CN109611057B - Carbon dioxide fracturing and permeability increasing device for coal bed gas extraction - Google Patents
Carbon dioxide fracturing and permeability increasing device for coal bed gas extraction Download PDFInfo
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- CN109611057B CN109611057B CN201811629241.7A CN201811629241A CN109611057B CN 109611057 B CN109611057 B CN 109611057B CN 201811629241 A CN201811629241 A CN 201811629241A CN 109611057 B CN109611057 B CN 109611057B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 66
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 66
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 230000001965 increasing effect Effects 0.000 title claims abstract description 31
- 230000035699 permeability Effects 0.000 title claims abstract description 29
- 238000000605 extraction Methods 0.000 title description 13
- 239000007788 liquid Substances 0.000 claims abstract description 188
- 238000005474 detonation Methods 0.000 claims abstract description 75
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 20
- 230000008018 melting Effects 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005219 brazing Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 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
- E21B43/006—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
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
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Abstract
The invention discloses a carbon dioxide fracturing and permeability increasing device for extracting coal bed gas, wherein a detonation cavity is arranged between a detonation component and a permeability increasing liquid storage component, and molten liquid metal with a low melting point can be injected into the detonation cavity, so that liquid carbon dioxide in the permeability increasing liquid storage component is detonated by using energy released by the molten liquid metal with the low melting point, the detonation speed can be greatly improved, instant strong detonation expansion impact force is realized, and the permeability increasing effect is ensured; through the combined use of first liquid reserve pipe, second liquid reserve pipe and third liquid reserve pipe, can select to use several sections of liquid reserve pipes according to the degree of depth in coal seam to improve work efficiency. Through the combined use of the energy discharge head main body, the support frame, the spring, the sealing gasket and the air discharge and pressure release hole, carbon dioxide can be uniformly diffused into the coal bed, so that the fracturing and permeability increasing effect is better.
Description
Technical Field
The invention relates to the technical field of coal mine gas extraction, in particular to a carbon dioxide fracturing and permeability increasing device for coal bed gas extraction.
Background
A considerable number of coal beds in gas mines in China are low-permeability and difficult-to-pump coal beds, so that the gas drainage rate, the gas drainage quantity and the drainage concentration are very low. Therefore, how to change the air permeability of the coal seam and improve the gas drainage rate of the coal seam is always a difficult problem of gas comprehensive treatment. The carbon dioxide fracturing permeability-increasing technology is a new permeability-increasing technology for coal seams in coal mines, high-pressure carbon dioxide gas is quickly released by utilizing liquid carbon dioxide to be gasified and expanded by heating, the high-pressure carbon dioxide gas breaks the coal seams, cracks in the coal seams are increased, and further the permeability of the coal seams is increased. However, most of the existing anti-reflection devices adopt a heater to heat carbon dioxide on site and expand the carbon dioxide to achieve detonation treatment, the detonation treatment is slow in speed, the expansion force of the internal carbon dioxide during detonation is difficult to achieve large accumulation, and the energy released by detonation is limited greatly. And current structure is difficult to splice the liquid storage pipe according to the difference of coal seam degree of depth to reach the most suitable length, be difficult to make the even inside that spreads the coal seam of carbon dioxide, be difficult to carry out high temperature treatment to the inside liquid carbon dioxide of liquid storage pipe from the outside, make the inside liquid carbon dioxide of liquid storage pipe gasify rapidly, improve and explode the permeation force.
Therefore, the technical personnel in the field provide a carbon dioxide fracturing and permeability increasing device for extracting coal bed gas, so as to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a carbon dioxide fracturing and permeability increasing device for coal bed gas extraction, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a carbon dioxide fracturing and permeability increasing device for extracting coal bed gas comprises a liquid carbon dioxide filling assembly, a permeability increasing liquid storage assembly, an energy discharging head and a detonation assembly, wherein the permeability increasing liquid storage assembly extends into a drill hole in a coal bed;
the innermost end, located on the drill hole, of the anti-reflection liquid storage assembly is provided with the energy leakage head, and the energy leakage head can enable the carbon dioxide energy after detonation to be discharged from the energy leakage head; the detonation component is arranged on the outer periphery side of the anti-reflection liquid storage component and is characterized in that,
the anti-reflection liquid storage assembly is assembled together in a mode that a plurality of sections of liquid storage pipes are connected with one another, so that the length of the anti-reflection liquid storage assembly can be adjusted as required;
and a detonation cavity is arranged between the detonation component and the anti-reflection liquid storage component, and molten liquid metal with a low melting point can be injected into the detonation cavity so as to detonate liquid carbon dioxide in the anti-reflection liquid storage component by using energy released by the molten liquid metal with the low melting point.
As a further scheme of the invention: the detonation assembly comprises a detonation seat, an end cover disc and a heating assembly, wherein the detonation seat is sleeved at the detonation part outside the liquid storage pipe, a detonation cavity is formed between the inner wall of the detonation seat and the outer wall of the liquid storage pipe, the inner end part of the detonation seat adopts the end cover disc and the liquid storage pipe to be sealed, and the heating assembly is arranged in the detonation cavity.
As a further scheme of the invention: the liquid storage tube is installed, a groove is formed in the outer wall of the part, facing the groove, of the detonation seat, a protrusion is arranged on the detonation seat, the heating assembly is installed or wound on the protrusion, and the heating assembly is a heating coil or a heating electrode.
As a further scheme of the invention: the groove is spirally wound on the outer circumferential surface of the liquid storage pipe; or
The grooves include a plurality of circular grooves arranged at intervals on the outer circumferential surface of the liquid storage pipe.
As a further scheme of the invention: the low-melting-point molten liquid metal is one or more of metal tin, brazing filler metal and zinc.
As a further scheme of the invention: still retrieve the subassembly including the liquid metal of low melting point melting, the liquid metal of low melting point retrieves the subassembly including retrieving suction tube and gas blow pipe, wherein, retrieve suction tube and gas blow pipe and all stretch into detonate the intracavity, just the gas blow pipe is located retrieve the top of suction tube, and when retrieving, heating element is in heating operating condition, the gas blow pipe to it blows in steam to detonate the intracavity, retrieve the molten state low melting point metal that the suction tube will be under the low bit stream and retrieve.
As a further scheme of the invention: the anti-reflection liquid storage assembly at least comprises a first liquid storage pipe, a second liquid storage pipe and a third liquid storage pipe; the liquid carbon dioxide filling assembly comprises a liquid carbon dioxide storage tank, a connecting pipe and a valve;
the top of liquid carbon dioxide holding vessel is connected with the connecting pipe, the outside of connecting pipe is provided with the valve, and the one end of connecting pipe is pegged graft in the inside of first liquid reserve pipe, the bottom of first liquid reserve pipe is provided with the second liquid reserve pipe, the bottom of second liquid reserve pipe is provided with the third liquid reserve pipe, the bottom of third liquid reserve pipe is provided with the head of leaking energy, the inside in coal seam is arranged in to the head of leaking energy, the internally mounted of first liquid reserve pipe has the hole packer, and the outside of first liquid reserve pipe has cup jointed the subassembly that detonates.
As a further scheme of the invention: the first liquid storage pipe, the second liquid storage pipe and the third liquid storage pipe are the same in structure and are matched with each other; screw thread or welded connection between first liquid storage pipe and the second liquid storage pipe, screw thread or welded connection between second liquid storage pipe and the third liquid storage pipe, the third liquid storage pipe with let out can be connected between the head.
As a further scheme of the invention: the energy leakage head comprises an energy leakage head main body, a support frame, a spring, a sealing gasket and an exhaust pressure relief hole, the energy leakage head main body is arranged inside the energy leakage head, the support frame is erected on the top of the inner wall of the energy leakage head main body, the bottom end of the support frame is connected with the spring, the sealing gasket is connected below the spring, and the exhaust pressure relief hole is formed in the side face and the bottom end of the energy leakage head main body.
As a further scheme of the invention: the sealing gasket is a rubber component and is cylindrical.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the detonation cavity is arranged between the detonation component and the anti-reflection liquid storage component, and molten liquid metal with a low melting point can be injected into the detonation cavity, so that liquid carbon dioxide in the anti-reflection liquid storage component can be detonated by using energy released by the molten liquid metal with the low melting point, the detonation speed can be greatly increased, instant strong detonation expansion impact force is realized, and the anti-reflection effect is ensured;
2. through the combined use of first liquid reserve pipe, second liquid reserve pipe and third liquid reserve pipe, can select to use several sections of liquid reserve pipes according to the degree of depth in coal seam to improve work efficiency.
3. Through the combined use of the energy discharge head main body, the support frame, the spring, the sealing gasket and the air discharge and pressure release hole, carbon dioxide can be uniformly diffused into the coal bed, so that the fracturing and permeability increasing effect is better.
4. Through setting up heating element and molten metal, can follow the outside and carry out high temperature treatment to the inside liquid carbon dioxide of first liquid storage pipe, second liquid storage pipe and third liquid storage pipe to make the inside liquid carbon dioxide of first liquid storage pipe, second liquid storage pipe and third liquid storage pipe gasify rapidly, can also realize the recovery reuse to molten metal.
Drawings
FIG. 1 is a schematic diagram of an internal structure of a carbon dioxide fracturing and permeability increasing device for coal bed gas extraction;
FIG. 2 is a schematic structural diagram of a carbon dioxide fracturing and permeability increasing device for coal bed gas extraction;
FIG. 3 is a schematic view of an installation structure of a liquid storage pipe in a carbon dioxide fracturing permeability-increasing device for coal bed gas extraction;
FIG. 4 is a schematic structural diagram of an energy release head in a carbon dioxide fracturing permeability-increasing device for coal bed gas extraction;
FIG. 5 is a schematic structural diagram of a detonation assembly in a carbon dioxide fracturing permeability-increasing device for coal bed gas extraction
FIG. 6 is a schematic view of a mounting position of a detonation assembly in a carbon dioxide fracturing permeability-increasing device for coal bed gas extraction;
FIG. 7 is a schematic diagram of a second installation position of a detonation assembly in a carbon dioxide fracturing permeability-increasing device for coal bed gas extraction;
fig. 8 is a schematic diagram of a state of molten metal recovery in a carbon dioxide fracturing permeability increasing device for coal bed gas extraction.
Detailed Description
Referring to fig. 1 to 8, in the embodiment of the invention, a carbon dioxide fracturing and permeability increasing device for extracting coal bed gas comprises a liquid carbon dioxide filling assembly, a permeability increasing and liquid storing assembly, an energy discharging head 7 and a detonation assembly, wherein the permeability increasing and liquid storing assembly extends into a drill hole of a coal bed 10;
the energy leakage head 7 is arranged at the innermost end of the anti-reflection liquid storage assembly, which is positioned in the drill hole, and the energy leakage head 7 can discharge the energy of the carbon dioxide after detonation from the energy leakage head 7; the detonation component is arranged on the outer periphery side of the anti-reflection liquid storage component and is characterized in that,
the anti-reflection liquid storage assembly is assembled together in a mode that a plurality of sections of liquid storage pipes are connected with one another, so that the length of the anti-reflection liquid storage assembly can be adjusted as required;
a detonation cavity 14 is arranged between the detonation component and the anti-reflection liquid storage component, and molten liquid metal with a low melting point can be injected into the detonation cavity 14, so that liquid carbon dioxide in the anti-reflection liquid storage component can be detonated by using energy released by the molten liquid metal with the low melting point.
In this embodiment, the detonation assembly includes a detonation seat 16, an end cover disc 13 and a heating assembly, wherein the detonation seat 16 is sleeved on the detonation portion outside the liquid storage tube, an detonation cavity 18 is formed between an inner wall of the detonation seat 16 and an outer wall of the liquid storage tube, an inner end portion of the detonation seat 16 is sealed with the liquid storage tube by the end cover disc 13, and the heating assembly is disposed in the detonation cavity 18.
In a preferred embodiment, a groove 14 is formed in the outer wall of the part of the liquid storage tube where the detonation seat is installed, a protrusion 15 is formed on the detonation seat 16 opposite to the groove, the heating assembly is installed or wound on the protrusion 15, and the heating assembly 9 is a heating coil or a heating electrode.
Wherein, the groove 14 is spirally wound on the outer circumferential surface of the liquid storage tube; or the groove 14 comprises a plurality of circular ring-shaped grooves which are arranged on the outer circumferential surface of the liquid storage pipe at intervals.
In a preferred embodiment, the low-melting-point molten liquid metal is one or more of metal tin, brazing filler metal and zinc.
In addition, the invention also comprises a low-melting-point molten liquid metal recovery assembly, wherein the low-melting-point molten liquid metal recovery assembly comprises a recovery suction pipe 12 and an air blowing pipe 17, the recovery suction pipe 12 and the air blowing pipe 17 both extend into the detonation chamber 18, the air blowing pipe 17 is positioned above the recovery suction pipe 12, when in recovery, the heating assembly is in a heating working state, the air blowing pipe blows hot air into the detonation chamber 18, and the recovery suction pipe 12 recovers molten low-melting-point metal under a low flow.
The anti-reflection liquid storage assembly at least comprises a first liquid storage pipe 4, a second liquid storage pipe 5 and a third liquid storage pipe 6; the liquid carbon dioxide filling assembly comprises a liquid carbon dioxide storage tank 1, a connecting pipe 2 and a valve 3; the top of liquid carbon dioxide holding vessel 1 is connected with connecting pipe 2, the outside of connecting pipe 2 is provided with valve 3, and the one end of connecting pipe 2 is pegged graft in the inside of first liquid reserve pipe 4, the bottom of first liquid reserve pipe 4 is provided with second liquid reserve pipe 5, the bottom of second liquid reserve pipe 5 is provided with third liquid reserve pipe 6, the bottom of third liquid reserve pipe 6 is provided with the head 7 that can let out, let out can the head 7 and arrange the inside of coal seam 10 in, the internally mounted of first liquid reserve pipe 4 has hole packer 8, and the outside of first liquid reserve pipe 4 has cup jointed detonation component 9.
In addition, the first liquid storage pipe 4, the second liquid storage pipe 5 and the third liquid storage pipe 6 have the same structure, and the first liquid storage pipe 4, the second liquid storage pipe 5 and the third liquid storage pipe 6 are matched for use; screw thread or welded connection between first liquid storage pipe 4 and the second liquid storage pipe 5, screw thread or welded connection between second liquid storage pipe 5 and the third liquid storage pipe 6, third liquid storage pipe 6 and the head of letting out can be connected between 7, through the combined use of first liquid storage pipe 4, second liquid storage pipe 5 and third liquid storage pipe 6, can select several sections of liquid storage pipes of use according to the degree of depth of coal seam 10 to improve work efficiency.
The head 7 of letting out can be provided with the head main part 71 of letting out can including letting out the head main part 71 of can, support frame 72, spring 73, sealed 74 and exhaust pressure release hole 75 of packing, the inside of the head 7 of letting out can be provided with the head main part 71 of letting out, the support frame 72 has been erect on the inner wall top of the head main part 71 of letting out can, the bottom of support frame 72 is connected with spring 73, the below of spring 73 is connected with sealed 74 of packing, the exhaust pressure release hole 75 has all been seted up to the side and the bottom of the head main part 71 of letting out can, through the combined use of the head main part 71 of letting out can, support frame 72, spring 73, sealed 74 of packing and exhaust pressure release hole 75, can make the inside of the even diffusion coal. The gasket 74 is made of rubber, and the gasket 74 has a cylindrical shape.
The working principle of the invention is as follows: firstly, the staff opens the valve 3 and fills the liquid carbon dioxide into the first liquid storage pipe 4, the second liquid storage pipe 5 and the third liquid storage pipe 6, after the liquid carbon dioxide is filled, the heating assembly is preheated, or the heating assembly is opened and simultaneously the heating assembly is started
The inside of the detonation component 9 is filled with high-temperature low-melting-point molten liquid metal, so that the heat inside the detonation component is transferred to the inside of the first liquid storage pipe 4, the second liquid storage pipe 5 or the third liquid storage pipe 6 through the outer wall of the first liquid storage pipe 4, the second liquid storage pipe 5 or the third liquid storage pipe 6, the position of the detonation component can be controlled according to the actual length of the liquid storage pipes, at the moment, the liquid carbon dioxide is rapidly gasified to be carbon dioxide gas, and because the pressure inside the first liquid storage pipe 4, the second liquid storage pipe 5 and the third liquid storage pipe 6 is increased, the carbon dioxide gas in the first liquid storage pipe 4, the second liquid storage pipe 5 and the third liquid storage pipe 6 can extrude the sealing gasket 74, the spring 73 is stretched and lengthened, so that the carbon dioxide gas overflows, at the moment, the high-pressure carbon dioxide gas fractures the coal seam 10, and achieves the fracturing effect Second liquid reserve pipe 5 and third liquid reserve pipe 6's combination is used, can select to use several sections of liquid reserve pipes according to the degree of depth of coal seam 10, thereby improve work efficiency, through the first main part 71 of energy release, support frame 72, spring 73, the combination of sealed pad 74 and exhaust pressure release hole 75 is used, can make the even inside of diffusion to coal seam 10 of carbon dioxide, thereby make the effect that the send and split anti-reflection better, through setting up heating pipe 9, can follow the outside and carry out high temperature treatment to first liquid reserve pipe 4, the inside liquid carbon dioxide of second liquid reserve pipe 5 and third liquid reserve pipe 6, thereby make first liquid reserve pipe 4, the inside liquid carbon dioxide of second liquid reserve pipe 5 and third liquid reserve pipe 6 gasify rapidly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (5)
1. A carbon dioxide fracturing and permeability increasing device for extracting coal bed gas comprises a liquid carbon dioxide filling assembly, a permeability increasing liquid storage assembly, an energy discharge head (7) and a detonation assembly, wherein the permeability increasing liquid storage assembly extends into a drill hole in a coal bed (10); the innermost end, located in the drill hole, of the anti-reflection liquid storage assembly is provided with the energy leakage head (7), and the energy leakage head (7) can enable carbon dioxide energy after detonation to be discharged from the energy leakage head (7); the detonation assembly is arranged on the outer periphery of the anti-reflection liquid storage assembly, and is characterized in that the anti-reflection liquid storage assembly is assembled together in a mode that a plurality of sections of liquid storage pipes are connected with each other, so that the length of the anti-reflection liquid storage assembly can be adjusted as required; a detonation cavity (18) is arranged between the detonation component and the anti-reflection liquid storage component, and molten liquid metal with a low melting point can be injected into the detonation cavity (18) so as to detonate liquid carbon dioxide in the anti-reflection liquid storage component by using energy released by the molten liquid metal with the low melting point;
the anti-reflection liquid storage assembly at least comprises a first liquid storage pipe (4), a second liquid storage pipe (5) and a third liquid storage pipe (6); the liquid carbon dioxide filling assembly comprises a liquid carbon dioxide storage tank (1), a connecting pipe (2) and a valve (3); the device comprises a liquid carbon dioxide storage tank (1), a connecting pipe (2) and a detonation component (9), wherein the connecting pipe (2) is connected to the top end of the liquid carbon dioxide storage tank (1), a valve (3) is arranged on the outer side of the connecting pipe (2), one end of the connecting pipe (2) is inserted into a first liquid storage pipe (4), a second liquid storage pipe (5) is arranged at the bottom end of the first liquid storage pipe (4), a third liquid storage pipe (6) is arranged at the bottom end of the second liquid storage pipe (5), an energy discharge head (7) is arranged at the bottom end of the third liquid storage pipe (6), the energy discharge head (7) is arranged in a coal seam (10), a hole packer (8) is arranged in the first liquid storage pipe (4), and the detonation component (9) is sleeved on the outer side of;
the first liquid storage pipe (4), the second liquid storage pipe (5) and the third liquid storage pipe (6) are identical in structure, and the first liquid storage pipe (4), the second liquid storage pipe (5) and the third liquid storage pipe (6) are matched for use; the first liquid storage pipe (4) is in threaded or welded connection with the second liquid storage pipe (5), the second liquid storage pipe (5) is in threaded or welded connection with the third liquid storage pipe (6), and the third liquid storage pipe (6) is connected with the energy release head (7);
the energy release head (7) comprises an energy release head main body (71), a support frame (72), a spring (73), a sealing gasket (74) and an exhaust pressure relief hole (75), the energy release head main body (71) is arranged inside the energy release head (7), the support frame (72) is erected at the top end of the inner wall of the energy release head main body (71), the spring (73) is connected to the bottom end of the support frame (72), the sealing gasket (74) is connected to the lower portion of the spring (73), and the exhaust pressure relief hole (75) is formed in the side face and the bottom end of the energy release head main body (71);
the detonation assembly comprises a detonation seat (16), an end cover disc (13) and a heating assembly, wherein the detonation seat (16) is sleeved at a detonation part outside the liquid storage pipe, an inner wall of the detonation seat (16) and an outer wall of the liquid storage pipe are arranged to form a detonation cavity (18), an inner end part of the detonation seat (16) is adopted, the end cover disc (13) and the liquid storage pipe are arranged in a sealing mode, the heating assembly is arranged in the detonation cavity (18), a groove (14) is formed in the outer wall of the detonation seat part, a protrusion (15) is arranged at the position of the groove and right above the detonation seat (16), the heating assembly is arranged or wound on the protrusion (15), and the heating assembly (9) is a heating coil or a heating electrode.
2. The carbon dioxide fracturing and permeability increasing device for extracting coal bed gas according to claim 1, wherein the groove (14) is spirally wound on the outer circumferential surface of the liquid storage pipe; or the groove (14) comprises a plurality of circular grooves which are arranged on the outer circumferential surface of the liquid storage pipe at intervals.
3. The carbon dioxide fracturing and permeability increasing device for extracting coal bed gas according to claim 1, wherein the low-melting-point molten liquid metal is one or more of metal tin, brazing filler metal and zinc.
4. The carbon dioxide fracturing and permeability increasing device for extracting coal bed gas as claimed in claim 1, further comprising a low-melting-point molten liquid metal recovery assembly, wherein the low-melting-point molten liquid metal recovery assembly comprises a recovery suction pipe (12) and a blowing pipe (17), the recovery suction pipe (12) and the blowing pipe (17) both extend into the detonation chamber (18), the blowing pipe (17) is located above the recovery suction pipe (12), the heating assembly is in a heating working state during recovery, the blowing pipe blows hot gas into the detonation chamber (18), and the recovery suction pipe (12) recovers molten low-melting-point metal in a low-flow state.
5. The carbon dioxide fracturing and permeability increasing device for extracting coal bed gas as claimed in claim 1, wherein the sealing gasket (74) is a rubber component, and the shape of the sealing gasket (74) is cylindrical.
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| CN201811629241.7A CN109611057B (en) | 2018-12-28 | 2018-12-28 | Carbon dioxide fracturing and permeability increasing device for coal bed gas extraction |
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| CN201811629241.7A CN109611057B (en) | 2018-12-28 | 2018-12-28 | Carbon dioxide fracturing and permeability increasing device for coal bed gas extraction |
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| RU2547873C1 (en) * | 2013-12-10 | 2015-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный минерально-сырьевой университет "Горный" | Method of stimulation of coal bed through wells drilled from excavations |
| CN105201481B (en) * | 2015-10-17 | 2018-02-27 | 山西晋煤集团技术研究院有限责任公司 | Liquid CO2Phase transformation multiple spot fracturing anti-reflection method |
| CN206439041U (en) * | 2017-01-17 | 2017-08-25 | 山西工程技术学院 | A kind of experimental provision for simulating the anti-reflection coal seam of carbon dioxide fracturing |
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