基于计算流体力学方法的CO_(2)驱油与埋存微观规律  

Microscopic Mechanisms of CO_(2)Flooding and Sequestration Based on Computational Fluid Dynamics Methods

作　　者：黄子俊 张雪娜[1,2,3] 雷伴雨 宫汝祥 刘伟伟 郑玉飞[1,2,3] 薄振宇 朱彤宇 李宗法[4] HUANG Zijun;ZHANG Xuena;LEI Banyu;GONG Ruxiang;LIU Weiwei;ZHENG Yufei;BO Zhengyu;ZHU Tongyu;LI Zengfa(National Key Laboratory of Efficient Offshore Oil and Gas Development,Beijing 102209,China;Tianjin Key Laboratory of Offshore Oil Difficult-to-Use Reserve Exploitation,Tianjin 300459,China;Oilfield Production Division,China National Offshore Oilfield Services Company Limited,Tianjin 300459,China;College of Petroleum Engineering,Yangtze University,Wuhan 430199,China)

机构地区：[1]海洋油气高效开发全国重点实验室,北京102209 [2]天津市海洋石油难动用储量开采重点实验室,天津300459 [3]中海油田服务股份有限公司油田生产事业部,天津300459 [4]长江大学石油工程学院,武汉430199

出　　处：《华南师范大学学报(自然科学版)》2024年第6期26-34,共9页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51922007)。

摘　　要：多孔介质内CO_(2)驱油与埋存过程受孔喉结构、受力情况、CO_(2)-油混相程度和流体物性变化的共同影响。基于计算流体力学(CFD)方法,提出一种CO_(2)驱油与埋存孔隙尺度数值模拟方法,以讨论孔喉结构、受力情况、CO_(2)-油混相程度与流体物性变化等因素对CO_(2)驱油与埋存效果的影响。模拟结果表明:CO_(2)混相驱油初期,流体对流是影响原油采出与碳埋存程度的关键因素。在CO_(2)混相驱油与埋存阶段后期,受真实多孔介质复杂孔隙结构影响,扩散是盲端、角隅等孔隙结构内油组分与CO_(2)混合、采出及实现CO_(2)埋存的基本机制,扩散可使原油采出程度进一步提高18.14%。流体密度和黏度降低能够有效增强主渗流区域内油/CO_(2)组分的浓度梯度,从而显著提升各组分的扩散效率,进而提高CO_(2)驱油与埋存效率。研究结果可为矿场CO_(2)驱油与埋存过程提供理论支持。The CO_(2)flooding and sequestration processes in porous media are influenced by various factors,including pore throat structure,stress conditions,CO_(2)-oil miscibility,and variations in fluid properties.A pore-scale numerical simulation method based on computational fluid dynamics(CFD)is presented to investigate the effects of these microscopic factors on the efficiency of CO_(2)flooding and sequestration.Simulation results indicate that fluid convection plays a crucial role in crude oil recovery and carbon sequestration during the initial phase of CO_(2)miscible flooding.In the later stages of the process,diffusion emerges as the fundamental mechanism for the mixing of oil components with CO_(2),their extraction,and the achievement of CO_(2)sequestration within complex pore structures such as dead ends and corners,due to the intricacies of the porous media.This diffusion mechanism can enhance crude oil recovery by up to 18.14%.Furthermore,reductions in fluid density and viscosity significantly increase the concentration gradient of oil/CO_(2)components in the primary permeable area,thereby markedly improving the diffusion efficiency of each component and accelerating the overall efficiency of CO_(2)flooding and sequestration.The findings provide theoretical support for CO_(2)flooding and sequestration processes in practical applications.

关 键 词：计算流体力学 孔隙尺度 混相驱 CO_(2)埋存 

分 类 号：O647.32[理学—物理化学]