Abstract
Summary A comprehensive laboratory study of N2 miscible flooding for enhanced recovery of light crude oil was performed. The minimum miscibility pressure (MMP) of N2 is a major constraint to its EOR application, so an empirical correlation for MMP estimation was developed and found to be reliable. Supporting work included many in-house slim-tube displacement determinations of MMP and the compilation and analysis of previously published data. The reservoir fluid composition, especially the amounts of the methane and ethane-through-pentane fractions, was found to be the major determining factor for miscibility. High-pressure core flooding tests with sandstone cores were performed to evaluate the effects of gravity stability and injection mode on the N2 miscible process. N2-gas miscible flooding successfully recovered most of the oil from laboratory cores. Gravity-stable and gravity-unstable displacements gave different oil recoveries, as did secondary and tertiary N2 displacements.
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