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• W2019936070 abstract "THE EFFECT OF DISPERSIVE MIXING ON SCALING LABORATORY MICELLAR FLOODS TO RESERVOIR DIMENSIONS Abstract For economic reasons, only a limited slug of a relatively expensive micellar fluid (followed by a polymer-water mobility bank) can be injected to polymer-water mobility bank) can be injected to displace oil with the current micellar flooding process. Once a micellar slug is injected, its process. Once a micellar slug is injected, its composition does not remain the same; instead the composition changes as the slug propagates. Scaling the micellar flooding process can be thought of as using laboratory tests which consider the compositional changes that occur as the slug propagates to determine the minimum size slug necessary for effective displacement of oil throughout the swept portion of the reservoir. portion of the reservoir. Previous work has shown that surfactant retention is an important cause of compositional change which results in loss of displacement efficiency with a micellar slug. Dilution of a micellar slug (due to dispersive mixing) can be an equally important cause of poor displacement efficiency. In scaling a micellar flood, the dispersivity of the reservoir must be estimated from tracer tests. The ability of the micellar fluid to recover oil when it is diluted is a critical design criterion when reservoir dispersivity is large. Laboratory tests in short reservoir cores can be appropriate to simulate performance in a reservoir when the reservoir performance in a reservoir when the reservoir dispersivity is greater than the dispersivity of the reservoir cores. Berea sandstone which has very low dispersivity is not an appropriate porous medium in which to study the scaling of a micellar flood. Introduction Tertiary recovery processes using micellar fluids to mobilize residual oil require that the injected chemicals be propagated at a concentration such that the micellar fluid is either miscible with the oil or increases the capillary number (the ratio of viscous to interfacial forces) to a level suitable for miscible-like oil displacement. Even if oil displacement by a micellar fluid is initially miscible, the displacement usually becomes immiscible due to chemical loss and dispersive mixing which reduce the concentration of the chemicals in the micellar slug. If the capillary number during the immiscible displacement is high enough, the displacement will be miscible-like; the immiscible phases will flow without mutual interference phases will flow without mutual interference resulting in very efficient oil displacement. Designing a micellar flood can thus be simplified to the following:Formulating, in the laboratory, a micellarfluid which is miscible or has a highcapillary number with the reservoir oil.Scaling the laboratory performance to reservoir dimensions. This latter step can be thought of as using laboratory measurements to determine the minimum size slug of micellar fluid which will maintain a chemical composition that remains miscible or miscible-like through the swept portion of the reservoir. Only relatively short (usually less than 0.15m) cores of reservoir rock are available for laboratory tests. Therefore, extremely long core tests in reservoir rock are usually not possible, but one must still be able to scale the effect of system length. The objective of this paper is to demonstrate the combined effect on oil recovery of surfactant retention and dilution of the micellar slug (due to dispersive mixing) as a function of system length. Background Compositional simulators have been developed and applied to predict performance of micellar floods in laboratory cores; however, simulators based on simplified concepts are often used in predicting micellar flood performance in a reservoir. predicting micellar flood performance in a reservoir. A stratified reservoir simulator based on streamtube concepts was used by Yanosik et al. to predict performance of the Sloss tertiary micellar pilot. performance of the Sloss tertiary micellar pilot." @default.
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• W2019936070 date "1980-04-20" @default.
• W2019936070 modified "2023-09-25" @default.
• W2019936070 title "The Effect Of Dispersive Mixing On Scaling Laboratory Micellar Floods" @default.
• W2019936070 doi "https://doi.org/10.2118/8828-ms" @default.
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