Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1990-02-07
1991-06-04
Fields, Carolyn E.
Radiant energy
Coded record and readers; invisible radiant energy type
250264, 250265, G01V 510
Patent
active
050216538
ABSTRACT:
Logging method and tool string for identifying and determining the concentrations of subsurface formation elements next to a borehole, by (i) using a low energy neutron source (either a chemical source, e.g. a .sup.252 Cf, or a deuterium-deuterium electronic source), and (ii) detecting and counting the delayed gamma rays resulting from the activation by the neutrons of atoms of at least one element of interest (e.g. aluminum). Two gamma ray detectors may also be disposed on either side of the low energy 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 low energy 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.
REFERENCES:
patent: 3521064 (1970-07-01), Moran et al.
patent: 3665195 (1972-05-01), Youmans
patent: 3976878 (1976-08-01), Chevalier et al.
patent: 4055763 (1977-10-01), Antkiw
patent: 4283624 (1981-08-01), Mills, Jr.
patent: 4317993 (1982-03-01), Hertzog et al.
patent: 4327290 (1982-04-01), Plasek
patent: 4387302 (1983-06-01), Givens
patent: 4464569 (1984-08-01), Falum
patent: 4506156 (1985-03-01), Mougne
patent: 4810876 (1989-03-01), Wraight et al.
The article "The Aluminum Activation Log"by H. D. Scott and M. P. Smith, presented at the SPWLA Fourteenth Annual Logging Symposium, Lafayette, La., May 6-9-1973.
The article entitled "Geochemical Logging with Spectrometry Tools" by R. Hertzog et al., presented at the 62nd Annual Technical Conference and Exhibition of the SPE, held in Dallas, Tex. on Sep. 27-30, 1987, paper SPE #16792.
The book "Modern Physics for Engineers" from Otto Oldenberg and Norman C. Rasmussen, pp. 419 and 420.
The book "CRC Handbook of Fast Neutron Generators", vol. I, from Julius Csikai, CRC Press, Inc. (Bora Raton) Fla., pp. 3-19, 83, 84.
The book "Chemical Analysis, A Series of Monographs on Analytical Chemistry and Its Applications", Wiley-Interscience Publication, vol. 39, article Activation Analysis with Generators, from Sam S. Nargowalla and Edwin P. Przybylowicz, pp. 18-23.
Grau James
Roscoe Brad
Dunn Drew A.
Fields Carolyn E.
Garrana Henry N.
Schlumberger Technology Corporation
Wagret Frederic C.
LandOfFree
Geochemical logging apparatus and method for determining concent does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Geochemical logging apparatus and method for determining concent, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Geochemical logging apparatus and method for determining concent will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1028334