Patent ID: 7631543
Filing Date: 2009-12-15
Classification: G01N

Abstract:
1. A method for determining the composition and water salinity of a multi-component mixture of a gas and at least one liquid, including water, in a pipe conducting a wet gas well stream, the method comprising the following steps: a. electromagnetic phase measurements are performed between two receiving antennas located at different distances from a sending antenna, b. based on an empirically determined constant(s) and the above measurements, the effective and imaginary dielectric constants are determined, c. the mixture density is determined, d. the temperature and pressure are determined, e. based on the knowledge of densities, effective dielectric constants and imaginary dielectric constants of the components of the fluid mixture and the results of the above steps a-d, the volume fractions of the gas and liquid or liquids of the fluid mixture and salinity of the water are calculated; wherein the electromagnetic phase measurements are performed by doing a frequency sweep on a transmitting antenna and measuring the frequency at at least three pre-determined phase differences on the two receiving antennas.