NO823414L - Fremgangsmaate og middel for surgjoering av olje- eller gassbroenner. - Google Patents
Fremgangsmaate og middel for surgjoering av olje- eller gassbroenner.Info
- Publication number
- NO823414L NO823414L NO823414A NO823414A NO823414L NO 823414 L NO823414 L NO 823414L NO 823414 A NO823414 A NO 823414A NO 823414 A NO823414 A NO 823414A NO 823414 L NO823414 L NO 823414L
- Authority
- NO
- Norway
- Prior art keywords
- alcohol
- surfactant
- phosphate ester
- acid
- volume
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 23
- 238000001356 surgical procedure Methods 0.000 title 1
- 239000004094 surface-active agent Substances 0.000 claims description 111
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 106
- 239000000203 mixture Substances 0.000 claims description 76
- -1 polybutylene Polymers 0.000 claims description 67
- 239000002253 acid Substances 0.000 claims description 52
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 49
- 239000000654 additive Substances 0.000 claims description 48
- 229910019142 PO4 Inorganic materials 0.000 claims description 47
- 239000010452 phosphate Substances 0.000 claims description 47
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 claims description 46
- 230000000996 additive effect Effects 0.000 claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000003929 acidic solution Substances 0.000 claims description 35
- 230000015572 biosynthetic process Effects 0.000 claims description 25
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 11
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 claims description 10
- 150000002009 diols Chemical class 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- 229920001748 polybutylene Polymers 0.000 claims description 5
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 4
- 229920001451 polypropylene glycol Polymers 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical group 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 150000004665 fatty acids Chemical group 0.000 claims description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims 2
- WTEVQBCEXWBHNA-UHFFFAOYSA-N Citral Natural products CC(C)=CCCC(C)=CC=O WTEVQBCEXWBHNA-UHFFFAOYSA-N 0.000 claims 1
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical group N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 claims 1
- 239000013543 active substance Substances 0.000 claims 1
- 229940043350 citral Drugs 0.000 claims 1
- 238000005188 flotation Methods 0.000 claims 1
- WTEVQBCEXWBHNA-JXMROGBWSA-N geranial Chemical compound CC(C)=CCC\C(C)=C\C=O WTEVQBCEXWBHNA-JXMROGBWSA-N 0.000 claims 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 239000000243 solution Substances 0.000 description 73
- 239000003921 oil Substances 0.000 description 53
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 48
- 239000012141 concentrate Substances 0.000 description 32
- 239000000839 emulsion Substances 0.000 description 32
- 150000001298 alcohols Chemical class 0.000 description 26
- 238000005755 formation reaction Methods 0.000 description 23
- 239000010802 sludge Substances 0.000 description 20
- 238000002347 injection Methods 0.000 description 17
- 239000007924 injection Substances 0.000 description 17
- 239000006185 dispersion Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 238000007792 addition Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 14
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 13
- 239000007787 solid Substances 0.000 description 13
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 description 12
- 239000012071 phase Substances 0.000 description 10
- 238000011282 treatment Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 238000005063 solubilization Methods 0.000 description 9
- 230000007928 solubilization Effects 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 150000007513 acids Chemical class 0.000 description 8
- 239000003129 oil well Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 239000006260 foam Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000003085 diluting agent Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000020477 pH reduction Effects 0.000 description 5
- 150000003014 phosphoric acid esters Chemical class 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000006184 cosolvent Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 4
- 230000003381 solubilizing effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 230000001976 improved effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000010494 opalescence Effects 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- 229960002171 tiocarlide Drugs 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 229920002260 Pluraflo® Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 229920000847 nonoxynol Polymers 0.000 description 2
- 239000004533 oil dispersion Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 101150002885 Avil gene Proteins 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- AQMHNCQZLQUNJI-UHFFFAOYSA-N [CH2]CCCCCC Chemical compound [CH2]CCCCCC AQMHNCQZLQUNJI-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000008052 alkyl sulfonates Chemical class 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000007046 ethoxylation reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229960002050 hydrofluoric acid Drugs 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 235000015927 pasta Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001983 poloxamer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000000080 wetting agent Substances 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Colloid Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Medicines Containing Plant Substances (AREA)
- Lubricants (AREA)
- Fats And Perfumes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31089981A | 1981-10-13 | 1981-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO823414L true NO823414L (no) | 1983-04-14 |
Family
ID=23204565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO823414A NO823414L (no) | 1981-10-13 | 1982-10-13 | Fremgangsmaate og middel for surgjoering av olje- eller gassbroenner. |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5880090A (ja) |
| AU (1) | AU549130B2 (ja) |
| BR (1) | BR8205964A (ja) |
| DE (1) | DE3237766A1 (ja) |
| FR (1) | FR2514364B1 (ja) |
| GB (1) | GB2109034B (ja) |
| IT (1) | IT1189386B (ja) |
| NL (1) | NL8203952A (ja) |
| NO (1) | NO823414L (ja) |
| PH (1) | PH19371A (ja) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4676916A (en) * | 1985-12-02 | 1987-06-30 | Basf Corporation | Acidizing concentrates for oil well acidizing systems |
| US4886609A (en) * | 1987-10-09 | 1989-12-12 | Gaf Corporation | Method for stimulation of oil and gas wells |
| WO2008084227A1 (en) * | 2007-01-12 | 2008-07-17 | Halliburton Energy Services, Inc. | Surfactant wash treatment fluids and associated methods |
| US8220548B2 (en) | 2007-01-12 | 2012-07-17 | Halliburton Energy Services Inc. | Surfactant wash treatment fluids and associated methods |
| US7906464B2 (en) | 2008-05-13 | 2011-03-15 | Halliburton Energy Services, Inc. | Compositions and methods for the removal of oil-based filtercakes |
| US7833943B2 (en) | 2008-09-26 | 2010-11-16 | Halliburton Energy Services Inc. | Microemulsifiers and methods of making and using same |
| US11739251B2 (en) * | 2020-04-14 | 2023-08-29 | ExxonMobil Technology and Engineering Company | Solvent mixtures for downhole elemental sulfur removal and formation stimulation |
| US11492540B1 (en) * | 2020-04-14 | 2022-11-08 | Exxonmobil Upstream Research Company | Solvent mixtures for downhole elemental sulfur removal and formation stimulation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3724544A (en) * | 1971-06-21 | 1973-04-03 | Texaco Inc | Secondary recovery method |
| US3704751A (en) * | 1971-06-21 | 1972-12-05 | Texaco Inc | Method for stimulating well production |
| US3738425A (en) * | 1971-08-04 | 1973-06-12 | Dow Chemical Co | Stabilization of water sensitive clays |
| FR2480620A1 (fr) * | 1980-04-18 | 1981-10-23 | Elf Aquitaine | Procede de preparation de microemulsions entre une phase acide et une phase hydrophobe |
-
1982
- 1982-10-12 PH PH27975A patent/PH19371A/en unknown
- 1982-10-12 DE DE19823237766 patent/DE3237766A1/de not_active Withdrawn
- 1982-10-12 FR FR8217093A patent/FR2514364B1/fr not_active Expired
- 1982-10-12 GB GB08229051A patent/GB2109034B/en not_active Expired
- 1982-10-13 NO NO823414A patent/NO823414L/no unknown
- 1982-10-13 AU AU89336/82A patent/AU549130B2/en not_active Ceased
- 1982-10-13 BR BR8205964A patent/BR8205964A/pt unknown
- 1982-10-13 IT IT49266/82A patent/IT1189386B/it active
- 1982-10-13 NL NL8203952A patent/NL8203952A/nl not_active Application Discontinuation
- 1982-10-13 JP JP57179697A patent/JPS5880090A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5880090A (ja) | 1983-05-14 |
| GB2109034A (en) | 1983-05-25 |
| NL8203952A (nl) | 1983-05-02 |
| IT1189386B (it) | 1988-02-04 |
| GB2109034B (en) | 1985-12-11 |
| FR2514364A1 (fr) | 1983-04-15 |
| PH19371A (en) | 1986-04-02 |
| AU8933682A (en) | 1983-04-21 |
| AU549130B2 (en) | 1986-01-16 |
| DE3237766A1 (de) | 1983-05-19 |
| FR2514364B1 (fr) | 1987-12-24 |
| IT8249266A0 (it) | 1982-10-13 |
| BR8205964A (pt) | 1983-09-13 |
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