特种油气藏2026，Vol.33Issue(3)：79-88,10.DOI:10.3969/j.issn.1006-6535.2026.03.009
不同驱油方式下提高页岩油采收率实验评价
Experimental evaluation of improving shale oil recovery efficiency under different displacement patterns
摘要
Abstract
Chang 7 shale oil in Ordos Basin is characterized by high initial output,rapid decline and low depletion development recovery efficiency,thus requiring urgent and effective enhanced oil recovery(EOR)methods.Based on core analysis results from high-pressure mercury intrusion(HPMI),scanning electron microscopy(SEM),casting thin sections(CTS),and low-field nuclear magnetic resonance(NMR),the pore structure of the target reservoir was classified and evaluated.Experiments were then carried out on oil displacement by fracturing fluid imbibition,fractu-ring fluid+surfactant imbibition displacement,and CO2 huff-and-puff displacement,to investigate the crude oil pro-duction characteristics in different pore size ranges and the EOR effectiveness of the three patterns.An EOR method integrating fracturing and displacement was proposed to improve shale oil recovery.The experimental results show that the pore structure of the target shale reservoir can be classified into types I-Ⅲ,with reservoir physical proper-ties deteriorating sequentially from I to Ⅲ.Among the three oil displacement patterns,CO2 huff-and-puff achieves the highest recovery efficiency,followed by fracturing fluid+surfactant imbibition,and fracturing fluid imbibition the lowest.For a given pattern,type I shale yields the highest recovery,with types Ⅱ and Ⅲ decreasing in turn.For type I shale,ordinary slickwater can be used as the fracturing fluid;for type Ⅱ,adding a surfactant to the fracturing fluid is recommended;for type Ⅲ,CO2 can be used as a pre-slug in the fracturing fluid.Compared with ordinary slickwa-ter,adding an anionic surfactant(LAS)to the fracturing fluid increases the average daily oil output per well by 2.4 times.The research results can provide reference for improving shale reservoir development efficiency.关键词
页岩油/压裂液/表面活性剂/CO2吞吐/孔隙结构/核磁共振Key words
shale oil/fracturing fluid/surfactant/CO2 huff-and-puff/pore structure/NMR分类
能源科技引用本文复制引用
刘秀婵,张添锦,赵帮胜,王雨欣..不同驱油方式下提高页岩油采收率实验评价[J].特种油气藏,2026,33(3):79-88,10.基金项目
国家自然科学基金地区科学基金项目"矿物脉体示踪富有机质页岩中烃类流体形成与演化:以大巴山构造带下寒武统为例"(4236020162) （4236020162）
2023年省级大学生创新创业训练计划项目"鄂尔多斯盆地中南部长7页岩储层在单渗透条件下内部构型分析及页岩油赋存机理研究"(S202310719118) （S202310719118）
