石油科学通报2026，Vol.11Issue(3)：980-992,13.DOI:10.3969/j.issn.2096-1693.2026.03.016
基于相稳定性分析的油气相包络线计算新方法
A new method for oil and gas phase envelope construction based on phase stability analysis
摘要
Abstract
Stable and reliable calculation of phase envelopes for hydrocarbon systems is a key and challenging aspect of reser-voir fluid phase behavior research.The saturation pressure curve tracing algorithm proposed by Michelsen represents a milestone contribution in this field and is still widely used today.However,this method involves complex technical details,making it difficult to implement correctly,and is prone to non-convergence issues during computation,which may prevent the generation of a complete phase diagram.This paper presents a novel method for accurately constructing phase diagrams of oil and gas hydrocarbon systems based on phase stability analysis combined with the bisection method.In this approach,phase stability analysis is first used to compute the cricondenbar and the cricondentherm on the phase envelope.Based on these two points,the pressure-temperature plane is divided into four regions.Within each region,the phase boundary is located using a combination of phase stability analysis and the bisection method,ultimately leading to the construction of a complete phase diagram.The pro-posed method is applied to compute phase diagrams of various reservoir fluids,and the results are compared with those obtained using Michelsen's method.The comparison demonstrates that the proposed algorithm is capable of calculating phase diagrams of oil and gas hydrocarbon systems reliably and stably.关键词
相图/相包络线/稳定性分析/饱和压力/二分法Key words
phase diagram/phase envelope/stability analysis/saturation pressure/bisection method分类
能源科技引用本文复制引用
赵海宁,吴浩楠,贺帅铭..基于相稳定性分析的油气相包络线计算新方法[J].石油科学通报,2026,11(3):980-992,13.基金项目
国家自然科学基金面上项目"纳米级孔径和矿化度对油气藏CO2-烃-咸水体系相态影响机理"(52474061)资助 （52474061）
