注气混相驱机理评价方法

室内实验研究和相应的模拟研究是混相驱机理研究和油藏注气工程评价的基础,在此基础上提出了注气压力-组成实验、多级接触实验的相平衡计算理论模型。建立了应用状态方程和现有的工程工具模拟实验室PVT(压力、体积、温度)数据,拟合注气压力-组成实验、 混相和非混相细管实验来对注气驱的混相能力及驱替机理进行系统评价的方法。通过对一个具体的油藏注气混相驱混相能力及驱替机理的评价,验证了所建立的通过扩展实验室结果的评价方法,可为油田注气混相驱设计提供可靠的室内和理论评价依据。

On Evaluation Method of Miscible Gas Flooding Mechanism

Indoor lab study and corresponding modeling are the bases of researching miscible gas-flooding mechanisms and evaluating gas injection projects. This paper presents a theoretical model of phase equilibrium estimation for pressure-composition and multi-contact miscible experiments of gas injection, creates a systematic evaluation method of gas-flooding miscibility and displacing mechanism by simulating PVT data and matching the pressure-composition experiment and miscible-immiscible flood slim-tube experiment by means of Equation of State and available tools. Taking a real reservoir as an evaluating case, such a method established from lab study has been validated, hence can be used to provide reliable lab and theoretical bases for evaluation of design of miscible gas-flooding project of oilfields.