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CA2232654A1 - Nmr well logging apparatus and method - Google Patents

Nmr well logging apparatus and method

Info

Publication number
CA2232654A1
CA2232654A1 CA 2232654 CA2232654A CA2232654A1 CA 2232654 A1 CA2232654 A1 CA 2232654A1 CA 2232654 CA2232654 CA 2232654 CA 2232654 A CA2232654 A CA 2232654A CA 2232654 A1 CA2232654 A1 CA 2232654A1
Authority
CA
Canada
Prior art keywords
magnetic field
sector
radio frequency
nuclei
wellbore
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
Application number
CA 2232654
Other languages
French (fr)
Other versions
CA2232654C (en
Inventor
Gersh Taicher (Zvi)
Arcady Reiderman
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.)
Western Atlas International Inc
Original Assignee
Western Atlas International Inc
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
Priority claimed from US08/960,498 external-priority patent/US6018243A/en
Application filed by Western Atlas International Inc filed Critical Western Atlas International Inc
Publication of CA2232654A1 publication Critical patent/CA2232654A1/en
Application granted granted Critical
Publication of CA2232654C publication Critical patent/CA2232654C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • G01V3/32—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electron or nuclear magnetic resonance

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

A nuclear magnetic resonance well logging apparatus including a magnet for inducing a static magnetic field in a substantially cylindrically shaped sector located in earth formations penetrated by a wellbore. The sector subtends an angle of about 60 degrees. The sector is located only on one side of the wellbore and has a longitudinal axis substantially parallel to the wellbore. The apparatus also includes a transmitter for generating a radio frequency magnetic field in the sector for exciting nuclei.
The radio frequency magnetic field and the static magnetic field substantially satisfy nuclear magnetic resonance excitation conditions substantially exclusively within the sector. The apparatus includes a receiver for detecting nuclear magnetic resonance signals from the excited nuclei. In one embodiment of the invention, the static magnetic field has a longer dimension along the longitudinal axis than the active length of the transmitter, and the active length of the transmitter is greater than the active length of the receiver so that only fully polarized nuclei are excited by the radio frequency magnetic field and NMR
signals are detected only from fully radio frequency-excited nuclei.
CA 2232654 1997-05-02 1998-03-18 Nmr well logging apparatus and method Expired - Fee Related CA2232654C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US85062397A 1997-05-02 1997-05-02
US08/850,623 1997-05-02
US08/960,498 US6018243A (en) 1997-10-29 1997-10-29 NMR well logging apparatus and method
US08/960,498 1997-10-29

Publications (2)

Publication Number Publication Date
CA2232654A1 true CA2232654A1 (en) 1998-11-02
CA2232654C CA2232654C (en) 2005-10-18

Family

ID=27126942

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2232654 Expired - Fee Related CA2232654C (en) 1997-05-02 1998-03-18 Nmr well logging apparatus and method

Country Status (6)

Country Link
CA (1) CA2232654C (en)
FR (1) FR2762912B1 (en)
GB (1) GB2324872B (en)
ID (1) ID20242A (en)
IL (1) IL123924A (en)
NO (1) NO981173L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6766854B2 (en) 1997-06-02 2004-07-27 Schlumberger Technology Corporation Well-bore sensor apparatus and method
US6691779B1 (en) 1997-06-02 2004-02-17 Schlumberger Technology Corporation Wellbore antennae system and method
US6114851A (en) * 1999-02-12 2000-09-05 Baker Hughes Incorporated Temperature compensated nuclear magnetic resonance apparatus and method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597681A (en) * 1957-01-30 1971-08-03 Chevron Res Nuclear magnetic well logging
US3667035A (en) * 1970-03-17 1972-05-30 Texaco Development Corp Nuclear magnetism logging
US4350955A (en) * 1980-10-10 1982-09-21 The United States Of America As Represented By The United States Department Of Energy Magnetic resonance apparatus
GB9022145D0 (en) * 1990-10-11 1990-11-21 Oxford Instr Ltd Magnetic field generating assembly
DE69314261T2 (en) * 1992-07-30 1998-04-09 Schlumberger Technology Bv Pulsed NMR device for formation evaluation during drilling
DE69320360T2 (en) * 1992-11-18 1998-12-10 Oxford Instruments Plc, Witney, Oxford Nuclear magnetic resonance device with an RF coil arrangement for generating a homogeneous RF field in a working volume outside the device
GB9412012D0 (en) * 1994-06-15 1994-08-03 Oxford Instr Uk Ltd Magnet assembly
US6121773A (en) * 1997-03-27 2000-09-19 Western Atlas International, Inc. Longitudinal NMR well logging apparatus and method

Also Published As

Publication number Publication date
GB2324872A (en) 1998-11-04
CA2232654C (en) 2005-10-18
FR2762912B1 (en) 2001-04-06
GB9807254D0 (en) 1998-06-03
FR2762912A1 (en) 1998-11-06
NO981173D0 (en) 1998-03-16
IL123924A (en) 2000-12-06
ID20242A (en) 1998-11-05
GB2324872B (en) 2002-01-09
NO981173L (en) 1998-11-03

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed