Optics: measuring and testing – For light transmission or absorption
Patent
1998-05-07
2000-02-08
Font, Frank G.
Optics: measuring and testing
For light transmission or absorption
356436, G01N 2100
Patent
active
060233400
ABSTRACT:
Single point optical probes for measuring three-phase characteristics of fluid flow in a hydrocarbon well and methods of processing signals generated by the probe are disclosed. A probe having a single fiber optic is coupled to a light source and apparatus for detecting reflectance and fluorescence. Light is delivered to the tip of the probe where it either is internally reflected in the probe or exits the probe and illuminates the fluid (liquid) ambient the probe tip. If the fluid at the probe tip is oil, the light exits the probe, illuminates the oil, and causes the oil to fluoresce. If the fluid is water, no fluorescence occurs. If the fluid is gas, at least some light is internally reflected in the probe. A detection system including at least one beam splitter and fluorescence and reflectance detectors is provided in conjunction with the probe. Preferably, the fluorescence detector is coupled to the fiber optic by a wavelength division multiplexer. A preferred signal processing system for detecting oil, gas, and water provides two quasi-binary indicators: gas/liquid and oil
ot oil. Three of the four possible indications (gas-not oil, liquid-not oil, and liquid-oil) give reliable results indicating whether the fluid at the probe tip is gas, water, or oil. One of the four possible indications (gas-oil) can be considered an error indicator.
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Fordham Edmund J.
Mullins Oliver C.
Ramos Rogerio Tadeu
Wu Xu
Batzer William B.
Font Frank G.
Gordon David P.
Schlumberger Technology Corporation
Stafira Michael P.
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