DK0903591T3 - Fremgangsmåde og anordning til måling af resistiviteten af en jordformation - Google Patents
Fremgangsmåde og anordning til måling af resistiviteten af en jordformationInfo
- Publication number
- DK0903591T3 DK0903591T3 DK98307520T DK98307520T DK0903591T3 DK 0903591 T3 DK0903591 T3 DK 0903591T3 DK 98307520 T DK98307520 T DK 98307520T DK 98307520 T DK98307520 T DK 98307520T DK 0903591 T3 DK0903591 T3 DK 0903591T3
- Authority
- DK
- Denmark
- Prior art keywords
- resistivity
- measuring
- soil formation
- soil
- formation
- Prior art date
Links
- 238000000034 method Methods 0.000 title 1
- 238000004181 pedogenesis Methods 0.000 title 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
- G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
-
- 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)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Geochemistry & Mineralogy (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5955497P | 1997-09-19 | 1997-09-19 | |
US09/148,013 US6188222B1 (en) | 1997-09-19 | 1998-09-04 | Method and apparatus for measuring resistivity of an earth formation |
Publications (1)
Publication Number | Publication Date |
---|---|
DK0903591T3 true DK0903591T3 (da) | 2003-06-23 |
Family
ID=26738893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK98307520T DK0903591T3 (da) | 1997-09-19 | 1998-09-16 | Fremgangsmåde og anordning til måling af resistiviteten af en jordformation |
Country Status (8)
Country | Link |
---|---|
US (1) | US6188222B1 (da) |
EP (1) | EP0903591B1 (da) |
AU (1) | AU750364B2 (da) |
DE (1) | DE69815240T2 (da) |
DK (1) | DK0903591T3 (da) |
ID (1) | ID21091A (da) |
NO (1) | NO984301L (da) |
SA (1) | SA99190985B1 (da) |
Families Citing this family (83)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9818875D0 (en) | 1998-08-28 | 1998-10-21 | Norske Stats Oljeselskap | Method and apparatus for determining the nature of subterranean reservoirs |
US7659722B2 (en) * | 1999-01-28 | 2010-02-09 | Halliburton Energy Services, Inc. | Method for azimuthal resistivity measurement and bed boundary detection |
GB0002422D0 (en) | 2000-02-02 | 2000-03-22 | Norske Stats Oljeselskap | Method and apparatus for determining the nature of subterranean reservoirs |
EP1143105A1 (en) * | 2000-04-04 | 2001-10-10 | Schlumberger Holdings Limited | Directional drilling system |
DK1309887T4 (da) * | 2000-08-14 | 2017-10-16 | Electromagnetic Geoservices Asa | Fremgangsmåde og apparat til at bestemme beskaffenheden af underjordiske reservoirer |
GB0101919D0 (en) * | 2001-01-25 | 2001-03-07 | Geolink Uk Ltd | Induction logging antenna |
US6866306B2 (en) * | 2001-03-23 | 2005-03-15 | Schlumberger Technology Corporation | Low-loss inductive couplers for use in wired pipe strings |
CA2455388A1 (en) * | 2001-08-03 | 2003-03-27 | Baker Hughes Incorporated | A method and apparatus for a multi-component induction instrument measuring system |
US6677756B2 (en) | 2001-08-03 | 2004-01-13 | Baker Hughes Incorporated | Multi-component induction instrument |
GB2378511B (en) * | 2001-08-07 | 2005-12-28 | Statoil Asa | Method and apparatus for determining the nature of subterranean reservoirs |
GB2383133A (en) | 2001-08-07 | 2003-06-18 | Statoil Asa | Investigation of subterranean reservoirs |
WO2003042719A1 (en) * | 2001-11-13 | 2003-05-22 | Weatherford/Lamb, Inc. | A borehole compensation system and method for a resistivity logging tool |
US6504478B1 (en) * | 2001-11-27 | 2003-01-07 | J. Y. Richard Yen | Earth stratum flush monitoring method and a system thereof |
GB2382875B (en) * | 2001-12-07 | 2004-03-03 | Univ Southampton | Electromagnetic surveying for hydrocarbon reservoirs |
US6819110B2 (en) * | 2002-03-26 | 2004-11-16 | Schlumberger Technology Corporation | Electromagnetic resistivity logging instrument with transverse magnetic dipole component antennas providing axially extended response |
GB2385923B (en) | 2002-05-24 | 2004-07-28 | Statoil Asa | System and method for electromagnetic wavefield resolution |
US7093672B2 (en) * | 2003-02-11 | 2006-08-22 | Schlumberger Technology Corporation | Systems for deep resistivity while drilling for proactive geosteering |
GB2399640B (en) | 2003-03-17 | 2007-02-21 | Statoil Asa | Method and apparatus for determining the nature of submarine reservoirs |
US7027922B2 (en) * | 2003-08-25 | 2006-04-11 | Baker Hughes Incorporated | Deep resistivity transient method for MWD applications using asymptotic filtering |
US7170423B2 (en) | 2003-08-27 | 2007-01-30 | Weatherford Canada Partnership | Electromagnetic MWD telemetry system incorporating a current sensing transformer |
US7046009B2 (en) * | 2003-12-24 | 2006-05-16 | Baker Hughes Incorporated | Method for measuring transient electromagnetic components to perform deep geosteering while drilling |
GB2409900B (en) | 2004-01-09 | 2006-05-24 | Statoil Asa | Processing seismic data representing a physical system |
US7080699B2 (en) * | 2004-01-29 | 2006-07-25 | Schlumberger Technology Corporation | Wellbore communication system |
US7150316B2 (en) * | 2004-02-04 | 2006-12-19 | Baker Hughes Incorporated | Method of eliminating conductive drill parasitic influence on the measurements of transient electromagnetic components in MWD tools |
US7719282B2 (en) * | 2004-04-14 | 2010-05-18 | Baker Hughes Incorporated | Method and apparatus for mulit-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells |
US7755361B2 (en) * | 2004-07-14 | 2010-07-13 | Schlumberger Technology Corporation | Apparatus and system for well placement and reservoir characterization |
US8736270B2 (en) * | 2004-07-14 | 2014-05-27 | Schlumberger Technology Corporation | Look ahead logging system |
US7825664B2 (en) * | 2004-07-14 | 2010-11-02 | Schlumberger Technology Corporation | Resistivity tool with selectable depths of investigation |
US7786733B2 (en) * | 2004-07-14 | 2010-08-31 | Schlumberger Technology Corporation | Apparatus and system for well placement and reservoir characterization |
GB0418382D0 (en) * | 2004-08-18 | 2004-09-22 | Reed Hycalog Uk Ltd | Rotary drill bit |
US7249636B2 (en) * | 2004-12-09 | 2007-07-31 | Schlumberger Technology Corporation | System and method for communicating along a wellbore |
GB2422673B (en) * | 2005-02-01 | 2010-03-24 | Electromagnetic Geoservices As | Optimum signal for sea bed logging |
US7495446B2 (en) * | 2005-08-23 | 2009-02-24 | Schlumberger Technology Corporation | Formation evaluation system and method |
US7477162B2 (en) * | 2005-10-11 | 2009-01-13 | Schlumberger Technology Corporation | Wireless electromagnetic telemetry system and method for bottomhole assembly |
US7612567B2 (en) * | 2005-12-29 | 2009-11-03 | Baker Hughes Incorporated | Two-axial pad formation resistivity imager |
US7365545B2 (en) * | 2005-12-29 | 2008-04-29 | Baker Hughes Incorporated | Two-axial pad formation resistivity imager |
GB2434868B (en) | 2006-02-06 | 2010-05-12 | Statoil Asa | Method of conducting a seismic survey |
GB2435693A (en) * | 2006-02-09 | 2007-09-05 | Electromagnetic Geoservices As | Seabed electromagnetic surveying |
GB2439378B (en) * | 2006-06-09 | 2011-03-16 | Electromagnetic Geoservices As | Instrument for measuring electromagnetic signals |
CA2655200C (en) | 2006-07-11 | 2013-12-03 | Halliburton Energy Services, Inc. | Modular geosteering tool assembly |
US7557492B2 (en) | 2006-07-24 | 2009-07-07 | Halliburton Energy Services, Inc. | Thermal expansion matching for acoustic telemetry system |
US7595737B2 (en) * | 2006-07-24 | 2009-09-29 | Halliburton Energy Services, Inc. | Shear coupled acoustic telemetry system |
WO2008021868A2 (en) | 2006-08-08 | 2008-02-21 | Halliburton Energy Services, Inc. | Resistivty logging with reduced dip artifacts |
US7427862B2 (en) * | 2006-09-29 | 2008-09-23 | Baker Hughes Incorporated | Increasing the resolution of electromagnetic tools for resistivity evaluations in near borehole zones |
GB2442749B (en) | 2006-10-12 | 2010-05-19 | Electromagnetic Geoservices As | Positioning system |
CN1996053B (zh) * | 2006-11-23 | 2010-12-08 | 浙江工业大学 | 基于全方位视觉的泥石流灾害检测装置 |
CN101460698B (zh) | 2006-12-15 | 2013-01-02 | 哈里伯顿能源服务公司 | 具有旋转天线结构的天线耦合元件测量工具 |
US8031081B2 (en) * | 2006-12-28 | 2011-10-04 | Schlumberger Technology Corporation | Wireless telemetry between wellbore tools |
US7782060B2 (en) * | 2006-12-28 | 2010-08-24 | Schlumberger Technology Corporation | Integrated electrode resistivity and EM telemetry tool |
GB2445582A (en) | 2007-01-09 | 2008-07-16 | Statoil Asa | Method for analysing data from an electromagnetic survey |
WO2008136789A1 (en) * | 2007-05-01 | 2008-11-13 | Halliburton Energy Services, Inc. | Look-ahead boundary detection and distance measurement |
CN101932955B (zh) * | 2007-08-27 | 2014-12-03 | 普拉德研究及开发股份有限公司 | 先行测井系统 |
WO2009149038A2 (en) * | 2008-06-06 | 2009-12-10 | Schlumberger Canada Limited | Systems and methods for providing wireless power transmissions and tuning a transmission frequency |
CN102439260A (zh) * | 2008-12-16 | 2012-05-02 | 哈利伯顿能源服务公司 | 方位近钻头电阻率和地质导向方法及系统 |
US20100213943A1 (en) * | 2009-02-23 | 2010-08-26 | Baker Hughes Incorporated | Method for accentuating signal from ahead of the bit |
CN102725479A (zh) | 2009-10-20 | 2012-10-10 | 普拉德研究及开发股份有限公司 | 用于地层的特征化、导航钻探路径以及在地下钻井中布置井的方法 |
NO20100691A1 (no) * | 2010-05-12 | 2011-11-14 | Roxar Flow Measurement As | Overforings-system for kommunikasjon mellom borehullselementer |
CN103080777B (zh) * | 2010-08-26 | 2016-08-10 | 史密斯运输股份有限公司 | 用于在非导电性钻井液中微电阻率成像的设备和方法 |
US9043153B2 (en) * | 2011-03-15 | 2015-05-26 | Schlumberger Technology Corporation | Maximum depth of investigation of measurements in a formation |
US20120272174A1 (en) * | 2011-04-21 | 2012-10-25 | National Oilwell Varco, L.P. | System and method for drilling a borehole using streaming reference data |
CN103827433B (zh) * | 2011-08-03 | 2016-08-31 | 哈利伯顿能源服务公司 | 使井坐落于目标地带中的装置和方法 |
US9732608B2 (en) | 2013-02-25 | 2017-08-15 | Evolution Engineering Inc. | Downhole telemetry |
US9291049B2 (en) | 2013-02-25 | 2016-03-22 | Evolution Engineering Inc. | Downhole electromagnetic and mud pulse telemetry apparatus |
US9605535B2 (en) | 2013-02-25 | 2017-03-28 | Evolution Engineering Inc. | Integrated downhole system with plural telemetry subsystems |
WO2014205130A2 (en) * | 2013-06-18 | 2014-12-24 | Well Resolutions Technology | Apparatus and methods for communicating downhole data |
EP3011368B1 (en) | 2013-06-18 | 2021-08-04 | Well Resolutions Technology | Modular resistivity sensor for downhole measurement while drilling |
DE112014007031T5 (de) * | 2014-12-31 | 2017-07-20 | Halliburton Energy Services, Inc. | Verbesserung der Geosteering-Inversion unter Verwendung von einem elektromagnetischen Look-Ahead-Look-Around-Werkzeug |
US9784097B2 (en) | 2015-03-30 | 2017-10-10 | Baker Hughes Incorporated | Compressed telemetry for time series downhole data using variable scaling and grouped words |
US9983329B2 (en) * | 2015-06-05 | 2018-05-29 | Halliburton Energy Services, Inc. | Sensor system for downhole galvanic measurements |
US10100634B2 (en) * | 2015-09-18 | 2018-10-16 | Baker Hughes, A Ge Company, Llc | Devices and methods to communicate information from below a surface cement plug in a plugged or abandoned well |
PL3153285T3 (pl) * | 2015-10-06 | 2018-10-31 | Sandvik Intellectual Property Ab | Obrotowe urządzenie do cięcia z wbudowaną jednostką monitorującą |
WO2017074295A1 (en) | 2015-10-26 | 2017-05-04 | Halliburton Energy Services, Inc. | Frequency ratiometric processing of resistivity logging tool data |
CA3000149C (en) | 2015-11-04 | 2020-09-22 | Halliburton Energy Services, Inc. | Conductivity-depth transforms of electromagnetic telemetry signals |
WO2017142937A1 (en) * | 2016-02-19 | 2017-08-24 | Scientific Drilling International, Inc. | Sub-surface electromagnetic telemetry systems and methods |
US10190412B2 (en) | 2016-05-11 | 2019-01-29 | Halliburton Energy Services, Inc. | Determining subterranean-formation resistivity using an electromagnetic telemetry system |
CN110005398B (zh) * | 2019-04-04 | 2024-03-22 | 中国石油大学(北京) | 随钻电磁波电阻率测井仪器设计参数确定方法及装置 |
WO2021035255A1 (en) * | 2019-08-19 | 2021-02-25 | Schlumberger Technology Corporation | Conveyance apparatus, systems, and methods |
US11434753B2 (en) | 2019-10-14 | 2022-09-06 | Halliburton Energy Services, Inc. | Faraday shield |
CN111992779A (zh) * | 2020-08-25 | 2020-11-27 | 杭州彩兔贸易有限公司 | 一种航天航空模具打孔精度检测设备 |
CN112034257B (zh) * | 2020-09-11 | 2023-09-29 | 斯伦贝谢油田技术(山东)有限公司 | 一种井下电阻率的计算方法 |
US11713651B2 (en) | 2021-05-11 | 2023-08-01 | Saudi Arabian Oil Company | Heating a formation of the earth while drilling a wellbore |
US11802827B2 (en) | 2021-12-01 | 2023-10-31 | Saudi Arabian Oil Company | Single stage MICP measurement method and apparatus |
US12049807B2 (en) | 2021-12-02 | 2024-07-30 | Saudi Arabian Oil Company | Removing wellbore water |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3967201A (en) | 1974-01-25 | 1976-06-29 | Develco, Inc. | Wireless subterranean signaling method |
US4363137A (en) | 1979-07-23 | 1982-12-07 | Occidental Research Corporation | Wireless telemetry with magnetic induction field |
GB8531368D0 (en) | 1985-12-20 | 1986-02-05 | Misson P | Data transmission system |
JPS63160430A (ja) | 1986-12-24 | 1988-07-04 | Reideitsuku:Kk | 電磁誘導信号伝送方式 |
US5157605A (en) * | 1987-04-27 | 1992-10-20 | Schlumberger Technology Corporation | Induction logging method and apparatus including means for combining on-phase and quadrature components of signals received at varying frequencies and including use of multiple receiver means associated with a single transmitter |
US4899112A (en) | 1987-10-30 | 1990-02-06 | Schlumberger Technology Corporation | Well logging apparatus and method for determining formation resistivity at a shallow and a deep depth |
CA2024061C (en) | 1990-08-27 | 2001-10-02 | Laurier Emile Comeau | System for drilling deviated boreholes |
US5117927A (en) | 1991-02-01 | 1992-06-02 | Anadrill | Downhole adjustable bent assemblies |
US5160925C1 (en) | 1991-04-17 | 2001-03-06 | Halliburton Co | Short hop communication link for downhole mwd system |
US5410303A (en) | 1991-05-15 | 1995-04-25 | Baroid Technology, Inc. | System for drilling deivated boreholes |
US5235285A (en) * | 1991-10-31 | 1993-08-10 | Schlumberger Technology Corporation | Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations |
US5339037A (en) | 1992-10-09 | 1994-08-16 | Schlumberger Technology Corporation | Apparatus and method for determining the resistivity of earth formations |
NO306522B1 (no) | 1992-01-21 | 1999-11-15 | Anadrill Int Sa | Fremgangsmaate for akustisk overföring av maalesignaler ved maaling under boring |
US5375098A (en) | 1992-08-21 | 1994-12-20 | Schlumberger Technology Corporation | Logging while drilling tools, systems, and methods capable of transmitting data at a plurality of different frequencies |
GB2292869B (en) | 1994-09-03 | 1999-01-06 | Integrated Drilling Serv Ltd | A well data telemetry system |
US5594343A (en) | 1994-12-02 | 1997-01-14 | Schlumberger Technology Corporation | Well logging apparatus and method with borehole compensation including multiple transmitting antennas asymmetrically disposed about a pair of receiving antennas |
US5646611B1 (en) | 1995-02-24 | 2000-03-21 | Halliburton Co | System and method for indirectly determining inclination at the bit |
WO1997027502A1 (en) | 1996-01-26 | 1997-07-31 | Baker Hughes Incorporated | A drilling system with an acoustic measurement-while-drilling system for determining parameters of interest and controlling the drilling direction |
US5725061A (en) | 1996-05-24 | 1998-03-10 | Applied Technologies Associates, Inc. | Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path |
US5883516A (en) * | 1996-07-31 | 1999-03-16 | Scientific Drilling International | Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring |
-
1998
- 1998-09-04 US US09/148,013 patent/US6188222B1/en not_active Expired - Lifetime
- 1998-09-16 EP EP98307520A patent/EP0903591B1/en not_active Expired - Lifetime
- 1998-09-16 DK DK98307520T patent/DK0903591T3/da active
- 1998-09-16 DE DE69815240T patent/DE69815240T2/de not_active Expired - Fee Related
- 1998-09-16 AU AU85163/98A patent/AU750364B2/en not_active Ceased
- 1998-09-17 NO NO984301A patent/NO984301L/no not_active Application Discontinuation
- 1998-09-18 ID IDP981252A patent/ID21091A/id unknown
-
1999
- 1999-01-11 SA SA99190985A patent/SA99190985B1/ar unknown
Also Published As
Publication number | Publication date |
---|---|
EP0903591B1 (en) | 2003-06-04 |
ID21091A (id) | 1999-04-15 |
AU750364B2 (en) | 2002-07-18 |
NO984301D0 (no) | 1998-09-17 |
DE69815240T2 (de) | 2004-05-06 |
EP0903591A2 (en) | 1999-03-24 |
DE69815240D1 (de) | 2003-07-10 |
EP0903591A3 (en) | 2001-10-10 |
NO984301L (no) | 1999-03-22 |
SA99190985B1 (ar) | 2006-03-25 |
US6188222B1 (en) | 2001-02-13 |
AU8516398A (en) | 1999-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK0903591T3 (da) | Fremgangsmåde og anordning til måling af resistiviteten af en jordformation | |
DK0759563T3 (da) | Anordning og fremgangsmåde til måling af resistiviteten af underjordiske formationer | |
NO984087D0 (no) | Metode og apparat for innf¾ring av loggeinstrument gjennom en jordformasjon | |
NO983366D0 (no) | FremgangsmÕte og anordning for bestemmelse av banen til borehull | |
DK0975855T3 (da) | Fremgangsmåde og apparat, der benytter en kombination af fluidindsprøjtning og resistivitetsmålinger | |
NO970769D0 (no) | Anordning og fremgangsmåte for prövetaking av en jordformasjon | |
NO963663L (no) | Fremgangsmåte og anordning for måling av resistivitet | |
NO980604D0 (no) | Fremgangsmåte og anordning for komplettering av en underjordisk brönn | |
NO980603D0 (no) | Fremgangsmåte og anordning for komplettering av en underjordisk brönn | |
DK0881354T3 (da) | Fremgangsmåde og apparat til cementering af en brønd | |
NO980602D0 (no) | Fremgangsmåte og anordning for komplettering av en underjordisk brönn | |
NO980605D0 (no) | Fremgangsmåter og anordning for komplettering av underjordisk brönn | |
NO20005872D0 (no) | Fremgangsmåte og apparat for plassering av gjenstander på havbunnen | |
DK0973996T3 (da) | Fremgangsmåde og indretning til overvågning nede i et borehul | |
NO980591D0 (no) | Fremgangsmåte og anordning for komplettering av en underjordisk brönn | |
IS5564A (is) | Aðferð og búnaður til vigtunar | |
DK0802854T3 (da) | Præget subsrat og fotoreceptorindretning, der indbefatter dette, og fremgangsmåde | |
NO984753D0 (no) | FremgangsmÕte og anordning for mÕling inneholdende en halvstiv forlengelse | |
DK0810327T3 (da) | Fremgangsmåde og apparat til anlægning af underjordiske kontinuerte vægge | |
NO20002216D0 (no) | FremgangsmÕte og anordning for Õ fastslÕ kjennetegnene til en geologisk formasjon | |
DK0384823T3 (da) | Fremgangsmåde og anordning til at måle resistiviteten af geologiske formationer | |
DK0478409T3 (da) | Registreringsmetode og -apparat til måling af jordformationers modstand | |
DK0940078T3 (da) | Fremgangsmåde og anordning til bestemmelse af fisks vandringsperioder | |
DK0913708T3 (da) | Elektromagnetisk signalopsamlingsapparat og fremgangsmåde til brug af samme | |
NO990791D0 (no) | FremgangsmÕte og anordning for permanent overvÕkning av en undergrunnsformasjon |