Stephen P Cramer

US Patent:

53311566, Jul 19, 1994

Filed:

Feb 9, 1993

Appl. No.:

8/015708

Inventors:

Daniel R. Hines - Lawrence Ville NJ
Noboru Wada - Evergreen CO
Stephen Garoff - Pittsburgh PA
Oliver C. Mullins - Ridgefield CT
Paul Hammond - Bourn, GB2
Jeffrey Tarvin - Great Shelford, GB2
Stephen P. Cramer - Palo Alto CA
Ralphe Wiggins - Stamford CT

Assignee:

Schlumberger Technology Corporation - New York NY

International Classification:

G01F 500
G01F 174
G01N 2135

US Classification:

250256

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.