With the advancement in technology, interest in different enhanced oil recovery (EOR) techniques to recover this untapped oil has increased in recent years. The paper presents a fluid with extensive PVT and carbon dioxide (CO2) Swelling Test data from a major on-land field of Gujarat, India. The reservoir is at pressure of 2,860.7 psia and temperature of 192.2 °F. The reservoir is on depletion drive mechanism with very low gas/oil ratio of 16.2 (v/v). 12-component equation of state (EoS) models were developed for the fluid using the volume corrected Peng-Robinson EoS, which shows a good match between experimental and simulated data. Simulation of multi-contact process was carried out to predict the minimum miscibility pressure (MMP). Purely predictive MMP is considerably lower than the reservoir pressure which is the most important criteria for a miscible gas injection project and the simulation result shows a forward contact vaporizing gas drive mechanism of miscibility. The representative reservoir fluid sample was experimentally analyzed and the resulting data were used to obtain parameters for EoS model. The tuning procedure for EoS was carried out systematically by matching the volumetric and phase behavior results with that of the experimental results. Splitting method by Whitson et al was used to split plus fraction into 5 pseudo-components to increase the predictive capability of EoS. The EoS model developed for this field may be used in compositional reservoir simulation studies and well optimization for a miscible CO2 EOR.

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