CA2246180A1 - Method and apparatus for measuring nuclear magnetic resonance - Google Patents

Method and apparatus for measuring nuclear magnetic resonance

Info

Publication number
CA2246180A1
CA2246180A1 CA002246180A CA2246180A CA2246180A1 CA 2246180 A1 CA2246180 A1 CA 2246180A1 CA 002246180 A CA002246180 A CA 002246180A CA 2246180 A CA2246180 A CA 2246180A CA 2246180 A1 CA2246180 A1 CA 2246180A1
Authority
CA
Canada
Prior art keywords
formation
gradient
volume
echoes
magnetic field
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
CA002246180A
Other languages
French (fr)
Other versions
CA2246180C (en
Inventor
Pabitra N. Sen
Boqin Sun
Reza Taherian
Abdurrahman Sezginer
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
Publication of CA2246180A1 publication Critical patent/CA2246180A1/en
Application granted granted Critical
Publication of CA2246180C publication Critical patent/CA2246180C/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
    • G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity

Abstract

The present invention relates generally to an apparatus and method for measuringnuclear magnetic resonance properties of an earth formation traversed by a borehole by generating gradient-echoes. The measurement can be made while drilling or using a wireline tool. The apparatus applies a static magnetic field, B a, in a volume of the formation which polarizes the nuclei of hydrogenous connate fluids within the formation. The apparatus applies a second magnetic field, B b, in a volume of the formation. The magnetic fields B a and B b are substantially orthogonal in the volume of the formation. A change in the polarity of the magnetic field, B b, reverses the direction of precession of the nuclei thereby generating a train of gradient-echoes. Each gradient-echo signal is transformed into the frequency domain and the signal frequency is mapped to a radial position in the volume of the formation in order to generate an image of the formation. Various properties of the formation, such as the effective diffusion coefficient of the formation fluid, longitudinal relaxation time, spin-spin relaxation time, and porosity can be estimated from the train of gradient-echoes.
CA002246180A 1997-09-25 1998-08-28 Method and apparatus for measuring nuclear magnetic resonance Expired - Fee Related CA2246180C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/936,892 1997-09-25
US08/936,892 US6166543A (en) 1997-09-25 1997-09-25 Method and apparatus for measuring nuclear magnetic resonance

Publications (2)

Publication Number Publication Date
CA2246180A1 true CA2246180A1 (en) 1999-03-25
CA2246180C CA2246180C (en) 2001-07-24

Family

ID=25469204

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002246180A Expired - Fee Related CA2246180C (en) 1997-09-25 1998-08-28 Method and apparatus for measuring nuclear magnetic resonance

Country Status (5)

Country Link
US (4) US6166543A (en)
AR (1) AR017139A1 (en)
CA (1) CA2246180C (en)
GB (1) GB2330203B (en)
NO (1) NO984456L (en)

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Also Published As

Publication number Publication date
GB2330203A (en) 1999-04-14
NO984456L (en) 1999-03-26
US6107797A (en) 2000-08-22
US6366086B1 (en) 2002-04-02
CA2246180C (en) 2001-07-24
GB2330203B (en) 1999-12-15
US6133735A (en) 2000-10-17
AR017139A1 (en) 2001-08-22
GB9818685D0 (en) 1998-10-21
NO984456D0 (en) 1998-09-24
US6166543A (en) 2000-12-26

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