多相渗流的几种数学模型及相互关系

在注气提高采收率过程中,油藏流体各物质组分之间的相互传质以及由此引起的相变起着极其重要的作用。因此,研究油藏流体在传质和相变过程中的渗流规律是非常必要的。从相平衡和物质组分守衡规律出发,利用达西线性渗流定律,推导了多相渗流的通用数学模型。在此基础上,又导出了常用的多组分数学模型、适于注CO2的多组分数学模型和黑油模型。指出这三个模型都是通用数学模型的特例模型,它们的共同基础是相平衡和物质组分守衡规律。所导出的适合于注CO2驱的多相渗流数学模型,区别于Yih-Bor Chang,B.K.Coats的模型。

SEVERAL MATHEMATICAL MODELS AND THEIR INTER-RELATION ON MULTIPHASE FLUID FLOW

The conversion among the components and related phase change plays an important role in the process of improving the recovery by gas injection, so it is very necessary to study the fluid flow law on reservoir fluids in the course of conversion and phase change. The paper developed a common numerical model on multiphase fluid flow by Darcy Law based on phase equilibri-um and Mass Conservation Law, and then the black oil model and the multi-component model for CO2injection were devel-oped. The model for CO2injection is different from the others for CO2injection which were not enough to consider the mass conservation when the CO2gas was dissolved in water.