CN113790080B - Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method - Google Patents
Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method Download PDFInfo
- Publication number
- CN113790080B CN113790080B CN202111180499.5A CN202111180499A CN113790080B CN 113790080 B CN113790080 B CN 113790080B CN 202111180499 A CN202111180499 A CN 202111180499A CN 113790080 B CN113790080 B CN 113790080B
- Authority
- CN
- China
- Prior art keywords
- gas
- explosion
- hole
- mixed gas
- blasting
- 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.)
- Active
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 70
- 238000005422 blasting Methods 0.000 title claims abstract description 47
- 238000002347 injection Methods 0.000 title claims abstract description 34
- 239000007924 injection Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003245 coal Substances 0.000 title claims description 36
- 238000003795 desorption Methods 0.000 title claims description 9
- 238000004880 explosion Methods 0.000 claims abstract description 153
- 238000007789 sealing Methods 0.000 claims abstract description 87
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000203 mixture Substances 0.000 claims abstract description 52
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 27
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000003860 storage Methods 0.000 claims description 35
- 238000002156 mixing Methods 0.000 claims description 26
- 239000007921 spray Substances 0.000 claims description 23
- 238000005553 drilling Methods 0.000 claims description 19
- 238000004080 punching Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 9
- 230000002708 enhancing effect Effects 0.000 claims description 8
- 238000010892 electric spark Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 239000012466 permeate Substances 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The device comprises a PDC drill bit, a drill rod, a helical blade and a blasting anti-reflection plug; the drill bit and the plugs are positioned at two ends of the drill rod, and a hole sealing bag is arranged at the outer side of each plug; the spiral blade is arranged on the surface of the drill rod; a plurality of blasting controllers are arranged on the drill rod; the out-hole assembly comprises a combustion and explosion mixed gas supply mechanism and an intelligent ignition control cabinet; the explosion controller is externally connected with an explosion mixed gas input pipe and an explosion ignition lead, and the explosion mixed gas input pipe and the explosion ignition lead pass through the explosion anti-reflection plug in a sealing way and then are connected with a control cabinet connected with an explosion mixed gas supply mechanism. The method comprises the following steps: after the parallel holes are drilled by using the in-hole assembly, the in-hole assembly is reserved in the drilled holes and is sealed; preparing a blasting mixture, and injecting the blasting mixture into a drill hole through a blasting mixture input pipe and a blasting controller; starting an explosion controller to ignite after gas injection is finished, and detonating the mixed gas to manufacture cracks by utilizing explosion impact; and removing the components in the holes, installing a gas extraction pipe and a carbon dioxide gas injection pipe, and performing gas extraction.
Description
Technical Field
The invention belongs to the technical field of coal rock permeability-increasing gas extraction, and particularly relates to a device and a method for enhancing gas extraction by combining low-permeability and difficult-desorption coal seam blasting and gas injection.
Background
At present, along with the continuous increase of energy demand, the coal mining depth is also continuously increased, deep coal and rock are in a high ground stress environment for a long time, the permeability is generally low, the gas extraction difficulty is increased under the deep mining condition, and the problem of gas outburst becomes an important factor for restricting the mine production safety.
Conventional gas extraction technologies comprise hydraulic fracturing technology, pressure relief extraction technology, deep space blasting technology and the like, and the gas extraction technologies have the defects of large engineering quantity, low efficiency, poor safety and great influence on the environment.
In addition, when conventional coal and rock permeability-increasing gas extraction is performed, the conventional operation mode is to drill holes first, then remove drilling equipment, then perform coal and rock permeability-increasing, and finally perform conventional gas extraction, but when facing a low-permeability and difficult-to-desorb coal seam, the gas extraction effect is not ideal.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method for enhancing gas extraction by combining low-permeability and difficult-desorption coal seam blasting and gas injection, which can quickly start blasting and permeability improvement without removing drilling equipment after drilling, and can complete gas extraction by utilizing a carbon dioxide displacement perfection mode after coal rock permeability improvement. The invention can effectively increase the crack development degree of the low-permeability and difficult-to-desorb coal seam, further enhance the gas extraction effect and effectively reduce the gas outburst and the gas explosion risk.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a low-permeability and difficult-to-desorb coal seam blasting and gas injection combined enhanced gas extraction device comprises an in-hole assembly and an out-hole assembly; the hole assembly comprises a PDC drill bit, a drill rod, a helical blade and a blasting anti-reflection plug; the PDC drill bit is arranged at the bottom end of the drill rod, and the explosion anti-reflection plug is arranged at the top end of the drill rod and is positioned at a drilling hole opening; an inflatable hole sealing bag is sleeved outside the explosion anti-reflection plug; the spiral blade is arranged on the surface of the rod body of the drill rod; a plurality of explosion controllers are arranged on the surface of a rod body of the drill rod, and each explosion controller is externally connected with an explosion mixed gas input pipe and an explosion ignition wire; the component outside the hole comprises a combustion-explosion mixed gas supply mechanism and an intelligent ignition control cabinet, and a combustion-explosion mixed gas control valve group is arranged in the intelligent ignition control cabinet; the explosion ignition lead passes through the explosion anti-reflection plug in a sealing way and is connected with the intelligent ignition control cabinet; the explosion gas mixture input pipe passes through the explosion anti-reflection plug in a sealing way and is connected with the gas outlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, and the gas inlet end of the explosion gas mixture control valve bank is connected with the explosion gas mixture supply mechanism.
The explosion controllers are positioned at the middle of two adjacent spiral blades, a 90-degree phase angle is arranged between the two adjacent explosion controllers, and all the explosion controllers are spatially distributed in a spiral state on the drill rod body.
The explosion controller comprises an ignition electrode, an explosion mixed gas spray hole, a spray hole sealing plate, a sealing plate supporting guide rod, a sealing plate supporting guide hole, a sealing plate reset spring, a spring positioning plate and a three-way pipe; the drill rod body is provided with an ignition electrode mounting hole, and the ignition electrode is positioned in the ignition electrode mounting hole; the number of the gas spraying holes of the blasting mixture is two and the gas spraying holes are symmetrically distributed on two sides of the ignition electrode; the sealing plate support guide rod is positioned in the sealing plate support guide hole, and one end of the sealing plate support guide rod is fixedly connected with the sealing plate of the gas spraying hole; the sealing plate return spring is positioned in the sealing plate supporting guide hole, the other end of the sealing plate supporting guide rod is fixedly connected with one end of the sealing plate return spring, and the other end of the sealing plate return spring is fixedly connected with the drill rod body through the spring positioning plate; the inlet sides of the two explosion mixed gas spray holes are communicated with an explosion mixed gas input pipe through a three-way pipe; the ignition electrode is connected with a blasting ignition lead.
The gas explosion mixed gas supply mechanism comprises a gas storage tank, a gas air mixing tank, a gas explosion mixed gas storage tank and a booster pump; the gas outlet of the gas storage tank is communicated with the gas inlet of the gas-air mixing tank, and a pipeline between the gas outlet of the gas storage tank and the gas inlet of the gas-air mixing tank is provided with a first stop valve; the air inlet of the gas-air mixing tank is communicated with a dry air supply source, and a pipeline between the air inlet of the gas-air mixing tank and the dry air supply source is provided with a second stop valve; the mixed gas outlet of the gas-air mixing tank is communicated with the gas inlet of the blasting mixed gas storage tank, and a third stop valve is arranged on a pipeline between the mixed gas outlet and the gas inlet of the blasting mixed gas storage tank; the gas outlet of the blasting gas mixture storage tank is communicated with the gas inlet of the booster pump, and a fourth stop valve is arranged on a pipeline between the gas outlet of the blasting gas mixture storage tank and the gas inlet of the booster pump; the gas outlet of the booster pump is communicated with the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, a fifth stop valve and a one-way valve are sequentially arranged on a pipeline between the gas outlet of the booster pump and the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, and the gas outlet of the one-way valve is communicated with the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet.
The method for enhancing gas extraction by combining low-permeability and difficult-to-desorb coal seam blasting and gas injection adopts the device for enhancing gas extraction by combining low-permeability and difficult-to-desorb coal seam blasting and gas injection, and comprises the following steps:
step one: selecting a gas extraction area of a coal bed, calibrating a punching position in the selected area, adopting a parallel punching method, completing punching operation of a drilled hole by an in-hole assembly consisting of a PDC drill bit, a drill rod, a helical blade and a blasting anti-reflection plug, after the punching is finished, reserving the in-hole assembly in the drilled hole, and then completing hole sealing of the drilled hole by inflating the in-hole sealing bag;
step two: opening a first stop valve, injecting gas into the gas-air mixing tank through a gas storage tank, simultaneously opening a second stop valve, injecting dry air into the gas-air mixing tank through a dry air supply source until the gas concentration of the gas-air mixing tank reaches a set value, forming a fuel explosion mixed gas, and then closing the first stop valve and the second stop valve;
step three: opening a third stop valve, injecting the mixed explosion mixed gas into an explosion mixed gas storage tank until the explosion mixed gas is full of the explosion mixed gas storage tank, and then closing the third stop valve;
step four: opening a fourth stop valve, a fifth stop valve and an explosion mixed gas control valve bank in the intelligent ignition control cabinet, starting a booster pump at the same time, injecting the explosion mixed gas in an explosion mixed gas storage tank into an explosion mixed gas spray hole of an explosion controller through an explosion mixed gas input pipe, under the action of pressure difference, pushing a sealing plate of the spray hole open to enable a sealing plate reset spring to be in an elongation state, continuously filling high-pressure explosion mixed gas into a drill hole, and when the pressure difference between the explosion mixed gas spray hole and the drill hole is reduced to be insufficient to overcome the spring force of the sealing plate reset spring, closing the spray hole sealing plate again under the action of the spring force of the sealing plate reset spring, closing the booster pump at the moment, and closing the fourth stop valve, the fifth stop valve and the explosion mixed gas control valve bank in the intelligent ignition control cabinet at the same time;
step five: the ignition electrode is controlled to generate electric sparks through the intelligent ignition control cabinet, the explosion mixed gas in the drilling holes is detonated by the electric sparks, cracks are generated in the coal bed around the drilling holes under the action of explosion impact, and adjacent drilling holes are communicated through the cracks;
step six: removing the drilled holes from the components in the holes, alternately inserting a gas extraction pipe and a carbon dioxide gas injection pipe into a plurality of drilled holes, installing gas extraction plugs at all the holes of the drilled holes, enabling the gas extraction pipe and the carbon dioxide gas injection pipe to pass through the gas extraction plugs in a sealing manner, sleeving an inflatable hole sealing bag outside the gas extraction plugs, and inflating the gas extraction bags to complete hole sealing of the drilled holes;
step seven: the method comprises the steps of connecting a gas extraction pipe to negative pressure gas extraction equipment in a mine, connecting a carbon dioxide gas injection pipe to carbon dioxide gas supply equipment in the mine, starting the negative pressure gas extraction equipment and the carbon dioxide gas supply equipment, injecting carbon dioxide gas into corresponding holes through the carbon dioxide gas injection pipe, enabling the carbon dioxide gas to enter surrounding cracks for displacing gas in a coal layer, enabling the displaced gas to enter the holes for gas extraction through the cracks, and finally discharging the displaced gas through the gas extraction pipe to realize gas extraction.
The invention has the beneficial effects that:
according to the device and the method for enhancing gas extraction by combining low permeability and difficult desorption coal seam blasting and gas injection, after drilling is completed, the blasting and permeability improvement can be quickly started without removing drilling equipment, and after the coal rock permeability improvement is finished, gas extraction is completed by means of carbon dioxide displacement perfection. The invention can effectively increase the crack development degree of the low-permeability and difficult-to-desorb coal seam, further enhance the gas extraction effect and effectively reduce the gas outburst and the gas explosion risk.
Drawings
FIG. 1 is a schematic diagram of a low permeability and difficult desorption coal seam blasting and gas injection combined enhanced gas extraction device;
FIG. 2 is a schematic diagram of the structure of the explosion controller of the present invention;
FIG. 3 is a schematic diagram of gas extraction;
in the figure, 1-PDC drill bit, 2-drill rod, 3-helical blade, 4-explosion permeability-increasing plug, 5-drill hole, 6-inflatable hole sealing bag, 7-explosion controller, 8-explosion mixed gas input pipe, 9-explosion ignition lead, 10-intelligent ignition control cabinet, 11-ignition electrode, 12-explosion mixed gas injection hole, 13-injection hole sealing plate, 14-sealing plate supporting guide rod, 15-sealing plate supporting guide hole, 16-sealing plate return spring, 17-spring positioning plate, 18-three-way pipe, 19-gas storage tank, 20-gas air mixing tank, 21-explosion mixed gas storage tank, 22-booster pump, 23-first stop valve, 24-second stop valve, 25-third stop valve, 26-fourth stop valve, 27-fifth stop valve, 28-one-way valve, 29-coal bed, 30-gas extraction pipe, 31-carbon dioxide gas injection pipe and 32-gas extraction plug.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1 and 2, the low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device comprises an in-hole component and an out-hole component; the hole assembly comprises a PDC drill bit 1, a drill rod 2, a helical blade 3 and a blasting anti-reflection plug 4; the PDC drill bit 1 is arranged at the bottom end of the drill rod 2, and the explosion anti-reflection plug 4 is arranged at the top end of the drill rod 2 and is positioned at the orifice of the drill hole 5; an inflatable hole sealing bag 6 is sleeved outside the explosion anti-reflection plug 4; the helical blade 3 is arranged on the surface of the rod body of the drill rod 2; a plurality of explosion controllers 7 are arranged on the surface of the rod body of the drill rod 2, and each explosion controller 7 is externally connected with an explosion mixed gas input pipe 8 and an explosion ignition lead 9; the outside-hole assembly comprises a combustion and explosion mixed gas supply mechanism and an intelligent ignition control cabinet 10, and a combustion and explosion mixed gas control valve group is further arranged in the intelligent ignition control cabinet 10; the explosion ignition lead 9 passes through the explosion anti-reflection plug 4 in a sealing way and is connected with the intelligent ignition control cabinet 10; the explosion gas mixture input pipe 8 passes through the explosion anti-reflection plug 4 in a sealing way and is connected with the gas outlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet 10, and the gas inlet end of the explosion gas mixture control valve bank is connected with the explosion gas mixture supply mechanism.
The explosion controllers 7 are positioned in the middle of two adjacent spiral blades 3, a 90-degree phase angle is formed between the two adjacent explosion controllers 7, and all the explosion controllers 7 are distributed in a spiral state space on the rod body of the drill rod 2.
The explosion controller 7 comprises an ignition electrode 11, an explosion mixed gas spray hole 12, a spray hole sealing plate 13, a sealing plate supporting guide rod 14, a sealing plate supporting guide hole 15, a sealing plate return spring 16, a spring positioning plate 17 and a three-way pipe 18; an ignition electrode mounting hole is formed in the rod body of the drill rod 2, and the ignition electrode 11 is positioned in the ignition electrode mounting hole; the number of the gas explosion mixture gas spray holes 12 is two and the gas explosion mixture gas spray holes are symmetrically distributed on two sides of the ignition electrode 11; the sealing plate support guide holes 15 are positioned at the outer sides of the blasting mixture gas spray holes 12, the gas spray hole sealing plates 13 are positioned at the outlet sides of the blasting mixture gas spray holes 12, the sealing plate support guide rods 14 are positioned in the sealing plate support guide holes 15, and one ends of the sealing plate support guide rods 14 are fixedly connected with the gas spray hole sealing plates 13; the sealing plate return spring 16 is positioned in the sealing plate supporting guide hole 15, the other end of the sealing plate supporting guide rod 14 is fixedly connected with one end of the sealing plate return spring 16, and the other end of the sealing plate return spring 16 is fixedly connected with the rod body of the drill rod 2 through the spring positioning plate 17; the inlet sides of the two explosion mixture gas spray holes 12 are communicated with the explosion mixture gas input pipe 8 through a three-way pipe 18; the ignition electrode 11 is connected to the explosion ignition wire 9.
The gas explosion mixed gas supply mechanism comprises a gas storage tank 19, a gas air mixing tank 20, a gas explosion mixed gas storage tank 21 and a booster pump 22; the gas outlet of the gas storage tank 19 is communicated with the gas inlet of the gas-air mixing tank 20, and a pipeline between the gas outlet and the gas inlet is provided with a first stop valve 23; the air inlet of the gas-air mixing tank 20 is communicated with a dry air supply source, and a pipeline between the air inlet and the dry air supply source is provided with a second stop valve 24; the mixed gas outlet of the gas-air mixing tank 20 is communicated with the gas inlet of the blasting mixed gas storage tank 21, and a third stop valve 25 is arranged on a pipeline between the mixed gas outlet and the gas inlet; the gas outlet of the blasting mixture storage tank 21 is communicated with the gas inlet of the booster pump 22, and a fourth stop valve 26 is arranged on a pipeline between the gas outlet and the gas inlet of the booster pump 22; the gas outlet of the booster pump 22 is communicated with the gas inlet end of the gas explosion mixture control valve bank in the intelligent ignition control cabinet 10, a fifth stop valve 27 and a one-way valve 28 are sequentially arranged on a pipeline between the gas outlet of the booster pump 22 and the gas inlet end of the gas explosion mixture control valve bank in the intelligent ignition control cabinet 10, and the gas outlet of the one-way valve 28 is communicated with the gas inlet end of the gas explosion mixture control valve bank.
The method for enhancing gas extraction by combining low-permeability and difficult-to-desorb coal seam blasting and gas injection adopts the device for enhancing gas extraction by combining low-permeability and difficult-to-desorb coal seam blasting and gas injection, and comprises the following steps:
step one: selecting a gas extraction area of a coal seam 29, calibrating a punching position in the selected area, adopting a parallel punching method, completing punching operation of a drill hole 5 by an in-hole assembly consisting of a PDC drill bit 1, a drill rod 2, a helical blade 3 and a blasting anti-reflection plug 4, after punching is finished, retaining the in-hole assembly in the drill hole 5, and then completing hole sealing of the drill hole 5 by inflating the inflatable hole sealing bag 6;
step two: opening a first stop valve 23, injecting gas into the gas-air mixing tank 20 through the gas storage tank 19, simultaneously opening a second stop valve 24, injecting dry air into the gas-air mixing tank 20 through a dry air supply source until the gas concentration of the gas-air mixing tank 20 reaches a set value, forming a fuel explosion mixed gas, and then closing the first stop valve 23 and the second stop valve 24; in the embodiment, the gas concentration in the gas explosion mixture is set to 9-10%;
step three: opening a third stop valve 25, injecting the mixed explosion mixture into the explosion mixture storage tank 21 until the explosion mixture is filled in the explosion mixture storage tank 21, and then closing the third stop valve 25;
step four: the fourth stop valve 26, the fifth stop valve 27 and the explosion gas mixture control valve group in the intelligent ignition control cabinet 10 are opened, the booster pump 22 is started at the same time, the explosion gas mixture in the explosion gas mixture storage tank 21 is injected into the explosion gas mixture gas hole 12 of the explosion controller 7 through the explosion gas mixture input pipe 8, under the action of pressure difference, the gas hole sealing plate 13 is jacked up, the sealing plate reset spring 16 is in an elongation state, high-pressure explosion gas mixture is continuously filled into the drill hole 5, when the pressure difference between the explosion gas mixture gas hole 12 and the drill hole 5 is reduced to be insufficient to overcome the spring force of the sealing plate reset spring 16, the gas hole sealing plate 13 is closed again under the action of the spring force of the sealing plate reset spring 16, the booster pump 22 is closed at the moment, and the fourth stop valve 26, the fifth stop valve 27 and the explosion gas mixture control valve group in the intelligent ignition control cabinet 10 are closed at the same time; in the present embodiment, the booster pump 22 controls the gas injection pressure of the gas mixture of the combustion and explosion at 10MPa;
step five: the ignition electrode 11 is controlled to generate electric sparks through the intelligent ignition control cabinet 10, the explosion mixture in the drilling holes 5 is detonated by the electric sparks, the coal seam 29 around the drilling holes 5 generates cracks under the action of explosion impact, and the adjacent drilling holes 5 are communicated through the cracks;
step six: removing the drilled holes 5 from the components in the holes, alternately inserting a gas extraction pipe 30 and a carbon dioxide gas injection pipe 31 into a plurality of drilled holes 5, and installing gas extraction plugs 32 at the openings of all the drilled holes 5, wherein the gas extraction pipe 30 and the carbon dioxide gas injection pipe 31 are sealed and penetrate through the gas extraction plugs 32, and an inflatable hole sealing bag 6 is sleeved outside the gas extraction plugs 32, and hole sealing of the drilled holes 5 is completed by inflating the inflatable hole sealing bag 6, as shown in fig. 3;
step seven: the gas extraction pipe 30 is connected to negative pressure gas extraction equipment in a mine, meanwhile, the carbon dioxide injection pipe 31 is connected to carbon dioxide gas supply equipment in the mine, then the negative pressure gas extraction equipment and the carbon dioxide gas supply equipment are started, carbon dioxide gas is firstly injected into the corresponding drilling holes 5 through the carbon dioxide injection pipe 31, then enters the surrounding cracks from the drilling holes 5 to be used for displacing gas in the coal seam 29, the displaced gas enters the drilling holes 5 for gas extraction through the cracks, and finally is discharged through the gas extraction pipe 30, so that gas extraction is realized.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.
Claims (4)
1. The utility model provides a low indisposition coal seam blasting and gas injection combination reinforcing gas drainage device that permeates easily which characterized in that: comprises an in-hole component and an out-hole component; the hole assembly comprises a PDC drill bit, a drill rod, a helical blade and a blasting anti-reflection plug; the PDC drill bit is arranged at the bottom end of the drill rod, and the explosion anti-reflection plug is arranged at the top end of the drill rod and is positioned at a drilling hole opening; an inflatable hole sealing bag is sleeved outside the explosion anti-reflection plug; the spiral blade is arranged on the surface of the rod body of the drill rod; a plurality of explosion controllers are arranged on the surface of a rod body of the drill rod, and each explosion controller is externally connected with an explosion mixed gas input pipe and an explosion ignition wire; the component outside the hole comprises a combustion-explosion mixed gas supply mechanism and an intelligent ignition control cabinet, and a combustion-explosion mixed gas control valve group is arranged in the intelligent ignition control cabinet; the explosion ignition lead passes through the explosion anti-reflection plug in a sealing way and is connected with the intelligent ignition control cabinet; the explosion gas mixture input pipe passes through the explosion anti-reflection plug in a sealing way and is connected with the gas outlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, and the gas inlet end of the explosion gas mixture control valve bank is connected with the explosion gas mixture supply mechanism; the explosion controller comprises an ignition electrode, an explosion mixed gas spray hole, a spray hole sealing plate, a sealing plate supporting guide rod, a sealing plate supporting guide hole, a sealing plate reset spring, a spring positioning plate and a three-way pipe; the drill rod body is provided with an ignition electrode mounting hole, and the ignition electrode is positioned in the ignition electrode mounting hole; the number of the gas spraying holes of the blasting mixture is two and the gas spraying holes are symmetrically distributed on two sides of the ignition electrode; the sealing plate support guide rod is positioned in the sealing plate support guide hole, and one end of the sealing plate support guide rod is fixedly connected with the sealing plate of the gas spraying hole; the sealing plate return spring is positioned in the sealing plate supporting guide hole, the other end of the sealing plate supporting guide rod is fixedly connected with one end of the sealing plate return spring, and the other end of the sealing plate return spring is fixedly connected with the drill rod body through the spring positioning plate; the inlet sides of the two explosion mixed gas spray holes are communicated with an explosion mixed gas input pipe through a three-way pipe; the ignition electrode is connected with a blasting ignition lead.
2. The low permeability and difficult desorption coal seam blasting and gas injection combined enhanced gas extraction device according to claim 1, wherein the device is characterized in that: the explosion controllers are positioned at the middle of two adjacent spiral blades, a 90-degree phase angle is arranged between the two adjacent explosion controllers, and all the explosion controllers are spatially distributed in a spiral state on the drill rod body.
3. The low permeability and difficult desorption coal seam blasting and gas injection combined enhanced gas extraction device according to claim 2, wherein the device is characterized in that: the gas explosion mixed gas supply mechanism comprises a gas storage tank, a gas air mixing tank, a gas explosion mixed gas storage tank and a booster pump; the gas outlet of the gas storage tank is communicated with the gas inlet of the gas-air mixing tank, and a pipeline between the gas outlet of the gas storage tank and the gas inlet of the gas-air mixing tank is provided with a first stop valve; the air inlet of the gas-air mixing tank is communicated with a dry air supply source, and a pipeline between the air inlet of the gas-air mixing tank and the dry air supply source is provided with a second stop valve; the mixed gas outlet of the gas-air mixing tank is communicated with the gas inlet of the blasting mixed gas storage tank, and a third stop valve is arranged on a pipeline between the mixed gas outlet and the gas inlet of the blasting mixed gas storage tank; the gas outlet of the blasting gas mixture storage tank is communicated with the gas inlet of the booster pump, and a fourth stop valve is arranged on a pipeline between the gas outlet of the blasting gas mixture storage tank and the gas inlet of the booster pump; the gas outlet of the booster pump is communicated with the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, a fifth stop valve and a one-way valve are sequentially arranged on a pipeline between the gas outlet of the booster pump and the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet, and the gas outlet of the one-way valve is communicated with the gas inlet end of the explosion gas mixture control valve bank in the intelligent ignition control cabinet.
4. The method for enhancing gas extraction by combining low-permeability and difficult-to-desorb coal seam blasting and gas injection is characterized by comprising the following steps of:
step one: selecting a gas extraction area of a coal bed, calibrating a punching position in the selected area, adopting a parallel punching method, completing punching operation of a drilled hole by an in-hole assembly consisting of a PDC drill bit, a drill rod, a helical blade and a blasting anti-reflection plug, after the punching is finished, reserving the in-hole assembly in the drilled hole, and then completing hole sealing of the drilled hole by inflating the in-hole sealing bag;
step two: opening a first stop valve, injecting gas into the gas-air mixing tank through a gas storage tank, simultaneously opening a second stop valve, injecting dry air into the gas-air mixing tank through a dry air supply source until the gas concentration of the gas-air mixing tank reaches a set value, forming a fuel explosion mixed gas, and then closing the first stop valve and the second stop valve;
step three: opening a third stop valve, injecting the mixed explosion mixed gas into an explosion mixed gas storage tank until the explosion mixed gas is full of the explosion mixed gas storage tank, and then closing the third stop valve;
step four: opening a fourth stop valve, a fifth stop valve and an explosion mixed gas control valve bank in the intelligent ignition control cabinet, starting a booster pump at the same time, injecting the explosion mixed gas in an explosion mixed gas storage tank into an explosion mixed gas spray hole of an explosion controller through an explosion mixed gas input pipe, under the action of pressure difference, pushing a sealing plate of the spray hole open to enable a sealing plate reset spring to be in an elongation state, continuously filling high-pressure explosion mixed gas into a drill hole, and when the pressure difference between the explosion mixed gas spray hole and the drill hole is reduced to be insufficient to overcome the spring force of the sealing plate reset spring, closing the spray hole sealing plate again under the action of the spring force of the sealing plate reset spring, closing the booster pump at the moment, and closing the fourth stop valve, the fifth stop valve and the explosion mixed gas control valve bank in the intelligent ignition control cabinet at the same time;
step five: the ignition electrode is controlled to generate electric sparks through the intelligent ignition control cabinet, the explosion mixed gas in the drilling holes is detonated by the electric sparks, cracks are generated in the coal bed around the drilling holes under the action of explosion impact, and adjacent drilling holes are communicated through the cracks;
step six: removing the drilled holes from the components in the holes, alternately inserting a gas extraction pipe and a carbon dioxide gas injection pipe into a plurality of drilled holes, installing gas extraction plugs at all the holes of the drilled holes, enabling the gas extraction pipe and the carbon dioxide gas injection pipe to pass through the gas extraction plugs in a sealing manner, sleeving an inflatable hole sealing bag outside the gas extraction plugs, and inflating the gas extraction bags to complete hole sealing of the drilled holes;
step seven: the method comprises the steps of connecting a gas extraction pipe to negative pressure gas extraction equipment in a mine, connecting a carbon dioxide gas injection pipe to carbon dioxide gas supply equipment in the mine, starting the negative pressure gas extraction equipment and the carbon dioxide gas supply equipment, injecting carbon dioxide gas into corresponding holes through the carbon dioxide gas injection pipe, enabling the carbon dioxide gas to enter surrounding cracks for displacing gas in a coal layer, enabling the displaced gas to enter the holes for gas extraction through the cracks, and finally discharging the displaced gas through the gas extraction pipe to realize gas extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111180499.5A CN113790080B (en) | 2021-10-11 | 2021-10-11 | Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111180499.5A CN113790080B (en) | 2021-10-11 | 2021-10-11 | Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113790080A CN113790080A (en) | 2021-12-14 |
| CN113790080B true CN113790080B (en) | 2023-12-05 |
Family
ID=79184952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111180499.5A Active CN113790080B (en) | 2021-10-11 | 2021-10-11 | Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113790080B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114382456B (en) * | 2022-02-25 | 2022-11-08 | 中国矿业大学(北京) | Gas production promoting device and method for deflagration permeability-increasing coal seam |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612746A (en) * | 2015-01-12 | 2015-05-13 | 中国矿业大学 | Cutting-exploding coupled coal anti-reflection method in drilled hole |
| WO2019242190A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Multi-stage combustion shock wave-induced cracked coal body and heat injection alternating reinforced gas extraction method |
| WO2019242191A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method |
| CN112761586A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Drilling methane self-circulation blasting fracturing enhanced extraction method |
| CN213510566U (en) * | 2020-11-23 | 2021-06-22 | 山西煤炭进出口集团左云韩家洼煤业有限公司 | Coal mine gas extraction deep hole presplitting blasting permeability-increasing structure |
| CN113002649A (en) * | 2021-03-31 | 2021-06-22 | 哈尔滨工业大学 | Frog-simulated jumping robot based on combustion and explosion driving and method |
-
2021
- 2021-10-11 CN CN202111180499.5A patent/CN113790080B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612746A (en) * | 2015-01-12 | 2015-05-13 | 中国矿业大学 | Cutting-exploding coupled coal anti-reflection method in drilled hole |
| WO2019242190A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Multi-stage combustion shock wave-induced cracked coal body and heat injection alternating reinforced gas extraction method |
| WO2019242191A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method |
| CN213510566U (en) * | 2020-11-23 | 2021-06-22 | 山西煤炭进出口集团左云韩家洼煤业有限公司 | Coal mine gas extraction deep hole presplitting blasting permeability-increasing structure |
| CN112761586A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Drilling methane self-circulation blasting fracturing enhanced extraction method |
| CN113002649A (en) * | 2021-03-31 | 2021-06-22 | 哈尔滨工业大学 | Frog-simulated jumping robot based on combustion and explosion driving and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113790080A (en) | 2021-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2731428C1 (en) | Method of gas production by alternate use of multi-stage cracking of coal massif during combustion with formation of shock wave and heat-carrier injection | |
| CN103982168B (en) | Underground multi-stage intelligent high pressure gas pulse formation fracturing device and method thereof | |
| CN113294134B (en) | Hydraulic fracturing and methane in-situ blasting synergistic fracturing permeability-increasing method | |
| RU2735711C1 (en) | Method of extracting gas by loosening a coal bed by combining hydraulic cutting of grooves and combustion shock wave acting in several steps | |
| US20150125210A1 (en) | Excavated underground caverns for fluid storage | |
| CN103244096B (en) | The closed pulse of coal gas layer loads the device and method of pressure break loosely stress | |
| CN112922577B (en) | Shale reservoir multi-level radial horizontal well methane combustion and explosion fracturing method | |
| CN113738435B (en) | Enhanced anti-reflection extraction method for deep low-permeability high-gas coal seam area | |
| CN101813002A (en) | Coal seam pre-splitting method based on gas extraction | |
| CN112832728B (en) | Shale reservoir fracturing method based on methane multistage combustion and explosion | |
| CN102168543B (en) | Method and apparatus of improving recovery efficiency of shale gas through a blast mode | |
| CN103352684B (en) | Chemical Physics compound explosion fracturing equipment and manufacture method thereof | |
| CN113790080B (en) | Low-permeability and difficult-desorption coal seam blasting and gas injection combined enhanced gas extraction device and method | |
| CN101737028A (en) | Coalbed methane high-power pulse fracturing developing device | |
| CN203362135U (en) | Perforating device improving gas permeability of coal beds | |
| CN114412433A (en) | Deep coal in-situ fluidization mining method based on heat extraction power generation | |
| CN115539130A (en) | Enhanced coal bed gas exploitation and CO of non-recoverable coal bed 2 Method for sealing | |
| CN102052066B (en) | Dynamic seal pressing method and device for improving complex perforation pressing crack effect | |
| CN108166962A (en) | A kind of communication method of fire flood air injection well and oil recovery producing well | |
| CN2866810Y (en) | Multi-pulse over-positive pressure perforating device | |
| CN115522905B (en) | Methane explosion fracturing device for shale gas reservoir and control method thereof | |
| CN208168859U (en) | The device in the electric pulse collaboration anti-reflection coal seam of frozen-thawed | |
| CN116658140A (en) | Method for extracting methane from coal seam by hot flue gas displacement blasting fracturing and closed-loop carbon fixation | |
| WO2016065478A1 (en) | Dynamic loading and thermal fracturing of hydrocarbon formations | |
| CN203050664U (en) | Two-phase flow gas dynamic impact plug removal technical tubular column |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |