G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 33/28 (2006.01) G01F 1/74 (2006.01)
Patent
CA 2576714
The invention relates to a method of measuring the ratio of gas volume flow rate to the volume flow rate of a multiphase hydrocarbon mixture. The inventive method comprises the following steps consisting in: sampling (A) the gas and liquid in the pipeline and measuring the ratio (ag) of the section occupied by the gas in the flow of the mixture; analysing (B) the composition of the gas and liquid samples in order to determine the mass or mole fraction of the carbon compounds, composition parameters [Xi] [Yi]; using [Xi] [Yi] to determine the intensive properties of each phase (?liquid, ?gas) with the aid of a thermodynamic equilibrium simulation; calculating (D) the measured density (?mm) of the mixture; using an adaptive process to calculate (E) the calculated density (?c) of the mixture by comparing ?c and ?mm, the mixture being analytically reconstructed when said density values are equal; and calculating (F) the ratio (GVF) of the gas volume flow rate to the volume flow rate of the mixture. The invention can be used for the management and exploitation of hydrocarbon pipelines downstream of the wellhead.
L'invention concerne un procédé de mesure du rapport du débit volumique de gaz au débit volumique d'un mélange d'hydrocarbures multiphasique. On échantillonne (A) le gaz et le liquide dans la conduite et on mesure dans l'écoulement du mélange le rapport (.alpha.g ) de la section d'occupation du gaz, on analyse (B) la composition des échantillons de gaz et de liquide pour déterminer la fraction massique ou molaire des composés carbonés, paramètres de composition [Xi] [Yi], on détermine ô partir de [Xi] [Yi] par simulation d'un équilibre thermodynamique les propriétés intensives de chaque phase, (.rho.liquide, .rho.gaz), on calcule (D) la densité mesurée ( ) du mélange, on calcule (E) par processus adaptatif la densité calculée (.rho.c ) du mélange, par comparaison de .rho.c et .rho.mm, et sur égalité de ces densités, le mélange étant analytiquement reconstitué, on calcule (F) le rapport (GVF) du débit volumique de gaz au débit volumique du mélange. Application ô la gestion et l'exploitation des conduites d'hydrocarbures en aval de la tête de puits.
David Pierre-Yves
Di Maggio David
Geoservices
Geoservices Equipements
Robic
LandOfFree
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