Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1997-02-11
1998-09-15
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502697, G01V 510
Patent
active
058082980
ABSTRACT:
A method for determining oil saturation in an earth formation penetrated by a wellbore. Measurements of relative amounts of carbon and oxygen are made by spectral analysis of neutron-induced inelastic gamma rays detected from the earth formation at spaced apart locations. The method includes calculating an apparent oil holdup in the wellbore at each of the spaced apart locations from the relative amounts of carbon and oxygen. A corrected oil holdup is calculated in the wellbore from differences between the apparent holdups determined at each of the spaced apart locations. An apparent oil saturation in the formation is determined at each of the spaced apart locations from the relative amounts of carbon and oxygen and the corrected oil holdup. A corrected formation oil saturation is determined from differences between the apparent oil saturations at each of the spaced apart locations. In a preferred embodiment, the apparent oil holdups and apparent oil saturations are determined by comparing the measured carbon and oxygen amounts with empirical relationships of the relative amounts of carbon and oxygen with respect to known values of oil holdup and oil saturation for various mineral compositions and porosity values of the earth formation.
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Fagin Richard A.
Hannaher Constantine
Western Atlas International Inc.
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