日用化学工业（中英文）2025，Vol.55Issue(12)：1526-1533,8.DOI:10.3969/j.issn.2097-2806.2025.12.004
CO2溶解气驱动用裂缝性致密油藏基质原油实验研究
Experimental study on recovering the matrix oil in fractured tight reservoirs by CO2 solution gas drive
摘要
Abstract
Tight oil reservoirs are typically developed through multi-stage fracturing,forming fracture-matrix dual-medium systems where the mobilization efficiency of matrix oil determines the ultimate recovery factor.CO2 flooding can mobilize matrix oil via solution gas drive;however,the dissolution-diffusion behavior of CO2 in matrix oil and its displacement characteristics remain unclear.In this work,constant-pressure dissolution-diffusion experiments and huff-n-puff tests on matrix cores were conducted,along with long-model CO2 huff-n-puff experiments,to investigate the efficiency and drainage depth of solution gas drive.The results indicated that the CO2 dissolution-diffusion under constant pressure during displacement exhibited limited effectiveness in mobilizing matrix oil,with recovery factors in the range of 11.8%-48%;lower pressures and longer core lengths would further reduce the efficiency.In contrast,CO2 huff-n-puff significantly enhanced the recovery by 30.8%-71.3%,with drainage depths exceeding 16 cm;higher pressures and longer core lengths could improve its performance.Additionally,in long-model huff-n-puff tests,the drainage depth within matrix oil increased with the number of cycles and the pressure.Specifically,for a 75 cm model at 20 MPa,the drainage depth exceeded 60 cm after 7 huff-n-puff cycles.Through the research on the mechanisms of CO2 solution gas drive for mobilizing the matrix oil in fractured tight reservoirs,this work could provide some insights for optimizing the development strategies and CO2 flooding operational parameters in such reservoirs.关键词
致密油藏/CO2溶解气驱/基质原油/排驱特征Key words
tight oil reservoir/CO2 dissolved gas drive/matrix oil/displacement characteristic分类
能源科技引用本文复制引用
刘凯,魏登峰,刘瑛,姚振杰,杨海峰,杨红,周亚楠..CO2溶解气驱动用裂缝性致密油藏基质原油实验研究[J].日用化学工业（中英文）,2025,55(12):1526-1533,8.基金项目
国家重点研发计划"二氧化碳提高油藏采收率与地质封存一体化关键技术及应用示范"(2022YFE0206700)资助 （2022YFE0206700）
延长石油项目"靖边油田天赐湾中-高含水油藏CO2驱提高采收率技术研究"(YCSY2025YYJC-B-18)资助 （YCSY2025YYJC-B-18）
