Method for determining the concentration of a plurality of...

G - Physics – 01 – N

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G01N 33/28 (2006.01) E21B 49/08 (2006.01)

Patent

CA 2749387

The invention relates to a method that includes extracting a gaseous fraction of each compound, measuring an information representative of the gaseous fraction of each compound, and calculating for each first compound of a first group of compounds the concentration of said first compound in the drilling fluid based on the information measured for the gaseous fraction of the first compound and based on a first correction factor (Pi). The method also includes calculating for each second compound of a second group of compounds the concentration of said second compound in the drilling fluid based on the information measured for the gaseous fraction of the second compound and based on a second correction factor (pi) obtained from a calculation equation relating the second correction factor (pi) to a plurality of independent parameters of the second compound determined from the first correction factors and to a thermodynamic characteristic (Fi) of the second compound.

Ce procédé comprend l'extraction d'une fraction gazeuse de chaque composé, la mesure d'une information représentative de la fraction gazeuse de chaque composé et le calcul, pour chaque premier composé d'un premier groupe de composés, de la teneur dudit premier composé dans le fluide de forage sur la base de l'information mesurée pour la fraction gazeuse du premier composé et sur la base d'un premier facteur de correction (P i). Le procédé comprend le calcul pour chaque deuxième composé d'un deuxième groupe de composés, de la teneur du deuxième composé dans le fluide de forage sur la base de l'information représentative mesurée pour le deuxième composé, et d'un deuxième facteur de correction (p i) calculé à partir d'une équation de calcul reliant le deuxième facteur de correction (p i) à une pluralité de paramètres indépendants du deuxième composé déterminés à partir des premiers facteurs de correction et à un facteur thermodynamique caractéristique (F i) du deuxième composé.

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