高稳定性超临界CO2泡沫封窜体系构建及性能研究
DOI:
作者:
作者单位:

中国石油化工股份公司胜利油田分公司勘探开发研究院

作者简介:

通讯作者:

中图分类号:

基金项目:

中国石化气驱提高采收率重点实验室课题“高稳定性N2泡沫调驱体系提高采收率机理研究(KL22008)”、胜利油田分公司博士后课题(YKB2210)资助。


Construction and performance of high stability supercritical CO2 Foam for channeling blocking during CO2 flooding
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    胜利油田低渗透油藏埋藏深、温度高,针对CO2驱波及效率低、常规泡沫调驱性能变差等问题,构建了由两性表面活性剂HSD和改性SiO2纳米颗粒组成的高稳定性超临界CO2泡沫体系。该体系表现出了很好的耐高温特性,120℃条件下浓度0.5%的纳米颗粒使泡沫析液半衰期由17min提高到了40min,稳定性提高了近2.5倍。基于幂律模型研究了纳米颗粒对超临界CO2泡沫体系流变特性的影响,结果表明相同剪切速率条件下体系表观粘度随纳米颗粒浓度增加而增加,稠度系数由0.073增加至1.22。通过岩心驱替实验模拟了多孔介质中超临界CO2泡沫表观粘度的变化规律,泡沫在多孔介质中的稳态表观粘度随纳米颗粒增加而增加,超临界CO2泡沫泡沫呈“颗粒状”堆叠排放,泡沫尺寸大约在10~20um。最后通过实验证实纳米颗粒增强CO2泡沫稳定性机理,表面活性剂分子的吸附使亲水性纳米二氧化硅具有了界面活性,从水溶液中吸附到气液界面上,从而提高了泡沫稳定性。

    Abstract:

    Aiming at the problems of low sweep efficiency of CO2 flooding and poor performance of conventional foam profile control ability, a high stability supercritical CO2 foam system composed of amphoteric surfactant HSD and modified SiO2 nanoparticles is constructed. Low permeability reservoirs in Shengli Oilfield are buried deep and have high temperature.The system showed good high-temperature resistance. At 120 ℃, the concentration of 0.5% nanoparticles increased the half-life of foam from 17 minutes to 40 minutes, and the stability was improved by nearly 2.5 times. The increase of reservoir pressure can increase both bubble volume and foam stability. Based on the power law model, the effect of nanoparticles on the rheological properties of supercritical CO2 foam system was studied. The results showed that the apparent viscosity of the system increased with the increase of the concentration of nanoparticles under the same shear rate, and the consistency coefficient increased from 0.073 to 1.22. The change rule of apparent viscosity of supercritical CO2 foam in porous media is simulated through core displacement experiment. The steady-state apparent viscosity of foam in porous media increases with the increase of nanoparticles. The foam of supercritical CO2 foam is stacked and discharged in "granular" shape. The size of foam is about 10 ~ 20um. Finally, the mechanism of nano particles enhancing the stability of CO2 foam was confirmed through experiments. The hydrophilic nano silica had interfacial activity due to the adsorption of surfactant molecules, which was adsorbed from aqueous solution to the gas-liquid interface, thus improving the stability of foam.

    参考文献
    相似文献
    引证文献
引用本文
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期: 2023-02-15
  • 最后修改日期: 2023-04-02
  • 录用日期: 2023-04-11
  • 在线发布日期:
  • 出版日期:
点击这里给我发消息

点击这里给我发消息