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油藏多孔介质渗流过程存在多场耦合作用,目前的一些研究方法和分析模型具有一定局限性。本文将不可逆热力学原理应用于油藏复杂渗流过程,在局域平衡和连续性假设基础上,提出了基于表征单元体(Representative Elementary Volume,简称REV)的元胞描述方法;推导出了多孔介质渗流过程考虑导热和扩散作用的耦合方程;基于所建模型,分析了稠油热采过程的熵产变化特性。稠油热采过程除包括热传导和扩散耦合作用外,还包括黏滞流动和化学反应等不可逆过程,可根据本文模型扩展。
There are many coupling effects in porous media seepage process. Some current research methods and analytical models have some limitations. In this paper, the principle of irreversible thermodynamics is applied to the complex seepage process of reservoir. Based on the assumption of local equilibrium and continuity, a cell description method based on Representative Elementary Volume (REV) is proposed. The porous media seepage The process takes into account the coupled equations of thermal conductivity and diffusion. Based on the model, the entropy production and variation characteristics of heavy oil thermal recovery process are analyzed. In addition to the heat transfer and diffusion coupling, the heavy oil thermal recovery process also includes irreversible processes such as viscous flow and chemical reaction, which can be extended according to the model in this paper.