Experiment on electric field-enhanced CO2-oil miscibility flooding in tight sandstone reservoirs

doi:10.7623/syxb202604010

Acta Petrolei Sinica ›› 2026, Vol. 47 ›› Issue (4): 881-892.DOI: 10.7623/syxb202604010

• OIL FIELD DEVELOPMENT • Previous Articles

Experiment on electric field-enhanced CO₂-oil miscibility flooding in tight sandstone reservoirs

Zhang Wentong¹, Wang Ruorong², Huang Hai², Ning Zhengfu³, Li Zheng⁴, He Yanlong², Yang Bing², Zheng Yong²

1. College of New Energy, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
2. College of Petroleum Engineering, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
3. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China;
4. National Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu University of Technology, Sichuan Chengdu 610500, China

Received:2025-07-06 Revised:2026-03-10 Published:2026-05-11

电场强化致密砂岩储层CO₂驱油气混相实验

张文通¹, 王若榕², 黄海², 宁正福³, 李正⁴, 何延龙², 杨兵², 郑永²

1. 西安石油大学新能源学院陕西西安 710065;
2. 西安石油大学石油工程学院陕西西安 710065;
3. 油气资源与工程全国重点实验室, 中国石油大学(北京) 北京 102249;
4. 成都理工大学油气藏地质及开发工程全国重点实验室四川成都 610500

通讯作者: 黄海,男,1981年11月生,2012年获西北大学博士学位,现为西安石油大学石油工程学院教授,主要从事油气资源绿色开发与多能互补方面的研究。Email:huanghai@xsyu.edu.cn
作者简介:张文通,男,1993年2月生,2022年获中国石油大学(北京)博士学位,现为西安石油大学新能源学院讲师,主要从事电场强化非常规油气资源绿色开发相关研究。Email:wentong0202@xsyu.edu.cn
基金资助:
国家自然科学基金项目(No.U23B2089,No.51974330)和陕西省自然科学基金青年项目(2024JC-YBQN-0601)资助。

Abstract

Abstract: This study aims to tackle the challenges of underutilized wind and solar-generated green electricity in oilfields under the context of renewable energy and the difficulty of achieving CO₂-oil miscibility in field applications. Laboratory experiments reveal that electric fields can enhance oil-gas miscibility during CO₂ flooding. On this basis, a novel "Electric Field + CCUS" model for field applications is proposed. Experimental results demonstrate that electric fields can significantly improve CO₂ flooding efficiency in tight sandstone reservoirs, with an optimal electric field strength identified. Specifically, an electric field strength of 1 V/cm yielded the best oil displacement efficiency of 71.25 %, representing a 28.75 % increase compared to the 55.34 % efficiency observed without the electric field. Gas chromatography and Fourier transform infrared spectroscopy analyses of crude oil at the outlet under varying electric field intensities indicate that the electric field contributes to a decrease in the content of heavy components and an increase in that of medium components. Based on the component analysis of crude oil, single alkanes were used to reconstitute simulated oil blends. High-temperature and high-pressure visual reactor experiments demonstrate that the minimum miscibility pressure (MMP) of the simulated oil treated with the electric field is 21.6 MPa, exhibiting a 4 % reduction compared to the MMP of 22.5 MPa before application of the electric field. The study shows that electric fields can enhance CO₂-oil miscibility by modulating crude oil components, thereby improving CO₂ flooding efficiency. This provides both theoretical and technical support for the large-scale application of the "Electric Field+CCUS" model in oilfields.

Key words: new energy, crude oil exploitation, electric field, tight sandstone, CO₂ flooding, miscibility, minimum miscibility pressure

摘要： 针对新能源背景下油田生产的绿电资源难以消纳及CO₂驱矿场应用中油气难以混相的难题,经过室内实验发现电场可以强化储层CO₂驱油气混相,提出面向矿场应用的"电场+CCUS"新模式。实验结果表明:电场可以有效提高致密砂岩储层CO₂驱油效率,且存在最佳的电场强度,其中,以1 V/cm的电场强度作用效果最好,可促使驱油效率达到71.25%,相比未加电场作用下的驱油效率(55.34%),增幅可达28.75%;通过对不同电场强度下的出口端原油开展气相色谱和傅里叶红外光谱分析发现,电场可以促使原油中的重质组分含量下降,中质组分含量上升;基于原油组分结果利用单烷烃形成复配模拟油,采用高温高压可视化反应釜开展油气混相实验发现,电场作用后的模拟油最小混相压力为21.6 MPa,相比电场施加前的模拟油最小混相压力(22.5 MPa),最小混相压力下降了4%。研究表明,电场通过调控原油组分增强CO₂—原油的混相能力,进而提高了CO₂驱油效果,为"电场+CCUS"新模式在矿场规模化应用提供理论和技术支撑。

关键词: 新能源, 原油开采, 电场, 致密砂岩, CO₂驱, 混相, 最小混相压力

CLC Number:

TE357

Zhang Wentong, Wang Ruorong, Huang Hai, Ning Zhengfu, Li Zheng, He Yanlong, Yang Bing, Zheng Yong. Experiment on electric field-enhanced CO₂-oil miscibility flooding in tight sandstone reservoirs[J]. Acta Petrolei Sinica, 2026, 47(4): 881-892.

张文通, 王若榕, 黄海, 宁正福, 李正, 何延龙, 杨兵, 郑永. 电场强化致密砂岩储层CO₂驱油气混相实验[J]. 石油学报, 2026, 47(4): 881-892.

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Experiment on electric field-enhanced CO₂-oil miscibility flooding in tight sandstone reservoirs

电场强化致密砂岩储层CO₂驱油气混相实验

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