needing to be eroded;
(2) cleaning a pipeline, a drill rod and a drill bit by using high-pressure water to prevent the system from being blocked, and opening a jet pump and an anchor stirrer after cleaning to form a coal dust aqueous solution which is uniformly mixed in a water tank;
(3) the water pressure of the slurry pump is adjusted to be more than 5MPa to open the nozzle channel, the pulse coal dust water jet pressure is controlled to be 30MPa, the pulse frequency is controlled to be 200Hz, the mass of the coal dust accounts for 13 percent, and the water supply flow is controlled to be 0.15m3Min, the formed high-pressure pulse coal dust water flow is accelerated to be sprayed out through a nozzle to erode the coal bed, the erosion depth is 1.5m, high-pressure pulse coal dust jet flow is formed in a drill hole along with the rotation of a drill bit to cut the coal body, pressure relief measures such as slotting, reaming, cave building and the like can be carried out on the coal bed according to needs in the process, the coal outlet condition of a drill hole opening is observed until no coal dust flows out of the hole opening, the same operation is carried out on the next position continuously, when the position is 2 m away from the drill hole opening, the work is stopped to prevent high-pressure water from hurting people, and a mud pump and a jet pump are closed after the erosion of the drill coal section;
(4) repeating the operation steps in the steps (1) to (2), carrying out the same operation on the next drill hole, and connecting the drill hole with a gas extraction system for extraction after the pressure relief and permeability increase work of the coal seam is finished
Further, when the water pressure in the step (1) is lower than 5MPa, the nozzle channel is closed, water flow only assists the cutting tooth to drill, in the process, the jet pump and the anchor type stirrer are closed, and the dust collection cover and the coal dust box are adopted to collect coal dust.
The invention has the advantages that:
1. the device adopts coal scraps in a drill hole as grinding materials, the coal scraps are pressurized by a slurry pump to form a passive extrusion type high-pressure pulse coal scrap water flow, and then the coal seam is eroded by an integrated drill bit so as to achieve the purpose of releasing pressure, increasing permeability and strengthening the gas extraction effect;
2. the coal scraps generated by drilling and coal erosion breaking operations are used as the grinding materials to erode and release the pressure of the coal bed, so that waste materials are changed into valuable materials, solid and liquid wastes generated by eroding the coal bed by jet flow are fully utilized, the underground environment pollution is reduced, the required grinding materials can be made from local materials conveniently and quickly according to local conditions, the gas treatment cost is further saved, and the economic pressure of enterprises is reduced;
3. the method for pressurizing the coal dust water by the mud pump not only can solve the problem of difficult continuous feeding at present, but also can simply and quickly form a continuous free-oscillation fluid structure which can exist without adding other excitation devices to form a passive extrusion type pulse jet with controllable pulse frequency, thereby solving the problem that the existing pulse jet generation method is difficult to apply to a coal mine site;
4. the active pulse coal dust water jet is adopted for slotting operation, so that the water cushion effect of continuous jet can be effectively avoided, and the coal breaking efficiency of the jet is improved by utilizing the water hammer pressure effect, high-frequency impact pressure, high-speed lateral flow and the impact action of high-speed coal dust particles;
5. compared with the mode of mixing coal dust and water before mixing, the mode of mixing the coal dust and the water before mixing the water and the coal dust is more sufficient and uniform, the acceleration process of coal dust particles is longer, the energy is higher, the impact crushing effect on coal rock mass is better, and in addition, the coal dust is used as an abrasive material, so that the abrasion on pipelines and drill rods can be effectively reduced due to the low hardness of the coal dust;
6. when the integrated drill bit is adopted for erosion coal-breaking operation, the drill bit does not need to be replaced after the drill rod is completely withdrawn, the coal bed can be subjected to water conservancy measures by adjusting the water pressure to start the nozzle to work and erode the coal bed, the pressure of the coal bed is relieved, the permeability is increased, the time is saved, the efficiency is improved, the abrasion of the drill rod is reduced, and the service life of the drill rod is prolonged.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a cross-sectional view of an integrated drill bit according to the present invention;
FIG. 3 is a top view of an integrated drill bit according to the present invention;
1: anchor agitator, 2: a water tank, 3: slurry pump, 4: pressure gauge, 5: high-pressure line, 6: rotating water tail, 7: a drilling machine, 8: drill rod, 9: dust cage, 10: integrated drill, 10.1: housing, 10.2: first gasket, 10.3: valve core, 10.4: spool internal passage, 10.5: nozzle, 10.6: spring, 10.7: pick, 10.8: second gasket, 10.9: pick drainage channel, 11: dust collecting pipe line, 12: rock formation, 13: coal seam, 14: coal dust box, 15: a filter screen and a 16-jet pump.
Detailed Description
As shown in the figure, the passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device comprises a water tank 2, a mud pump 3 connected with the water tank 2, a high-pressure pipeline 5 connected with the outlet of the mud pump 3, a drilling machine 7 connected with the outlet of the high-pressure pipeline 5, the drilling machine 7 comprises a drill rod 8 and an integrated drill bit 10 positioned at the end part of the drill rod 8, a coal dust box 14 is arranged at the lower part of the integrated drill bit 10, a jet pump 16 is arranged at the outlet at the bottom of the coal dust box 14, the outlet of the jet pump 16 is communicated with the water tank 2, a rotary water tail is also arranged between the drilling machine 7 and the high-pressure pipeline 5, a dust collection cover 9 which inclines upwards is also arranged at the contact part of the end part of the drill rod 8 and the rock stratum 12, the bottom of the dust collection cover 9 is provided with a dust collection pipeline 11, the outlet of the dust collection pipeline 11 is communicated with a coal dust box 14, and the joint of the bottom of the coal dust box 14 and a jet pump 16 is also provided with a filter screen 15; a pressure gauge 4 is further arranged on a high-pressure pipeline 5 at the outlet of the mud pump 3, an anchor type stirrer 1 is further arranged at the bottom of the water tank 2, the integrated drill 10 comprises a shell 10.1, a plurality of cutting teeth 10.7 are arranged at the front end of the shell 10.1, a T-shaped valve core 10.3 positioned in the shell 10.1 is connected with the inside of the shell 10.1 through an upper spring 10.6 and a lower spring 10.6, the distance from the left side wall of the shell 10.1 when the valve core 10.3 moves forwards to block the notch is smaller than the distance that the valve core 10.3 is compressed, two nozzles 10.5 are arranged on the shell 10.1, a valve core internal channel 10.4 is arranged in the valve core 10.3, a conical top cover is arranged at the front end of the valve core 10.3, a notch matched with the conical top cover is arranged at the joint of the conical top cover and the front end of the shell 10.1, a cutting tooth channel 10.9 is arranged between the notch and the front end of the shell 10.1, the cutting pick drainage channel 10.9 is provided with a plurality of outlets at the front end of the shell 10.1, each outlet is positioned at a cutting pick 10.7, a first gasket 10.2 is arranged between the large end, namely the left end, of the valve core 10.3 and the inner wall of the shell 10.1, and a second gasket 10.8 is arranged between the small end, namely the right end, of the valve core 10.3 and the inner wall of the shell 10.1.
When the jet pump 16 and the anchor type stirrer 1 are closed during drilling, the pressure of the slurry pump 3 is adjusted to ensure that the pressure of water flow flowing through the drill rod 8 is smaller (lower than 5 MPa), when the water pressure in the integrated drill bit 10 is smaller than the spring pressure energy, under the action of the spring 10.7, the first gasket 10.2 and the valve core 10.3 are tightly abutted against the closed nozzle 10.5 to ensure that the water flow can only enter the cutting tooth drainage channel 10.9 through the conical top cover at the front part of the valve core through the internal channel 10.4 of the valve core to flow to different cutting teeth, the auxiliary cutting tooth 10.7 breaks coal and rocks, the dust collection cover 9 is arranged at the outlet of the drill hole and is used for collecting coal dust generated in the drilling process of the drill hole, the coal dust enters the coal dust box 14 through the dust collection pipeline 11, the bottom of the coal dust box is provided with the filter screen 15 which is used for filtering out coal dust with different particle sizes from a coal dust water mixture, on one hand, coal scraps enter a water tank 2 in an accelerated manner through a jet pump 16, the coal scraps are fully stirred and uniformly mixed with water through an anchor stirrer 1, a slurry pump 3 pressurizes the coal scraps and enables a continuous free oscillation fluid structure to exist in a system without adding other exciting devices through the reciprocating motion of a piston of the slurry pump, a passive extrusion type pulse coal scraps water flow is formed, then the high-pressure pulse coal scraps water flow is conveyed to a rotary water tail 6 through a high-pressure pipeline 5 provided with a pressure gauge 4, the rotary water tail 6 is conveyed to an integrated drill bit 10 through a drilling machine 7 and a drill rod 8, the water pressure overcomes the elasticity of a spring 10.6 to push a valve core 10.3 to move forwards due to the fact that the water flow pressure is higher at the moment, a trapezoidal head at the front part of the valve core extends into a cutting pick drainage channel 10.9, a conical surface of the trapezoidal head is tightly abutted against a second gasket 10.8, the cutting pick drainage channel 10.9 is sealed, meanwhile, a nozzle 10.5 is opened, the, the included angle between the connecting line and the axial direction of the drill rod is 90 degrees, the diameter of the throat part is 3mm, and high-pressure pulse coal dust water flow is accelerated by the nozzle to form jet flow erosion coal seam pressure relief and permeability increase.
The device for carrying out erosion pressure relief on the coal seam comprises the following steps:
(1) adjusting the pressure of a slurry pump (when the water pressure is lower than 5MPa, a nozzle channel is closed, water flow only assists cutting teeth to drill), drilling by using a drilling machine, stopping drilling until the depth of a designed hole is drilled (in the process, a jet pump and an anchor type stirrer are closed, and a dust collection cover and a coal dust box are adopted to collect coal dust), and retreating the drilling to the position needing to be eroded;
(2) and the pipeline, the drill rod and the drill bit are cleaned by high-pressure water, so that the system is prevented from being blocked. After the washing is finished, opening the jet pump and the anchor type stirrer to form a coal dust water solution which is uniformly mixed in the water tank;
(3) adjusting slurry pump (when water pressure is more than 5MPa, the nozzle channel is opened, the pulse coal dust water jet pressure is controlled to be 30MPa, the pulse frequency is controlled to be 200Hz, the coal dust mass accounts for 13%, and the water supply flow is controlled to be 0.15m3The device has the best erosion effect in min, the erosion depth can reach 1.5 m), high-pressure pulse coal dust water flow formed is accelerated to be sprayed out through a nozzle to erode the coal bed, high-pressure pulse coal dust jet flow is formed in a drill hole along with the rotation of a drill bit to cut the coal body (in the process, the light pressure needs to be paid attention to slow rotation), pressure relief measures such as slotting, reaming, cave building and the like can be carried out on the coal bed according to needs in the process, the coal outlet condition of the drill hole opening is observed until no coal dust flows out from the hole opening, the same operation is carried out on the next position, when the position is 2 m away from the drill hole opening, the work is stopped to avoid hurting people by high pressure water, and a slurry pump and a jet pump are closed after the erosion of the;
(4) and (4) repeating the operation steps in the step (1) and (2), carrying out the same operation on the next drill hole, and connecting the drill hole with a gas extraction system for extraction after the pressure relief and permeability increase work of the coal seam is finished.
Claims (8)
1. The utility model provides a broken coal release anti-reflection device of passive extrusion formula pulse coal cinder efflux which characterized in that: the drilling machine comprises a drill rod and an integrated drill bit positioned at the end part of the drill rod, wherein a coal dust box is arranged at the lower part of the integrated drill bit, a jet pump is arranged at the outlet of the bottom of the coal dust box, and the outlet of the jet pump is communicated with the water tank.
2. The passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device of claim 1, wherein: and a rotary water tail is also arranged between the drilling machine and the high-pressure pipeline.
3. The passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device of claim 2, wherein: the drill rod is characterized in that a dust collection cover which is inclined upwards is further arranged at the contact position of the end part of the drill rod and the rock stratum, a dust collection pipeline is arranged at the bottom of the dust collection cover, an outlet of the dust collection pipeline is communicated with a coal dust box, and a filter screen is further arranged at the connection position of the bottom of the coal dust box and the jet pump.
4. The passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device of claim 3, wherein: the high-pressure pipeline of the outlet of the slurry pump is also provided with a pressure gauge, and the bottom of the water tank is also provided with an anchor type stirrer.
5. The passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device of claim 4, wherein: the integrated drill bit comprises a shell, a plurality of cutting teeth are arranged at the front end of the shell, the integrated drill bit is located on a T-shaped valve core inside the shell, the right side of the T-shaped valve core is connected with the inside of the shell through an upper spring and a lower spring, the distance from the left side wall of the shell to the left side wall is smaller than the distance of the valve core compressed when the notch is plugged by the forward movement of the valve core, two nozzles are arranged on the shell, a valve core internal passage is arranged inside the valve core, a conical top cover is arranged at the front end of the valve core, a notch matched with the conical top cover is arranged at the joint of the conical top cover and the front end of the shell, a cutting tooth drainage passage is arranged between the notch and the front end of the shell, a plurality of outlets are arranged at the.
6. The passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device of claim 5, wherein: a first gasket is arranged between the large end, namely the left end, of the valve core and the inner wall of the shell, and a second gasket is arranged between the small end, namely the right end, of the valve core and the inner wall of the shell.
7. The use method of the passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device as claimed in claims 1-6, characterized by comprising the following steps:
(1) adjusting the pressure of a slurry pump, drilling by using a drilling machine, stopping drilling until the depth of a designed hole is drilled, and withdrawing the drilling until the position needing to be eroded;
(2) cleaning a pipeline, a drill rod and a drill bit by using high-pressure water to prevent the system from being blocked, and opening a jet pump and an anchor stirrer after cleaning to form a coal dust aqueous solution which is uniformly mixed in a water tank;
(3) the water pressure of the slurry pump is adjusted to be more than 5MPa to open the nozzle channel, the pulse coal dust water jet pressure is controlled to be 30MPa, the pulse frequency is controlled to be 200Hz, the mass of the coal dust accounts for 13 percent, and the water supply flow is controlled to be 0.15m3Min, the formed high-pressure pulse coal dust water flow is accelerated to be sprayed out through a nozzle to erode the coal bed, the erosion depth is 1.5m, high-pressure pulse coal dust jet flow is formed in a drill hole along with the rotation of a drill bit to cut the coal body, pressure relief measures such as slotting, reaming, cave building and the like can be carried out on the coal bed according to needs in the process, the coal outlet condition of a drill hole opening is observed until no coal dust flows out of the hole opening, the same operation is carried out on the next position continuously, when the position is 2 m away from the drill hole opening, the work is stopped to prevent high-pressure water from hurting people, and a mud pump and a jet pump are closed after the erosion of the drill coal section;
(4) and (3) repeating the operation steps in the steps (1) to (2), carrying out the same operation on the next drill hole, and connecting the drill hole with a gas extraction system for extraction after the pressure relief and permeability increase work of the coal seam is finished.
8. The use method of the passive extrusion type pulse coal dust jet flow coal breaking pressure relief and permeability increasing device as claimed in claim 7, wherein: and (2) in the step (1), when the water pressure is lower than 5MPa, the nozzle channel is closed, the water flow only assists the cutting tooth to drill, in the process, the jet pump and the anchor type stirrer are closed, and the dust collection cover and the coal dust box are adopted to collect the coal dust.
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| CN113187478A (en) * | 2021-04-20 | 2021-07-30 | 南通大学 | Two-stage air-entrapping proportion-adjustable gas-liquid mixing nozzle device and use method thereof |
| CN113243880A (en) * | 2021-06-08 | 2021-08-13 | 岱川医疗(深圳)有限责任公司 | Endoscope air-water supply system and endoscope |
| CN113431498A (en) * | 2021-07-21 | 2021-09-24 | 辽宁工程技术大学 | Pulse gas coal breaking and reaming device |
| CN113931608A (en) * | 2021-10-13 | 2022-01-14 | 中煤科工集团重庆研究院有限公司 | Rear-mounted binary channels abrasive material efflux slotting device |
| CN114233290A (en) * | 2021-12-17 | 2022-03-25 | 河南理工大学 | Coal breaking, pressure relief and permeability increasing device and method for hydrodynamic flexible cutter |
| CN114351528A (en) * | 2021-12-01 | 2022-04-15 | 北京中煤矿山工程有限公司 | High-pressure slurry jet hole cutting and frost heaving reduction construction method |
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| CN113187478A (en) * | 2021-04-20 | 2021-07-30 | 南通大学 | Two-stage air-entrapping proportion-adjustable gas-liquid mixing nozzle device and use method thereof |
| CN113243880A (en) * | 2021-06-08 | 2021-08-13 | 岱川医疗(深圳)有限责任公司 | Endoscope air-water supply system and endoscope |
| CN113431498A (en) * | 2021-07-21 | 2021-09-24 | 辽宁工程技术大学 | Pulse gas coal breaking and reaming device |
| CN113931608A (en) * | 2021-10-13 | 2022-01-14 | 中煤科工集团重庆研究院有限公司 | Rear-mounted binary channels abrasive material efflux slotting device |
| CN114351528A (en) * | 2021-12-01 | 2022-04-15 | 北京中煤矿山工程有限公司 | High-pressure slurry jet hole cutting and frost heaving reduction construction method |
| CN114233290A (en) * | 2021-12-17 | 2022-03-25 | 河南理工大学 | Coal breaking, pressure relief and permeability increasing device and method for hydrodynamic flexible cutter |
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