阳离子协同表面活性剂提高采收率可视化实验研究
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西安石油大学

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TE357

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国家自然科学基金面上项目(52174028),国家自然科学基金重点项目(51934005),陕西省创新能力支撑计划(2023KJXX-051)


Visualization Investigation of Enhanced Oil Recovery by the Synergy of Cations and Surfactants
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1.Xi'2.'3.an Shiyou University

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    摘要:

    通过改变注入水矿化度和离子组成提高石油采收率已经成为许多研究的焦点。然而,针对表面活性剂和注入水水质相结合的提高采收率技术相对较少。因此本文通过微模型模拟驱替过程进行微观驱油实验,结合油水间界面张力和粘弹性模量测定实验研究不同阳离子和表面活性剂协同作用对采收率的影响。微观驱油实验结果表明:10000ppm NaCl溶液和50000ppm CaCl2溶液的驱油效率最好,采收率分别达到64.51%和59.27%;加入表面活性剂后,10000ppm NaCl+0.2%十二烷基二甲基甜菜碱溶液和50000ppm CaCl2+0.2%十六烷基三甲基溴化铵溶液驱油效率最好,采收率分别达到了87.28%和80.92%。界面张力和粘弹性模量测定实验结果表明:NaCl溶液和CaCl2溶液加入阴离子与非离子表面活性剂后,界面张力在10-1mN/m数量级,而加入两性离子和阳离子表面活性剂后,界面张力下降至10-2~10-3mN/m数量级,粘弹性模量也出现大幅度下降。最终从从油水界面张力、粘弹性模量以及润湿性以及微观驱油过程综合探讨不同阳离子协同表面活性剂对驱油过程的影响机理,综合分析多因素与采收率之间的关系。

    Abstract:

    The enhancement of oil recovery by altering the salinity and ion composition of injected water has become a focal point of numerous studies. However, there is relatively less attention given to techniques combining surfactants with the quality injected water. To investigate the synergistic effects of different cations and surfactants on recovery efficiency, micro-scale displacement experiments were conducted to simulate the displacement process, along with experiments measuring interfacial tension and viscoelasticity modulus at the oil-water interface. Results from the micro-scale displacement experiments showed that 10,000 mg/L NaCl solution and 50,000 mg/L CaCl2 solution exhibited the best oil recovery efficiencies, reaching 64.51% and 59.27% respectively. After adding surfactants, the efficiency improved further with 10,000 mg/L NaCl + 0.2% dodecyl dimethyl ammonium betaine solution and 50,000 mg/L CaCl2 + 0.2% hexadecyl trimethyl ammonium bromide solution achieving the highest recovery rates at 87.28% and 80.92% respectively. Results from the interfacial tension and viscoelasticity modulus experiments indicated that when anionic and nonionic surfactants were added to NaCl and CaCl2 solutions, the interfacial tension reached the magnitude of 10-1 mN/m. However, with the addition of amphoteric and cationic surfactants, the interfacial tension decreased to the magnitude of 10-2~10-3 mN/m, accompanied by a significant decrease in viscoelasticity modulus. This study explores the mechanisms of the synergistic effects of different cations and surfactants on the displacement process, considering factors such as interfacial tension, viscoelasticity modulus, and wettability, and microscale oil displacement behaviors thus providing a comprehensive analysis of the relationship between multiple factors and recovery efficiency.

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何芬,刘娅菲,房文静,等. 阳离子协同表面活性剂提高采收率可视化实验研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-08
  • 最后修改日期:2024-05-09
  • 录用日期:2024-05-22
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