特种油气藏2024，Vol.31Issue(4)：133-141,9.DOI:10.3969/j.issn.1006-6535.2024.04.017
中低渗砂岩油藏水驱后期油藏再评价及提高采收率对策
Re-evaluation of Medium-low Permeability Sandstone Reservoirs in the Later Stage of Water Flooding and Strategies to Improve Recovery Efficiency
摘要
Abstract
In order to explore effective approaches to enhance oil recovery in the late stage of water-flooded develop-ment in reservoirs with medium-low permeability and high-ultra-high water content,this study,taking Nanhu Oil-field as an example,deepens the understanding of reservoir microscopic characteristics through mineral analysis and SEM methods,and investigates the feasibility and application effects of dispersed particle gel in improving oil recov-ery using the combination of nuclear magnetic resonance and mercury injection methods.The results show that Nan-hu Oilfield is featured with well-developed large pore channels,obvious speed sensitivity and water sensitivity.Se-vere water breakthrough is the main reason for inefficient development,while key factors for improving development effectiveness include low-rate water injection,maintaining reservoir energy,and controlling water channeling.The dispersed particle gel can effectively inhibit water breakthrough and improve the mobilization ability of residual oil in medium and small pores.The oil recovery ratio in small pores of the core samples,in medium pores increased by 52.83 percentage points by 34.60 percentage points,respectively,after dispersed particle gel flooding,and the oil recovery increased,and the overall recovery ratio increased by 33.14 percentage points,indicating a significant im-provement in development effectiveness.The findings of this study can provide references for improving the develop-ment effectiveness of reservoirs with high water content.关键词
中低渗/储层微观特征/水窜通道/技术对策/冻胶分散体/南湖油田Key words
medium-low permeability/reservoir microscopic characteristics/water channeling/technical strategies/dispersed particle gel/Nanhu Oilfield分类
能源科技引用本文复制引用
陈洪才,王昭凯,金忠康,王腾,孙永鹏,赵光..中低渗砂岩油藏水驱后期油藏再评价及提高采收率对策[J].特种油气藏,2024,31(4):133-141,9.基金项目
国家级青年人才支持项目"油田化学与提高采收率"(27RA2302015) （27RA2302015）
