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首页> 外文期刊>International Journal of Heat and Mass Transfer >Coupling heat and mass transfer for determining individual diffusion coefficient of a hot C_3H_8-CO_2 mixture in heavy oil under reservoir conditions
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Coupling heat and mass transfer for determining individual diffusion coefficient of a hot C_3H_8-CO_2 mixture in heavy oil under reservoir conditions

机译：耦合传热传质确定储油条件下重油中热C_3H_8-CO_2混合物的单个扩散系数

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摘要

By characterizing heavy oil as multiple pseudocomponents, a generalized methodology has been developed to determine both apparent and individual diffusion coefficients by coupling heat and mass transfer for hot C_3H_8-CO_2-heavy oil systems under reservoir conditions with consideration of swelling effect. Experimentally, a visualized PVT setup has been used to conduct diffusion tests for hot C_3H_8-CO_2-heavy oil systems with different C_3H_8 concentrations under a constant pressure. The dynamic volume change of liquid-phase is monitored and recorded during the measurements. Theoretically, the volume-translated Peng-Robinson equation of state (PR EOS) with a modified alpha function has been incorporated to develop a two-dimensional heat and mass transfer model for the hot C_3H_8-enriched CO_2-heavy oil systems, while the heavy oil sample has been characterized as three pseudocomponents for accurately predicting phase behavior of the aforementioned systems. The binary interaction parameter (BIP) correlations are tuned with the experimentally measured saturation pressures, while the tuned BIPs are validated with the measured equilibrium swelling factors. Both the individual diffusion coefficient of each component and the apparent diffusion coefficients of C_3H_8-CO_2 mixtures are determined once the discrepancy between the measured and calculated dynamic swelling factors of heavy oil has been minimized. Compared to CO_2 alone, C_3H_8-CO_2 mixtures lead to enhanced swelling effect of heavy oil, while a higher C_3H_8 concentration achieves a faster dissolution and a larger dynamic swelling factor. Thus, C_3H_8 preferentially diffuses into heavy oil than CO_2 at the same conditions for C_3H_8-CO_2-heavy oil systems.
机译：通过将重油表征为多种假组分，开发了一种通用的方法，通过考虑储层条件下的热C_3H_8-CO_2-重油系统的传热和传质耦合，并考虑溶胀效应，从而确定表观扩散系数和单个扩散系数。在实验上，可视化PVT设置已用于在恒定压力下对具有不同C_3H_8浓度的C_3H_8-CO_2-重热油系统进行扩散测试。在测量过程中监测并记录液相的动态体积变化。从理论上讲，已合并具有修改后的alpha函数的体积转换的Peng-Robinson状态方程（PR EOS），以开发热的富含C_3H_8的CO_2重油系统的二维传热传质模型。油样已被表征为三个伪成分，用于准确预测上述系统的相态。二元相互作用参数（BIP）相关性通过实验测得的饱和压力进行了调整，而调整后的BIP则使用了测得的平衡溶胀因子进行了验证。一旦将重油的实测和计算的动态溶胀因数之间的差异最小化，就可以确定每种组分的单独扩散系数和C_3H_8-CO_2混合物的表观扩散系数。与单独的CO_2相比，C_3H_8-CO_2混合物可增强重油的溶胀效果，而更高的C_3H_8浓度可实现更快的溶出度和更大的动态溶胀因子。因此，在相同条件下，对于C_3H_8-CO_2-重油体系，C_3H_8优先扩散到重油中，而不是CO_2。

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