摘要
综合利用全能红外稳定分析仪、光学显微镜及多功能流变仪,从宏观和微观角度开展了不同复合体系在岩心渗流和机械搅拌下生成乳状液的稳定性、黏度及微观形态变化特征实验研究。在此基础上,辅以岩心驱油实验,研究了不同乳状液复合体系的驱油效果。结果表明,甜菜碱表面活性剂二元体系可在岩心多孔介质驱油过程中有效生成乳状液,机械搅拌状态下不同复合体系稳定性差异显著。二元、无碱A、三元体系的机械搅拌剪切与岩心渗流生成乳状液的TSI值具有反向关联的关系,而在乳状液黏度上二者具有正向关联的关系。相比于岩心剪切,机械搅拌剪切应力较大,不同体系生成的乳状液液滴粒径更小,能够更显著地区分出不同体系之间乳状液相态区别。岩心驱油实验过程中,整体渗流阻力与提高采收率幅度存在反向相关的关系,不同等黏度体系提高采收率幅度依次升高,且具有显著的梯度差异,二元、三元、无碱A体系不仅可以通过乳化封堵起到调剖作用,扩大波及体积,进而提高洗油效率,乳化流体还可以进入水驱难以波及的微孔区域中洗油、刮油,通过乳化携带作用,降低残余油饱和度,改善驱油效果。
The stability,viscosity,and micro-morphological changes of emulsions formed by different composite systems under core seepage and mechanical stirring were studied from macro and micro perspectives by using a universal infrared stability analyzer,optical microscope,and multifunctional rheometer.On this basis,the oil displacement effect of different emulsion composite systems was studied by core flooding experiments.The results show that the binary system of betaine surfactant can effectively generate emulsion in the process of core porous media flooding,and the stability of different composite systems under mechanical stirring is significantly different.The mechanical stirring shear of binary,alkali-free A,and ternary systems have an inverse correlation with the TSI value of the emulsion formed by core seepage,while the two methods have a positive correlation in the viscosity of the emulsion.Compared with core shearing,the shear stress of mechanical stirring is larger,and the particle size of emulsion droplets generated by different systems is smaller,which can more significantly distinguish the difference in emulsion phase state between different systems.In the process of the core flooding experiment,there is an inverse correlation between the overall seepage resistance and the enhanced oil recovery(EOR).The magnitude of enhanced oil recovery in different systems increases in turn and has significant gradient differences.The binary,ternary,and alkali-free A system can not only play a profile control role through emulsification and plugging but also expand the swept volume and improve the efficiency of oil washing.Notably,emulsified fluid can also enter the micro-pore area that is difficult to be affected by water flooding to wash oil and scrape oil,reduce residual oil saturation through emulsification and carrying,and improve the oil displacement effect.
作者
马良
周朝辉
杜猛
陆舒艺
李根
张群
韩璐
刘先贵
MA Liang;ZHOU Zhao-hui;DU Meng;LU Shu-yi;LI Gen;ZHANG Qun;HAN Lu;LIU Xian-gui(School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow&Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;State Key Laboratory of Enhanced Oil&Gas Recovery,Beijing 100083,China;School of Life Sciences Beijing Normal University,Beijing 100875,China;Institute of Unconvention Oil and Gas Research,Northeast Petroleum University,Daqing 163318,China)
出处
《应用化工》
CAS
CSCD
北大核心
2024年第5期1003-1008,1014,共7页
Applied Chemical Industry
基金
国家重大科技专项(2017ZX05013)
中国石油CCUS重大专项(2021ZZ01-03)
中国石油科技重大专项(2022kt1001)。
关键词
乳状液
乳化评价
提高采收率
化学驱
渗流阻力
驱油效果
emulsion
emulsification evaluation
EOR
chemical flooding
seepage resistance
oil displacement effect
