大庆石油地质与开发2024，Vol.43Issue(6)：71-79,9.DOI:10.19597/J.ISSN.1000-3754.202306024
考虑微观界面力学效应的低矿化度水驱渗流特征模型
A low-salinity water flooding flow characteristics model considering micro interfacial mechanical effect
摘要
Abstract
In order to better describe flow characteristics of low-salinity water flooding,firstly,the potential of low-salinity water flooding to improve oil recovery is verified through core displacement experiment.On this basis,a capillary bundle mathematical model considering micro interfacial interaction between different ion types and miner-als is established to simulate low-salinity water flooding process,and the model is verified by core displacement ex-periment.After successful fitting of relative permeability curve,the model is used to analyze the influence of charac-teristics caliber radius,ion valence and concentration on fluid flow.The results show that,as characteristics caliber radius decreases,the influence of interfacial interaction on recovery of OOIP increases.When characteristics cali-ber radius decreases from 20 μm to 5 μm,the difference in recovery of OOIP increases from 2.9%to 30.5%.When capillary resistance is high,conventional water flooding has limited improving recovery effect,with a large amount of residual oil in the pores.Low salinity water flooding effectively improves oil recovery,and ion valence is the main controlling factor affecting the effectiveness of low-salinity water flooding.Using Na+in low-salinity water flooding in-creases recovery by 7.85 percentage points,while Ca2+increases by 4.83 percentage points.The established capil-lary bundle model can simulate the effect of low-salinity water flooding between different ion types and minerals,providing better theoretical guidance for field development of low-salinity water flooding.关键词
低矿化度水驱/界面作用/驱替实验/毛管束模型/相渗曲线Key words
low-salinity water flooding/interfacial interaction/displacement experiment/capillary bundle model/relative permeability curve分类
能源科技引用本文复制引用
孙德旭,宋云鹏,吴飞鹏..考虑微观界面力学效应的低矿化度水驱渗流特征模型[J].大庆石油地质与开发,2024,43(6):71-79,9.基金项目
国家自然科学基金项目"爆燃压裂中饱和脆性岩石细观损伤机制及其对宏观破坏的控制规律"(51874339) （51874339）
国家自然科学基金项目"低频人工地震波复合泡沫驱协同增效机理研究"(51904320) （51904320）
国家重点研发计划"页岩甲烷原位燃爆压裂储层适应性评价"(2020YFA0711804). （2020YFA0711804）
