摘要
针对水驱采收率低且经济上不适合热采的稠油油藏,以具有良好稠油降黏作用的混合芳烃为溶剂,通过纳米膨润土和烷基酚聚氧乙烯醚非离子表面活性剂协同作用构建混合芳烃乳化溶剂驱油体系。结果表明:纳米膨润土和烷基酚聚氧乙烯醚可以稳定乳化溶剂时间超过30 d,其协同机制是烷基酚聚氧乙烯醚通过氢键作用吸附在纳米膨润土颗粒表面实现部分疏水改性,促使其牢固吸附在油水界面提高界面膜的刚性强度,从而大幅度提高乳化溶剂体系稳定性;纳米膨润土吸附非离子表面活性剂后发生弱聚集作用,在连续水相中形成密集三维网状结构,提高乳化溶剂体系的体相黏度和界面黏弹性,增强乳化溶剂体系的流度控制能力;纳米膨润土强化乳化溶剂可以提高水驱稠油采收率超过25%,其主要机制是纳米膨润土增强了乳化溶剂的稳定性和流度控制能力,同时依靠乳化溶剂优异的混溶降黏作用,显著提高了稠油的流动能力,从而提高水驱稠油采收率。
Due to the heavy oil reservoirs with low waterflooded recovery and economically unsuitable for thermal recovery,the mixed aromatic hydrocarbons with good viscosity reduction effect was used as solvents,and the mixed aromatics solvent emulsion flooding system was constructed by the synergistic effect of nano-bentonite and alkylphenol polyoxyethylene ether nonionic surfactant.The results show that the solvent emulsion prepared by nano-bentonite and alkylphenol polyoxyethylene ether can be stabilized for more than 30 days.The synergistic mechanism is that alkylphenol polyoxyethylene ether adsorbs on the surface of nano-bentonite particles through hydrogen bonding to realize partial hydrophobic modification,which promotes its firm adsorption on the oil-water interface to improve the rigidity of the interfacial film,thus greatly improving the stability of solvent emulsion.Besides,the weak aggregation of nano-bentonite after adsorption of nonionic surfactant can form a dense three-dimensional network structure in continuous aqueous phase,which greatly improves the bulk viscosity and interfacial viscoelasticity of solvent emulsion system,and thus enhancing the mobility control ability of solvent emulsion system.Nano-bentonite enhanced solvent emulsion can improve the recovery of heavy oil by more than 25%.The main oil displacement mechanism is that nano-bentonite strengthens the stability and mobility control of solvent emulsion,and the solvent emulsion can significantly improve the flow ability of heavy oil by virtue of the excellent viscosity reduction,thus greatly improving the recovery of heavy oil by water flooding.
作者
裴海华
赵建伟
张贵才
张菅
单景玲
蒋平
PEI Haihua;ZHAO Jianwei;ZHANG Guicai;ZHANG Jian;SHAN Jingling;JIANG Ping(State Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)),Qingdao 266580,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第6期149-157,共9页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家重点研发计划项目(2018YFA0702400)
山东省自然科学基金项目(ZR2019MEE085)。
关键词
纳米膨润土
非离子表面活性剂
乳化溶剂
协同机制
提高稠油采收率
nano-bentonite
nonionic surfactant
emulsified solvent
synergistic mechanisms
enhance heavy oil recovery
