FR2438152A1 - Procede de traitement d'une formation souterraine et balles d'obturation des perforations d'un tubage traversant une telle formation - Google Patents
Procede de traitement d'une formation souterraine et balles d'obturation des perforations d'un tubage traversant une telle formationInfo
- Publication number
- FR2438152A1 FR2438152A1 FR7917197A FR7917197A FR2438152A1 FR 2438152 A1 FR2438152 A1 FR 2438152A1 FR 7917197 A FR7917197 A FR 7917197A FR 7917197 A FR7917197 A FR 7917197A FR 2438152 A1 FR2438152 A1 FR 2438152A1
- Authority
- FR
- France
- Prior art keywords
- formation
- balls
- tubing
- treating
- polyurethane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 title 2
- 238000000034 method Methods 0.000 title 1
- 238000007789 sealing Methods 0.000 title 1
- 239000007788 liquid Substances 0.000 abstract 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 abstract 1
- 239000000806 elastomer Substances 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000003180 well treatment fluid Substances 0.000 abstract 1
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- 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
-
- 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
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
- E21B27/02—Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
-
- 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2998—Coated including synthetic resin or polymer
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Incineration Of Waste (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
L'INVENTION CONCERNE DES BALLES D'OBTURATION EN POLYURETHANNE DESTINEES A DES OPERATIONS DE DERIVATION DE FLUIDES DE TRAITEMENT DE PUITS. CHAQUE BALLE D'OBTURATION COMPREND UN NOYAU PLEIN REVETU D'UN ELASTOMERE DU TYPE POLYURETHANNE. DANS UNE FORME PREFEREE DE REALISATION, LES BALLES D'OBTURATION SONT UTILISEES DANS UN LIQUIDE HYDROCARBONE DE TRAITEMENT ET LEUR DENSITE EST INFERIEURE A CELLE DE CE LIQUIDE. DOMAINE D'APPLICATION: TRAITEMENT DE PUITS DE PETROLE, DE GAZ, ETC.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US92141378A | 1978-07-03 | 1978-07-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2438152A1 true FR2438152A1 (fr) | 1980-04-30 |
FR2438152B1 FR2438152B1 (fr) | 1984-02-03 |
Family
ID=25445393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7917197A Granted FR2438152A1 (fr) | 1978-07-03 | 1979-07-03 | Procede de traitement d'une formation souterraine et balles d'obturation des perforations d'un tubage traversant une telle formation |
Country Status (10)
Country | Link |
---|---|
US (1) | US4407368A (fr) |
AU (1) | AU528482B2 (fr) |
CA (1) | CA1114737A (fr) |
DE (1) | DE2924610A1 (fr) |
FR (1) | FR2438152A1 (fr) |
GB (1) | GB2025485B (fr) |
MX (1) | MX153376A (fr) |
MY (1) | MY8500114A (fr) |
NL (1) | NL7905187A (fr) |
NO (1) | NO792181L (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2483003A1 (fr) * | 1980-05-20 | 1981-11-27 | Exxon Research Engineering Co | Procede pour obturer selectivement des perforations dans un tubage de puits devie |
Families Citing this family (81)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4410387A (en) * | 1980-02-27 | 1983-10-18 | Molded Dimensions Inc. | Ball sealers and method of preparation |
US4387769A (en) * | 1981-08-10 | 1983-06-14 | Exxon Production Research Co. | Method for reducing the permeability of subterranean formations |
US4505334A (en) * | 1983-09-06 | 1985-03-19 | Oil States Industries, Inc. | Ball sealer |
US4753295A (en) * | 1984-11-19 | 1988-06-28 | Exxon Production Research Company | Method for placing ball sealers onto casing perforations in a deviated portion of a wellbore |
US4702318A (en) * | 1986-04-09 | 1987-10-27 | Mobil Oil Corporation | Injectivity profile in CO2 injection wells via ball sealers |
US4702316A (en) * | 1986-01-03 | 1987-10-27 | Mobil Oil Corporation | Injectivity profile in steam injection wells via ball sealers |
BR8604808A (pt) * | 1986-10-03 | 1988-05-17 | Petroleo Brasileiro S.A. - Petrobras | Sistema mecanico e processo para diversificacao em operacao de acidificacao de formacoes produtoras de petroleo |
GB8715835D0 (en) * | 1987-07-06 | 1987-08-12 | Balmoral Group | Coating of syntactic articles |
US5253709A (en) * | 1990-01-29 | 1993-10-19 | Conoco Inc. | Method and apparatus for sealing pipe perforations |
CA2049974A1 (fr) * | 1990-01-29 | 1991-07-30 | Larry N. Kendrick | Methode et dispositif permettant d'obturer les perforations dans les tuyaux |
DE4206331A1 (de) * | 1991-03-05 | 1992-09-10 | Exxon Production Research Co | Kugelabdichtungen und verwendung derselben zur bohrlochbehandlung |
US5485882A (en) * | 1994-10-27 | 1996-01-23 | Exxon Production Research Company | Low-density ball sealer for use as a diverting agent in hostile environment wells |
US8403037B2 (en) | 2009-12-08 | 2013-03-26 | Baker Hughes Incorporated | Dissolvable tool and method |
US9682425B2 (en) * | 2009-12-08 | 2017-06-20 | Baker Hughes Incorporated | Coated metallic powder and method of making the same |
US9109429B2 (en) * | 2002-12-08 | 2015-08-18 | Baker Hughes Incorporated | Engineered powder compact composite material |
US9079246B2 (en) * | 2009-12-08 | 2015-07-14 | Baker Hughes Incorporated | Method of making a nanomatrix powder metal compact |
DE102004043948A1 (de) * | 2003-09-27 | 2005-05-25 | Dynaenergetics Gmbh & Co. Kg | Perforationskanonensystem mit selbstverschließenden Durchschusslöchern |
US7066266B2 (en) * | 2004-04-16 | 2006-06-27 | Key Energy Services | Method of treating oil and gas wells |
US7273104B2 (en) * | 2004-07-30 | 2007-09-25 | Key Energy Services, Inc. | Method of pumping an “in-the-formation” diverting agent in a lateral section of an oil and gas well |
US7647964B2 (en) * | 2005-12-19 | 2010-01-19 | Fairmount Minerals, Ltd. | Degradable ball sealers and methods for use in well treatment |
US8714250B2 (en) * | 2007-10-18 | 2014-05-06 | Schlumberger Technology Corporation | Multilayered ball sealer and method of use thereof |
US9212535B2 (en) * | 2008-04-15 | 2015-12-15 | Schlumberger Technology Corporation | Diversion by combining dissolvable and degradable particles and fibers |
US8936085B2 (en) | 2008-04-15 | 2015-01-20 | Schlumberger Technology Corporation | Sealing by ball sealers |
US8561696B2 (en) | 2008-11-18 | 2013-10-22 | Schlumberger Technology Corporation | Method of placing ball sealers for fluid diversion |
CA2744068A1 (fr) * | 2008-11-20 | 2010-05-27 | Udoka Obi | Procede et appareil de scellement etanche |
GB0906541D0 (en) * | 2009-04-16 | 2009-05-20 | Brinker Technology Ltd | Delivery method and compositions |
US9243475B2 (en) | 2009-12-08 | 2016-01-26 | Baker Hughes Incorporated | Extruded powder metal compact |
US10240419B2 (en) | 2009-12-08 | 2019-03-26 | Baker Hughes, A Ge Company, Llc | Downhole flow inhibition tool and method of unplugging a seat |
US8528633B2 (en) | 2009-12-08 | 2013-09-10 | Baker Hughes Incorporated | Dissolvable tool and method |
US9127515B2 (en) | 2010-10-27 | 2015-09-08 | Baker Hughes Incorporated | Nanomatrix carbon composite |
US9227243B2 (en) | 2009-12-08 | 2016-01-05 | Baker Hughes Incorporated | Method of making a powder metal compact |
US9090955B2 (en) | 2010-10-27 | 2015-07-28 | Baker Hughes Incorporated | Nanomatrix powder metal composite |
US8631876B2 (en) | 2011-04-28 | 2014-01-21 | Baker Hughes Incorporated | Method of making and using a functionally gradient composite tool |
US9080098B2 (en) | 2011-04-28 | 2015-07-14 | Baker Hughes Incorporated | Functionally gradient composite article |
US9139928B2 (en) | 2011-06-17 | 2015-09-22 | Baker Hughes Incorporated | Corrodible downhole article and method of removing the article from downhole environment |
US9707739B2 (en) | 2011-07-22 | 2017-07-18 | Baker Hughes Incorporated | Intermetallic metallic composite, method of manufacture thereof and articles comprising the same |
US8783365B2 (en) | 2011-07-28 | 2014-07-22 | Baker Hughes Incorporated | Selective hydraulic fracturing tool and method thereof |
US9643250B2 (en) | 2011-07-29 | 2017-05-09 | Baker Hughes Incorporated | Method of controlling the corrosion rate of alloy particles, alloy particle with controlled corrosion rate, and articles comprising the particle |
US9833838B2 (en) | 2011-07-29 | 2017-12-05 | Baker Hughes, A Ge Company, Llc | Method of controlling the corrosion rate of alloy particles, alloy particle with controlled corrosion rate, and articles comprising the particle |
US9057242B2 (en) | 2011-08-05 | 2015-06-16 | Baker Hughes Incorporated | Method of controlling corrosion rate in downhole article, and downhole article having controlled corrosion rate |
US9033055B2 (en) | 2011-08-17 | 2015-05-19 | Baker Hughes Incorporated | Selectively degradable passage restriction and method |
US20130048282A1 (en) * | 2011-08-23 | 2013-02-28 | David M. Adams | Fracturing Process to Enhance Propping Agent Distribution to Maximize Connectivity Between the Formation and the Wellbore |
US9856547B2 (en) | 2011-08-30 | 2018-01-02 | Bakers Hughes, A Ge Company, Llc | Nanostructured powder metal compact |
US9109269B2 (en) | 2011-08-30 | 2015-08-18 | Baker Hughes Incorporated | Magnesium alloy powder metal compact |
US9090956B2 (en) | 2011-08-30 | 2015-07-28 | Baker Hughes Incorporated | Aluminum alloy powder metal compact |
US9643144B2 (en) | 2011-09-02 | 2017-05-09 | Baker Hughes Incorporated | Method to generate and disperse nanostructures in a composite material |
US9187990B2 (en) | 2011-09-03 | 2015-11-17 | Baker Hughes Incorporated | Method of using a degradable shaped charge and perforating gun system |
US9133695B2 (en) | 2011-09-03 | 2015-09-15 | Baker Hughes Incorporated | Degradable shaped charge and perforating gun system |
US9347119B2 (en) | 2011-09-03 | 2016-05-24 | Baker Hughes Incorporated | Degradable high shock impedance material |
US9010416B2 (en) | 2012-01-25 | 2015-04-21 | Baker Hughes Incorporated | Tubular anchoring system and a seat for use in the same |
US9068428B2 (en) | 2012-02-13 | 2015-06-30 | Baker Hughes Incorporated | Selectively corrodible downhole article and method of use |
US9605508B2 (en) | 2012-05-08 | 2017-03-28 | Baker Hughes Incorporated | Disintegrable and conformable metallic seal, and method of making the same |
US9920585B2 (en) * | 2013-05-21 | 2018-03-20 | Halliburton Energy Services, Inc. | Syntactic foam frac ball and methods of using same |
WO2014189766A2 (fr) * | 2013-05-21 | 2014-11-27 | Halliburton Energy Services, Inc. | Bille de fracturation en mousse syntactique et ses procédés d'utilisation |
US9617841B2 (en) | 2013-05-29 | 2017-04-11 | Marvin Boedeker | Hydraulic fracturing ball sealers |
US9816339B2 (en) | 2013-09-03 | 2017-11-14 | Baker Hughes, A Ge Company, Llc | Plug reception assembly and method of reducing restriction in a borehole |
CA2933148C (fr) * | 2013-12-26 | 2017-01-10 | Kureha Corporation | Bille d'obturation pour la recuperation de ressources en hydrocarbures, son procede de fabrication et procede de traitement de fond de trou l'utilisant |
US10865465B2 (en) | 2017-07-27 | 2020-12-15 | Terves, Llc | Degradable metal matrix composite |
WO2015127174A1 (fr) | 2014-02-21 | 2015-08-27 | Terves, Inc. | Système métallique de désintégration à activation par fluide |
US11167343B2 (en) | 2014-02-21 | 2021-11-09 | Terves, Llc | Galvanically-active in situ formed particles for controlled rate dissolving tools |
US9910026B2 (en) | 2015-01-21 | 2018-03-06 | Baker Hughes, A Ge Company, Llc | High temperature tracers for downhole detection of produced water |
US10415344B2 (en) * | 2015-02-27 | 2019-09-17 | Schlumberger Technology Corporation | Technique and apparatus for using an untethered object to form a seal in a well |
US10378303B2 (en) | 2015-03-05 | 2019-08-13 | Baker Hughes, A Ge Company, Llc | Downhole tool and method of forming the same |
US9567824B2 (en) | 2015-04-28 | 2017-02-14 | Thru Tubing Solutions, Inc. | Fibrous barriers and deployment in subterranean wells |
US10513653B2 (en) | 2015-04-28 | 2019-12-24 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US9816341B2 (en) * | 2015-04-28 | 2017-11-14 | Thru Tubing Solutions, Inc. | Plugging devices and deployment in subterranean wells |
US10233719B2 (en) | 2015-04-28 | 2019-03-19 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US9567826B2 (en) | 2015-04-28 | 2017-02-14 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US9567825B2 (en) | 2015-04-28 | 2017-02-14 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US10641069B2 (en) | 2015-04-28 | 2020-05-05 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US9708883B2 (en) | 2015-04-28 | 2017-07-18 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US10774612B2 (en) | 2015-04-28 | 2020-09-15 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US9745820B2 (en) | 2015-04-28 | 2017-08-29 | Thru Tubing Solutions, Inc. | Plugging device deployment in subterranean wells |
US11851611B2 (en) | 2015-04-28 | 2023-12-26 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
US10221637B2 (en) | 2015-08-11 | 2019-03-05 | Baker Hughes, A Ge Company, Llc | Methods of manufacturing dissolvable tools via liquid-solid state molding |
US10016810B2 (en) | 2015-12-14 | 2018-07-10 | Baker Hughes, A Ge Company, Llc | Methods of manufacturing degradable tools using a galvanic carrier and tools manufactured thereof |
US9920589B2 (en) | 2016-04-06 | 2018-03-20 | Thru Tubing Solutions, Inc. | Methods of completing a well and apparatus therefor |
US10760370B2 (en) | 2016-12-16 | 2020-09-01 | MicroPlug, LLC | Micro frac plug |
GB201707552D0 (en) * | 2017-05-11 | 2017-06-28 | Qinov8 Uk | Sealing element |
US10808162B2 (en) | 2017-11-17 | 2020-10-20 | Fairmount Santrol Inc. | Crush resistant buoyant ball sealers |
WO2020081621A1 (fr) * | 2018-10-18 | 2020-04-23 | Terves Llc | Inverseurs et joints d'étanchéité déformables dégradables |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3010514A (en) * | 1957-10-09 | 1961-11-28 | Socony Mobil Oil Co Inc | Oil well cementing |
US3011197A (en) * | 1957-07-18 | 1961-12-05 | Mobay Chemical Corp | Pipeline cleaning devices |
DE1139453B (de) * | 1959-12-30 | 1962-11-15 | Dow Chemical Co | Verfahren zur Behandlung von Bohrloechern |
US3174546A (en) * | 1962-08-29 | 1965-03-23 | Pan American Petroleum Corp | Method for selectively sealing-off formations |
US3437147A (en) * | 1967-02-23 | 1969-04-08 | Mobil Oil Corp | Method and apparatus for plugging well pipe perforations |
GB1319094A (en) * | 1970-11-18 | 1973-05-31 | Knapp M M M | Pipeline pig and associated apparatus |
US4102401A (en) * | 1977-09-06 | 1978-07-25 | Exxon Production Research Company | Well treatment fluid diversion with low density ball sealers |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2754910A (en) * | 1955-04-27 | 1956-07-17 | Chemical Process Company | Method of temporarily closing perforations in the casing |
US2933136A (en) * | 1957-04-04 | 1960-04-19 | Dow Chemical Co | Well treating method |
US4139060A (en) * | 1977-11-14 | 1979-02-13 | Exxon Production Research Company | Selective wellbore isolation using buoyant ball sealers |
-
1978
- 1978-07-03 US US05/921,413 patent/US4407368A/en not_active Expired - Lifetime
-
1979
- 1979-06-06 CA CA329,205A patent/CA1114737A/fr not_active Expired
- 1979-06-13 AU AU48020/79A patent/AU528482B2/en not_active Expired
- 1979-06-19 DE DE19792924610 patent/DE2924610A1/de not_active Withdrawn
- 1979-06-28 NO NO792181A patent/NO792181L/no unknown
- 1979-06-29 GB GB7922734A patent/GB2025485B/en not_active Expired
- 1979-07-03 MX MX178323A patent/MX153376A/es unknown
- 1979-07-03 FR FR7917197A patent/FR2438152A1/fr active Granted
- 1979-07-03 NL NL7905187A patent/NL7905187A/nl not_active Application Discontinuation
-
1985
- 1985-12-30 MY MY114/85A patent/MY8500114A/xx unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3011197A (en) * | 1957-07-18 | 1961-12-05 | Mobay Chemical Corp | Pipeline cleaning devices |
US3010514A (en) * | 1957-10-09 | 1961-11-28 | Socony Mobil Oil Co Inc | Oil well cementing |
DE1139453B (de) * | 1959-12-30 | 1962-11-15 | Dow Chemical Co | Verfahren zur Behandlung von Bohrloechern |
US3174546A (en) * | 1962-08-29 | 1965-03-23 | Pan American Petroleum Corp | Method for selectively sealing-off formations |
US3437147A (en) * | 1967-02-23 | 1969-04-08 | Mobil Oil Corp | Method and apparatus for plugging well pipe perforations |
GB1319094A (en) * | 1970-11-18 | 1973-05-31 | Knapp M M M | Pipeline pig and associated apparatus |
US4102401A (en) * | 1977-09-06 | 1978-07-25 | Exxon Production Research Company | Well treatment fluid diversion with low density ball sealers |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2483003A1 (fr) * | 1980-05-20 | 1981-11-27 | Exxon Research Engineering Co | Procede pour obturer selectivement des perforations dans un tubage de puits devie |
Also Published As
Publication number | Publication date |
---|---|
GB2025485A (en) | 1980-01-23 |
NO792181L (no) | 1980-01-04 |
DE2924610A1 (de) | 1980-01-24 |
GB2025485B (en) | 1982-09-15 |
AU528482B2 (en) | 1983-04-28 |
FR2438152B1 (fr) | 1984-02-03 |
US4407368A (en) | 1983-10-04 |
NL7905187A (nl) | 1980-01-07 |
MY8500114A (en) | 1985-12-31 |
MX153376A (es) | 1986-10-07 |
AU4802079A (en) | 1980-01-10 |
CA1114737A (fr) | 1981-12-22 |
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