Trapping of Micellar Fluids in Berea Sandstone

dc.contributor.advisorPope, Gary A.
dc.creatorDelshad, Mohammad
dc.date.accessioned2020-04-13T21:44:55Z
dc.date.available2020-04-13T21:44:55Z
dc.date.issued1990-08
dc.description.abstractThe objective of this research was to experimentally investigate transport properties such as capillary trapping, relative permeability, dispersivity, and capacitance parameters of micellar fluids under single-and two-phase flow conditions. Low interfacial tension, brine-oil-surfactant-alcohol mixtures with different compositions and salinities were prepared at 30°C. Equilibrated phases (micellar fluids) were separated and used for displacements in Berea sandstone cores. The relation between residual phase saturation and capillary number of these micellar fluids was investigated. For all three types of phase environment, and regardless of which phase was the displacing phase, residual saturations and end-point relative permeabilities for each phase followed the same trend with capillary number. Residual microemulsion also followed the same trend with the capillary number when displaced simultaneously by excess-oil and brine. Steady-state two-phase flow relative permeabilities were measured at constant capillary number. The brine and oil relative permeability curves were concave up (positive second derivative) while that of microemulsion was concave down. The relative permeability curve for microemulsion was above those of brine and oil. Relative permeability data were compared with two relative permeability models. The first model is a simple Corey-type relative permeability model with the saturation exponents treated as adjustable parameters. The second model is a theoretical relative permeability model proposed by Foulser et al. [F5] called the droplet model. The parameter N (number of droplets in each capillary tube) was selected such that the standard error would be minimum. Comparisons were made over a range of capillary numbers and viscosity ratios. Continuous and slug displacement of radioactive tracers, both partitioning and non-partitioning, were also performed at steady-state. Effluent tracer profiles were compared to the numerical solution of a capacitance-dispersion model to estimate saturations, dispersivities, and capacitance parameters. Unlike brine and oil phases, the microemulsion phase did not show a capacitance behavior. Phase by-passing increased as the phase cut was decreased.en_US
dc.description.departmentPetroleum and Geosystems Engineeringen_US
dc.format.mediumelectronicen_US
dc.identifier.urihttps://hdl.handle.net/2152/80584
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/7600
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectMicellar fluiden_US
dc.subjectBerea sandstoneen_US
dc.titleTrapping of Micellar Fluids in Berea Sandstoneen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentPetroleum and Geosystems Engineeringen_US
thesis.degree.disciplinePetroleum Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US

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