Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1995-08-30
1996-06-25
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502691, 250266, 250264, 250256, G01V 512
Patent
active
055302432
ABSTRACT:
A method for determining density of a formation. The method includes irradiating the formation with gamma rays having energy consistent with Compton scattering. Gamma rays are measured at axially spaced apart locations. Two of the axially spaced apart locations are at an equal distance and in opposite directions relative to the source of gamma rays. The distance is smaller than the spacing of another one of the spaced apart locations. An apparent density for each spaced apart location is determined from the counts. Differences are calculated in apparent density between each one of the spaced apart locations, and a correction factor is determined for apparent density at each spaced apart location, thereby determining the density of the earth formation. In a preferred embodiment, determining correction factors is performed by a neural network using the differences in apparent density as an input vector.
REFERENCES:
patent: 3321625 (1967-05-01), Wahl
patent: 4048495 (1977-09-01), Ellis
patent: 4661700 (1987-04-01), Holenka
patent: 5390115 (1995-02-01), Case et al.
Fagin Richard A.
Hannaher Constantine
Tyler Virgil Orlando
Western Atlas International Inc.
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