Title:
A METHOD AND APPARATUS FOR A DOWNHOLE REFRACTOMETER AND ATTENUATED REFLECTANCE SPECTROMETER
Document Type and Number:
WIPO Patent Application WO2003087788
Kind Code:
A8
Abstract:
The present invention provides a method and apparatus to distinguish between gas and liquid based on the much lower index of refraction of gas. It can also be used to monitor fluid sample clean up over time. The refractive index of a wellbore fluid is determined from the fraction, R, of light reflected off the interface between a transparent window that has a known refractive index and this fluid. Preferably, the refractive index is measured at some wavelength of light for which the fluid is not highly attenuating. However, the adjacent transmission spectrometer can be used to correct the refractive index measurement for attenuation at those wavelengths, which it monitors. Also, this reflection-based refractometer design can be used as an attenuated reflectance spectrometer at highly attenuating wavelengths.
Inventors:
DIFOGGIO ROCCO
WALKOW ARNOLD M
BERGREN PAUL A
WALKOW ARNOLD M
BERGREN PAUL A
Application Number:
PCT/US2003/011095
Publication Date:
July 01, 2004
Filing Date:
April 10, 2003
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
E21B47/10; G01N21/35; G01N21/41; G01N21/55; G01N1/00; (IPC1-7): G01N21/43; E21B49/10; E21B47/10
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