ABSTRACT
Miscible EOR corresponds to the injection of a fluid (solvent) that is completely miscible with the reservoir oil, eliminating the forces that cause oil retention in the rock matrix and sweeping the solvent-oil mixture to the production well. The importance of the minimum miscibility pressure (MMP), the achievement of miscibility, and the miscible displacement processes through first-contact miscible (FCM) flooding and multi-contact miscible (MCM) flooding are described in detail. This chapter also includes the thermodynamics of miscibility, phase behaviors, and the mechanisms of different miscible displacement processes. The factors influencing the efficiency of miscible flood oil recovery and the mechanisms of water alternating miscible gas injection are also included. Finally, the design aspects of miscible flooding, feasibility and screening criteria, along with some case studies, are discussed.
