It had a viscosity ofġ800 mPa s and a density of 950 kg/m 3 at The heavyĬrude oil selected was from the Lone Rock field The procedure followed in this study is similar to that of Sayegh et al. Much as these fractions are "real", the characterization of the heavy oil is based on experimental evidence. Heavy oil as pseudo-components for equationof-state (EOS) correlation purposes. Of this exercise is to use the fractions of the Is to separate the oil into fractions and measure the phase behavior of CO2 with the heavyĬrude oil, as well as its fractions. Property correlations using an equation-ofstate. System and to correlate the data to develop The main objective of this project is to provide a reliable set of extensive experimentalĭata for the phase behavior and physical properties of a typical Canadian heavy oil-CO2 (V-L), liquid-liquid (L-L), liquid-liquidvapor ( L - L - V ), solid-vapor-liquid (S-L-V)Īnd solid-liquid-liquid-vapor ( S - L - L - V ) Generally in the vapor-liquid equilibrium (VL - E ) region (specially at the higher temperatures), whereas the phase behavior in heavy Phase behavior in light oil-CO2 systems is Oil reservoirs are significantly different from The conditions at which enhanced oil recovery (EOR) operations are carried out in heavy There is a scarcity of good experimental dataįor heavy oil systems and, consequently, reliable property correlations have not yet been Well as correlations and predictive schemes. Physical properties of heavy oils with CO2, as Stimulant during fracturing and acidizing andĪs an additive to the steam injection process.Ī requirement for the proper design of CO2įlooding processes is the availability of reliableĮxperimental data of the phase behavior and Miscible flooding agent, is also used as a well Turn, influence the oil displacement process.ĬO2, besides being used as a miscible and im*Current Address: Saudi Aramco, Box 62, Dhahran 31311, Oil swelling and viscosity reduction, which in Immiscible C O 2 flooding is increasinglyīeing considered for enhanced oil recovery,Įspecially from medium and heavy oil reservoirs (Miller and Jones, 1981 Meyn and Murtada, 1984 Sayegh and Maini, 1984 Sankur etĪl., 1985 Saner and Patton, 1986 Chung et al.,ĬO2 contacts and mobilizes the crude oils are Mixture densities were cor related using the volume translated PR EOS and viscosities were correlated by equations proposed by Lederer. The phase behavior data were also interpreted using binary and ternary mixtures of CO2 with nalkanes having the same molecular weights as the oil fractions. The phase behavior data of the heavy oil and its fractions with CO2 were correlated by the Peng-Robinson (PR) equation of state (EOS). Samples show the extraction of light ends into the CO2 phase, but no deposition of heavy ends could be detected. Simulated distillation analysis of the oil The extent of this reduction was largerĪt 21 ☌ than at 140 ☌ and was more pronounced for the more viscous oils. An important effect of CO2 was the large reduction in the oil viscosities. A significant amount of oil swelling was also Pressure were small when compared to the changes due to temperature. Increased with pressure at 21 ☌ however, they decreased with pressure at 140☌. The solubility of CO~ increased with pressure and decreased with increasing temperature. Obtained during the measurements were analyzed using gas chromatographic simulated distillation. MPa, and included the mixtures' solubilities, swelling factors, densities, gas/oil ratios and viscosities. The phase behavior data were then measured at 21 ☌ and 140☌, and at several pressures up to 12.41 The heavy oil was divided into three fractions by asphaltene precipitationĪnd distillation. Heavy oil and with its constitutive fractions. (Received Janurevised version accepted Ma)Īn extensive set of phase behavior measurements were carried out on mixtures of carbon dioxide with a Canadian Petroleum Recovery Institute, 3512-33 Street N. Oil and its constitutive fractions: Experimental data and Phase behavior and physical properties of C02-saturated heavy Journal o f Petroleum Science and Engineering, 9 ( 1993 ) 289-302Įlsevier Science Publishers B.V., Amsterdam
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