CN112065318A - Energetic material rod structure resistant to high temperature and high pressure and application thereof - Google Patents
Energetic material rod structure resistant to high temperature and high pressure and application thereof Download PDFInfo
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- CN112065318A CN112065318A CN201910937015.3A CN201910937015A CN112065318A CN 112065318 A CN112065318 A CN 112065318A CN 201910937015 A CN201910937015 A CN 201910937015A CN 112065318 A CN112065318 A CN 112065318A
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- Prior art keywords
- energetic material
- resistant
- pipe body
- shaped pipe
- plug
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- Pending
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- 239000000463 material Substances 0.000 title claims abstract description 57
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims description 19
- 230000035939 shock Effects 0.000 claims description 13
- 229910010293 ceramic material Inorganic materials 0.000 claims description 6
- CERGKWMVRAUFNU-UHFFFAOYSA-L [O-]O[O-].[Ba+2] Chemical compound [O-]O[O-].[Ba+2] CERGKWMVRAUFNU-UHFFFAOYSA-L 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000002048 multi walled nanotube Substances 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002041 carbon nanotube Substances 0.000 description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004830 Super Glue Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- 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
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Particle Accelerators (AREA)
Abstract
The invention provides a high-temperature and high-pressure resistant energetic material rod structure and application thereof.A high-temperature resistant shell comprises a U-shaped pipe body and a plug, wherein the U-shaped pipe body adopts a hollow cylindrical structure with one open end and one closed end, one end of the plug is of a hemispherical compression-resistant structure, the other end of the plug is of a cylindrical structure matched with the open end of the U-shaped pipe body, the U-shaped pipe body is connected with the plug in a bonding mode, fixing holes for fixing metal wires are formed in the central positions of the closed end of the U-shaped pipe body and the plug, the head end and the tail end of each metal wire are respectively fixed in the fixing holes through fixing pieces, powdery energetic materials are uniformly filled in a cavity of the U-shaped pipe body, and compression-resistant coatings are coated on. The ceramic tube body and the ceramic plug with one closed end are adopted, so that the high-temperature resistance of the shell of the energetic material rod is ensured, the cementing position is reduced, and the possibility of water inflow of a cementing surface is reduced.
Description
Technical Field
The invention relates to the technical field of controllable shock wave application devices, in particular to a high-temperature and high-pressure resistant energetic material rod structure and application thereof.
Background
One of the key parts of the equipment for generating the controllable shock wave technology applied to the yield and injection increasing of the oil-water well is an energetic material rod with an energetic material coated on a metal wire. Under the drive of plasma generated by metal wire electric explosion, the powdery energetic material in the energetic material rod can form stable detonation, local strong pulse shock waves are formed in water and act on various reservoirs, and the blockage removal of an oil-water well and the permeability increase of shale gas and coal bed gas reservoirs can be realized, so that the aims of yield increase and high-efficiency exploitation are fulfilled.
In the current controllable shock wave generation technology, the used energetic material rod has a basic structure that powdery energetic materials are placed in plastic shells made of organic glass and the like, and metal wires penetrate through end heads at two ends and are bonded by super glue. The structure is successfully applied to underground drilling of coal mines, oil-water wells and coal-bed gas wells with the well depth of less than 1500 meters, but the problems of housing fracture and deformation of energetic material rods, water inflow caused by sealing failure between metal wires and the housing and the like occur under the conditions of high local temperature, local pressurization and the like in use, and the success rate of controllable shock wave operation is reduced. Particularly, when the technology is applied to high-temperature and high-pressure oil-water wells in offshore oil fields, the energetic material rod with the structure cannot be used, and the application range and the application field of controllable shock waves are greatly limited.
Disclosure of Invention
The invention overcomes the defects in the prior art, and solves the problems of the housing of the energetic material rod cracking and deforming, the sealing failure between the metal wire and the housing and water inflow caused by the local temperature rise, the local pressure rise and the like, thereby reducing the success rate of the controllable shock wave operation, providing the energetic material rod structure with high temperature and high pressure resistance and the application thereof.
The purpose of the invention is realized by the following technical scheme.
An energetic material bar structure resistant to high temperature and high pressure comprises a high temperature resistant shell, a powdery energetic material, a metal wire, a fixing piece and a compression-resistant coating,
the high-temperature-resistant shell comprises a U-shaped pipe body and a plug, the U-shaped pipe body is of a hollow cylindrical structure with one open end being sealed, one end of the plug is of a hemispherical compression-resistant structure, the other end of the plug is of a cylindrical structure matched with the open end of the U-shaped pipe body, the U-shaped pipe body is connected with the plug in a bonding mode, a fixing hole used for fixing a metal wire is formed in the closed end of the U-shaped pipe body and the center position of the plug, the head end and the tail end of the metal wire are fixed in the fixing hole through fixing pieces respectively, the cavity of the U-shaped pipe body is uniformly filled with the powdery energetic material, and the compression-resistant coating is coated on the outer sides of the U-shaped pipe body and the plug.
The U-shaped pipe body and the plug are both formed by firing an aluminum oxide high-temperature ceramic material, and the high-temperature ceramic material resists temperature of 150 ℃.
The metal wire is made of metal tungsten, metal tantalum or metal copper, and the diameter of the metal wire is 300-500 mu m.
The powdery energetic material consists of aluminum powder, barium trioxide and paraffin, wherein the mass percentages of the aluminum powder, the barium trioxide and the paraffin are (5-15%): (80-90%): (3-10%) with a particle size of 20-200 μm, and said powdery energetic material is mixed by a wet method to ensure dispersibility and optimum packing density.
The fixing piece is a rivet.
The compression-resistant coating adopts a multi-walled carbon nanotube coating.
The energetic material rod structure is driven by a pulse power driving source of more than 800J.
The energetic material rod structure can bear hydrostatic pressure of 50MPa, and does not crack, deform or seep water within 5 hours.
The energetic material rod structure can generate shock waves with the amplitude of more than 15MPa in water 55cm away from the rod core under the driving of a pulse power driving source.
The invention has the beneficial effects that: the ceramic tube body and the ceramic plug with one closed end are adopted, so that on one hand, the high temperature resistance of the shell of the energetic material rod is ensured, on the other hand, the cementing position is reduced, and the possibility of water inflow of a cementing surface is reduced; the stability of the energetic material rod structure is improved by the hemispherical structures at the two ends of the U-shaped pipe body and the plug; the riveting structures of the metal wire at the two ends of the energetic material rod ensure the sealing property of the metal wire part by two means of pressurization and cementing; after the energetic material rod is assembled, the surface of the energetic material rod is coated with the carbon nano tube coating, a stable scaffold structure is formed on the surface of ceramic, the structural stability of the whole energetic material rod is improved, the pressure resistance can reach 50MPa, the energetic material rod can be applied to high-temperature and high-pressure oil-water wells of offshore oil fields, and the applicability of the controllable shock wave technology is effectively widened.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1 is a powdery energetic material, 2 is a metal wire, 3 is a U-shaped pipe body, 4 is a plug, 5 is a fixing piece, and 6 is a compression-resistant coating.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
An energetic material bar structure resistant to high temperature and high pressure comprises a high temperature resistant shell, a powdery energetic material 1, a metal wire 2, a fixing piece 5 and a compression-resistant coating 6,
high temperature resistant shell includes U type body 3 and end cap 4, U type body 3 adopts the uncovered one end of one end to be confined hollow cylinder structure, the one end of end cap 4 is hemisphere compressive structures, the other end of end cap 4 is for the cylindricality structure with U type body 3's opening end assorted cylindricality, U type body 3 links to each other with end cap 4 through the mode that bonds, the fixed orifices that is used for fixed wire 2 is offered in the blind end of U type body 3 and the central point department of end cap 4, the head and the tail both ends of wire 2 are fixed in the fixed orifices through mounting 5 respectively, mounting 5 adopts the rivet, evenly fill likepowder energetic material 1 in U type body 3's cavity, at U type body 3 and end cap 4's outside coating compressive coating 6, compressive coating 6 adopts the carbon nanotube coating.
Example two
On the basis of the first embodiment, the U-shaped pipe body 3 and the plug 4 are both formed by firing an aluminum oxide high-temperature ceramic material, and the high-temperature ceramic material resists temperature of 150 ℃.
The metal wire 2 is made of metal tungsten, metal tantalum or metal copper, and the diameter of the metal wire 2 is 300-500 μm.
The powdery energetic material 1 comprises a strong oxidant, nitrocellulose, nitrate and the like, the particle size of the powdery energetic material 1 is 20-200 mu m, and the powdery energetic material 1 is mixed by a wet method to ensure the dispersibility and the optimal filling density.
The compression-resistant coating 6 adopts a multi-wall carbon nano tube coating.
During assembly, the head end of the metal wire 2 is riveted on a fixing hole in the center of the hemispherical closed end of the U-shaped pipe body 3 through a rivet and is reinforced by sealant, then the powdery energetic material 1 is filled into the U-shaped pipe body 3 according to the designed quality, the tail end of the metal wire 2 is riveted on the fixing hole of the plug 4 through the rivet and is reinforced by the sealant, then the plug 4 is inserted into the open end of the U-shaped pipe body 3 and is bonded together through strong ceramic glue, and then the outer surfaces of the U-shaped pipe body 3 and the plug 4 are coated with a compression-resistant coating 6, namely a carbon nano tube coating.
EXAMPLE III
On the basis of the second embodiment, the application of the energetic material rod structure resistant to high temperature and high pressure in the controllable shock wave equipment under the high temperature and high pressure condition needs to adopt a pulse power driving source of more than 800J for driving.
Pressure test of the energetic material rod resistant to high temperature and high pressure:
designing a pressure cavity with the inner diameter of 150mm, the length of 200mm and the wall thickness of 30mm, preparing an 80MPa electric pressurizing pump, putting the high-temperature and high-pressure resistant energetic material rod into the pressure cavity after the rod is manufactured, boosting the pressure at the speed of 10MPa/min, enabling the rod to withstand 10min every 10MPa, boosting the pressure to 50MPa, stabilizing the pressure for 5h, and determining that the rod is not damaged, deformed and seeped.
The energetic material rod structure can generate shock waves with the amplitude of more than 15MPa in water 55cm away from the rod core under the driving of a pulse power driving source.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. The utility model provides a high temperature and high pressure resistant energetic material stick structure which characterized in that: comprises a high-temperature resistant shell, a powdery energetic material, a metal wire, a fixing piece and a compression-resistant coating,
the high-temperature-resistant shell comprises a U-shaped pipe body and a plug, the U-shaped pipe body is of a hollow cylindrical structure with one open end being sealed, one end of the plug is of a hemispherical compression-resistant structure, the other end of the plug is of a cylindrical structure matched with the open end of the U-shaped pipe body, the U-shaped pipe body is connected with the plug in a bonding mode, a fixing hole used for fixing a metal wire is formed in the closed end of the U-shaped pipe body and the center position of the plug, the head end and the tail end of the metal wire are fixed in the fixing hole through fixing pieces respectively, the cavity of the U-shaped pipe body is uniformly filled with the powdery energetic material, and the compression-resistant coating is coated on the outer sides of the U-shaped pipe body and the plug.
2. The energetic material rod structure resistant to high temperature and high pressure according to claim 1, wherein: the U-shaped pipe body and the plug are both formed by firing an aluminum oxide high-temperature ceramic material, and the high-temperature ceramic material resists temperature of 150 ℃.
3. The energetic material rod structure resistant to high temperature and high pressure according to claim 1, wherein: the metal wire is made of metal tungsten, metal tantalum or metal copper, and the diameter of the metal wire is 300-500 mu m.
4. The energetic material rod structure resistant to high temperature and high pressure according to claim 1, wherein: the powdery energetic material consists of aluminum powder, barium trioxide and paraffin, wherein the mass percentages of the aluminum powder, the barium trioxide and the paraffin are (5-15%): (80-90%): (3-10%) with a particle size of 20-200 μm, and said powdery energetic material is mixed by a wet method to ensure dispersibility and optimum packing density.
5. The energetic material rod structure resistant to high temperature and high pressure according to claim 1, wherein: the fixing piece is a rivet.
6. The energetic material rod structure resistant to high temperature and high pressure according to claim 1, wherein: the compression-resistant coating adopts a multi-walled carbon nanotube coating.
7. Use of a high temperature and high pressure resistant energetic material rod structure according to any one of claims 1 to 6 in a high temperature and high pressure controlled shock wave device.
8. Use according to claim 7, characterized in that: the energetic material rod structure is driven by a pulse power driving source of more than 800J.
9. Use according to claim 8, characterized in that: the energetic material rod structure can bear hydrostatic pressure of 50MPa, and does not crack, deform or seep water within 5 hours.
10. Use according to claim 9, characterized in that: the energetic material rod structure can generate shock waves with the amplitude of more than 15MPa in water 55cm away from the rod core under the driving of a pulse power driving source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937015.3A CN112065318A (en) | 2019-09-29 | 2019-09-29 | Energetic material rod structure resistant to high temperature and high pressure and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910937015.3A CN112065318A (en) | 2019-09-29 | 2019-09-29 | Energetic material rod structure resistant to high temperature and high pressure and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112065318A true CN112065318A (en) | 2020-12-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910937015.3A Pending CN112065318A (en) | 2019-09-29 | 2019-09-29 | Energetic material rod structure resistant to high temperature and high pressure and application thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN112065318A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112867218A (en) * | 2021-01-05 | 2021-05-28 | 西安交通大学 | Metal wire electric explosion method for enhancing energy discharge of energetic material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882582A (en) * | 1957-10-02 | 1961-11-15 | William Edward Ballard | Improvements in or relating to methods for applying coatings of substances to surfaces |
| CN2170371Y (en) * | 1993-05-12 | 1994-06-29 | 西安石油学院 | Constant temp. gas generator without shell |
| JPH11257899A (en) * | 1998-01-07 | 1999-09-24 | Hitachi Zosen Corp | Destroying method |
| JP2007024430A (en) * | 2005-07-20 | 2007-02-01 | Hitachi Zosen Corp | Discharge impact breaking device |
| CN102575922A (en) * | 2009-09-28 | 2012-07-11 | 日立造船株式会社 | Blasting cartridge, demolition device, and demolition method |
| CN103539353A (en) * | 2013-09-27 | 2014-01-29 | 昆山市奋发绝缘材料有限公司 | Pressure-proof insulating material |
| CN104628498A (en) * | 2015-02-12 | 2015-05-20 | 西安近代化学研究所 | Energetic polyoxide compound super-thermite and preparation method thereof |
| CN105674818A (en) * | 2016-02-03 | 2016-06-15 | 西安贯通能源科技有限公司 | Method driving energetic electrode to release energy and produce shock waves by high-voltage discharge |
| CN108278106A (en) * | 2018-01-12 | 2018-07-13 | 西安交通大学 | It is a kind of to be used to generate transmission increasing cumulative stick of controllable shock wave and preparation method thereof |
| CN110006301A (en) * | 2019-04-04 | 2019-07-12 | 浙江迅蓝智能科技有限公司 | A kind of method of exploding wires driving commercial explosive explosion |
-
2019
- 2019-09-29 CN CN201910937015.3A patent/CN112065318A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882582A (en) * | 1957-10-02 | 1961-11-15 | William Edward Ballard | Improvements in or relating to methods for applying coatings of substances to surfaces |
| CN2170371Y (en) * | 1993-05-12 | 1994-06-29 | 西安石油学院 | Constant temp. gas generator without shell |
| JPH11257899A (en) * | 1998-01-07 | 1999-09-24 | Hitachi Zosen Corp | Destroying method |
| JP2007024430A (en) * | 2005-07-20 | 2007-02-01 | Hitachi Zosen Corp | Discharge impact breaking device |
| CN102575922A (en) * | 2009-09-28 | 2012-07-11 | 日立造船株式会社 | Blasting cartridge, demolition device, and demolition method |
| CN103539353A (en) * | 2013-09-27 | 2014-01-29 | 昆山市奋发绝缘材料有限公司 | Pressure-proof insulating material |
| CN104628498A (en) * | 2015-02-12 | 2015-05-20 | 西安近代化学研究所 | Energetic polyoxide compound super-thermite and preparation method thereof |
| CN105674818A (en) * | 2016-02-03 | 2016-06-15 | 西安贯通能源科技有限公司 | Method driving energetic electrode to release energy and produce shock waves by high-voltage discharge |
| CN108278106A (en) * | 2018-01-12 | 2018-07-13 | 西安交通大学 | It is a kind of to be used to generate transmission increasing cumulative stick of controllable shock wave and preparation method thereof |
| CN110006301A (en) * | 2019-04-04 | 2019-07-12 | 浙江迅蓝智能科技有限公司 | A kind of method of exploding wires driving commercial explosive explosion |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112867218A (en) * | 2021-01-05 | 2021-05-28 | 西安交通大学 | Metal wire electric explosion method for enhancing energy discharge of energetic material |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20211228 Address after: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant after: CHINA NATIONAL OFFSHORE OIL Corp. Applicant after: CNOOC ENERGY TECHNOLOGY & SERVICES Ltd. Address before: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Applicant before: CHINA NATIONAL OFFSHORE OIL Corp. Applicant before: CNOOC ENERGY TECHNOLOGY & SERVICES Ltd. Applicant before: XI'AN JIAOTONG University |
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Application publication date: 20201211 |
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| RJ01 | Rejection of invention patent application after publication |