An EOS based simulation approach has been developed to examine various oil recovery mechanisms for CO 2 huff-n-puff process and to carry out the production evaluation using this process for oil reservoirs. These recovery mechanisms include the swelling effect, viscosity reduction, relative permeability effect, miscibility effect, gas solubility, gas extraction and diffusion, CO 2 impurity effect, gas penetration depth, and injection and production scheme considerations. The EOS huffn-puff simulation incorporates the relative permeability curves to account for mobility effect as well as the effects of different depletion schemes. A modeling procedure is described performing these mechanistic analyses and the huff-n-puff process simulation. The procedure provides quick evaluations for predicting the potential oil recovery, examining design parameters and optimizing the production scheme to maximize the oil recovery of the process. It also allows for quick screening of reservoir candidates for such a process. The results indicate that EOS simulation is a useful tool for evaluating gas Huff-n-Puff processes both in design stage and in production optimization.
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