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• W2118616418 abstract "CO2 has been found to be an efficient agent for recovering heavy oil resources worldwide through an immiscible displacement process. One major disadvantage of CO2 immiscible process is the limited solubility of CO2 in heavy oil, resulting in limited enhanced oil recovery. Addition of light alkane solvents to CO2 stream may provide a better recovery efficiency of heavy oil, though it is not well understood how addition of solvents will affect the phase behaviour and mass transfer of CO2-heavy oil systems. Therefore, it is of fundamental and practical importance to study phase behaviour and mass transfer of the solvent(s)-CO2-heavy oil systems under reservoir conditions. In order to improve the phase behaviour modeling of highly asymmetric systems, e.g., solvent(s)-CO2-heavy oil systems, a new alpha function for the Peng-Robinson equation of state (PR EOS) is first developed. In comparison with the existing alpha functions evaluated in this study, the modified alpha function with the redefined acentric factor at a reduced temperature of 0.6 provides more accurate prediction of vapour pressures of nonhydrocarbon and hydrocarbon compounds, especially heavy hydrocarbons. Subsequently, the enhanced swelling effect and viscosity reduction of CO2-heavy oil systems with the addition of solvent C3H8 or n-C4H10 are experimentally measured and theoretically determined. An increased swelling effect of heavy oil is obtained by adding gas solvent C3H8 or n-C4H10 into the CO2 stream, while an enhanced viscosity reduction of the CO2heavy oil system is also achieved in the presence of either solvent C3H8 or n-C4H10. By treating the heavy oil sample as a single pseudocomponent, three binary interaction parameter (BIP) correlations have been proposed for respectively characterizing CO2heavy oil binaries, C3H8-heavy oil binaries and n-C4H10-heavy oil binaries. The PR EOS" @default.
• W2118616418 created "2016-06-24" @default.
• W2118616418 creator A5064925349 @default.
• W2118616418 date "2013-05-01" @default.
• W2118616418 modified "2023-09-23" @default.
• W2118616418 title "PHASE BEHAVIOUR AND MASS TRANSFER OF SOLVENT(S)-CO2-HEAVY OIL SYSTEMS UNDER RESERVOIR CONDITIONS" @default.
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