稠油乳化-剥离双效体系构筑及性能评价
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中国石油大学(华东)石油工程学院

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Construction and Performance Evaluation of Emulsification-Stripping Dual Effect System for Heavy Oil
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School of Petroleum Engineering, China University of Petroleum

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    摘要:

    胜利油田稠油油藏开发存在原油黏度大、流动性差等问题,水驱采收率不理想。因此,以乳化不稳定系数、油膜收缩速率、最小乳化转速为指标,构筑了乳化-剥离双效体系。评价了不同类型表面活性剂对稠油的乳化和剥离能力,优选出0.3wt%CBT/ASC(m(CBT):m(ASC)=3:2)复配体系。通过室内填砂流动实验评价了乳化-剥离双效体系的驱油效果,并利用微观模型研究了其作用机理。结果表明:CBT对稠油具有优异的乳化性能和大幅降低界面张力的作用,ASC对稠油具有良好的剥离能力。复配体系兼具优异的乳化和剥离性能,可提高采收率达14.18%。研究结果对稠油油藏高效开发具有重要指导意义。

    Abstract:

    There are some problems in the development of the heavy oil reservoir in Shengli Oilfield, such as high viscosity and poor fluidity of crude oil, which the recovery efficiency of the water drive is not ideal. Therefore, the emulsification-stripping system was constructed with the instability coefficient of emulsification, the shrinkage rate of oil film and the minimum emulsifying speed as indexes. The emulsification and stripping ability of different surfactants for heavy oil were evaluated. The compound system of 0.3wt%CBT/ASC(m(CBT):m(ASC)=3:2) was optimized. The displacement effect of the emulsification-stripping system was evaluated by the laboratory sand-filling flow experiment. The mechanism of its action was studied by a microcosmic model. The results showed that CBT had excellent emulsification performance and significantly reduced interfacial tension for heavy oil, and ASC had good stripping ability for heavy oil. The compound system has excellent emulsification-stripping function, and the enhanced oil recovery rate can reach 14.18%. The research results have important guiding significance for efficient development of heavy oil reservoir.

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历史
  • 收稿日期: 2021-09-12
  • 最后修改日期: 2023-04-13
  • 录用日期: 2023-04-24
  • 在线发布日期: 2023-06-09
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