The precise measurement of transport properties such as mass diffusion, thermodiffusion coefficients and viscosity in reservoir conditions is essential to complex models predicting and optimizing the exploitation of oil fields. However, available experimental data are very rare at high pressure.
In this work, measurements have been performed on the iso-massic dodecane/hexane (nC12-nC6) and decane/pentane (nC10-nC5) binary mixtures at 25ºC and at high pressure conditions: from 0.1MPa until 20MPa. Thermodiffusion coefficient has been measured by means of thermogravitational technique at Mondragon Goi Eskola Politeknikoa; while diffusion coefficient has been measured by means of Dynamic Near Field Scattering technique at the Université de Pau et des Pays de l'Adour. By a combination of these two measurements, the Soret coefficient of the investigated binary mixture has been established.