CN110454161B - Multi-pulse gas explosion pre-splitting equipment for coal mining - Google Patents
Multi-pulse gas explosion pre-splitting equipment for coal mining Download PDFInfo
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- CN110454161B CN110454161B CN201910787318.1A CN201910787318A CN110454161B CN 110454161 B CN110454161 B CN 110454161B CN 201910787318 A CN201910787318 A CN 201910787318A CN 110454161 B CN110454161 B CN 110454161B
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- 238000004880 explosion Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 238000005065 mining Methods 0.000 title claims abstract description 23
- 238000005474 detonation Methods 0.000 claims abstract description 102
- 230000001960 triggered effect Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 29
- 230000000977 initiatory effect Effects 0.000 claims description 16
- 230000037452 priming Effects 0.000 claims description 16
- 239000003999 initiator Substances 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000005422 blasting Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001020 rhythmical effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to a multi-pulse gas explosion pre-splitting device for coal mining, which is characterized in that a plurality of sections of a low trigger point detonating section A, a middle trigger point detonating section B and a high trigger point detonating section C which are arranged at intervals are arranged; after the detonator is triggered and detonated, the low trigger point detonation section A on the upper portion detonates firstly, the middle trigger point detonation section B can be triggered to detonate only after the low trigger point detonation section A detonates, and the high trigger point detonation section C adjacent to the middle trigger point detonation section B can be triggered to detonate after the middle trigger point detonation section B detonates, so that multi-pulse detonation and pre-splitting of a coal bed can be well realized, the crack performance of a pre-splitting part is improved, and subsequent gas extraction is facilitated. According to the invention, the control of different detonation times of the low-trigger-point detonation section A, the medium-trigger-point detonation section B and the high-trigger-point detonation section C is realized by arranging the detonation valves with different required energy or required detonation pressures, so that sequential detonation is realized, sequential and orderly multi-pulse detonation is ensured, and the pre-splitting capability is improved.
Description
Technical Field
The invention relates to the technical field of blasting devices, in particular to multi-pulse gas explosion pre-splitting equipment for coal mining.
Background
For coal mining, in order to enable gas such as gas in a coal seam to be quickly released and facilitate drilling and mining of the coal seam, pre-splitting operation is generally required to be performed on the coal seam of the coal mine, the pre-splitting can effectively generate cracks, the cracks can well help gas extraction, and subsequent coal seam mining and blanking are facilitated.
However, for the pre-splitting of the coal seam, the liquid carbon dioxide blasting device used by the existing blasting device generally can only realize one-time blasting and cannot realize multi-time rhythmic multi-pulse blasting, which causes that the cracking of the blasting part is large and the safety of the coal seam support and the like is adversely affected, or the cracking is small, so that the pre-splitting effect of the blasting in a large range is difficult to achieve and the coal mining capability is affected.
Therefore, the invention provides a multi-pulse gas explosion pre-splitting device for coal mining, which aims to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a multi-pulse gas explosion pre-splitting device for coal mining, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the multi-pulse gas explosion pre-splitting equipment for coal mining comprises an initiator, an upper centralizer, a lower centralizer and a multi-pulse gas explosion fracturing section, wherein the initiator is installed at the top of the upper centralizer, and the multi-pulse gas explosion fracturing section is connected and arranged between the upper centralizer and the lower centralizer; the multi-pulse gas explosion fracturing section comprises a liquid loading section of a tubular structure and a connection control section of the tubular structure, and the liquid loading sections of two adjacent tubular structures are connected together by adopting the connection control section; the liquid charging section at least comprises a plurality of sections of low trigger point detonating sections A, middle trigger point detonating sections B and high trigger point detonating sections C which are arranged at intervals; and after the detonator triggers detonation, the low trigger point detonation segment A at the upper part detonates firstly, the middle trigger point detonation segment B can be triggered to detonate only after the low trigger point detonation segment A detonates, and then the high trigger point detonation segment C adjacent to the middle trigger point detonation segment B can be triggered to detonate after the middle trigger point detonation segment B detonates.
Further, preferably, a detonation lead which is located at the center of the multi-pulse gas explosion fracturing section and extends along the axial direction of the multi-pulse gas explosion fracturing section is arranged in the multi-pulse gas explosion fracturing section, and the detonation lead can directly trigger the low-trigger-point detonation section A to detonate.
Further, preferably, one end of the liquid charging section is provided with a first threaded connecting column with a tubular structure, and the other end of the liquid charging section is provided with a second threaded connecting column with a tubular structure; the inner cavity of the liquid charging section is internally provided with initiating liquid medicine, the periphery of the liquid charging section is provided with a plurality of axially extending notches, a plurality of jet holes are distributed on the notches, and initiating valves for controlling the energy or the initiating pressure required by initiation are arranged in the jet holes.
Preferably, both ends of the connection control section are provided with threaded holes in threaded connection with the first threaded connection column or the second threaded connection column, and the bottom wall of each threaded hole is provided with a small hole for the detonation lead to pass through; and the first threaded connecting column or the second threaded connecting column is sleeved with a sealing connecting ring.
Further, as preferred, be provided with two at least radially extending's connecting string on the first threaded connection post of connection control section and/or the second threaded connection post respectively, the both ends of connection control section correspond the position of connecting string is provided with and holds the draw-in groove, the connecting string can block to establish and stretch into hold in the draw-in groove, just still adopt the hole intercommunication that triggers between the draw-in groove that holds at connection control section both ends, trigger downthehole being provided with the trigger bar, after low trigger point detonating section A or the detonating section B of well trigger point detonating, detonating impact energy can make the trigger bar produce heat, and apply the heat of trigger bar in well trigger point detonating section B or high trigger point detonating section C to can trigger well trigger point detonating section B or high trigger point detonating section C and detonate.
Further, preferably, no trigger rod is arranged in a trigger hole in the connection control section between the high trigger point detonation section C and the low trigger point detonation section a.
Further, preferably, the number of the trigger rods on the connection control section between the low trigger point priming section a and the intermediate trigger point priming section B is less than the number of the trigger rods on the connection control section between the intermediate trigger point priming section B and the high trigger point priming section C.
Preferably, a radial mounting hole which is radially through is formed in the position, where the connecting pipe column is mounted, of the first threaded connecting column or the second threaded connecting column, an air outlet hole is formed in the radial inner side of the radial mounting hole, the first spring is sleeved in the radial mounting hole, one end of the first spring abuts against the air outlet hole, the other end of the first spring is connected with the connecting pipe column in an abutting mode, and the connecting pipe column is of a T-shaped structure.
Further, as an optimization, a clamping block is arranged in the accommodating clamping groove, a guide post extending in the radial direction is arranged on the outer side of the accommodating clamping groove, a second spring is sleeved on the guide post, a limiting sliding shoulder is connected and arranged on the outer side of the clamping block in the radial direction, the limiting sliding shoulder is in sliding fit with the guide post and is abutted against the second spring, a gap is formed between the clamping block and the inner wall of the accommodating clamping groove, and the second spring enables the connecting pipe column and the clamping block to be abutted against and connected.
Further, preferably, the priming valve mechanism of the liquid charging section is configured such that the priming temperatures or the required priming energies of the low trigger point priming section a, the intermediate trigger point priming section B, and the high trigger point priming section C are sequentially increased.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is provided with a plurality of sections of low trigger point detonating sections A, middle trigger point detonating sections B and high trigger point detonating sections C which are arranged at intervals; therefore, after the detonator triggers detonation, the low trigger point detonation section A on the upper portion detonates firstly, the low trigger point detonation section A can trigger the middle trigger point detonation section B after detonation, and then the middle trigger point detonation section B can trigger the high trigger point detonation section C adjacent to the middle trigger point detonation section B after detonation, so that multi-pulse detonation pre-splitting of a coal seam can be well realized, the crack performance of a pre-splitting part is improved, and subsequent gas extraction is facilitated.
2. According to the invention, the control of different detonation times of the low-trigger-point detonation section A, the medium-trigger-point detonation section B and the high-trigger-point detonation section C is realized by arranging the detonation valves with different required energy or required detonation pressures, so that sequential detonation is realized, sequential and orderly multi-pulse detonation is ensured, and the pre-splitting capability is improved.
Drawings
FIG. 1 is a schematic diagram of the overall appearance structure of a multi-pulse gas explosion pre-splitting device for coal mining;
FIG. 2 is a partial structural schematic diagram of a multi-pulse gas explosion fracturing section of a multi-pulse gas explosion pre-fracturing device for coal mining;
FIG. 3 is a schematic diagram of a partially enlarged structure of a multi-pulse gas explosion fracturing section of a multi-pulse gas explosion pre-splitting device for coal mining;
FIG. 4 is an enlarged schematic view of the point A in FIG. 3 of a multi-pulse gas explosion pre-splitting device for coal mining;
fig. 5 is a schematic structural diagram of a liquid charging section in a multi-pulse gas explosion pre-cracking device for coal mining.
Detailed Description
Referring to fig. 1 to 5, in the embodiment of the present invention, a multi-pulse gas detonation pre-splitting apparatus for coal mining includes an initiator 4, an upper centralizer 1, a lower centralizer 21, and a multi-pulse gas detonation fracturing section, where the initiator 4 is installed at the top of the upper centralizer 1, and the multi-pulse gas detonation fracturing section is connected between the upper centralizer 1 and the lower centralizer 21; the multi-pulse gas explosion fracturing section comprises a liquid loading section 3 of a tubular structure and a connection control section 2 of the tubular structure, and the liquid loading sections 3 of two adjacent tubular structures are connected together by adopting the connection control section 2; the liquid charging section 3 at least comprises a plurality of sections of low trigger point detonating sections A, middle trigger point detonating sections B and high trigger point detonating sections C which are arranged at intervals; and after the detonator 4 triggers detonation, the low trigger point detonation segment A at the upper part detonates firstly, the middle trigger point detonation segment B can be triggered to detonate only after the low trigger point detonation segment A detonates, and then the high trigger point detonation segment C adjacent to the middle trigger point detonation segment B can be triggered to detonate after the middle trigger point detonation segment B detonates.
In this embodiment, a detonation lead which is located at the center of the multi-pulse gas explosion fracturing section and extends along the axial direction of the multi-pulse gas explosion fracturing section is arranged in the multi-pulse gas explosion fracturing section, and the detonation lead can directly trigger the low-trigger-point detonation section a to detonate.
As a preferred embodiment, one end of the liquid charging section 3 is provided with a first threaded connection column 5 with a tubular structure, and the other end of the liquid charging section 3 is provided with a second threaded connection column 6 with a tubular structure; the inner cavity 7 of the liquid containing section 3 is filled with initiation liquid medicine, the periphery of the liquid containing section 3 is provided with a plurality of axially extending notches 10, a plurality of jet holes are distributed on the notches, and initiation valves for controlling the energy or the initiation pressure required by initiation are arranged in the jet holes.
The two ends of the connection control section 2 are provided with threaded holes 11 and 12 in threaded connection with the first threaded connecting column 5 or the second threaded connecting column, and the bottom wall of each threaded hole is provided with a small hole for the detonation lead to pass through; and the first threaded connecting column 5 or the second threaded connecting column is sleeved with a sealing connecting ring 9.
In the invention, at least two radially extending connecting pipe columns 8 are respectively arranged on the first threaded connection column 5 and/or the second threaded connection column of the connection control section 2, accommodating clamping grooves 24 are arranged at positions, corresponding to the connecting pipe columns 8, of two ends of the connection control section 2, the connecting pipe columns can be clamped and extend into the accommodating clamping grooves 24, the accommodating clamping grooves at the two ends of the connection control section 2 are communicated through trigger holes, and trigger rods are arranged in the trigger holes.
In a preferred embodiment, no trigger bar is arranged in the trigger hole on the connection control section 2 between the high trigger point initiation section C and the low trigger point initiation section a. The number of the trigger rods on the connection control section 2 between the low trigger point detonation section A and the middle trigger point detonation section B is less than that of the trigger rods on the connection control section 2 between the middle trigger point detonation section B and the high trigger point detonation section C.
The connecting pipe column 8 is installed on the first threaded connecting column 5 or the second threaded connecting column, a radial installing hole 14 which is radially through is formed in the position, where the connecting pipe column 8 is installed, of the first threaded connecting column 5 or the second threaded connecting column, an air outlet hole 26 is formed in the radial inner side of the radial installing hole 14, the first spring 15 is sleeved in the radial installing hole, one end of the first spring abuts against the air outlet hole, the other end of the first spring abuts against the connecting pipe column 8, and the connecting pipe column 8 is of a T-.
A clamping block 17 is arranged in the accommodating clamping groove 24, a guide post 18 extending in the radial direction is arranged on the radial outer side of the accommodating clamping groove 24, a second spring 20 is sleeved on the guide post, a limiting sliding shoulder 19 is connected and arranged on the radial outer side of the clamping block, the limiting sliding shoulder is in sliding fit with the guide post and is abutted against by the second spring, a gap 16 is arranged between the clamping block and the inner wall of the accommodating clamping groove 24, and the second spring enables the connecting pipe column to be abutted against and connected with the clamping block. And the detonation valve mechanisms of the liquid charging section 3 are set such that the detonation temperatures or required detonation energies of the low trigger point detonation section A, the middle trigger point detonation section B and the high trigger point detonation section C are sequentially increased.
The invention is provided with a plurality of sections of low trigger point detonating sections A, middle trigger point detonating sections B and high trigger point detonating sections C which are arranged at intervals; therefore, after the detonator triggers detonation, the low trigger point detonation section A on the upper portion detonates firstly, the low trigger point detonation section A can trigger the middle trigger point detonation section B after detonation, and then the middle trigger point detonation section B can trigger the high trigger point detonation section C adjacent to the middle trigger point detonation section B after detonation, so that multi-pulse detonation pre-splitting of a coal seam can be well realized, the crack performance of a pre-splitting part is improved, and subsequent gas extraction is facilitated. According to the invention, the control of different detonation times of the low-trigger-point detonation section A, the medium-trigger-point detonation section B and the high-trigger-point detonation section C is realized by arranging the detonation valves with different required energy or required detonation pressures, so that sequential detonation is realized, sequential and orderly multi-pulse detonation is ensured, and the pre-splitting capability is improved.
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 (6)
1. The multi-pulse gas explosion pre-splitting equipment for coal mining comprises an initiator (4), an upper centralizer (1), a lower centralizer (21) and a multi-pulse gas explosion fracturing section, wherein the initiator (4) is installed at the top of the upper centralizer (1), and the multi-pulse gas explosion fracturing section is connected and arranged between the upper centralizer (1) and the lower centralizer (21); the multi-pulse gas explosion fracturing section comprises a liquid loading section (3) with a tubular structure and a connection control section (2) with a tubular structure, and the liquid loading sections (3) of two adjacent tubular structures are connected together by adopting the connection control section (2); the liquid charging section (3) at least comprises a plurality of sections of low trigger point detonating sections A, middle trigger point detonating sections B and high trigger point detonating sections C which are arranged at intervals; after the detonator (4) is triggered to detonate, the low trigger point detonation segment A at the upper part detonates firstly, the middle trigger point detonation segment B can be triggered to detonate only after the low trigger point detonation segment A detonates, and then the high trigger point detonation segment C adjacent to the middle trigger point detonation segment B can be triggered to detonate after the middle trigger point detonation segment B detonates;
a detonation lead which is positioned at the center of the multi-pulse gas explosion fracturing section and extends along the axial direction of the multi-pulse gas explosion fracturing section is arranged in the multi-pulse gas explosion fracturing section, and the detonation lead can directly trigger the low trigger point detonation section A to detonate;
one end of the liquid containing section (3) is provided with a first threaded connecting column (5) with a tubular structure, and the other end of the liquid containing section (3) is provided with a second threaded connecting column (6) with a tubular structure; the inner cavity (7) of the liquid containing section (3) is filled with detonation liquid medicine, the periphery of the liquid containing section (3) is provided with a plurality of axially extending notches (10), a plurality of jet holes are distributed on the notches, and a detonation valve for controlling the energy or the detonation pressure required by detonation is arranged in each jet hole;
threaded holes (11,12) in threaded connection with the first threaded connecting column (5) or the second threaded connecting column are formed in the two ends of the connection control section (2), and a small hole for the detonation lead to penetrate through is formed in the bottom wall of each threaded hole; the first threaded connecting column (5) or the second threaded connecting column is sleeved with a sealing connecting ring (9);
be provided with at least two tubular columns (8) that radially extend on first threaded connection post (5) and/or the second threaded connection post of connection control section (2) respectively, the both ends of connection control section (2) correspond the position of tubular column (8) is provided with holds draw-in groove (24), the tubular column can block to establish and stretch into hold in draw-in groove (24), just still adopt between the draw-in groove that holds at connection control section (2) both ends and trigger the hole intercommunication, trigger downthehole being provided with the trigger bar, after low trigger point detonating section A or well trigger point detonating section B detonating, detonating impact energy can make the trigger bar produce the heat, and exert the heat of trigger bar in trigger point detonating section B or high trigger point detonating section C to trigger point detonating section B or high trigger point detonating section C detonating in can triggering.
2. The multi-pulse gas explosion pre-splitting equipment for coal mining according to claim 1, wherein a trigger rod is not arranged in a trigger hole on the connection control section (2) between the high trigger point initiation section C and the low trigger point initiation section A.
3. The multi-pulse gas explosion pre-splitting equipment for coal mining according to claim 1, wherein the number of the trigger bars on the connection control section (2) between the low trigger point initiation section A and the middle trigger point initiation section B is less than that of the trigger bars on the connection control section (2) between the middle trigger point initiation section B and the high trigger point initiation section C.
4. The multi-pulse gas explosion pre-splitting equipment for coal mining according to claim 1, wherein a radial mounting hole (14) which penetrates radially is formed in the position, where the connecting pipe column (8) is mounted, of the first threaded connecting column (5) or the second threaded connecting column, an air outlet hole (26) is formed in the radial inner side of the radial mounting hole (14), a first spring (15) is sleeved in the radial mounting hole, one end of the first spring abuts against the air outlet hole, the other end of the first spring abuts against the connecting pipe column (8), and the connecting pipe column (8) is of a T-shaped structure.
5. The multi-pulse gas explosion pre-splitting equipment for coal mining according to claim 1, wherein a clamping block (17) is arranged in the accommodating clamping groove (24), a guide post (18) extending radially is arranged on the radial outer side of the accommodating clamping groove (24), a second spring (20) is sleeved on the guide post, a limiting sliding shoulder (19) is connected and arranged on the radial outer side of the clamping block, the limiting sliding shoulder is in sliding fit with the guide post and is abutted by the second spring, a gap (16) is formed between the clamping block and the inner wall of the accommodating clamping groove (24), and the second spring enables the connecting pipe column and the clamping block to be abutted and connected.
6. The multi-pulse gas explosion pre-splitting equipment for coal mining according to claim 1, wherein the priming valve mechanism of the liquid charging section (3) is set such that the priming temperatures or the required priming energies of the low trigger point priming section a, the medium trigger point priming section B and the high trigger point priming section C are sequentially increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910787318.1A CN110454161B (en) | 2019-08-23 | 2019-08-23 | Multi-pulse gas explosion pre-splitting equipment for coal mining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910787318.1A CN110454161B (en) | 2019-08-23 | 2019-08-23 | Multi-pulse gas explosion pre-splitting equipment for coal mining |
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| CN110454161A CN110454161A (en) | 2019-11-15 |
| CN110454161B true CN110454161B (en) | 2020-10-09 |
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| CN201910787318.1A Expired - Fee Related CN110454161B (en) | 2019-08-23 | 2019-08-23 | Multi-pulse gas explosion pre-splitting equipment for coal mining |
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| CN113431543A (en) * | 2021-04-27 | 2021-09-24 | 河南理工大学 | Multi-pulse CO2Gas treatment method for fractured coal seam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997008427A1 (en) * | 1995-08-25 | 1997-03-06 | Gosudarstvenny Nauchny Tsentr 'tsentralny Nauchno-Issledovatelsky Institut Khimii I Mekhaniki' | Method of treating the critical zone of a bed and a device for applying the method |
| CN2630491Y (en) * | 2003-06-18 | 2004-08-04 | 西安石油学院 | Multi-pulse multi-stage control fracturing device |
| RU2278252C2 (en) * | 2004-07-29 | 2006-06-20 | Михаил Григорьевич Падерин | Method for gas-hydraulic action application to formation |
| CN102080528A (en) * | 2010-12-28 | 2011-06-01 | 西安航天化学动力厂 | Controllable multiple-pulse gas generator device |
| CN106368663A (en) * | 2016-11-17 | 2017-02-01 | 西安物华巨能爆破器材有限责任公司 | Oil-gas well high-energy gas fracturing yield increasing device |
| CN109915080A (en) * | 2019-04-12 | 2019-06-21 | 西安石油大学 | A kind of grey association cluster perforation multiple-pulse combined type fracturing device |
-
2019
- 2019-08-23 CN CN201910787318.1A patent/CN110454161B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997008427A1 (en) * | 1995-08-25 | 1997-03-06 | Gosudarstvenny Nauchny Tsentr 'tsentralny Nauchno-Issledovatelsky Institut Khimii I Mekhaniki' | Method of treating the critical zone of a bed and a device for applying the method |
| CN2630491Y (en) * | 2003-06-18 | 2004-08-04 | 西安石油学院 | Multi-pulse multi-stage control fracturing device |
| RU2278252C2 (en) * | 2004-07-29 | 2006-06-20 | Михаил Григорьевич Падерин | Method for gas-hydraulic action application to formation |
| CN102080528A (en) * | 2010-12-28 | 2011-06-01 | 西安航天化学动力厂 | Controllable multiple-pulse gas generator device |
| CN106368663A (en) * | 2016-11-17 | 2017-02-01 | 西安物华巨能爆破器材有限责任公司 | Oil-gas well high-energy gas fracturing yield increasing device |
| CN109915080A (en) * | 2019-04-12 | 2019-06-21 | 西安石油大学 | A kind of grey association cluster perforation multiple-pulse combined type fracturing device |
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