FR2375433A1 - Procede et appareil pour transmettre a distance des informations d'un trou de sonde a la surface - Google Patents
Procede et appareil pour transmettre a distance des informations d'un trou de sonde a la surfaceInfo
- Publication number
- FR2375433A1 FR2375433A1 FR7738610A FR7738610A FR2375433A1 FR 2375433 A1 FR2375433 A1 FR 2375433A1 FR 7738610 A FR7738610 A FR 7738610A FR 7738610 A FR7738610 A FR 7738610A FR 2375433 A1 FR2375433 A1 FR 2375433A1
- Authority
- FR
- France
- Prior art keywords
- transmitting information
- probe hole
- remotely transmitting
- borehole
- drill string
- 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
- 238000000034 method Methods 0.000 title abstract 2
- 239000000523 sample Substances 0.000 title 1
- 239000004020 conductor Substances 0.000 abstract 2
- 238000005553 drilling Methods 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/523—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases for use under water
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/14—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
L'invention concerne un procédé et un appareil pour transmettre les informations d'un trou de sonde à la surface pendant le forage. Un câble 15 contenant un conducteur électrique et maintenu tendu entre deux raccords d'ancrage inférieur 12 et supérieur 23 est utilisé pour transmettre les informations d'un raccord porte-instruments 11 situé au fond du puits à un niveau intermédiaire du train de tiges et une série de tiges de forage comprenant chacune un conducteur électrique isolé et des connecteurs électriques à chaque extrémité est utilisée pour transmettre les informations à surface. Le câble tendu peut être remonté à la surface sans qu'il soit nécessaire de retirer le train de tiges du trou de sonde. L'invention est applicable notamment au forage par rotation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/753,768 US4126848A (en) | 1976-12-23 | 1976-12-23 | Drill string telemeter system |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2375433A1 true FR2375433A1 (fr) | 1978-07-21 |
FR2375433B1 FR2375433B1 (fr) | 1987-04-17 |
Family
ID=25032078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7738610A Expired FR2375433B1 (fr) | 1976-12-23 | 1977-12-21 | Procede et appareil pour transmettre a distance des informations d'un trou de sonde a la surface |
Country Status (9)
Country | Link |
---|---|
US (1) | US4126848A (fr) |
AT (1) | AT353731B (fr) |
AU (1) | AU509714B2 (fr) |
BR (1) | BR7708497A (fr) |
CA (1) | CA1074292A (fr) |
DE (1) | DE2757085C2 (fr) |
FR (1) | FR2375433B1 (fr) |
GB (1) | GB1558300A (fr) |
NO (1) | NO149325C (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2388127A1 (fr) * | 1977-04-22 | 1978-11-17 | Shell Int Research | Organe d'accouplement de fond de puits pour systeme de telemesure d'un train de tiges de forage |
FR2395390A1 (fr) * | 1977-06-23 | 1979-01-19 | Shell Int Research | Ensemble tige d'entrainement-raccord d'usure avec moyens de telemesure utilisable avec un train de tubes de forage |
FR2522059A2 (fr) * | 1981-03-13 | 1983-08-26 | Inst Francais Du Petrole | Methode et dispositif pour effectuer, a l'aide d'outils specialises, des operations telles que des mesures, dans des portions de puits fortement inclinees sur la verticale, ou horizontales |
Families Citing this family (85)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1571677A (en) * | 1978-04-07 | 1980-07-16 | Shell Int Research | Pipe section for use in a borehole |
US4349072A (en) * | 1980-10-06 | 1982-09-14 | Schlumberger Technology Corporation | Method and apparatus for conducting logging or perforating operations in a borehole |
USRE32336E (en) * | 1980-10-06 | 1987-01-27 | Schlumberger Technology Corporation | Method and apparatus for conducting logging or perforating operations in a borehole |
FR2501777B1 (fr) | 1981-03-13 | 1986-08-29 | Inst Francais Du Petrole | Methode et dispositif pour effectuer, a l'aide d'outils specialises, des operations telles que des mesures, dans des portions de puits fortement inclinees sur la verticale, ou horizontales |
US4510797A (en) * | 1982-09-23 | 1985-04-16 | Schlumberger Technology Corporation | Full-bore drill stem testing apparatus with surface pressure readout |
US4697650A (en) * | 1984-09-24 | 1987-10-06 | Nl Industries, Inc. | Method for estimating formation characteristics of the exposed bottomhole formation |
US4683944A (en) * | 1985-05-06 | 1987-08-04 | Innotech Energy Corporation | Drill pipes and casings utilizing multi-conduit tubulars |
US4806928A (en) * | 1987-07-16 | 1989-02-21 | Schlumberger Technology Corporation | Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
US4862426A (en) * | 1987-12-08 | 1989-08-29 | Cameron Iron Works Usa, Inc. | Method and apparatus for operating equipment in a remote location |
TR25495A (tr) * | 1990-11-12 | 1993-05-01 | Menarini Farma Ind | YENI FLORO-NAFTASENDIYONLAR BUNLARIN GLUSILATLI TüREVLERI VE IMAL üSüLLERI |
US5160925C1 (en) * | 1991-04-17 | 2001-03-06 | Halliburton Co | Short hop communication link for downhole mwd system |
FR2679957B1 (fr) * | 1991-08-02 | 1998-12-04 | Inst Francais Du Petrole | Methode et dispositif pour effectuer des mesures et/ou interventions dans un puits fore ou en cours de forage. |
FR2679958B1 (fr) * | 1991-08-02 | 1997-06-27 | Inst Francais Du Petrole | Systeme, support pour effectuer des mesures ou interventions dans un puits fore ou en cours de forage, et leurs utilisations. |
FR2688026B1 (fr) * | 1992-02-27 | 1994-04-15 | Institut Francais Petrole | Systeme et methode d'acquisition de donnees physiques liees a un forage en cours. |
FR2688027B1 (fr) * | 1992-02-27 | 1994-04-15 | Institut Francais Petrole | Support et connecteur d'un cable interne a une conduite, systeme et methode de mesure. |
US6710600B1 (en) | 1994-08-01 | 2004-03-23 | Baker Hughes Incorporated | Drillpipe structures to accommodate downhole testing |
DE60009936D1 (de) * | 1999-10-29 | 2004-05-19 | Halliburton Energy Serv Inc | Vorrichtung und verfahren zur verlängerung einer elektromagnetischen antenne |
US6992554B2 (en) * | 2000-07-19 | 2006-01-31 | Intelliserv, Inc. | Data transmission element for downhole drilling components |
US7040003B2 (en) * | 2000-07-19 | 2006-05-09 | Intelliserv, Inc. | Inductive coupler for downhole components and method for making same |
US7098767B2 (en) * | 2000-07-19 | 2006-08-29 | Intelliserv, Inc. | Element for use in an inductive coupler for downhole drilling components |
CA2416053C (fr) | 2000-07-19 | 2008-11-18 | Novatek Engineering Inc. | Systeme de transmission de donnees pour fond de trou |
US6670880B1 (en) | 2000-07-19 | 2003-12-30 | Novatek Engineering, Inc. | Downhole data transmission system |
US6888473B1 (en) | 2000-07-20 | 2005-05-03 | Intelliserv, Inc. | Repeatable reference for positioning sensors and transducers in drill pipe |
US6866306B2 (en) | 2001-03-23 | 2005-03-15 | Schlumberger Technology Corporation | Low-loss inductive couplers for use in wired pipe strings |
US6641434B2 (en) | 2001-06-14 | 2003-11-04 | Schlumberger Technology Corporation | Wired pipe joint with current-loop inductive couplers |
US7105098B1 (en) | 2002-06-06 | 2006-09-12 | Sandia Corporation | Method to control artifacts of microstructural fabrication |
US6799632B2 (en) | 2002-08-05 | 2004-10-05 | Intelliserv, Inc. | Expandable metal liner for downhole components |
US7243717B2 (en) * | 2002-08-05 | 2007-07-17 | Intelliserv, Inc. | Apparatus in a drill string |
US6982384B2 (en) * | 2003-09-25 | 2006-01-03 | Intelliserv, Inc. | Load-resistant coaxial transmission line |
US7098802B2 (en) * | 2002-12-10 | 2006-08-29 | Intelliserv, Inc. | Signal connection for a downhole tool string |
US7224288B2 (en) * | 2003-07-02 | 2007-05-29 | Intelliserv, Inc. | Link module for a downhole drilling network |
US6830467B2 (en) * | 2003-01-31 | 2004-12-14 | Intelliserv, Inc. | Electrical transmission line diametrical retainer |
US7080998B2 (en) * | 2003-01-31 | 2006-07-25 | Intelliserv, Inc. | Internal coaxial cable seal system |
US6844498B2 (en) * | 2003-01-31 | 2005-01-18 | Novatek Engineering Inc. | Data transmission system for a downhole component |
US7852232B2 (en) * | 2003-02-04 | 2010-12-14 | Intelliserv, Inc. | Downhole tool adapted for telemetry |
US7096961B2 (en) * | 2003-04-29 | 2006-08-29 | Schlumberger Technology Corporation | Method and apparatus for performing diagnostics in a wellbore operation |
US6929493B2 (en) | 2003-05-06 | 2005-08-16 | Intelliserv, Inc. | Electrical contact for downhole drilling networks |
US20050001738A1 (en) * | 2003-07-02 | 2005-01-06 | Hall David R. | Transmission element for downhole drilling components |
US7053788B2 (en) * | 2003-06-03 | 2006-05-30 | Intelliserv, Inc. | Transducer for downhole drilling components |
US6913093B2 (en) * | 2003-05-06 | 2005-07-05 | Intelliserv, Inc. | Loaded transducer for downhole drilling components |
US6981546B2 (en) * | 2003-06-09 | 2006-01-03 | Intelliserv, Inc. | Electrical transmission line diametrical retention mechanism |
US20050001736A1 (en) * | 2003-07-02 | 2005-01-06 | Hall David R. | Clamp to retain an electrical transmission line in a passageway |
US6950034B2 (en) * | 2003-08-29 | 2005-09-27 | Schlumberger Technology Corporation | Method and apparatus for performing diagnostics on a downhole communication system |
US6991035B2 (en) * | 2003-09-02 | 2006-01-31 | Intelliserv, Inc. | Drilling jar for use in a downhole network |
US7019665B2 (en) * | 2003-09-02 | 2006-03-28 | Intelliserv, Inc. | Polished downhole transducer having improved signal coupling |
US20050074998A1 (en) * | 2003-10-02 | 2005-04-07 | Hall David R. | Tool Joints Adapted for Electrical Transmission |
US7040415B2 (en) * | 2003-10-22 | 2006-05-09 | Schlumberger Technology Corporation | Downhole telemetry system and method |
US20050093296A1 (en) * | 2003-10-31 | 2005-05-05 | Hall David R. | An Upset Downhole Component |
US7017667B2 (en) * | 2003-10-31 | 2006-03-28 | Intelliserv, Inc. | Drill string transmission line |
US6968611B2 (en) * | 2003-11-05 | 2005-11-29 | Intelliserv, Inc. | Internal coaxial cable electrical connector for use in downhole tools |
US6945802B2 (en) * | 2003-11-28 | 2005-09-20 | Intelliserv, Inc. | Seal for coaxial cable in downhole tools |
US20050115717A1 (en) * | 2003-11-29 | 2005-06-02 | Hall David R. | Improved Downhole Tool Liner |
US7291303B2 (en) * | 2003-12-31 | 2007-11-06 | Intelliserv, Inc. | Method for bonding a transmission line to a downhole tool |
US7367392B2 (en) * | 2004-01-08 | 2008-05-06 | Schlumberger Technology Corporation | Wellbore apparatus with sliding shields |
US7069999B2 (en) * | 2004-02-10 | 2006-07-04 | Intelliserv, Inc. | Apparatus and method for routing a transmission line through a downhole tool |
US7413021B2 (en) * | 2005-03-31 | 2008-08-19 | Schlumberger Technology Corporation | Method and conduit for transmitting signals |
US7543659B2 (en) * | 2005-06-15 | 2009-06-09 | Schlumberger Technology Corporation | Modular connector and method |
US7913774B2 (en) * | 2005-06-15 | 2011-03-29 | Schlumberger Technology Corporation | Modular connector and method |
US20070030167A1 (en) * | 2005-08-04 | 2007-02-08 | Qiming Li | Surface communication apparatus and method for use with drill string telemetry |
US7913773B2 (en) * | 2005-08-04 | 2011-03-29 | Schlumberger Technology Corporation | Bidirectional drill string telemetry for measuring and drilling control |
US20070063865A1 (en) * | 2005-09-16 | 2007-03-22 | Schlumberger Technology Corporation | Wellbore telemetry system and method |
US9109439B2 (en) * | 2005-09-16 | 2015-08-18 | Intelliserv, Llc | Wellbore telemetry system and method |
US7777644B2 (en) * | 2005-12-12 | 2010-08-17 | InatelliServ, LLC | Method and conduit for transmitting signals |
US7729860B2 (en) * | 2006-07-21 | 2010-06-01 | Schlumberger Technology Corporation | Drilling system powered by energy-harvesting sensor |
US20090173493A1 (en) * | 2006-08-03 | 2009-07-09 | Remi Hutin | Interface and method for transmitting information to and from a downhole tool |
MX2007008966A (es) * | 2006-12-29 | 2009-01-09 | Schlumberger Technology Bv | Sistema y metodo de telemetria de perforacion de pozos. |
US8072347B2 (en) * | 2006-12-29 | 2011-12-06 | Intelliserv, LLC. | Method and apparatus for locating faults in wired drill pipe |
US20100243242A1 (en) * | 2009-03-27 | 2010-09-30 | Boney Curtis L | Method for completing tight oil and gas reservoirs |
US8857510B2 (en) * | 2009-04-03 | 2014-10-14 | Schlumberger Technology Corporation | System and method for determining movement of a drilling component in a wellbore |
US9063250B2 (en) | 2009-08-18 | 2015-06-23 | Schlumberger Technology Corporation | Interference testing while drilling |
US8851175B2 (en) | 2009-10-20 | 2014-10-07 | Schlumberger Technology Corporation | Instrumented disconnecting tubular joint |
US8192213B2 (en) * | 2009-10-23 | 2012-06-05 | Intelliserv, Llc | Electrical conduction across interconnected tubulars |
US8362915B2 (en) | 2009-10-30 | 2013-01-29 | Intelliserv, Llc | System and method for determining stretch or compression of a drill string |
US8905159B2 (en) * | 2009-12-15 | 2014-12-09 | Schlumberger Technology Corporation | Eccentric steering device and methods of directional drilling |
US8727035B2 (en) | 2010-08-05 | 2014-05-20 | Schlumberger Technology Corporation | System and method for managing temperature in a wellbore |
CN102561969B (zh) * | 2011-12-28 | 2014-06-04 | 付吉平 | 轻便防遇阻式电缆带压下井输送装置 |
US9322223B2 (en) * | 2012-05-09 | 2016-04-26 | Rei, Inc. | Method and system for data-transfer via a drill pipe |
US10132123B2 (en) | 2012-05-09 | 2018-11-20 | Rei, Inc. | Method and system for data-transfer via a drill pipe |
US10301898B2 (en) | 2015-04-13 | 2019-05-28 | Schlumberger Technology Corporation | Top drive with top entry and line inserted therethrough for data gathering through the drill string |
US10753198B2 (en) | 2015-04-13 | 2020-08-25 | Schlumberger Technology Corporation | Downhole instrument for deep formation imaging deployed within a drill string |
WO2016168335A1 (fr) * | 2015-04-13 | 2016-10-20 | Schlumberger Technology Corporation | Ligne d'instrument multi-segment pour instrument d'un train de tiges |
WO2016168268A1 (fr) | 2015-04-13 | 2016-10-20 | Schlumberger Technology Corporation | Ligne d'instrument pour l'insertion dans un train de tiges de forage d'un système de forage |
US11296419B1 (en) | 2016-04-29 | 2022-04-05 | Rei, Inc. | Remote recessed reflector antenna and use thereof for sensing wear |
US10844668B2 (en) | 2018-11-09 | 2020-11-24 | National Oilwell Varco, L.P. | Self-aligning wet connection capable of orienting downhole tools |
AU2021340722B2 (en) * | 2020-09-11 | 2023-05-11 | Scientific Drilling International, Inc. | Lower electrode extension for sub-surface electromagnetic telemetry system |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2339274A (en) * | 1939-08-10 | 1944-01-18 | Sperry Sun Well Surveying Co | Electrical connecting means for well bore apparatus |
FR1244440A (fr) * | 1959-09-18 | 1960-10-28 | Câble de transmission utilisable lors du forage de puits | |
US3696332A (en) * | 1970-05-25 | 1972-10-03 | Shell Oil Co | Telemetering drill string with self-cleaning connectors |
US3807502A (en) * | 1973-04-12 | 1974-04-30 | Exxon Production Research Co | Method for installing an electric conductor in a drill string |
US3957118A (en) * | 1974-09-18 | 1976-05-18 | Exxon Production Research Company | Cable system for use in a pipe string and method for installing and using the same |
US4057781A (en) * | 1976-03-19 | 1977-11-08 | Scherbatskoy Serge Alexander | Well bore communication method |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2048156A5 (fr) * | 1969-06-03 | 1971-03-19 | Schlumberger Prospection | |
US3825078A (en) * | 1972-06-29 | 1974-07-23 | Exxon Production Research Co | Method of mounting and maintaining electric conductor in a drill string |
-
1976
- 1976-12-23 US US05/753,768 patent/US4126848A/en not_active Expired - Lifetime
-
1977
- 1977-12-21 AU AU31832/77A patent/AU509714B2/en not_active Expired
- 1977-12-21 FR FR7738610A patent/FR2375433B1/fr not_active Expired
- 1977-12-21 NO NO774396A patent/NO149325C/no unknown
- 1977-12-21 BR BR7708497A patent/BR7708497A/pt unknown
- 1977-12-21 CA CA293,620A patent/CA1074292A/fr not_active Expired
- 1977-12-21 DE DE2757085A patent/DE2757085C2/de not_active Expired
- 1977-12-21 AT AT919377A patent/AT353731B/de not_active IP Right Cessation
- 1977-12-21 GB GB53195/77A patent/GB1558300A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2339274A (en) * | 1939-08-10 | 1944-01-18 | Sperry Sun Well Surveying Co | Electrical connecting means for well bore apparatus |
FR1244440A (fr) * | 1959-09-18 | 1960-10-28 | Câble de transmission utilisable lors du forage de puits | |
US3696332A (en) * | 1970-05-25 | 1972-10-03 | Shell Oil Co | Telemetering drill string with self-cleaning connectors |
US3807502A (en) * | 1973-04-12 | 1974-04-30 | Exxon Production Research Co | Method for installing an electric conductor in a drill string |
US3957118A (en) * | 1974-09-18 | 1976-05-18 | Exxon Production Research Company | Cable system for use in a pipe string and method for installing and using the same |
US4057781A (en) * | 1976-03-19 | 1977-11-08 | Scherbatskoy Serge Alexander | Well bore communication method |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2388127A1 (fr) * | 1977-04-22 | 1978-11-17 | Shell Int Research | Organe d'accouplement de fond de puits pour systeme de telemesure d'un train de tiges de forage |
FR2395390A1 (fr) * | 1977-06-23 | 1979-01-19 | Shell Int Research | Ensemble tige d'entrainement-raccord d'usure avec moyens de telemesure utilisable avec un train de tubes de forage |
FR2522059A2 (fr) * | 1981-03-13 | 1983-08-26 | Inst Francais Du Petrole | Methode et dispositif pour effectuer, a l'aide d'outils specialises, des operations telles que des mesures, dans des portions de puits fortement inclinees sur la verticale, ou horizontales |
Also Published As
Publication number | Publication date |
---|---|
CA1074292A (fr) | 1980-03-25 |
BR7708497A (pt) | 1978-09-12 |
DE2757085C2 (de) | 1986-04-24 |
AT353731B (de) | 1979-11-26 |
ATA919377A (de) | 1979-05-15 |
NO149325C (no) | 1984-03-28 |
US4126848A (en) | 1978-11-21 |
GB1558300A (en) | 1979-12-19 |
DE2757085A1 (de) | 1978-07-06 |
NO774396L (no) | 1978-06-26 |
AU509714B2 (en) | 1980-05-22 |
FR2375433B1 (fr) | 1987-04-17 |
NO149325B (no) | 1983-12-19 |
AU3183277A (en) | 1979-06-28 |
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