西安石油大学学报（自然科学版）2024，Vol.39Issue(5)：10-18,9.DOI:10.3969/j.issn.1673-064X.2024.05.002
页岩微纳孔隙流体分布及CO2吞吐动用特征
Distribution of Fluid in Micro-Nano Pores of Shale and Moving Characteristics of It in CO2 Huff-Puff Production
摘要
Abstract
In order to clarify the pore type and fluid type effectively utilized in CO2 huff-puff of shale,based on low field nuclear mag-netic resonance(NMR),the centrifugation,heat treatment and CO2 huff-huff experiments of shale cores were carried out to accurately i-dentify T2 cutoff values of movable fluid,capillary bound fluid and clay bound fluid,and to study the utilization laws of different types of fluids in pores of different sizes.The experimental results show that the average saturation of movable fluid,capillary bound fluid and clay bound fluid is 24.0％,33.8％and 42.18％respectively.The oil produced by CO2 huff-puff is mainly from the first two cycles of huff and puff,and mainly from the mobile fluid in large and medium pores(relaxation time is greater than 10 ms).The oil produced by subsequent cycles of huff-puff is mainly from the capillary bound fluid in small and medium pores,and the utilized capillary bound fluid only accounts for 23.1％～37.8％of the total capillary bound fluid.The remaining fluid after huff and puff is mainly capillary bound fluid and clay bound fluid,and the clay bound fluid can not be utilized by CO2 huff-puff.Improving the recovery degree of the capillary bound fluid in medium pores(relaxation time is 10～100 ms)is the key to increase and stabilize shale oil production in the future.关键词
CO2吞吐/束缚流体/可动流体/孔隙结构/核磁共振/页岩Key words
CO2 huff-puff/bound fluid/movable fluid/pore structure/nuclear magnetic resonance/shale分类
能源科技引用本文复制引用
张瑞,贾焱,黄熙,陈琦,刘乘宙,茹琦..页岩微纳孔隙流体分布及CO2吞吐动用特征[J].西安石油大学学报（自然科学版）,2024,39(5):10-18,9.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）
