Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1997-06-11
1999-10-26
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502698, G01V 510
Patent
active
059733217
ABSTRACT:
A method for determining the fractional amounts of, and the thermal neutron capture cross-sections of, individual components which are included in the decay spectrum measured by a pulsed neutron well logging instrument. The instrument includes a pulsed high energy neutron source, and one or more gamma ray detectors spaced apart from the source. The method includes generating a data kernel which is made up of representors of decay components of the wellbore and of the earth formations in the vicinity of the instrument. The decay spectrum measured by the instrument is inverted to determine parameters by which the representors are scaled so that in combination the scaled representors most closely match the measured decay spectrum. The parameters represent the fractional amounts of each exponential decay component which makes up the measured exponential decay spectrum.
REFERENCES:
R. C. Hertzog, "Laboratory and Field Evaluation of an Inelastic-Neutron-Scattering and Capture Gamma Ray Spectroscopy Tool." Presented at the 53rd Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME, Houston, Texas, Oct. 1978.
Sales Brochure, PDK 100, Western Atlas Logging Services, Houston, Texas 1994.
Menke, Geophysical Data Analysis: Discrete Inverse Theory, pp. 109-130(1984).
Fagin Richard A.
Hannaher Constantine
Western Atlas International Inc.
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