Name Professor Course Date Abstract Fractured reservoirs have a large amount of oil in place after pressure depletion because the oil was mainly produced through fractures and a large amount of it remains in the matrix porous. Therefore application of Enhanced Oil Recovery (EOR) methods in these reservoirs are more complicated than other conventional types. This study seeks to investigate the possibilities of increasing the recovery factor in a fractured porous matrix by using ionic surfactant and polymer. The ionic surfactant reduces the surface force between the oil and water in a porous matrix. The polymer plays an important role in controlling the water dispersion and increasing the sweep efficiency in fracture channels by increasing the water viscosity. The analyses of recovery improvement were undertaken out using a fractured sandstone core in a core flooding system. The results of the experiment indicate that the oil recovery factor is nearly the enhancement of oil recovery using surfactant-polymer flooding. Sodium lauryl sulfate and polyacrylamide were used as surfactant and polymer respectively. In order to approve the ability of surfactant for wettability alteration and reduction of capillary pressure the contact angle test SEM image and Amott test were conducted. During water surfactant and polymer injection the longitudinal fractured core sample had the lowest injection pressure which means that the porous matrix is not flushed by injected fluid which leads to low oil recovery factor. The results show that while after surfactant flooding the total oil recovery in all core samples were increased almost 20% about 50% of oil was remained in longitudinal fractured core sample due to the impact of dispersion phenomenon in fractures. The results reveal that injection of the polymeric solution increases the oil recovery in longitudinal fractured core sample to 75% by decreasing the dispersion or fingering effect. [...]
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