GB1163515A - Method and apparatus for measuring neutron characteristics of a material - Google Patents

Method and apparatus for measuring neutron characteristics of a material

Info

Publication number
GB1163515A
GB1163515A GB1519868A GB1519868A GB1163515A GB 1163515 A GB1163515 A GB 1163515A GB 1519868 A GB1519868 A GB 1519868A GB 1519868 A GB1519868 A GB 1519868A GB 1163515 A GB1163515 A GB 1163515A
Authority
GB
United Kingdom
Prior art keywords
neutron
formations
detector
thermal
unit
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.)
Expired
Application number
GB1519868A
Inventor
William B Nelligan
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.)
Services Petroliers Schlumberger SA
Original Assignee
Societe de Prospection Electrique Schlumberger SA
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 Societe de Prospection Electrique Schlumberger SA filed Critical Societe de Prospection Electrique Schlumberger SA
Priority to GB1519868A priority Critical patent/GB1163515A/en
Publication of GB1163515A publication Critical patent/GB1163515A/en
Expired legal-status Critical Current

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)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

1,163,515. Neutron well logging. SOC. DE PROSPECTION ELECTRIQUE SCHLUMBERGER. March 29, 1968, No.15198/68. Heading G1A. [Also in Division G6] To investigate the nature of earth formations in a well bore the formations are irradiated by the pulsed neutron source, 30, and are subsequently scanned by the radiation detector 35 which responds to the thermal neutron concentration in the formation, 34. The instrument 30, is lowered in the bore 31, by the cable 32, the neutron source 33, is pulsed at intervals 24, under the control of signals on the line 52. The resulting indications of thermal neutron concentration characteristic of the earth formation, produced by the detector 35, are transmitted over conductor 56 to the gates 57, 58 and 59. Subtraction of the background counting rate detected by the gate 59, in proportion to the length of the counting intervals 23 and 26, provides a net counting rate for each interval and the ratio, taken by the unit 65, after a selected count is attained in the second interval, is compared in the unit 66 with a desired ratio value thereby providing a measure of the rate of change of neutron concentration in the material. Any difference between these values causes the oscillator control unit 39 to correct the frequency of the variable oscillator 36 so that its period is equal to the thermal neutron decay time of the formations. The detector 35 may be sensitive to either thermal neutrons or gamma rays.
GB1519868A 1968-03-29 1968-03-29 Method and apparatus for measuring neutron characteristics of a material Expired GB1163515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1519868A GB1163515A (en) 1968-03-29 1968-03-29 Method and apparatus for measuring neutron characteristics of a material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1519868A GB1163515A (en) 1968-03-29 1968-03-29 Method and apparatus for measuring neutron characteristics of a material

Publications (1)

Publication Number Publication Date
GB1163515A true GB1163515A (en) 1969-09-10

Family

ID=10054766

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1519868A Expired GB1163515A (en) 1968-03-29 1968-03-29 Method and apparatus for measuring neutron characteristics of a material

Country Status (1)

Country Link
GB (1) GB1163515A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173591A (en) * 1985-04-01 1986-10-15 S I E Inc Pulsed neutron well-logging method
WO2008105784A3 (en) * 2006-05-31 2008-12-18 Battelle Memorial Institute Explosives detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173591A (en) * 1985-04-01 1986-10-15 S I E Inc Pulsed neutron well-logging method
WO2008105784A3 (en) * 2006-05-31 2008-12-18 Battelle Memorial Institute Explosives detector
US9012852B2 (en) 2006-05-31 2015-04-21 Battelle Memorial Institute Explosives detector

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee