The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1994
Filed:
Feb. 09, 1993
Daniel R Hines, Lawrence Ville, NJ (US);
Noboru Wada, Evergreen, CO (US);
Stephen Garoff, Pittsburgh, PA (US);
Oliver C Mullins, Ridgefield, CT (US);
Paul Hammond, Bourn, GB;
Jeffrey Tarvin, Great Shelford, GB;
Stephen P Cramer, Palo Alto, CA (US);
Ralphe Wiggins, Stamford, CT (US);
Schlumberger Technology Corporation, New York, NY (US);
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.