日用化学工业（中英文）2025，Vol.55Issue(3)：305-312,8.DOI:10.3969/j.issn.2097-2806.2025.03.005
裂缝性特低渗透油藏CO2复合封窜体系适应性研究
Study on the adaptability of CO2 composite channeling plugging system in fractured ultra-low permeability reservoirs
摘要
Abstract
The Yanchang oilfield is characterized as a fractured,ultra-low permeability reservoir with low permeability,strong heterogeneity,and a complex network of natural micro-fractures and artificial fractures.It is also influenced by high salinity of formation water,high mass concentration of Ca2+,and weakly acidic formation water during the CO2 flooding process,making conventional plugging systems unsuitable.In this work,the performance of a composite plugging system was evaluated,the injection parameters were optimized,and the slug size and combination method were also optimized.The adaptability of the system was verified through radial flow simulation of injection and production.The results showed that the foam composed of 0.2%AOS+0.2%MX-20+0.4%HPAM exhibited the best comprehensive performance,with a foam volume of 510 mL and a half-life of 3 940 seconds.The optimal gas-liquid ratio,injection rate,and injection volume were 3∶1,0.3 mL/min,and 0.4 PV,respectively.The gel was compatible with CO2,and its strength could meet the requirements for plugging fractures.The optimal slug size and combination method for the composite channeling plugging system were 0.1 PV gel+0.4 PV foam+0.1 PV gel.The validation experiment with radial flow model demonstrated that the composite system had good adaptability in fractured low-permeability oil reservoirs.关键词
裂缝性特低渗透油藏/CO2驱/复合封窜/CO2泡沫/聚合物凝胶/延长油田Key words
fractured ultra-low permeability reservoir/CO2 flooding/composite channeling/CO2 foam/polymer gel/Yanchang oilfield分类
化学工程引用本文复制引用
杨红,杨康,刘瑛,沈振振,刘凯,刘芳娜,汪章超..裂缝性特低渗透油藏CO2复合封窜体系适应性研究[J].日用化学工业（中英文）,2025,55(3):305-312,8.基金项目
国家重点研发计划项目(2022YFE0206700) （2022YFE0206700）
