CN103484086B - Gel particle type plugging agent and preparation method - Google Patents
Gel particle type plugging agent and preparation method Download PDFInfo
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- CN103484086B CN103484086B CN201210192848.XA CN201210192848A CN103484086B CN 103484086 B CN103484086 B CN 103484086B CN 201210192848 A CN201210192848 A CN 201210192848A CN 103484086 B CN103484086 B CN 103484086B
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- 239000007863 gel particle Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002981 blocking agent Substances 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 159000000007 calcium salts Chemical group 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 5
- 238000007873 sieving Methods 0.000 abstract description 5
- 239000000725 suspension Substances 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000007596 consolidation process Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 239000006260 foam Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229920001864 tannin Polymers 0.000 description 3
- 239000001648 tannin Substances 0.000 description 3
- 235000018553 tannin Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 206010046996 Varicose vein Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000008055 alkyl aryl sulfonates Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 235000019357 lignosulphonate Nutrition 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 150000004831 organic oxygen compounds Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention belongs to a day technical field of petroleum extraction, particularly relate to a kind of gel particle type plugging agent and preparation method, technical scheme of the present invention is: gel particle type plugging agent, be made up of material of main part, adding material and water, described material of main part is that the G class g cement of 50-90% and the particle blocking agent of 50-10% form by weight ratio, the described adding material accounting for material of main part weight percent is made up of the reinforcer of 0.5%-3% and the solidifying agent of 1%-3%, material based on described material of main part and adding material, the weight ratio of described base mateiral and water is 1:5-7.When horizontal section shutoff, the suspension of gel particle is good, good fluidity, sieving property are good, high temperature resistant, easily enter stratum, expense is low, thus reaches the object that precise screen pipe horizontal well shutoff risk is low, validity period long, shutoff success ratio is high.
Description
Technical field
The invention belongs to a day technical field of petroleum extraction, particularly relate to and can reach the effective water blockoff of precise screen pipe horizontal well
Gel particle type plugging agent, and preparation method thereof, the needs of heavy crude heat extraction exploitation can be met.
Background technology
Handle up the development phase along with viscous crude main force oil field enters high round, thick oil horizontal well High water cut problem becomes increasingly conspicuous,
Development effectiveness worse and worse.At present only now river heavy crude heat extraction horizontal well drives a well 147 mouthfuls, and owing to the factor impact such as to invade in edge-bottom water, the moisture horizontal well being greater than 90% has 79 mouthfuls at present, accounts for and drives a well several 53.7%.Seriously constrain the heavy crude reservoir stable yields basis of our factory.In recent years, accurate sand screen technology dominated supporting technology as horizontal well, obtained large-scale promotion, although solve the problems such as sand production, increased the difficulty of heavy crude reservoir water blockoff.
Current heavy crude reservoir water blockoff faces following difficult point: the application of (1) accurate sand screen, high to blocking agent Particle size requirements, requires that blocking agent " is noted "; (2) heavy oil wells adopts steam thermal recovery, requires that blocking agent temperature resistant capability is strong; (3) oil well is affected on strong edge-bottom water, require that blocking agent intensity is high; (4) shutoff validity period is long, cheap; (5) consider the security of construction, require that horizontal section bores plug construction risk little.
Domestic and international viscous crude water-plugging technique present situation: (1) high temperature foam profile control.The characteristic that foam has " meet oily froth breaking, meet aquatic bubble ", can play water blockoff, adjust steam entry profile, realize the object that horizontal section evenly employs.Main component: long-chain alkyl aryl sulfonate.But field practice proves, nitrogen foam intensity is relatively low, poor for strong edge-bottom water shutoff suitability.(2) high-molecular gel and gelled plugging agent.Mainly contain: sulfonated lignin, humic acids and tannin extract gellike or frozen glue high-temperature profile control plugging agent.Wherein, tannin extract type high temp profile-controlling and plugging agent heat resistance is higher, can reach about 250 DEG C, and receive more concern in heavy crude heat extraction profile control and water plugging at home, but intensity is low, validity period is short, cost is high, and onsite application is subject to a definite limitation.(3) type thermosetting resin blocking agent.Mainly contain: heat cured resol, epoxy resin, furfuryl alcohol resin block up and furane resin.Resene plugging and profile tool has the following advantages: can inject formation pore and have sufficiently high intensity; Shortcoming: shutoff does not have selectivity, curing speed is to the very responsive poor controllability of temperature.(4) inorganic cement and the shutoff of precipitation class: mainly contain cement class, superfine cement one flyash plugging agent, Calucium Silicate powder blocking agent.Feature is rigidity shutoff, and shut-off capacity is strong, but shutoff does not have selectivity, and easily damage the rate of permeation of whole reservoir, sieving rate is low.
Along with deepening continuously of thick oil horizontal well Simulation on whole pay zones, to performance of sieving, temperature tolerance, selectivity, the heat of blocking agent
Stability and plugging strength are proposed higher requirement, need to carry out further research.
Summary of the invention
The object of the invention is to, overcome the deficiencies in the prior art, for problems such as precise screen pipe water plugging of horizontal well difficulty large, common blocking agent heatproof weak effects, through great many of experiments, the screening of multiple plugging agent, multiple additives, develops the gel particle type plugging agent being applicable to precise screen pipe horizontal well.When horizontal section shutoff, the suspension of gel particle is good, good fluidity, sieving property are good, high temperature resistant, easily enter stratum, expense is low, thus reaches the object that precise screen pipe horizontal well shutoff risk is low, validity period long, shutoff success ratio is high.Present invention also offers the preparation method of gel particle type plugging agent simultaneously.
For solving the problems of the technologies described above, technical scheme of the present invention is: gel particle type plugging agent, be made up of material of main part, adding material and water, described material of main part is that the G class g cement of 50-90% and the particle blocking agent of 50-10% form by weight ratio, the described adding material accounting for material of main part weight percent is made up of the reinforcer of 0.5%-3% and the solidifying agent of 1%-3%, material based on described material of main part and adding material, the weight ratio of described base mateiral and water is 1:5-7.Described particle blocking agent is commercial polypropylene family macromolecule compound.
In the suspension property improving host and temperature tolerance, respectively gel particle, guanidine glue, tannin extract, Mierocrystalline cellulose four kinds of admixtures are tested, finally determine that gel particle dissolution rate is fast, good to the suspension property of host, condensate rate is little, and the condensate rate of 30min reduces to 2ml by 50ml, and heat resistance significantly improves, rise to 180 DEG C by 90 DEG C, reach exploitation via steam injection requirement.
Reinforcer of the present invention is calcium salt, and what contrast was screened has fine silt and natural earth.
Solidifying agent of the present invention is organic oxygen compound, and what contrast was screened has calcium carbonate, flyash and fine silica powder.
By reinforcer and solidifying agent, improve consolidation time and the ultimate compression strength of blocking agent, consolidation time foreshortens to 14h by 26h, and ultimate compression strength is increased to 2.4MPa by 0.5MPa, will fill a prescription perfect further, and after final test, indices all reaches requirement.
The preparation method of gel particle type plugging agent of the present invention, by the addition of regulation, first mixes G class g cement with particle blocking agent, then adds reinforcer and solidifying agent mixes, the formation gel particle type that finally adds water plugging agent.
The invention has the beneficial effects as follows: gel particle type plugging agent, be made up of material of main part, adding material and water, described material of main part is that the G class g cement of 50-90% and the particle blocking agent of 50-10% form by weight ratio, the described adding material accounting for material of main part weight percent is made up of the reinforcer of 0.5%-3% and the solidifying agent of 1%-3%, material based on described material of main part and adding material, the weight ratio of described base mateiral and water is 1:5-7.Can when sieve tube completion water plugging of horizontal well, not pollution level section precise screen pipe, consolidation time is longer, moderate strength, high temperature resistant, thus reaches water blockoff and exploitation via steam injection once success.When horizontal section shutoff, the suspension of gel particle is good, good fluidity, sieving property are good, high temperature resistant, easily enter stratum, expense is low, thus reach that precise screen pipe horizontal well shutoff risk is low, validity period is long, shutoff success ratio is high.
The contrast table of the present invention and existing plugging agent
Below by embodiment, the present invention is described in further detail.
Embodiment
Embodiment 1
Gel particle type plugging agent: 90 kilograms of G class g cements, 10 kilograms of HPAM(anionic polyacrylamides), 1 kilogram of fine silt, 1 kilogram of calcium carbonate and 500 kg of water.
Preparation method: by above-mentioned addition, first mixes G class g cement with particle blocking agent, then adds reinforcer and solidifying agent mixes, and finally adds water and forms gel particle type plugging agent.
Gel particle type plugging agent dispersed time 20min, consolidation time 16h, intensity 2.1MPa, heatproof >180 DEG C that this formula is obtained.
Embodiment 2
Gel particle type plugging agent: 50 kilograms of G class g cements, 50 kilograms of ZT-PAM, 0.5 kilogram of natural earth, 3 kilograms of flyash and 600 kg of water.
Preparation method: by above-mentioned addition, first mixes G class g cement with particle blocking agent, then adds reinforcer and solidifying agent mixes, and finally adds water and forms gel particle type plugging agent.
Gel particle type plugging agent dispersed time 30min, consolidation time 14h, intensity 2.2MPa, heatproof >180 DEG C that this formula is obtained.
Embodiment 3
Gel particle type plugging agent: 70 kilograms of G class g cements, 30 kilograms of MH-PAM, 3 kilograms of natural earths, 2 kilograms of flyash and 700 kg of water.
Preparation method: by above-mentioned addition, first mixes G class g cement with particle blocking agent, then adds reinforcer and solidifying agent mixes, and finally adds water and forms gel particle type plugging agent.
Gel particle type plugging agent dispersed time 25min, consolidation time 15h, intensity 2.1MPa, heatproof >180 DEG C that this formula is obtained.
Embodiment 4
Gel particle type plugging agent: 60 kilograms of G class g cements, 40 kg of water varicosity PAM, 2 kilograms of natural earths, 1 kilogram of fine silica powder and 600 kg of water.
Preparation method: by above-mentioned addition, first mixes G class g cement with particle blocking agent, then adds reinforcer and solidifying agent mixes, and finally adds water and forms gel particle type plugging agent.
Gel particle type plugging agent dispersed time 25min, consolidation time 13h, intensity 2.3MPa, heatproof >180 DEG C that this formula is obtained.
Claims (2)
1. gel particle type plugging agent, it is characterized in that: be made up of material of main part, adding material and water, described material of main part is that the G class g cement of 50-90% and the particle blocking agent of 50-10% form by weight ratio, described adding material by account for material of main part weight percent be 0.5%-3% reinforcer and account for material of main part weight percent be 1%-3% solidifying agent form, material based on described material of main part and adding material, the weight ratio of described base mateiral and water is 1:5-7; Described solidifying agent is calcium carbonate, flyash or fine silica powder; Described reinforcer is calcium salt; Described particle blocking agent is anionic polyacrylamide, ZT-PAM, MH-PAM or hydroexpanding body PAM; Described calcium salt is fine silt or natural earth.
2. the preparation method of gel particle type plugging agent according to claim 1, it is characterized in that: by the addition of regulation, first G class g cement is mixed with particle blocking agent, then add reinforcer and solidifying agent mixes, finally add water and form gel particle type plugging agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192848.XA CN103484086B (en) | 2012-06-13 | 2012-06-13 | Gel particle type plugging agent and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192848.XA CN103484086B (en) | 2012-06-13 | 2012-06-13 | Gel particle type plugging agent and preparation method |
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| Publication Number | Publication Date |
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| CN103484086A CN103484086A (en) | 2014-01-01 |
| CN103484086B true CN103484086B (en) | 2016-04-13 |
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| CN201210192848.XA Expired - Fee Related CN103484086B (en) | 2012-06-13 | 2012-06-13 | Gel particle type plugging agent and preparation method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547591A (en) * | 2018-02-13 | 2018-09-18 | 中国石油天然气股份有限公司 | Water plugging method for screen pipe well completion thickened oil horizontal well |
| CN109439300B (en) | 2018-10-19 | 2019-11-01 | 中国石油大学(华东) | Adjust stream agent particle, adjust stream agent and its preparation method and application |
| CN110760296B (en) * | 2019-10-10 | 2021-09-28 | 陕西延长石油(集团)有限责任公司研究院 | Hybrid gel particle while-drilling plugging agent and preparation method thereof |
| CN113666686B (en) * | 2021-08-20 | 2022-07-22 | 西南石油大学 | Selective water shutoff agent and oil-gas field high-temperature-resistant high-pressure-resistant long-acting oil-stabilizing water-controlling method |
| CN116004201A (en) * | 2021-10-21 | 2023-04-25 | 中国石油化工股份有限公司 | High Wen Cai-resistant liquid sediment profile control water shutoff agent and preparation method thereof |
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| CN101863643A (en) * | 2010-05-24 | 2010-10-20 | 中国石油集团川庆钻探工程有限公司 | Hydrophobic gel composite cement and plugging method thereof |
| CN102010701A (en) * | 2009-09-04 | 2011-04-13 | 中国石油化工股份有限公司 | Oil-well cement additive for preventing corrosion of hydrogen sulfide as well as preparation method and application thereof |
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- 2012-06-13 CN CN201210192848.XA patent/CN103484086B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095402A (en) * | 1993-05-14 | 1994-11-23 | 大庆石油管理局采油工艺研究所 | Plugging agent for oil well |
| CN1464173A (en) * | 2002-06-14 | 2003-12-31 | 中国石油天然气股份有限公司 | Modified tannin extract gel water plugging technology suitable for high-temperature high-salt oil reservoir |
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| CN103484086A (en) | 2014-01-01 |
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Inventor after: Cui Xindong Inventor after: Liu Xiaoliang Inventor after: Yu Huili Inventor after: Wang Qian Inventor after: Zhao Hua Inventor after: Du Rui Inventor after: Zhang Xiusheng Inventor after: Sun Kai Inventor after: Dong Lixin Inventor after: Hu Zengguo Inventor after: Wan Huiping Inventor after: Bi Zhifeng Inventor after: Hu Yan Inventor after: Zheng Yuqing Inventor before: Cui Xindong Inventor before: Liu Xiaoliang Inventor before: Yu Huili Inventor before: Wang Qian Inventor before: Zhao Hua Inventor before: Du Rui Inventor before: Zhang Xiusheng Inventor before: Dong Lixin Inventor before: Hu Zengguo Inventor before: Wan Huiping Inventor before: Bi Zhifeng Inventor before: Sun Kai Inventor before: Hu Yan Inventor before: Zheng Yuqing |
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Free format text: CORRECT: INVENTOR; FROM: CUI XINDONG ZHANG XIUSHENG DONG LIXIN HU ZENGGUO WAN HUIPING BI ZHIFENG SUN KAI HU YAN ZHENG YUQING LIU XIAOLIANG YU HUILI WANG QIAN ZHAO HUA DU RUI TO: CUI XINDONG ZHANG XIUSHENG SUN KAI DONG LIXIN HU ZENGGUO WAN HUIPING BI ZHIFENG HU YAN ZHENG YUQING LIU XIAOLIANG YU HUILI WANG QIAN ZHAO HUA DU RUI |
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Inventor after: Zhang Dingyong Inventor after: Hu Yan Inventor after: Zheng Yuqing Inventor after: Liu Xiaoliang Inventor after: Yu Huili Inventor after: Wang Qian Inventor after: Zhao Huaihua Inventor after: Du Rui Inventor after: Zhang Xiusheng Inventor after: Cui Xindong Inventor after: Dong Lixin Inventor after: Hu Zengguo Inventor after: Wan Huiping Inventor after: Bi Zhifeng Inventor after: Zhang Xuejun Inventor after: Sun Kai Inventor before: Cui Xindong Inventor before: Liu Xiaoliang Inventor before: Yu Huili Inventor before: Wang Qian Inventor before: Zhao Hua Inventor before: Du Rui Inventor before: Zhang Xiusheng Inventor before: Sun Kai Inventor before: Dong Lixin Inventor before: Hu Zengguo Inventor before: Wan Huiping Inventor before: Bi Zhifeng Inventor before: Hu Yan Inventor before: Zheng Yuqing |
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Free format text: CORRECT: INVENTOR; FROM: CUI XINDONG ZHANG XIUSHENG SUN KAI DONG LIXIN HU ZENGGUO WAN HUIPING BI ZHIFENG HU YAN ZHENG YUQING LIU XIAOLIANG YU HUILI WANG QIAN ZHAO HUA DU RUI TO: ZHANG DINGYONG ZHANG XIUSHENG CUI XINDONG DONG LIXIN HU ZENGGUO WAN HUIPING BI ZHIFENG ZHANG XUEJUN SUN KAI HU YAN ZHENG YUQING LIU XIAOLIANG YU HUILI WANG QIAN ZHAO HUAIHUA DU RUI |
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