气体–原油分子扩散系数实验研究进展

Experimental Study of Molecule Diffusion Coefficient for Gas-Oil System

摘要: 在注气驱油的过程中，当气体与原油接触时，气体与原油间就会发生传质现象，改变原油流体性质，改善原油流动能力，从而提高采收率。分子扩散系数是一个描述气–油体系传质率的重要参数，目前多以间接方法来测试分子扩散系数。确定扩散系数两个关键问题是：1) 确定合理的实验方法；2) 选择准确的模型来解释实验数据。本文综述了气–油分子扩散系数的实验及模型研究进展，包括确定分子扩散系数的实验方法和分子扩散系数的影响因素。

Abstract: During the process of gas flooding, when the gas comes in contact with oil, the mass transfer phenomenon occurs. It change properties and improve flow ability of oil fluid to enhance oil recovery. Diffusion coefficient of gas-oil systems is the most important factor to determine the transfer rate of species from one phase to another. The conven-tional experimental methods used in diffusion coefficient determination are classified into direct and indirect, and the later is used greatly. However, the determination of diffision coefficient requires two important decisions: 1) to define a reliable experimental method; and 2) to choose accurate models for data interpretation. The present paper is aimed at reviewing experimental and modeling studies on diffusion coefficient for gas-oil system, to provide some reference for the future research. The focus of the analysis is three aspects. First, we review the experimental methods of determining diffusion coefficient for gas-oil system. Second, the pressure decay method and models are presented. Finally, we re-view the influencing factors of determining diffusion coefficient.