扩散吸附作用下CO2非混相驱微观渗流特征模拟

doi:10.12108/yxyqc.20240617

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (6): 181–188.doi: 10.12108/yxyqc.20240617

• 石油工程与油气田开发 • 上一篇

扩散吸附作用下CO₂非混相驱微观渗流特征模拟

崔传智¹, 李静¹, 吴忠维²

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 长江大学石油工程学院, 武汉 430100

收稿日期:2023-07-04 修回日期:2023-09-17 出版日期:2024-11-01 发布日期:2024-11-04
第一作者:崔传智（1970—）,男,博士,教授,主要从事油气渗流理论、油气田开发技术的教学与研究工作。地址:（266580）山东省青岛市黄岛区长江西路66号。Email:ccz2008@126.com
基金资助:
国家自然科学基金面上项目“致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法”（编号：51974343）资助。

Simulation of microscopic seepage characteristics of CO₂ immiscible flooding under the effect of diffusion and adsorption

CUI Chuanzhi¹, LI Jing¹, WU Zhongwei²

1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
2. School of Petroleum Engineering, Yangtze University, Wuhan 430100, China

Received:2023-07-04 Revised:2023-09-17 Online:2024-11-01 Published:2024-11-04

摘要/Abstract

摘要： 利用数值模拟方法建立CO₂非混相驱数值模型，使用水平集法模拟扩散吸附作用下CO₂非混相驱和近混相驱的微观渗流规律，并对CO₂在孔隙中的微观渗流特征及扩散吸附特征进行研究，选取注入速度、扩散系数、吸附反应速率常数等参数研究近混相驱微观渗流特征的影响因素。研究结果表明：①相场法CO₂驱数值模拟采出程度为51.29%，水平集法CO₂驱数值模拟采出程度为53.60%，因此水平集法更适用于CO₂非混相驱的渗流过程模拟。②非混相驱条件下，CO₂优先向大孔隙扩散，采收率为87.7%，出口气体体积分数为71.60%，CO₂最大表面吸附浓度为3.16×10^-4 mol/m²；近混相驱条件下，CO₂更易向小孔隙扩散，采收率为91.1%，出口含气率为97.01%，CO₂最大表面吸附浓度为5.81×10^-4 mol/m²。③近混相驱微观渗流特征受注入速度、扩散系数、吸附反应速率常数等因素影响。注入速度增大，出口含气率和采收率均提高；扩散系数和吸附反应速率常数增大，会使采收率提高，出口含气率下降。

关键词: CO₂非混相驱, 微观渗流特征, 注入速度, 扩散系数, 吸附反应速率常数, 采收率, 数值模拟

Abstract: Based on a two-dimensional model，a numerical simulation method was used to establish a numerical model of CO₂ immiscible flooding，and the level set method is used to simulate the microscopic seepage laws of CO₂ immiscible flooding and near miscible flooding under diffusion and adsorption. The microscopic seepage characteristics and diffusion adsorption characteristics of CO₂ in pores were studied，and the influences of the injection velocity，diffusion coefficient，and adsorption reaction rate constant on the microscopic seepage charac teristics of near miscible flooding were analyzed. The results show that：（1）The degree of reserve recovery of the CO₂ flooding numerical simulation using the phase field method is 51.29%，and the degree of reserve recov ery of theCO₂ flooding numerical simulation using the level set method is 53.60%. The level set method is more suitable for simulating the seepage process of CO₂ immiscible flooding.（2）Under immiscible flooding condi tions，CO₂ preferentially diffuses into large pores，with a recovery efficiency of 87.7%，an outlet gas content rate of 71.60%，and a maximumCO₂ surface adsorption concentration of 3.16×10^-4 mol/m². Under the conditions of near miscible flooding，CO₂ is more likely to diffuse into small pores，with a recovery efficiency of 91.1%，an outlet gas content rate of 97.01%，and a maximum CO₂ surface adsorption concentration of 5.81×10^-4 mol/m². （3）The microscopic seepage of miscible flooding is influenced by factors such as the injection velocity，diffu sion coefficient，and adsorption reaction rate constant. The injection rate increases，resulting in an increase in both the gas content and recovery rate at the outlet. An increase in diffusion coefficient and adsorption reaction rate constant will lead to an increase in recovery efficiency and a decrease in outlet gas content.

Key words: CO₂ immiscible flooding, microscopic seepage characteristics, injection velocity, diffusion coeffi cient, adsorption reaction rate constant, recovery efficiency, numerical simulation

中图分类号:

TE357.45

崔传智, 李静, 吴忠维. 扩散吸附作用下CO₂非混相驱微观渗流特征模拟[J]. 岩性油气藏, 2024, 36(6): 181–188.

CUI Chuanzhi, LI Jing, WU Zhongwei. Simulation of microscopic seepage characteristics of CO₂ immiscible flooding under the effect of diffusion and adsorption[J]. Lithologic Reservoirs, 2024, 36(6): 181–188.

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扩散吸附作用下CO₂非混相驱微观渗流特征模拟

Simulation of microscopic seepage characteristics of CO₂ immiscible flooding under the effect of diffusion and adsorption

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