西安石油大学学报（自然科学版）2026，Vol.41Issue(3)：83-91,9.DOI:10.3969/j.issn.1673-064X.2026.03.009
超临界CO2吞吐提高页岩油采收率实验评价
Experimental Evaluation of Supercritical CO2 Huff-n-puff Improving Shale Oil Recovery
摘要
Abstract
The effects of gas injection pressure,huff-n-puff times,and permeability on shale oil recovery rate were systematically studied through CO2 huff-n-puff experiments and nuclear magnetic resonance testing under high temperature and high pressure conditions,and the utilization characteristics and remaining oil distribution of shale oil in different pore structures were quantitatively analyzed.The ex-perimental results showed that the micropores(r<0.026 μ m)and small pores(0.026≤r<0.325 μ m)in the experimental shale were well developed,with a volume ratio of 65.23%～80.16%.The optimal gas injection pressure is 15～18 MPa,the optimal huff-n-puff times is 4,and as the permeability increases,the huff-n-puff recovery rate also increases.CO2 huff-n-puff prioritizes driving crude oil in mesopores(0.325≤r<4.064 μ m)and macropores(r≥4.064 μ m);As the huff-n-puff times increases,the crude oil utiliza-tion proportion in small pores and mesopores first increases and then decreases,while the crude oil utilization proportion in macropores gradually decreases and the crude oil utilization proportion in micropores increases.The remaining oil is mainly concentrated in micro-pores and small pores,with volume proportions of 49.83%～67.14%and 31.56%～46.27%,respectively.Further improving the re-covery rate of crude oil from pores with a pore size less than 0.325 μ m is the key to achieving increased and stable production of shale oil.关键词
采出程度/CO2 吞吐/孔隙结构/影响因素/核磁共振/页岩油Key words
recovery degree/CO2 huff-puff/pore structure/influencing factor/nuclear magnetic resonance/shale oil分类
能源科技引用本文复制引用
张葳,张俊琳,李希娟,王昊,任皓洁,白海峰..超临界CO2吞吐提高页岩油采收率实验评价[J].西安石油大学学报（自然科学版）,2026,41(3):83-91,9.基金项目
国家重点研发计划"CO2驱油技术及地质封存安全监测"(2018YFB0605500) （2018YFB0605500）
国家科技重大专项"玉门油田重上百万吨勘探开发关键技术研究"(2017ZX05001) （2017ZX05001）
