多孔介质对富含CO2凝析气藏相态特征的影响
Influence of Porous Media on the Phase Behavior Characteristics of Condensate Gas Reserviors Rich in CO2
韩东 1张铜耀 2王萍 2唐磊 2张旭东 2王一帆 2张露 2易建强 1刘鹏飞1
作者信息
- 1. 中海石油(中国)有限公司海南分公司,海南 海口 570100
- 2. 中海油能源发展股份有限公司工程技术分公司,天津 300452
- 折叠
摘要
针对富含CO2 近临界态近饱和凝析气在PVT实验过程中轻烃抽提分层问题,为了解储层多孔介质对相态特征的影响,采用真实储层长岩心,开展了此类特殊凝析气藏地层流体连续通过多孔介质后的相行为实验研究和利用刻蚀模型对地层流体在高温高压、非平衡态下在储层中反凝析过程观测.结果表明,流体通过储层多孔介质后,初始阶段露点压力较PVT实验测试的结果偏低,富集流体井流物中中间烃含量较原始井流物含量减少,但随着地层流体连续通过储层岩心富集井流物组成中的中间烃含量逐渐增加,直至恢复与原始井流物中含量相同,露点压力与PVT实验测试的结果接近.研究成果为富含CO2 凝析气藏在储层中的相态特征精细化评价及开发方案制定提供了依据.
Abstract
Aiming at the problem of light hydrocarbon extraction and layering in the PVT experiment process of near-critical saturated condensate gas rich in CO2,in order to understand the influence of reservoir porous media on the phase behavior characteristics,the experimental study of the phase behavior of the formation fluid of this special condensate gas reservoir after continuous passing through the porous media was carried out using the real reservoir long core,and the observation of the formation fluid reverse condensation process in the reservoir under high temperature,high pressure and non-equilibrium state was carried out using the etching model.The results show that after the fluid passes through the reservoir porous media,the dew point pressure at the initial stage is lower than the result of PVT test,and the intermediate hydrocarbon content in the well fluid enriched by the fluid is lower than that of the original well fluid,but as the formation fluid continuously passes through the reservoir core,the intermediate hydrocarbon content in the well fluid composition gradually increases,until it is restored to the same content as the original well fluid,and the dew point pressure is close to the result of PVT test.The research results provide a basis for the refined evaluation of the phase characteristics of the CO2 rich condensate gas reservoir in the reservoir and the formulation of the development plan.
关键词
特殊凝析气藏/相态行为/中间烃吸附作用/微观反凝析可视化Key words
special condensate gas reservoir/phase behavior/intermediate hydrocarbon adsorption/microscopic retrograde condensation visualization引用本文复制引用
出版年
2024
NETL
NSTL
万方数据