Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1991-04-10
1992-03-17
Fields, Carolyn E.
Radiant energy
Coded record and readers; invisible radiant energy type
250261, 250265, G61V 510
Patent
active
050971239
ABSTRACT:
Logging method and tool string for identifying and determining the concentrations of subsurface formation elements next to a borehole, by (i) using a broad energy spectra neutron source (such as a chemical source, like AmBe), and (ii) detecting and counting the delayed gamma rays resulting from the activation by the neutrons of atoms of least one element of interest (e.g. aluminum). Two gamma ray detectors may also be disposed on either side of the broad energy spectra neutron source, for detecting and counting the prompt gamma rays resulting from the capture of neutrons by atoms of elements, such as Si, Ca, Fe, S, H, or Cl, Gd, Ti, or K.
The broad energy spectra neutron source is used for both the "activation" and the "capture" measurements. The tool string may also include a natural gamma ray tool for the determination of uranium, thorium and potassium, and for measuring the background to be subtracted from the gross Al activation measurement.
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Grau James A.
Roscoe Bradley A.
Dunn Drew A.
Fields Carolyn E.
Pojunas Leonard W.
Schlumberger Technology Corporation
Wagret Frederic
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