Akademik Veri Yönetim Sistemi
In the context of enhanced oil recovery (EOR) techniques like miscible gas flooding, reducing the density of crude oil offers significant advantages throughout the oil production lifecycle. Flooding the oil reservoir with carbon dioxide (CO2) that has minimal compression costs is amongst the most common methods employed. This study investigates the temperature and density dependence of the minimum miscibility pressure (MMP) of three crude oils from the Southeast Anatolia region using the vanishing interfacial tension (VIT) technique at 40 degrees C, 60 degrees C, and 80 degrees C. A linear equation is developed for MMP prediction based on API gravity, molecular weight of heavy fractions, and temperature. The effect of addition of various solvents, methanol, ethanol, 2-butanol, n-hexane, cyclohexane, acetone, and diethyl ether (DEE) at concentrations of 1 wt%, 2 wt%, and 5 wt%, on the temperature dependent MMP reduction between CO2 and crude oils is investigated. All tested solvents reduced MMP, with methanol being the most effective achieving a reduction up to 550 psi at 5 wt% and 600 psi at 10 wt% concentration, both at 80 degrees C. Higher temperatures generally favored enhanced MMP reduction by solvent addition. Compared to CO2, alternative gases methane (CH4) and nitrogen (N2) exhibited significantly higher MMP values, making them less suitable for miscible flooding in the investigated crude oil systems. These findings offer valuable insights for optimizing CO2-based EOR projects. Selecting appropriate solvents and injection pressures can significantly improve oil recovery efficiency. The developed correlation for MMP prediction can be a useful tool for field applications.
