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- W2054609537 abstract "Abstract In this paper, an experimental technique is developed to study the interfacial interactions of the crude oil-brine-CO2 systems at different pressures and temperatures. The major component of this experimental set-up is a see-through windowed high-pressure cell. By using the axisymmetric drop shape analysis (ADSA) for the pendant drop case, this new technique makes it possible to determine the interfacial tension (IFT) and to visualize the interfacial interactions among the crude oil, brine and CO2 under practical reservoir conditions. More specifically, the equilibrium IFT of the crude oil-CO2 or the brine-CO2 system is measured as a function of pressure and temperature, respectively. For the crude oil-CO2 system, there always exists a constant low IFT (i.e., the partial miscibility) as long as the pressure is higher than a threshold value. No ultra low or zero IFT between the crude oil and CO2 is found at the operating pressures and temperatures tested in this study. For the brine-CO2 system, the complete miscibility between the brine and CO2 can be achieved. In addition, a number of important physical phenomena are observed after the crude oil or brine is made in contact with CO2. In particular, the swelling effect, light-ends extraction, initial turbulent mixing and wettability alteration are the major characteristics of the crude oil-CO2 system, whereas the swelling effect and the complete miscibility are the primary features of the brine-CO2 system. For the crude oil-brine-CO2 systems, wettability between the crude oil and the stainless steel needle in CO2-saturated brine phase is rather different from that of the crude oil-CO2 system. This wettability difference may considerably improve the oil recovery in a previously waterflooded water-wet reservoir during CO2 flooding processes. The immiscibility between the crude oil and CO2-saturated brine phase is still observed up to P=28.196 MPa and T=58°C." @default.
- W2054609537 created "2016-06-24" @default.
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- W2054609537 date "2004-09-26" @default.
- W2054609537 modified "2023-09-26" @default.
- W2054609537 title "Interfacial Interactions of Crude Oil-Brine-CO2 Systems under Reservoir Conditions" @default.
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- W2054609537 doi "https://doi.org/10.2118/90198-ms" @default.
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