Objective
THE AIM OF THIS PROJECT IS TO OPTIMIZE THE CHOICE AND THE CONCENTRATION OF THE SURFACTANTS USED IN ENHANCED SECONDARY OIL RECOVERY.
Several model oil water surfactant multiphase microemulsion systems have been studied. Dispersion sizes in the microemulsion phases have been measured with X-ray scattering. Also, interfacial tensions between the different phases have been measured with surface light scattering and surfactant film bending elasticity was measured with ellipsometry. A comparison between the data and the existing theories was made. Microemulsion phase structural studies have emphasized the importance of the properties of the surfactant film through the parameters of spontaneous curvature and of the film curvature elastic modulus. The measurement of film bending elasticity allowed calculation of the persistence length of the film which was in qualitative agreement with the one required to explain the bulk structure observed at optimal salinity. The detailed calculations of the interfacial tensions from available theories did not agree with the experimental measurements. However an approximate and simple relation has been found to calculate the optimal interfacial tensions.
Molecular diffusion has been studied in a model porous media with a fluorescence recovery technique. Scale dependent diffusion has been recorded in 2 asymptotic regimes free diffusion for scales much smaller than the mean pore size and averaged diffusion at large scales. A simple model has been used to interpret the data, which led to a detailed description of the structure of the porous media.
DUE TO ABSORPTION ON THE RESERVOIR ROCKS, THE SURFACTANT CONCENTRATION USED IN ACTUAL SECONDARY OIL RECOVERY MUST GREATLY EXCEED THE OPTIMAL ONE. THIS GIVE RISE TO MICROEMULSIONS FORMATION. MAXIMUM OIL RECOVERY IS ATTAINED WHEN OPTIMAL SURFACE TENSION IS REACHED, CORRESPONDING TO A MICROEMULSION IN EQUILIBRIUM WITH BOTH EXCESS OIL AND WATER, AND HAVING THE SMAE INTERFACIAL TENSION WITH BOTH EXCESS PHASES.
IN THE FIRST PHASE OF THE PROJECT THE RELATIONS BETWEEN SURFACTANT STUCTURE AND THE AFORMENTIONED INTERFACIAL TENSIONS WILL BE STUDIED ON A NUMBER OF MODEL SYSTEMS LIKE: TOLUENE-H2O-NACL-NA DODECYLSULPHATE-BUOH; DODECANE-H2O-NACL-HEXADECYLBENZENESULPHONATE-BUOH; OCTANE-H2O-NACL-TETRADECYLTRIMETHYL N CL-BUOH.
INTERFACIAL TENSION MEASUREMENTS WILL BE CARRIED OUT BY FREQUENCY ANALYSIS OF THE LIGHT SCATTERED BY THE INTERFACE.
MICROEMULSIONS PHASES CHARACTERIZATION WILL BE STUDIED BY BULK LIGHT SCATTERING TECHNIQUES, BOTH ELASTIC AND INELASTIC IF THE SYSTEM CAN BE DILUTED. THIS IS THE CASE WHEN THE MICROEMULSION HAS DROPLET STRUCTURE. SHOULD THE MICROEMULSION BE IN EQUILIBRIUM WITH BOTH EXCESS OIL OR WATER, X-RAY MEASUREMENTS WILL BE PERFORMED GIVING DIRECT INDICATIONS OF THE DISPERSION SCALE. THESE MEASUREMENTS WILL BE CARRIED OUT AT THE COLLEGE DE FRANCE. THE INTERFACIAL STRUCTURES (LAYERS OF SURFACTANT) BETWEEN THE MICROEMULSION AND THE EXCESS PHASE WILL BE LOOKED INTO BY THE ELLIPSOMETRIC TECNIQUE. IN THE SECOND PHASE, THE BEHAVIOUR OF MULTIPHASE SYSTEMS IN POROUS MEDIA WILL INVESTIGATED. THE "FLUORESCENCE RECOVERY AFTER FRINGE PATTERN PHOTOBLEACHING" TECHNIQUE WILL BE USED WITH A SYNTHETIC POROUS SYSTEM MADE UP OF SILICON PARTICLES.THE BEHAVIOUR OF MICROEMULSIONS THAT WILL SIMULATE AT A SMALL SCALE A TWO-PHASE FLOW OF OIL AND WATER WILL BE INVESTIGATED BY THE USE OF FLUORESCENT PROBES, SOLUBLE EITHER IN WATER, IN OIL OR IN THE INTERFACIAL REGIONS.
THE INFLUENCE OF THE DISPERSION SCALE AND OF THE STRUCTURE OF THE MICROEMULSIONS ON THE TRANSPORT PHENOMENA IN POROUS MEDIA WILL BE EXAMINED.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Coordinator
75230 PARIS
France
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