不同润湿性油藏水驱微界面运移特征研究  

Deformation characteristics of micro-interface of water flooding in different wettability reservoirs

作　　者：史博文 唐洪立 曹修太 钟会影[1] SHI Bowen;TANG Hongli;CAO Xiutai;ZHONG Huiying(Key Laboratory for Enhanced Oil&Gas Recovery of the Ministry of Education,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学提高油气采收率教育部重点实验室,大庆163318

出　　处：《石油科学通报》2025年第2期219-231,共13页Petroleum Science Bulletin

基　　金：国家自然科学基金“考虑移动接触线特性的黏弹性流体驱油两相渗流相间微界面动力学行为研究”(编号:52374032)资助。

摘　　要：为探究水驱过程中不同润湿性条件下油水微界面的运移特征及其演变规律,基于N-S方程建立Hele-Shaw圆柱式模型,采用相场法界面追踪驱替过程中油水微界面的拓扑变形特征,研究润湿性、油水粘度比及毛细管数对油水微界面形变的影响。结果表明,水驱过程中油水微界面的动态演变过程可以分为4个阶段,即突破、分裂、三相接触线交汇及微界面融合。微界面的突破和分裂在驱替周期内重复发生,且不受润湿性和岩石颗粒分布的影响;三相接触线交汇和微界面融合具有相近的形变特征,主要受润湿性和岩石颗粒分布的影响。三相接触线交汇现象主要出现在亲水条件,而微界面融合现象则出现在亲油条件。润湿性由强亲水转变为强亲油时,水驱前缘变化幅度先降低后升高,在弱亲水条件时,呈现“活塞式”驱替模式。模拟发现在弱亲水条件下的驱油效率最高,而强亲油条件下的驱油效率最低(61.06%)。在弱亲水和相同注入孔隙体积倍数条件下,随着油水粘度比从20增加到100时,三相接触线交汇现象的发生率逐渐降低,微观驱油效率降幅为8.56%,且驱替启动压力也随之降低;毛细管数从0.66×10^(-3)增加至2.0×10^(-3)时,三相接触线交汇的发生率增加,模型内的剩余油体积减小,驱油效率提高9.36%。这表明在亲水条件下,增加三相接触线交汇现象的发生率能够显著提高驱油效率。研究结果能够丰富水驱微观渗流机理,为深度挖潜水驱剩余油提供理论依据。In order to investigate the deformation characteristic and transport behavior of oil-water micro-interface and its evolution law under different wettability conditions in water flooding,a Hele-Shaw cylindrical model has been constructed based on the N-S equation.Phase field method has been employed to track the topological deformation characteristics of oil-water micro-interface in water flooding.The effect of wettability,oil-water viscosity ratio,and capillary number on the deformation characteristic and evolution process of oil-water micro-interfaces has been studied.The simulation results show that the dynamic evolution process of oil-water micro-interfaces observed from the model surface in water flooding can be divided into four stag-es,including breakthrough,fracture,three-phase contact line intersection,and micro-interface merging.The breakthrough and fracture phenomenon of oil-water micro-interfaces can be observed repeatedly in the displacement process,and is not affected by wettability and rock particle distribution.Three-phase contact line intersection and micro-interface merging phenomenon have the similar deformation characteristics and evolution law in the vertical profile of the model,which are mainly influenced by wet-tability and rock particle distribution.Three-phase contact line intersection phenomenon occurs more frequently under water-wet condition,while the micro-interface merging phenomenon occurs more frequently under oil-wet condition.The change amplitude of displacement front decreases and then increases in water flooding as wettability changes from strong water-wet to strong oil-wet,which exhibits the piston-like displacement under weak water-wet condition.The simulation results show that the highest oil displacement efficiency is observed under weak water-wet condition,while the lowest oil displacement efficiency(61.06%)is observed under strong oil-wet condition.Moreover,as the oil-water viscosity ratio increases from 20 to 100,the occurrence rate of three-phase contact line intersecti

关 键 词：水驱 微界面运移特征 润湿性 油水粘度比 毛细管数 

分 类 号：TE341[石油与天然气工程—油气田开发工程] TE312