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

Volume 8, Issue 4, 2017, pp. 307-324
DOI: 10.1615/SpecialTopicsRevPorousMedia.2017021027
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ABSTRACT

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.

CITED BY
  1. Cheng Linsong, Liu Hao, Huang Shijun, Wu Keliu, Chen Xiao, Wang Daigang, Xiong Hao, Environmental and economic benefits of Solvent-Assisted Steam-Gravity Drainage for bitumen through horizontal well: A comprehensive modeling analysis, Energy, 164, 2018. Crossref

  2. Liu Hao, Cheng Linsong, Wu Keliu, Huang Shijun, Maini Brij B., Assessment of energy efficiency and solvent retention inside steam chamber of steam- and solvent-assisted gravity drainage process, Applied Energy, 226, 2018. Crossref

  3. Huang Shijun, Chen Xiao, Liu Hao, Jiang Jun, Cao Meng, Xia Yun, Experimental and numerical study of solvent optimization during horizontal-well solvent-enhanced steam flooding in thin heavy-oil reservoirs, Fuel, 228, 2018. Crossref

  4. Sun Fengrui, Yao Yuedong, Li Guozhen, Li Xiangfang, Lu Chengang, Chen Zhili, A model for predicting thermophysical properties of water at supercritical state in offshore CDTW, Measurement, 124, 2018. Crossref

  5. Medina Oscar E., Hurtado Yira, Caro-Velez Cristina, Cortés Farid B., Riazi Masoud, Lopera Sergio H., Franco Camilo A., Improvement of Steam Injection Processes Through Nanotechnology: An Approach through in Situ Upgrading and Foam Injection, Energies, 12, 24, 2019. Crossref

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