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Abstract

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 (.alpha..sub.g) 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 [X.sub.i] [Y.sub.i]; using [X.sub.i] [Y.sub.i] to determine the intensive properties of each phase (?.sub.liquid, ?.sub.gas) with the aid of a thermodynamic equilibrium simulation; calculating (D) the measured density (?.sub.mm) of the mixture; using an adaptive process to calculate (E) the calculated density (?.sub.e) of the mixture by comparing ?.sub.c and ?.sub.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.

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First Claim