水混溶二氧化碳充注过程中剩余油和二氧化碳的传质和微观分布特征的实验研究

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2024-09-01 DOI:10.1016/j.jcou.2024.102920
Lian Li , Yong Kang , Feng Liu , Yi Hu , Yong Huang , Siqi Wu
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引用次数: 0

摘要

准确了解和定量描述剩余油的微观分布和动员机制对于进一步提高二氧化碳充注过程中的石油采收率至关重要。本研究利用微计算机断层扫描技术进行了水淹后混溶二氧化碳淹没实验,以研究剩余油和二氧化碳的传质和微观分布特征。此外,还全面研究了多相流体(油、水和二氧化碳)在孔隙中的分布特征。此外,还系统研究了混合二氧化碳淹没过程中的传质效应以及二氧化碳封存率(SR)和封存系数(SF)。实验结果表明,混合二氧化碳充注后的最终采油系数分别为 80.9%、70.7% 和 64.7%。在水淹阶段,产出的石油主要是轻烃(C5-C16),其次是中烃(C17-C27)。剩余油主要呈团块状和网状,其次是多油状和油膜状。混溶 CO2 注入后,生成气体主要由 CO2 和 CH4 组成,生成油中轻烃(C5-C16)的质量分数显著增加。剩余油主要呈多子和单子形态,其次是网络和薄膜形态,小部分呈团簇形态。置换率越高,SR 越小,但大部分注入的 CO2(SR > 70 %)被保留在多孔介质中,这表明在混淹过程中进行 CO2 地质封存是可行的。
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Experimental study on the mass transfer and microscopic distribution characteristics of remaining oil and CO2 during water-miscible CO2 flooding

Accurate understanding and quantitative characterization of the microscopic distribution and mobilization mechanisms of remaining oil are crucial for further enhancing oil recovery during CO2 flooding. In this study, miscible CO2 flooding experiments after water flooding were performed to investigate the mass transfer and microscopic distribution characteristics of remaining oil and CO2 using micro-computed tomography technique. Additionally, the distribution characteristics of multiphase fluids (oil, water and CO2) in the pores were comprehensively investigated. Furthermore, the mass transfer effects during the miscible CO2 flooding process, as well as the CO2 sequestration ratio (SR) and sequestration factor (SF) were systematically examined. The experimental results show that the ultimate oil recovery factor after miscible CO2 flooding were 80.9 %, 70.7 %, and 64.7 %, respectively. During the water flooding stage, the produced oil mainly consisted of light hydrocarbons (C5–C16), followed by medium hydrocarbons (C17–C27). The remaining oil was mainly in cluster and network pattern, followed by multiple and oil film pattern. After miscible CO2 flooding, the produced gas mainly consisted of CO2 and CH4, with a significant increase in the mass fraction of light hydrocarbons (C5–C16) in the produced oil. The remaining oil was mainly in multiple and singlet pattern, followed by network and film pattern, with a small portion in cluster pattern. The higher the displacement rate, the smaller the SR, but most of the injected CO2 (SR > 70 %) was retained in the porous media, demonstrating the feasibility of CO2 geological sequestration during the miscible flooding process.

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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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