摘要
低渗透油藏开采中表面活性剂在岩石和油/水界面的吸附对岩石表面和油/水界面性质的影响,是低渗透油藏渗吸增强驱油技术的关键问题。本文运用分子动力学模拟方法研究了十八烷基二甲基羟丙基磺基甜菜碱(OHSB)、聚氧乙烯辛基苯酚醚-10(OP-10)、阳离子双子表面活性剂(12-4-12)、十二烷基苯磺酸钠(SDBS)和鼠李糖脂(RH-2DA)5种表面活性剂在石英(101)面和油/水界面的吸附行为。研究结果表明:12-4-12双子阳离子表面活性剂与带负电荷的石英表面之间的静电吸引作用最强,SDBS与石英表面之间的静电排斥作用最强,12-4-12和RH-2DA能够自发吸附在石英表面并降低石英表面的润湿性;5种表面活性剂在石英表面吸附能数值由小至大的顺序为12-4-12<RH-2DA<OHSB<OP-10<SDBS;5种表面活性剂均能自发吸附到油相表面,在油相表面吸附强弱的大小顺序为OP-10>RH-2DA>OHSB>12-4-12>SDBS;5种表面活性剂在油/水界面的吸附均能增强油水界面的稳定性。
The adsorption behavior of surfactants on the rock and oil/water interface and its influence on the properties of the rock surface and the oil/water interface are the key issues in producing low permeability reservoirs of imbibition enhanced oil displacement technology in low permeability reservoirs.In this paper,molecular dynamics simulation methods are used to study the octadecyl dimethyl hydroxypropyl sultaine(OHSB),polyoxyethylene octyl phenol ether-10(OP-10),Gemini surfactant(12-4-12),sodium dodecylbenzene sulfonate(SDBS),and rhamnolipid(RH-2DA),five types of surfactants adsorption behavior of on the quartz(101)surface and the oil/water interface.The study results show that among the five surfactants,the electrostatic attraction between the Gemini surfactant12-4-12 and the negatively charged quartz surface is the strongest,and the electrostatic repulsion between the SDBS and the quartz surface is the strongest.12-4-12 and RH-2DA can spontaneously adsorb on the quartz surface and reduce the wettability of the quartz surface.The adsorption energy of five surfactants on the quartz surface from small to large is 12-4-12<RH-2DA<OHSB<OP-10<SDBS.All five surfactants can be adsorbed on the surface of the oil phase spontaneously,and the order of adsorption strength on the surface of the oil phase is OP-10>RH-2DA>OHSB>12-4-12>SDBS.The adsorption of the five surfactants at the oil/water interface can all enhance the oil/water interface's stability.
作者
李侠清
张星
王增敏
冯震
吕超
沈岩柏
韩聪
LI Xiaqing;ZHANG Xing;WANG Zengmin;FENG Zhen;LV Chao;SHEN Yanbai;HAN Cong(Petroleum Engineering Technology Research Institute, Sinopec Shengli Oilfield Company, Dongying 257000, Shandong;School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning)
出处
《矿产保护与利用》
2021年第2期44-51,共8页
Conservation and Utilization of Mineral Resources
基金
“十三五”国家重大专项(2017ZX05072)
国家自然科学基金项目(51874073)
中国石油化工股份有限公司基础前瞻项目“低渗透砂岩油藏渗吸采油技术”
中国石油化工股份有限公司攻关项目“压驱开发工艺技术研究”
中央高校基本科研业务费项目(N2001008)。
