CA1008359A - Methods and apparatus for testing earth formations - Google Patents

Methods and apparatus for testing earth formations

Info

Publication number
CA1008359A
CA1008359A CA215,201A CA215201A CA1008359A CA 1008359 A CA1008359 A CA 1008359A CA 215201 A CA215201 A CA 215201A CA 1008359 A CA1008359 A CA 1008359A
Authority
CA
Canada
Prior art keywords
methods
earth formations
testing earth
testing
formations
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.)
Expired
Application number
CA215,201A
Other versions
CA215201S (en
Inventor
Harold J. Urbanosky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger Canada Ltd
Original Assignee
Schlumberger Canada Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schlumberger Canada Ltd filed Critical Schlumberger Canada Ltd
Application granted granted Critical
Publication of CA1008359A publication Critical patent/CA1008359A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/10—Obtaining fluid samples or testing fluids, in boreholes or wells using side-wall fluid samplers or testers
CA215,201A 1973-12-12 1974-12-04 Methods and apparatus for testing earth formations Expired CA1008359A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US424122A US3859851A (en) 1973-12-12 1973-12-12 Methods and apparatus for testing earth formations

Publications (1)

Publication Number Publication Date
CA1008359A true CA1008359A (en) 1977-04-12

Family

ID=23681533

Family Applications (1)

Application Number Title Priority Date Filing Date
CA215,201A Expired CA1008359A (en) 1973-12-12 1974-12-04 Methods and apparatus for testing earth formations

Country Status (12)

Country Link
US (1) US3859851A (en)
JP (1) JPS5724479B2 (en)
BR (1) BR7410295A (en)
CA (1) CA1008359A (en)
EG (1) EG11678A (en)
FR (1) FR2254799B1 (en)
GB (1) GB1495284A (en)
IE (1) IE40125B1 (en)
IT (1) IT1049332B (en)
NL (1) NL180339C (en)
NO (1) NO144273C (en)
SU (1) SU1344256A3 (en)

Families Citing this family (139)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2558522B1 (en) * 1983-12-22 1986-05-02 Schlumberger Prospection DEVICE FOR COLLECTING A SAMPLE REPRESENTATIVE OF THE FLUID PRESENT IN A WELL, AND CORRESPONDING METHOD
US4742459A (en) * 1986-09-29 1988-05-03 Schlumber Technology Corp. Method and apparatus for determining hydraulic properties of formations surrounding a borehole
US4994671A (en) * 1987-12-23 1991-02-19 Schlumberger Technology Corporation Apparatus and method for analyzing the composition of formation fluids
US5201220A (en) * 1990-08-28 1993-04-13 Schlumberger Technology Corp. Apparatus and method for detecting the presence of gas in a borehole flow stream
US5167149A (en) * 1990-08-28 1992-12-01 Schlumberger Technology Corporation Apparatus and method for detecting the presence of gas in a borehole flow stream
US5233866A (en) * 1991-04-22 1993-08-10 Gulf Research Institute Apparatus and method for accurately measuring formation pressures
US5587525A (en) * 1992-06-19 1996-12-24 Western Atlas International, Inc. Formation fluid flow rate determination method and apparatus for electric wireline formation testing tools
US5266800A (en) * 1992-10-01 1993-11-30 Schlumberger Technology Corporation Method of distinguishing between crude oils
US5703286A (en) * 1995-10-20 1997-12-30 Halliburton Energy Services, Inc. Method of formation testing
DE69636665T2 (en) * 1995-12-26 2007-10-04 Halliburton Co., Dallas Apparatus and method for early assessment and maintenance of a well
US5859430A (en) * 1997-04-10 1999-01-12 Schlumberger Technology Corporation Method and apparatus for the downhole compositional analysis of formation gases
US5939717A (en) * 1998-01-29 1999-08-17 Schlumberger Technology Corporation Methods and apparatus for determining gas-oil ratio in a geological formation through the use of spectroscopy
US6388251B1 (en) 1999-01-12 2002-05-14 Baker Hughes, Inc. Optical probe for analysis of formation fluids
US6350986B1 (en) 1999-02-23 2002-02-26 Schlumberger Technology Corporation Analysis of downhole OBM-contaminated formation fluid
US6274865B1 (en) 1999-02-23 2001-08-14 Schlumberger Technology Corporation Analysis of downhole OBM-contaminated formation fluid
US6678616B1 (en) 1999-11-05 2004-01-13 Schlumberger Technology Corporation Method and tool for producing a formation velocity image data set
US6507401B1 (en) 1999-12-02 2003-01-14 Aps Technology, Inc. Apparatus and method for analyzing fluids
US6510389B1 (en) 2000-02-25 2003-01-21 Schlumberger Technology Corporation Acoustic detection of stress-induced mechanical damage in a borehole wall
GB2359631B (en) * 2000-02-26 2002-03-06 Schlumberger Holdings Hydrogen sulphide detection method and apparatus
GB2362469B (en) 2000-05-18 2004-06-30 Schlumberger Holdings Potentiometric sensor for wellbore applications
US6437326B1 (en) 2000-06-27 2002-08-20 Schlumberger Technology Corporation Permanent optical sensor downhole fluid analysis systems
US6476384B1 (en) 2000-10-10 2002-11-05 Schlumberger Technology Corporation Methods and apparatus for downhole fluids analysis
US6474152B1 (en) 2000-11-02 2002-11-05 Schlumberger Technology Corporation Methods and apparatus for optically measuring fluid compressibility downhole
US7025138B2 (en) 2000-12-08 2006-04-11 Schlumberger Technology Corporation Method and apparatus for hydrogen sulfide monitoring
US7095012B2 (en) * 2000-12-19 2006-08-22 Schlumberger Technology Corporation Methods and apparatus for determining chemical composition of reservoir fluids
US6465775B2 (en) 2000-12-19 2002-10-15 Schlumberger Technology Corporation Method of detecting carbon dioxide in a downhole environment
US6501072B2 (en) 2001-01-29 2002-12-31 Schlumberger Technology Corporation Methods and apparatus for determining precipitation onset pressure of asphaltenes
US6590647B2 (en) 2001-05-04 2003-07-08 Schlumberger Technology Corporation Physical property determination using surface enhanced raman emissions
US6581685B2 (en) 2001-09-25 2003-06-24 Schlumberger Technology Corporation Method for determining formation characteristics in a perforated wellbore
GB2381862A (en) 2001-11-10 2003-05-14 Schlumberger Holdings Fluid density measurement
US7028773B2 (en) * 2001-11-28 2006-04-18 Schlumberger Technology Coporation Assessing downhole WBM-contaminated connate water
US6729400B2 (en) 2001-11-28 2004-05-04 Schlumberger Technology Corporation Method for validating a downhole connate water sample
US7075062B2 (en) 2001-12-10 2006-07-11 Schlumberger Technology Corporation Apparatus and methods for downhole determination of characteristics of formation fluids
US6658930B2 (en) 2002-02-04 2003-12-09 Halliburton Energy Services, Inc. Metal pad for downhole formation testing
US6843118B2 (en) * 2002-03-08 2005-01-18 Halliburton Energy Services, Inc. Formation tester pretest using pulsed flow rate control
US6640625B1 (en) 2002-05-08 2003-11-04 Anthony R. H. Goodwin Method and apparatus for measuring fluid density downhole
CA2484927C (en) * 2002-05-17 2009-01-27 Halliburton Energy Services, Inc. Method and apparatus for mwd formation testing
BR0310096B1 (en) * 2002-05-17 2014-12-02 Halliburton Energy Serv Inc "TRAINING TEST TOOL, AND METHOD OF TESTING AN UNDERGROUND TRAINING".
US7075063B2 (en) * 2002-06-26 2006-07-11 Schlumberger Technology Corporation Determining phase transition pressure of downhole retrograde condensate
US7002142B2 (en) * 2002-06-26 2006-02-21 Schlumberger Technology Corporation Determining dew precipitation and onset pressure in oilfield retrograde condensate
CN1672032A (en) * 2002-06-26 2005-09-21 韦尔道格有限公司 In-situ detection and analysis of coal bed methane formations with optical instruments and methods and apparatus to facilitate methane production and analysis
US6964301B2 (en) * 2002-06-28 2005-11-15 Schlumberger Technology Corporation Method and apparatus for subsurface fluid sampling
US8555968B2 (en) * 2002-06-28 2013-10-15 Schlumberger Technology Corporation Formation evaluation system and method
US7178591B2 (en) * 2004-08-31 2007-02-20 Schlumberger Technology Corporation Apparatus and method for formation evaluation
US8210260B2 (en) * 2002-06-28 2012-07-03 Schlumberger Technology Corporation Single pump focused sampling
US8899323B2 (en) 2002-06-28 2014-12-02 Schlumberger Technology Corporation Modular pumpouts and flowline architecture
GB2391314B (en) * 2002-07-25 2005-08-10 Schlumberger Holdings Methods and apparatus for the measurement of hydrogen sulphide and thiols in fluids
US6832515B2 (en) * 2002-09-09 2004-12-21 Schlumberger Technology Corporation Method for measuring formation properties with a time-limited formation test
US7152466B2 (en) * 2002-11-01 2006-12-26 Schlumberger Technology Corporation Methods and apparatus for rapidly measuring pressure in earth formations
US7081615B2 (en) * 2002-12-03 2006-07-25 Schlumberger Technology Corporation Methods and apparatus for the downhole characterization of formation fluids
US7526953B2 (en) * 2002-12-03 2009-05-05 Schlumberger Technology Corporation Methods and apparatus for the downhole characterization of formation fluids
GB2397651B (en) * 2003-01-15 2005-08-24 Schlumberger Holdings Methods and apparatus for the measurement of hydrogen sulphide and thiols in fluids
US7216702B2 (en) 2003-02-28 2007-05-15 Yates Petroleum Corporation Methods of evaluating undersaturated coalbed methane reservoirs
DE602004012554T2 (en) * 2003-05-02 2009-04-16 Baker-Hughes Inc., Houston OPTICAL PROCESS AND ANALYZER
GB2404738B (en) * 2003-08-04 2005-09-28 Schlumberger Holdings System and method for sensing using diamond based microelectrodes
US8758593B2 (en) * 2004-01-08 2014-06-24 Schlumberger Technology Corporation Electrochemical sensor
GB2409902B (en) 2004-01-08 2006-04-19 Schlumberger Holdings Electro-chemical sensor
US7121338B2 (en) 2004-01-27 2006-10-17 Halliburton Energy Services, Inc Probe isolation seal pad
US7243537B2 (en) * 2004-03-01 2007-07-17 Halliburton Energy Services, Inc Methods for measuring a formation supercharge pressure
EA011219B1 (en) * 2004-03-17 2009-02-27 Бейкер Хьюз Инкорпорейтед A method and apparatus for downhole fluid analysis for reservoir fluid characterization
US7260985B2 (en) * 2004-05-21 2007-08-28 Halliburton Energy Services, Inc Formation tester tool assembly and methods of use
US7261168B2 (en) * 2004-05-21 2007-08-28 Halliburton Energy Services, Inc. Methods and apparatus for using formation property data
US7603897B2 (en) * 2004-05-21 2009-10-20 Halliburton Energy Services, Inc. Downhole probe assembly
US7216533B2 (en) * 2004-05-21 2007-05-15 Halliburton Energy Services, Inc. Methods for using a formation tester
GB2415047B (en) * 2004-06-09 2008-01-02 Schlumberger Holdings Electro-chemical sensor
US7458419B2 (en) * 2004-10-07 2008-12-02 Schlumberger Technology Corporation Apparatus and method for formation evaluation
US7114385B2 (en) * 2004-10-07 2006-10-03 Schlumberger Technology Corporation Apparatus and method for drawing fluid into a downhole tool
US7565835B2 (en) 2004-11-17 2009-07-28 Schlumberger Technology Corporation Method and apparatus for balanced pressure sampling
GB2420849B (en) * 2004-12-02 2007-06-27 Schlumberger Holdings Optical pH sensor
US20060198742A1 (en) * 2005-03-07 2006-09-07 Baker Hughes, Incorporated Downhole uses of piezoelectric motors
US7461547B2 (en) * 2005-04-29 2008-12-09 Schlumberger Technology Corporation Methods and apparatus of downhole fluid analysis
US7546885B2 (en) * 2005-05-19 2009-06-16 Schlumberger Technology Corporation Apparatus and method for obtaining downhole samples
US7279678B2 (en) * 2005-08-15 2007-10-09 Schlumber Technology Corporation Method and apparatus for composition analysis in a logging environment
US7392697B2 (en) * 2005-09-19 2008-07-01 Schlumberger Technology Corporation Apparatus for downhole fluids analysis utilizing micro electro mechanical system (MEMS) or other sensors
US7673679B2 (en) * 2005-09-19 2010-03-09 Schlumberger Technology Corporation Protective barriers for small devices
GB2430749B (en) * 2005-09-21 2007-11-28 Schlumberger Holdings Electro-chemical sensor
US20070108378A1 (en) * 2005-11-14 2007-05-17 Toru Terabayashi High pressure optical cell for a downhole optical fluid analyzer
US7609380B2 (en) * 2005-11-14 2009-10-27 Schlumberger Technology Corporation Real-time calibration for downhole spectrometer
US7428925B2 (en) 2005-11-21 2008-09-30 Schlumberger Technology Corporation Wellbore formation evaluation system and method
US7367394B2 (en) 2005-12-19 2008-05-06 Schlumberger Technology Corporation Formation evaluation while drilling
US20080087470A1 (en) 2005-12-19 2008-04-17 Schlumberger Technology Corporation Formation Evaluation While Drilling
US7379180B2 (en) * 2006-01-26 2008-05-27 Schlumberger Technology Corporation Method and apparatus for downhole spectral analysis of fluids
US7336356B2 (en) * 2006-01-26 2008-02-26 Schlumberger Technology Corporation Method and apparatus for downhole spectral analysis of fluids
US7511813B2 (en) * 2006-01-26 2009-03-31 Schlumberger Technology Corporation Downhole spectral analysis tool
US7445043B2 (en) * 2006-02-16 2008-11-04 Schlumberger Technology Corporation System and method for detecting pressure disturbances in a formation while performing an operation
DK2021768T3 (en) * 2006-06-01 2016-10-24 Shell Int Research The downhole tool to the time-domain analysis of the formation fluid and a related analytical method
US7878243B2 (en) * 2006-09-18 2011-02-01 Schlumberger Technology Corporation Method and apparatus for sampling high viscosity formation fluids
US7886825B2 (en) * 2006-09-18 2011-02-15 Schlumberger Technology Corporation Formation fluid sampling tools and methods utilizing chemical heating
US8016038B2 (en) * 2006-09-18 2011-09-13 Schlumberger Technology Corporation Method and apparatus to facilitate formation sampling
US7482811B2 (en) * 2006-11-10 2009-01-27 Schlumberger Technology Corporation Magneto-optical method and apparatus for determining properties of reservoir fluids
US20080111064A1 (en) * 2006-11-10 2008-05-15 Schlumberger Technology Corporation Downhole measurement of substances in earth formations
US20090159278A1 (en) * 2006-12-29 2009-06-25 Pierre-Yves Corre Single Packer System for Use in Heavy Oil Environments
US8162052B2 (en) 2008-01-23 2012-04-24 Schlumberger Technology Corporation Formation tester with low flowline volume and method of use thereof
US8496054B2 (en) 2007-01-17 2013-07-30 Schlumberger Technology Corporation Methods and apparatus to sample heavy oil in a subterranean formation
US7586087B2 (en) * 2007-01-24 2009-09-08 Schlumberger Technology Corporation Methods and apparatus to characterize stock-tank oil during fluid composition analysis
CN101680280B (en) * 2007-04-24 2013-06-12 韦尔泰克有限公司 Anchor tool
US7707878B2 (en) * 2007-09-20 2010-05-04 Schlumberger Technology Corporation Circulation pump for circulating downhole fluids, and characterization apparatus of downhole fluids
US7788972B2 (en) * 2007-09-20 2010-09-07 Schlumberger Technology Corporation Method of downhole characterization of formation fluids, measurement controller for downhole characterization of formation fluids, and apparatus for downhole characterization of formation fluids
US7520160B1 (en) * 2007-10-04 2009-04-21 Schlumberger Technology Corporation Electrochemical sensor
US20090160047A1 (en) * 2007-12-21 2009-06-25 Schlumberger Technology Corporation Downhole tool
US8297351B2 (en) 2007-12-27 2012-10-30 Schlumberger Technology Corporation Downhole sensing system using carbon nanotube FET
US8136395B2 (en) 2007-12-31 2012-03-20 Schlumberger Technology Corporation Systems and methods for well data analysis
US7920970B2 (en) * 2008-01-24 2011-04-05 Schlumberger Technology Corporation Methods and apparatus for characterization of petroleum fluid and applications thereof
US7822554B2 (en) * 2008-01-24 2010-10-26 Schlumberger Technology Corporation Methods and apparatus for analysis of downhole compositional gradients and applications thereof
US7996154B2 (en) * 2008-03-27 2011-08-09 Schlumberger Technology Corporation Methods and apparatus for analysis of downhole asphaltene gradients and applications thereof
US8434356B2 (en) 2009-08-18 2013-05-07 Schlumberger Technology Corporation Fluid density from downhole optical measurements
US8109157B2 (en) * 2008-06-30 2012-02-07 Schlumberger Technology Corporation Methods and apparatus of downhole fluids analysis
US7874355B2 (en) * 2008-07-02 2011-01-25 Schlumberger Technology Corporation Methods and apparatus for removing deposits on components in a downhole tool
US8499831B2 (en) * 2009-01-23 2013-08-06 Schlumberger Technology Corporation Mud cake probe extension apparatus and method
WO2010116250A2 (en) * 2009-04-10 2010-10-14 Schlumberger Technology B.V. Downhole sensor systems and methods thereof
CA2761819C (en) 2009-05-20 2016-09-27 Halliburton Energy Services, Inc. Downhole sensor tool for nuclear measurements
US9085964B2 (en) 2009-05-20 2015-07-21 Halliburton Energy Services, Inc. Formation tester pad
US9097100B2 (en) 2009-05-20 2015-08-04 Halliburton Energy Services, Inc. Downhole sensor tool with a sealed sensor outsert
US8607868B2 (en) * 2009-08-14 2013-12-17 Schlumberger Technology Corporation Composite micro-coil for downhole chemical delivery
US8483445B2 (en) 2010-09-29 2013-07-09 Schlumberger Technology Corporation Imaging methods and systems for downhole fluid analysis
US9429014B2 (en) 2010-09-29 2016-08-30 Schlumberger Technology Corporation Formation fluid sample container apparatus
GB2490117B (en) 2011-04-18 2014-04-09 Schlumberger Holdings Electrochemical pH sensor
FR2968348B1 (en) * 2010-12-03 2015-01-16 Total Sa METHOD OF MEASURING PRESSURE IN A SUBTERRANEAN FORMATION
US9052289B2 (en) 2010-12-13 2015-06-09 Schlumberger Technology Corporation Hydrogen sulfide (H2S) detection using functionalized nanoparticles
US8714254B2 (en) 2010-12-13 2014-05-06 Schlumberger Technology Corporation Method for mixing fluids downhole
US9097088B2 (en) 2010-12-15 2015-08-04 Schlumberger Technology Corporation Downhole tool thermal device
US8773125B2 (en) 2010-12-29 2014-07-08 Schlumberger Technology Corporation Microcoil NMR for downhole microfluidics platform
US9581019B2 (en) 2011-03-23 2017-02-28 Schlumberger Technology Corporation Measurement pretest drawdown methods and apparatus
US8708049B2 (en) 2011-04-29 2014-04-29 Schlumberger Technology Corporation Downhole mixing device for mixing a first fluid with a second fluid
US9714571B2 (en) 2011-12-02 2017-07-25 Schlumberger Technology Corporation Sampling tool with a multi-port multi-position valve
GB2497788B (en) 2011-12-21 2020-12-30 Schlumberger Holdings Derivatization of carbon
GB2497795B (en) 2011-12-21 2020-04-08 Schlumberger Holdings Derivatization of carbon
GB2497791B (en) 2011-12-21 2021-01-20 Schlumberger Holdings Derivatization of carbon
US9435200B2 (en) 2012-02-02 2016-09-06 Schlumberger Technology Corporation Determination of thermodynamic properties of a fluid based on density and sound speed
US10294783B2 (en) 2012-10-23 2019-05-21 Halliburton Energy Services, Inc. Selectable size sampling apparatus, systems, and methods
US9291027B2 (en) 2013-01-25 2016-03-22 Schlumberger Technology Corporation Packer and packer outer layer
WO2015095646A1 (en) * 2013-12-19 2015-06-25 Schlumberger Canada Limited Guard filtering system for focused sampling probe
EA201792358A1 (en) 2015-04-27 2018-08-31 Верчуэл Флуид Мониторинг Сервисиз Ллк SYSTEMS, DEVICES AND METHODS FOR ANALYSIS AND MONITORING OF FLOW ENVIRONMENT
US10591388B2 (en) 2015-04-27 2020-03-17 Virtual Fluid Monitoring Services LLC Fluid analysis and monitoring using optical spectroscopy
AR104574A1 (en) 2016-05-09 2017-08-02 Juan Morgan Enrique UNDERGROUND TOOL THAT PROVIDES ON-LINE INFORMATION NECESSARY TO EVALUATE IN SITU QUALITY AND FLOW RATE
US11442019B2 (en) 2018-06-19 2022-09-13 Virtual Fluid Monitoring Services, Llc Fluid analysis and monitoring using optical spectroscopy
CN109116411B (en) * 2018-08-30 2019-11-12 东北大学 Microseismic sensors are fixed and recyclable device in a kind of hole suitable for different pore size
US11085294B2 (en) * 2018-11-30 2021-08-10 Halliburton Energy Services, Inc. Mud filtrate property measurement for downhole contamination assessment
EP3663509A1 (en) * 2018-12-06 2020-06-10 Welltec A/S Downhole tool with long projecting extension

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611799A (en) * 1969-10-01 1971-10-12 Dresser Ind Multiple chamber earth formation fluid sampler
US3677081A (en) * 1971-06-16 1972-07-18 Amoco Prod Co Sidewall well-formation fluid sampler

Also Published As

Publication number Publication date
NO744301L (en) 1975-07-07
JPS5724479B2 (en) 1982-05-24
JPS5092201A (en) 1975-07-23
NL180339C (en) 1987-02-02
NL180339B (en) 1986-09-01
US3859851A (en) 1975-01-14
FR2254799B1 (en) 1978-06-23
NO144273B (en) 1981-04-21
GB1495284A (en) 1977-12-14
AU7558874A (en) 1976-05-27
FR2254799A1 (en) 1975-07-11
NO144273C (en) 1981-07-29
IE40125B1 (en) 1979-03-14
IT1049332B (en) 1981-01-20
IE40125L (en) 1975-06-12
SU1344256A3 (en) 1987-10-07
NL7415504A (en) 1975-06-16
EG11678A (en) 1977-09-30
BR7410295A (en) 1976-06-29

Similar Documents

Publication Publication Date Title
CA1008359A (en) Methods and apparatus for testing earth formations
CA989726A (en) Methods and apparatus for testing earth formations
CA1009570A (en) Methods and apparatus for testing earth formations composed of particles of various sizes
CA995657A (en) Earth drilling apparatus and method
CA989728A (en) Methods and apparatus for testing earth formations
AU496828B2 (en) Method and apparatus for investigating earth formations
CA1013667A (en) Apparatus for testing earth formations composed of particles of various sizes
CA937505A (en) Method and apparatus for testing wells
CA1000358A (en) Method and apparatus for determining electromagnetic characteristics of earth formations
AU461284B2 (en) High resolution geochemical prospecting method and apparatus
CA926466A (en) Methods and apparatus for investigating earth formations
CA988029A (en) Apparatus for testing earth formations
AU466407B2 (en) Geological exploration method and apparatus
CA1000967A (en) Shock-absorber test method and apparatus
CA1009381A (en) Neutron lifetime well logging methods and apparatus
CA937285A (en) Methods and apparatus for investigating earth formations
CA985265A (en) Well drilling apparatus and method
CA1014259A (en) Methods and apparatus for recording well logging measurements
CA931071A (en) Method and apparatus for testing well formations
CA959569A (en) Apparatus for use in investigating earth formations
AU476441B2 (en) Method and apparatus for determining electromagnetic characteristics of earth formations
AU493049B2 (en) Methods and apparatus for testing earth formations
AU481733B2 (en) Methods and apparatus for testing earth formations
CA957275A (en) Subsurface well apparatus and method
CA903844A (en) Methods and apparatus for investigating earth formations