Patent ID: 6476384
Filing Date: 2002-11-05
Classification: E21B,G01N

Abstract:
A method of determining gas-oil ratio of a formation fluid comprising:a) subjecting the fluid to spectroscopic analysis at at least two wavelengths, one of which is sensitive to the presence of gas and the other of which is sensitive to the presence of oil and generating response data; b) determining a response matrix {circumflex over (B)} from the response of gas at the two wavelengths and the response of oil at the two wavelengths; c) determining a signal response vector {right arrow over (S)} at the two wavelengths; d) calculating a mass fraction vector {right arrow over (m)} of a gas-oil mixture according to the relationship {right arrow over (S)}={circumflex over (B)}{right arrow over (m)}; and e) determining the gas-oil ratio from the mass fraction vector.