API estimate using multiple fluorescence measurements
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United States of America Patent
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Jul 14, 1998
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N/A
app pub date -
Jun 17, 1996
filing date -
Mar 5, 1996
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Expired
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Abstract
A method for evaluating the API gravity of a sample of underground formation includes steps of: Solvating a known volume of an underground formation sample in a known volume of a solvent which will solvate hydrocarbons; Quantitatively measuring with a changeable filter portable fluorometer the emission fluorescence of the solvated sample at a fixed excitation wavelength with measurements of emission intensities at two points; characterizing the oil by the ratio of two emission intensities obtained at a fixed excitation wavelength; determining the yield; applying regression analysis to a data base of oils to obtain an equation which results in an algorithm value; and interpreting the value of the algorithm to give a value for API gravity and estimate in-situ oil concentration.
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