摘要
以葡萄糖作为碳源,十二烷基羟丙基磺基甜菜碱(DHSB)作为表面修饰剂,通过一步水热法快速合成了稳定的两亲型碳量子点驱油剂(CQDs-S)。采用FTIR、TEM和DLS表征CQDs-S的结构、形貌及分散稳定性,通过界面性能测试、接触角测量、静态洗油实验研究CQDs-S的性能优势,与碳量子点驱油剂CQDs和表面活性剂DHSB对比采收率差异,分析CQDs-S提高采收率的机理。结果表明,CQDs-S是平均粒径为7.8 nm的球状颗粒,其表面修饰烷基而具有两亲性,具有良好的稳定性。质量浓度为0.1%的CQDs-S使油水界面张力降低到0.96 mN/m,使接触角减小到48.5°,静态洗油效率高达86.8%,在渗透率为50×10^(-3)μm^(2)的岩心中使采收率提高16.74%,较CQDs和DHSB有明显提升。CQDs-S能够降低油水界面张力,改变岩石润湿性,实现调堵作用,是一种高效的纳米驱油剂。
A stable amphiphilic carbon quantum dots(CQDs)oil displacement agent(CQDs-S)was rapidly synthesized by one-step hydrothermal method with glucose as carbon source and dodecyl hydroxypropyl sulfobetaine(DHSB)as surface modifier.FTIR,TEM and DLS were used to characterize the structure,morphology and stability of CQDs-S.Interface performance test,contact angle measurement and static oil washing experiment were carried out to study the performance advantages of CQDs-S,compare with DHSB and CQDs in oil recovery,and analyze the mechanism of enhanced oil recovery.The results show that CQDs-S is a spherical particle with an average particle size of 7.8 nm,and its surface is modified with alkyl,which has amphiphilic properties and good stability.With a mass concentration of 0.1%CQDs-S,the oil-water interfacial tension is reduced to 0.96 mN/m,the contact angle is reduced to 48.5°,the static oil washing efficiency is as high as 86.8%,and the oil recovery rate in the core with a permeability of 50×10^(-3)μm^(2)is increased by 16.74%,which is significantly higher than that of CQDs and DHSB.The EOR mechanism of CQDs-S is mainly to reduce interfacial tension,change wettability and realize profile control.CQDs-S is an efficient nano oil displacement agent,which can reduce the oil-water interfacial tension,change the rock wettability,and realize profile control.
作者
黄鹤云
于洪江
李金涛
崔彦琦
雷亮
HUANG Heyun;YU Hongjiang;LI Jintao;CUI Yanqi;LEI Liang(College of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China;Yantai Taihe Xingtong New Meterial Co.,Ltd.,Yantai 264006,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第6期6196-6201,6223,共7页
Journal of Functional Materials
基金
国家自然科学基金项目(22002117)
西安石油大学研究生创新与实践能力培养计划(YCS22211004)。
关键词
水热法
纳米驱油
表面修饰
两亲性
提高采收率
hydrothermal method
nanoflooding
surface modification
amphipathy
EOR
作者简介
通讯作者:于洪江,E-mail:yhjhx@xsyu.edu.cn;黄鹤云(1998—),男,在读硕士,师承于洪江教授,从事碳纳米材料提高采收率研究。
