CA2230902A1 - Radial nmr well logging apparatus and method - Google Patents

Radial nmr well logging apparatus and method

Info

Publication number
CA2230902A1
CA2230902A1 CA002230902A CA2230902A CA2230902A1 CA 2230902 A1 CA2230902 A1 CA 2230902A1 CA 002230902 A CA002230902 A CA 002230902A CA 2230902 A CA2230902 A CA 2230902A CA 2230902 A1 CA2230902 A1 CA 2230902A1
Authority
CA
Canada
Prior art keywords
magnetic field
longitudinal axis
materials
magnet
cylinders
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
CA002230902A
Other languages
French (fr)
Other versions
CA2230902C (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 US08/959,770 external-priority patent/US5959453A/en
Application filed by Western Atlas International Inc filed Critical Western Atlas International Inc
Publication of CA2230902A1 publication Critical patent/CA2230902A1/en
Application granted granted Critical
Publication of CA2230902C publication Critical patent/CA2230902C/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

ABSTRACT OF THE DISCLOSURE

A nuclear magnetic resonance sensing apparatus, including a magnet for inducing a static magnetic field within materials to be analyzed. The magnetic field is 5 substantially coaxial with a longitudinal axis of the apparatus. The magnetic field is polarized substantially perpendicularly to the longitudinal axis and is symmetric about the axis. The static magnetic field has a maximum longitudinal gradient which isinversely related to a speed of motion of the apparatus along the longitudinal axis through the materials to be analyzed. The apparatus includes a transmitter for generating 10 a radio frequency magnetic field in the materials for exciting nuclei in the materials. The radio frequency magnetic field is substantially orthogonal to the static magnetic field.
The apparatus includes a receiver for detecting nuclear magnetic resonance signals from the excited nuclei in the materials. In a preferred embodiment, the magnet comprise magnetized cylinders stacked along the longitudinal axis. The magnetization of each of 15 cylinder is proportional to its distance from a center plane of the magnet. The cylinders are magnetized parallel to the longitudinal axis and towards the center plane. The preferred embodiment of the magnet includes an end magnet disposed at each longitudinal end of the stacked cylinders. The end magnets are each magnetized parallel to the longitudinal axis and in a direction opposite to the magnetization of an adjacent 20 one of the cylinders.
CA002230902A 1997-03-28 1998-02-26 Radial nmr well logging apparatus and method Expired - Fee Related CA2230902C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US82840197A 1997-03-28 1997-03-28
US08/828,401 1997-03-28
US08/959,770 1997-10-29
US08/959,770 US5959453A (en) 1997-10-29 1997-10-29 Radial NMR well logging apparatus and method

Publications (2)

Publication Number Publication Date
CA2230902A1 true CA2230902A1 (en) 1998-09-28
CA2230902C CA2230902C (en) 2002-04-23

Family

ID=27125183

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002230902A Expired - Fee Related CA2230902C (en) 1997-03-28 1998-02-26 Radial nmr well logging apparatus and method

Country Status (6)

Country Link
CA (1) CA2230902C (en)
FR (1) FR2761478B1 (en)
GB (1) GB2324376B (en)
ID (1) ID20124A (en)
IL (1) IL123760A (en)
NO (1) NO980897L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6727696B2 (en) * 1998-03-06 2004-04-27 Baker Hughes Incorporated Downhole NMR processing
FR2970286B1 (en) * 2011-01-07 2014-01-03 Jean-Pierre Martin PROBE FOR ANALYZING AN ASSEMBLY OF RODS OR TUBES

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268800A (en) * 1964-05-08 1966-08-23 Mobil Oil Corp Nuclear magnetic resonance well logging
GB1110804A (en) * 1964-08-05 1968-04-24 Chevron Res Nuclear magnetism well logging method and apparatus
US3402343A (en) * 1965-08-02 1968-09-17 Chevron Res High speed, high resolution, nuclear magnetism well logging apparatus having a plurality of receiving coils and an extended polarizing coil, and method for using same
US3402344A (en) * 1965-08-02 1968-09-17 Chevron Res Nuclear magnetism well logging method and apparatus
US3667035A (en) * 1970-03-17 1972-05-30 Texaco Development Corp Nuclear magnetism logging
US3723856A (en) * 1971-04-09 1973-03-27 Chevron Res Crossed-coil nuclear magnetism well logging apparatus and method utilizing a polarizing field and an additional polarizing field to shift the direction of polarization
US4717877A (en) * 1986-09-25 1988-01-05 Numar Corporation Nuclear magnetic resonance sensing apparatus and techniques
US5757186A (en) * 1996-02-23 1998-05-26 Western Atlas International, Inc. Nuclear magnetic resonance well logging apparatus and method adapted for measurement-while-drilling

Also Published As

Publication number Publication date
FR2761478B1 (en) 2002-10-18
GB2324376B (en) 2001-10-03
CA2230902C (en) 2002-04-23
NO980897L (en) 1998-09-29
FR2761478A1 (en) 1998-10-02
GB9806173D0 (en) 1998-05-20
IL123760A0 (en) 1998-10-30
IL123760A (en) 2001-04-30
ID20124A (en) 1998-10-08
NO980897D0 (en) 1998-03-02
GB2324376A (en) 1998-10-21

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