IE791847L - Measuring thermal neutron characterisrics - Google Patents

Measuring thermal neutron characterisrics

Info

Publication number
IE791847L
IE791847L IE791847A IE184779A IE791847L IE 791847 L IE791847 L IE 791847L IE 791847 A IE791847 A IE 791847A IE 184779 A IE184779 A IE 184779A IE 791847 L IE791847 L IE 791847L
Authority
IE
Ireland
Prior art keywords
neutron
time gates
thermal neutron
burst
sequence
Prior art date
Application number
IE791847A
Other versions
IE49620B1 (en
Original Assignee
Schlumberger 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
Priority claimed from US05/955,176 external-priority patent/US4224516A/en
Priority claimed from US05/955,175 external-priority patent/US4223218A/en
Application filed by Schlumberger Ltd filed Critical Schlumberger Ltd
Publication of IE791847L publication Critical patent/IE791847L/en
Publication of IE49620B1 publication Critical patent/IE49620B1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
    • G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/107—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons
    • G01V5/108—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons the neutron source being of the pulsed type

Landscapes

  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Measurement Of Radiation (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

The thermal neutron decay characteristics of an earth formation are measured by detecting indications of the thermal neutron concentration in the formation during a selected set of two measurement intervals following irradiation of the formation with a burst of fast neutrons. These measurement intervals may consist of a sequence of contiguous, discrete time gates which begins following a discrete time delay after the preceding neutron burst and extends over substantially the remainder of the interval between neutron bursts. The time gates are divided into a number of groups. The durations of the individual discrete time gates within the groups are equal, but the duration of the time gates progressively increases from group to group in the sequence. The duration of the neutron bursts, time delay between the burst and the start of the sequence and of the individual time gates may all be adjusted by a common, selected one of a finite number of scale factor values. The particular set of measurement intervals used is selected from among a number of possible sets as a function of a previously measured value of the decay characteristic. Each measurement interval set is used over only a specific range of decay characteristic values for which it has been determined, in accordance with a previously established relationship between the decay characteristic value and a function of the thermal neutron concentration measurements for the set, to afford enhanced statistical accuracy in the measured value of the decay characteristic. <IMAGE> [GB2036303A]
IE1847/79A 1978-10-26 1979-09-28 Method and apparatus for measuring thermal neutron characteristics IE49620B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/955,176 US4224516A (en) 1978-10-26 1978-10-26 Methods and apparatus for measuring thermal neutron decay characteristics of earth formations
US05/955,175 US4223218A (en) 1978-10-26 1978-10-26 Methods and apparatus for optimizing measurements of thermal neutron decay characteristics

Publications (2)

Publication Number Publication Date
IE791847L true IE791847L (en) 1980-04-26
IE49620B1 IE49620B1 (en) 1985-11-13

Family

ID=27130364

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1847/79A IE49620B1 (en) 1978-10-26 1979-09-28 Method and apparatus for measuring thermal neutron characteristics

Country Status (11)

Country Link
AU (1) AU532895B2 (en)
DE (1) DE2941535A1 (en)
EG (1) EG14646A (en)
ES (1) ES8103385A1 (en)
FR (1) FR2440004A1 (en)
GB (4) GB2036303B (en)
IE (1) IE49620B1 (en)
IT (1) IT1125588B (en)
MY (1) MY8500178A (en)
NL (1) NL7907391A (en)
NO (1) NO793185L (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1165017A (en) * 1980-08-28 1984-04-03 Harold E. Peelman System for simultaneous measurement of borehole and formation neutron lifetimes
CA1162660A (en) * 1980-08-28 1984-02-21 Harry D. Smith Method for simultaneous measurement of borehole and formation neutron lifetimes
CA1162659A (en) * 1980-08-28 1984-02-21 Ward E. Schultz Method for simultaneous measurement of borehole and formation neutron lifetimes employing iterative fitting
US4445033A (en) * 1981-09-14 1984-04-24 Schlumberger Technology Corporation Methods and apparatus for environmental correction of thermal neutron logs
GB8331914D0 (en) * 1983-11-30 1984-01-04 Atomic Energy Authority Uk Inspection of buried pipelines
US4712007A (en) * 1985-04-01 1987-12-08 S.I.E., Inc. Pulsed neutron logging method using cumulative count curves
CN115788421B (en) * 2023-02-14 2023-05-09 山东交通学院 Integrated natural gamma energy spectrum logging instrument

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL70135C (en) * 1946-12-04 1952-01-15 Philips Nv
US3566116A (en) * 1966-11-08 1971-02-23 Schlumberger Technology Corp Method and apparatus for measuring neutron characteristics of a material surrounding a well bore
US3379882A (en) * 1967-03-16 1968-04-23 Dresser Ind Method and apparatus for neutron well logging based on the lifetime of neutrons in the formations
US3890501A (en) * 1973-05-01 1975-06-17 Schlumberger Technology Corp Neutron logging reliability techniques and apparatus

Also Published As

Publication number Publication date
FR2440004B1 (en) 1984-12-21
DE2941535A1 (en) 1980-05-08
FR2440004A1 (en) 1980-05-23
ES485366A0 (en) 1981-02-16
AU532895B2 (en) 1983-10-20
GB2113386A (en) 1983-08-03
IT1125588B (en) 1986-05-14
IT7926758A0 (en) 1979-10-24
AU5155579A (en) 1980-05-01
MY8500178A (en) 1985-12-31
GB2113387A (en) 1983-08-03
GB2113385B (en) 1983-12-21
GB2036303A (en) 1980-06-25
EG14646A (en) 1985-03-31
GB2036303B (en) 1983-08-17
NL7907391A (en) 1980-04-29
GB2113387B (en) 1983-12-21
NO793185L (en) 1980-04-29
ES8103385A1 (en) 1981-02-16
IE49620B1 (en) 1985-11-13
GB2113386B (en) 1983-12-21
GB2113385A (en) 1983-08-03

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