SiO_2纳米颗粒与SDS对CO_2泡沫的协同稳定作用  

Study on the synergistic effect of SiO_2 nanoparticles and SDS on CO_2 foam

作　　者：李兆敏[1] 王鹏[1] 李松岩[1] 孙乾[1] 李杨[1] 姜磊 王继乾 

机构地区：[1]中国石油大学石油工程学院,山东青岛266555 [2]中国石油大学重质油国家重点实验室,山东青岛266580

出　　处：《东北石油大学学报》2014年第3期110-115,12,共6页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(51274228;51304229;U1262102);山东省自然科学基金项目(2012ZRE28014);中央高校基本科研业务费专项资金资助项目(13CX02061A;13CX05018A);中国石油大学(华东)科研启动基金项目(Y1204101)

摘　　要：CO2驱油时,由表面活性剂溶液产生的CO2泡沫稳定性较差,加入纳米颗粒后可与表面活性剂产生协同作用,从而提高CO2泡沫的稳定性.通过泡沫评价实验、界面张力实验和扩张黏弹性模量实验,研究改性SiO2纳米颗粒与表面活性剂十二烷基硫酸钠（SDS）对CO2泡沫的协同稳定作用.结果表明：SiO2纳米颗粒与水的接触角大于79.83°时,能与SDS产生有效协同稳定作用,且协同稳定作用仅在SDS/SiO2混合溶液一定质量浓度比区间范围内存在,当质量浓度比为0.10～0.40时,协同稳定作用随质量浓度比增大,呈现先增强后减弱的规律;当质量浓度比为0.17左右时协同稳定作用最强;当质量浓度比大于0.40时,二者无有效协同稳定作用.SDS与SiO2纳米颗粒对CO2泡沫的协同稳定机理主要包括改善颗粒在界面的吸附位置、减弱歧化作用、改善界面性质及增大体相黏度.研究结果对提高三次采油中CO2驱的采收率具有指导意义.The CO2 foams generated by surfactants solutions are not very stable.Nanoparticles can improve the CO2 foam stability due to the potential synergistic effect of nanoparticles and surfactants.The synergistic effect of SiO2 nanoparticles and SDS on CO2 foams was studied.The research results show that the synergistic effect will not appear until the contact angle between SiO2 nanoparticles and water is higher than 79.83°.And the synergistic effect exits only in a SDS/SiO2mass concentration ratio range,the effect is strengthened firstly and then weakened as the mass concentration ratio rises from 0.10to0.40,achieving its best effect at 0.17.No effective synergistic effect exists when the mass concentration ratio beyond the ratio range.The mechanisms of the synergistic effect include modulating the nanoparticle'absorbing position on the interface,weakening the disproportionation effect,improving the properties of foam film and increasing the bulk viscosity.The study results has a guiding significance to the improvement of the recovery factor of CO2Oil-displacing in the tertiary oil recovery.

关 键 词：CO2泡沫 SiO2纳米颗粒 SDS 质量浓度比 协同稳定作用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]