石油化工高等学校学报2025，Vol.38Issue(4)：43-50,8.DOI:10.12422/j.issn.1006-396X.2025.04.006
基于修正气液相平衡模型的微-纳米孔中油气相行为预测
Phase Behavior Modeling of Hydrocarbon Mixtures in Micro-Nano Pores Using a Modified Vapor-Liquid Equilibrium Model
摘要
Abstract
Improper models of phase behavior are a major cause of many production problems faced by shale gas reservoirs.The phase behavior of oil-gas in micro-nano pores is crucial for shale oil and gas development.Considering the effects of capillary pressure and critical point shift on the thermodynamic phase equilibrium in micro-nano pores,a vapor-liquid equilibrium(VLE)model in the confined micro-nano pores was developed by using a volume-translated Peng-Robinson Equation of State(PR-EOS),and the relative error of prediction was less than 1.53%.Based on the improved VLE model,the phase behavior of hydrocarbon mixtures such as Bakken shale oil in the confined space was investigated.Results indicate that the nanopore confinement decreases the vapor-liquid density difference and equilibrium coefficient(K)of the light components and shrinks the phase envelope.As the pore size decreases,the interfacial tension(IFT)first decreases slowly and then drops sharply,particularly when the pore radius is less than 20 nm.This study can provide an important theoretical foundation to support the development of unconventional oil-gas resources.关键词
微-纳米孔/气液相平衡/限域效应/相行为/地质封存Key words
Micro-nano pores/Vapor-liquid equilibrium/Confined effect/Phase behavior/Geological storage分类
能源科技引用本文复制引用
陈影影,杨付林,陈雄..基于修正气液相平衡模型的微-纳米孔中油气相行为预测[J].石油化工高等学校学报,2025,38(4):43-50,8.基金项目
国家自然科学基金项目(22268001). （22268001）
