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.
出处
《东北石油大学学报》
CAS
北大核心
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)
