Effect of non-equilibrium mass transfer in miscible gas recovery processes

• Autor(a) principal: Fernandes, Bruno Ramon Batista
• Data de Publicação: 2013
• Outros Autores: Lima, Ivens da Costa Menezes, Drumond Filho, Edilson Pimentel, Marcondes, Francisco, Sepehrnoori, Kamy
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/61841
• topic: Non-equilibrium; Mass transfer; Condensate reservoirs; EOS; UTCOMP; Simulator

The mass transfer equilibrium is a condition usually assumed to solve EOS and flash equations. However, this condition is not always true for all reservoirs, especially in regions near high-rate gas wells. For such wells, the fluids take seconds to run through a gridblock near the wellbore, and there is not enough time to achieve the equilibrium mass transfer. This paper presents a model to evaluate the non-equilibrium condition based on an empirical correlation from the literature. It takes into account the effects of diffusion coefficients and gas velocity to calculate the non-equilibrium saturations of the components. The simulation is performed in a gas-condensate reservoir, and the results are compared with the ones obtained with the local-equilibrium consideration. The simulator used was the UTCOMP compositional simulator, developed at The University of Texas at Austin.