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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.376 SNIP: 0.466 CiteScore™: 0.83

ISSN Imprimer: 2151-4798
ISSN En ligne: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2017021027
pages 307-324

A HEAT AND MASS TRANSFER COUPLING MODEL FOR TRANSITION INTERFACE OF EXPANDING SOLVENT STEAM-ASSISTED GRAVITY DRAINAGE

Hao Liu
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China
Linsong Cheng
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China
Yang Du
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China
Qian Huang
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China
Peng Xiao
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China

RÉSUMÉ

Expanding solvent steam-assisted gravity drainage (ES-SAGD) has been proved by field pilots that it is capable of increasing the production rate as well as lowering the steam–oil ratio. However, the evaluation of ES-SAGD based on a single-component solvent diffusion model always presents a large deviation between the prediction and practical data, due to the fact that a multicomponent solvent is actually employed on the field. In this paper, a heat and mass transfer coupling model for transition interface of multicomponent expanding solvent steam-assisted gravity drainage is established. In the model, the equation of state and the fugacity equation are integrated to calculate the equilibrium state of transition interface. Then, the transition interface model is built by consociating heat transfer expressions and gaseous phase convective equations. Finally, based on the temperature and velocity boundaries, the model is solved by applying the implicit Runge-Kutta method and the results are used to analyze the heat and mass transfer characteristics. Results show that increasing the fraction of the lighter solvent can accelerate mass transfer, but the heat transferred is seriously deteriorated. Besides, the closer the bubble point temperature and dew point temperature of the stream are, the smaller the elevation of mass transfer is, while the heat transfer is almost unaffected. Therefore, in order to achieve optimum effects of heat and mass transfer, solvents with a larger saturation temperature difference should be chosen and the composition should be optimized based on the formation thermal properties and solvent components.