Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1993-02-09
1994-07-19
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250301, 2503391, 250343, G01F 500, G01F 174, G01N 2135
Patent
active
053311566
ABSTRACT:
Methods for quantifying the oil and water fractions of a fluid stream. A first method broadly includes making optical density (OD) measurements of the fluid stream by detecting photons of a first predetermined energy where the oil and water absorption characteristics are substantially identical (e.g., 1710 nm wavelength), and determining the oil and water fractions f.sub.o and f.sub.w according to OD.perspectiveto.f.sub.w .alpha..sub.w l+f.sub.o .alpha..sub.o l where .alpha..sub.w and .alpha..sub.o are related to the absorption coefficients of the oil and water at the predetermined energy, l is the path width of the fluid stream, and f.sub.w +f.sub.o =1. A second method which eliminates scattering effects utilizes the photons at the first predetermined energy and further utilizes photons of a second predetermined energy which is sufficiently close to the first predetermined energy such that the oil fraction is a linear function of the OD over the energy range. The oil and water fractions are then determined from the difference in optical density values (.DELTA.OD) according to .DELTA.OD=f.sub.o [(OD.sub.o,a -OD.sub.o,b)- (OD.sub.w,a -OD.sub.w,b)]+(OD.sub.w,a -OD.sub.w,b), where OD.sub.o,a, OD.sub.o,b, OD.sub.w,a, and OD.sub.w,b are the optical densities per unit length of pure oil (o) and pure water (w) at the first (a) and second (b) wavelengths.
REFERENCES:
patent: 4707603 (1987-11-01), Miemala et al.
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patent: 5105085 (1992-04-01), McGuire et al.
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Cramer Stephen P.
Garoff Stephen
Hammond Paul
Hines Daniel R.
Mullins Oliver C.
Gordon David P.
Hannaher Constantine
Pojunas Leonard W.
Schlumberger Technology Corporation
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