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首页> 外文期刊>Transport in Porous Media >The Effect of Heavy Oil Viscosity Reduction by Solvent Dissolution on Natural Convection in the Boundary Layer of VAPEX
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The Effect of Heavy Oil Viscosity Reduction by Solvent Dissolution on Natural Convection in the Boundary Layer of VAPEX

机译：溶剂溶解降低稠油粘度对VAPEX边界层自然对流的影响

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摘要

We have studied the effect of viscosity on natural convection in the boundary layer of the vapor extraction (VAPEX) process. VAPEX is a heavy oil recovery method that uses solvents to reduce oil viscosity, and is a potential process in reservoirs where thermal recovery methods cannot be applied. Natural convection may happen in VAPEX if the solvents that are used to decrease oil viscosity increase the density of the oil. This can especially occur with CO_2-based solvents. Reduction of the oil viscosity due to solvent dissolution can have a large impact on the onset of convection by decreasing the critical Rayleigh number. When the viscosity reduction is significant, the critical Rayleigh can decrease up to two orders of magnitude. The transverse Peclet number is also a crucial parameter in determining the critical Rayleigh and onset of convection. Our analysis shows that the longitudinal Peclet does not have a significant impact on the natural convention in VAPEX. When oil viscosity reduction is included in the analysis of boundary layer instability in VAPEX, natural convection may occur in high-permeable reservoirs (where Rayleigh number is high) leading to a greater oil production rate compared with current models where the effect of boundary layer instability has been ignored.
机译：我们已经研究了粘度对蒸气萃取（VAPEX）过程边界层中自然对流的影响。 VAPEX是一种重油采收方法，使用溶剂来降低油的粘度，在无法应用热采方法的油藏中是一种潜在的工艺。如果用于降低油粘度的溶剂增加了油的密度，则VAPEX中可能会发生自然对流。对于基于CO_2的溶剂，这尤其可能发生。通过降低临界瑞利数，由于溶剂溶解而导致的油粘度降低可能对对流的开始产生重大影响。当粘度降低显着时，临界瑞利可降低多达两个数量级。在确定临界瑞利和对流开始时，横向Peclet数也是关键参数。我们的分析表明，纵向Peclet不会对VAPEX中的自然约定产生重大影响。如果在VAPEX边界层不稳定性分析中包括降低油粘度，则与当前模型（边界层不稳定性影响）相比，高渗透性油藏（瑞利数较高）中可能发生自然对流，从而导致更高的产油率已被忽略。

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