WO2002099462A3 - System and methods for formation evaluation while drilling - Google Patents

System and methods for formation evaluation while drilling Download PDF

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Publication number
WO2002099462A3
WO2002099462A3 PCT/US2002/017772 US0217772W WO02099462A3 WO 2002099462 A3 WO2002099462 A3 WO 2002099462A3 US 0217772 W US0217772 W US 0217772W WO 02099462 A3 WO02099462 A3 WO 02099462A3
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
measurements
nmr
relaxation
sensitive region
Prior art date
Application number
PCT/US2002/017772
Other languages
French (fr)
Other versions
WO2002099462A2 (en
Inventor
Manfred G Prammer
Original Assignee
Halliburton Energy Serv 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
Application filed by Halliburton Energy Serv Inc filed Critical Halliburton Energy Serv Inc
Priority to CA2449787A priority Critical patent/CA2449787C/en
Priority to EP02756125A priority patent/EP1405107B1/en
Publication of WO2002099462A2 publication Critical patent/WO2002099462A2/en
Publication of WO2002099462A3 publication Critical patent/WO2002099462A3/en
Priority to NO20035393A priority patent/NO20035393D0/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
    • G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
    • G01R33/5617—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] using RF refocusing, e.g. RARE
    • 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
    • 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
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/50—NMR imaging systems based on the determination of relaxation times, e.g. T1 measurement by IR sequences; T2 measurement by multiple-echo sequences

Abstract

A logging while drilling (LWD) and measuring while drilling (MWD) method and device are disclosed for reducing the sensitivity of NMR measurements to tool motions. The invention is based on NMR relaxation measurements determining longitudinal relaxation times T1 instead of the standard T2 measurements, and involves saturating a relatively wide sensitive region of the formation and processing NMR echo signals which originale approximately from the center of the sensitive region. In another aspect, the invention uses novel pulse sequences and processing algorithms to reduce the time for the relaxation measurement and to provide real-time transfer of data uphole.
PCT/US2002/017772 2001-06-05 2002-06-05 System and methods for formation evaluation while drilling WO2002099462A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2449787A CA2449787C (en) 2001-06-05 2002-06-05 System and methods for formation evaluation while drilling
EP02756125A EP1405107B1 (en) 2001-06-05 2002-06-05 Fast t1 measurement of a geologic formation
NO20035393A NO20035393D0 (en) 2001-06-05 2003-12-04 Formation assessment system and method during drilling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/874,029 US6531868B2 (en) 1996-12-30 2001-06-05 System and methods for formation evaluation while drilling
US09/874,029 2001-06-05

Publications (2)

Publication Number Publication Date
WO2002099462A2 WO2002099462A2 (en) 2002-12-12
WO2002099462A3 true WO2002099462A3 (en) 2003-04-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/017772 WO2002099462A2 (en) 2001-06-05 2002-06-05 System and methods for formation evaluation while drilling

Country Status (5)

Country Link
US (2) US6531868B2 (en)
EP (1) EP1405107B1 (en)
CA (1) CA2449787C (en)
NO (1) NO20035393D0 (en)
WO (1) WO2002099462A2 (en)

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Also Published As

Publication number Publication date
US6717404B2 (en) 2004-04-06
EP1405107B1 (en) 2011-07-20
EP1405107A4 (en) 2005-10-26
US6531868B2 (en) 2003-03-11
US20010040452A1 (en) 2001-11-15
EP1405107A2 (en) 2004-04-07
CA2449787A1 (en) 2002-12-12
CA2449787C (en) 2016-05-17
NO20035393D0 (en) 2003-12-04
US20030141869A1 (en) 2003-07-31
WO2002099462A2 (en) 2002-12-12

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