ABSTRACT
This chapter discusses the processes involved in the characterization of reservoir fluids for enhanced oil recovery (EOR) processes, particularly those involving miscible displacements. Equation of states (EOS) is used to plan, quantify and guide the impact of field development operations on hydrocarbon recovery, particularly when an EOR agent is injected into the reservoir. Viscosity estimations are not done within the EOS, rather they use different correlations that are component based but are independent from the main EOS parameters and therefore are often calibrated separately. The chapter provides the majority of EOS follow a cubic equation and thus any calibration process follows the mathematical principles of regression, variable dependence, and of course optimization. Changes to molecular weight of the heavy fraction are often performed first during the calibration exercise, giving an extra weight to the calibration of the saturation locus. Calibration of a slimtube test requires building a 1D numerical model with the dimensions and properties of the laboratory experiment.
