Analytical models for predicting oil recovery from immiscible CO2 injection: A literature review

Abstract

The enhanced oil recovery is applied to increase oil recovery from oil reservoirs. The immiscible CO2 injection oil recovery method is suitable for reservoirs with low pressure. This paper presents a review of literature focusing on CO2 injection by focusing on three aspects. First, screening reservoir parameters are reviewed to assess their practicality for immiscible CO2 injection. These criteria are also used to deduce the governing reservoir parameters included in the analytical model to calculate the oil recovery factor. Second, analytical models used for oil recovery using reservoir parameters and operational variables are reviewed. Third, the criteria for choosing parameters to be included in the analytical model are discussed. Researchers have proposed reservoir permeability, reservoir porosity, oil density, oil viscosity, the interfacial tension between oil and CO2, injection pressure, and Darcy's velocity as critical parameters in the analytical model for oil recovery calculations. The research gaps and future research direction are also discussed. 2022 Elsevier B.V.