Methods and apparatus for downhole fluids analysis

G - Physics – 01 – V

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G01V 8/10 (2006.01) E21B 49/10 (2006.01) G01N 21/35 (2006.01) G01N 33/24 (2006.01) G01N 33/28 (2006.01) G01V 8/12 (2006.01) G01V 8/20 (2006.01)

Patent

CA 2425423

A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second wavelengths an the contribution of oil at the first and second wavelengths, determining a signal response vector and the two wavelengths, calculating a mass fraction vector from the response matrix and the signal response vector and using the mass fraction vector to determine GOR.

La présente invention concerne un procédé permettant de déterminer la proportion gaz-pétrole comprenant l'exposition d'un fluide à une analyse spectroscopique à une première longueur d'onde sensible au gaz et à une seconde longueur d'onde sensible au pétrole, la détermination d'une matrice de réponse correspondant à la contribution du gaz aux première et seconde longueurs d'onde et à la contribution du pétrole aux première et seconde longueurs d'onde, la détermination d'un vecteur signal de réponse et des deux longueurs d'onde, le calcul d'un vecteur de fraction de masse à partir de la matrice de réponse et du vecteur signal de réponse, et l'utilisation du vecteur de fraction de masse pour déterminer la proportion gaz-pétrole (GOR).

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