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首页> 外文期刊>Special topics & reviews in porous media >A HEAT AND MASS TRANSFER COUPLING MODEL FOR TRANSITION INTERFACE OF EXPANDING SOLVENT STEAM-ASSISTED GRAVITY DRAINAGE
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A HEAT AND MASS TRANSFER COUPLING MODEL FOR TRANSITION INTERFACE OF EXPANDING SOLVENT STEAM-ASSISTED GRAVITY DRAINAGE

机译：溶剂蒸汽辅助重力排水过渡界面传热传质耦合模型

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摘要

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.
机译：现场试验证明，扩展溶剂蒸汽辅助重力排水（ES-SAGD）能够提高生产率，并降低蒸汽-油比。但是，由于在现场实际使用了多组分溶剂，因此基于单组分溶剂扩散模型对ES-SAGD的评估始终在预测数据与实际数据之间存在较大偏差。建立了多组分膨胀溶剂蒸汽辅助重力排水过渡界面的传热传质耦合模型。在模型中，将状态方程和逸度方程相结合以计算过渡界面的平衡状态。然后，通过结合传热表达式和气相对流方程建立过渡界面模型。最后，基于温度和速度边界，应用隐式Runge-Kutta方法求解该模型，并将结果用于分析传热和传质特性。结果表明，增加较轻溶剂的比例可以加速传质，但传热会严重恶化。此外，物流的泡点温度和露点温度越近，传质的高度越小，而传热几乎不受影响。因此，为了获得最佳的传热传质效果，应选择饱和温差较大的溶剂，并根据地层的热学性质和溶剂成分对组成进行优化。

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