Apparatus and tool using tracers and singles point optical probe

Details Apparatus and tool using tracers and singles point optical probe Apparatus and tool using tracers and singles point optical probe

1998-05-07

2000-01-18

Font, Frank G.

Optics: measuring and testing

Oil testing

G01N 3328

Patent

active

060161914

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 single fiber optic probe 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 exits the probe and illuminates the liquid ambient the probe tip or is internally reflected in the probe when gas is present at 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. Signal processing methods for determining holdup are disclosed. According the invention, a method for determining continuous phase velocities includes injecting a fluorescent dye into the fluid at a measured distance upstream of a probe. The time between injection and detection of the dye is used to calculate average continuous phase velocity. A water soluble dye is used to detect the velocity of water, and an oil soluble dye is used to detect the velocity of oil.

REFERENCES:
patent: 4974446 (1990-12-01), Vigneaux
patent: 5130534 (1992-07-01), Gouirand
patent: 5166747 (1992-11-01), Schroeder et al.
"Void Fraction measurement by a computerized double-point resistivity probe",by Behnia and Gillespie, Flow Meas. Instrum., vol. 2, Oct. 1991.
"Multiple optical fiber probe techniques for measuring profiles of gas-liquid interface and its velocity", by Sekoguchi et al., ASME, Nov. 1985, pp. 97-102.
FloView, stat sheet, for Schlumberger, Nov. 1996.

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