聚合物微球/表面活性剂复合调驱体系评价及应用
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1.长庆油田分公司油气工艺研究院;2.低渗透油气田勘探开发国家工程实验室;3.西安长庆化工集团有限公司研究所

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国家科技重大专项课题“低渗-超低渗油藏提高储量动用关键工艺技术”(2017ZX05013-005)


Evaluation and application of polymer microsphere / surfactant composite profile control and flooding system
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    摘要:

    针对长庆低渗透油藏特点,提出聚合物微球/表面活性剂复合调驱提高采收率技术。聚合物微球初始粒径一般为50~300nm,具有水化膨胀特性,膨胀倍数5~10倍。扫描电镜可观察到微球水化膨胀过程中的聚集特性,其粒径呈高斯正态分布。表面活性剂最经济的使用浓度为0.3%。聚合物微球加入表面活性剂后混合液粘度增大,微球分散相颗粒屏蔽了表面活性剂的界面活性以及形成胶束的能力,导致界面张力降低幅度变小,不利于表面活性剂驱油。微球质量浓度大于0.4%时封堵率80%以上。聚合物微球与表面活性剂最佳注入方式为体积比1:1的段塞式注入。该体系在安塞油田现场应用效果显著,累计增油3576t,表现出良好的技术适应性。

    Abstract:

    According to the characteristics of Changqing Low Permeability Reservoir, polymer microsphere / surfactant composite profile control and oil recovery technology is proposed. The initial particle size of polymer microspheres is generally 50-300nm, and it has hydration expansion characteristics with expansion ratio of 5-10 times. The aggregation characteristics of microspheres during hydration and expansion were observed by SEM, and the particle size distribution was Gaussian normal distribution. The most economical concentration of surfactant is 0.3%. The results show that the viscosity of the mixture increases after adding surfactant to polymer microspheres, and the dispersed phase particles of microspheres shield the interfacial activity and micelle formation ability of surfactant, which results in the decrease of interfacial tension, which is not conducive to surfactant flooding. When the mass concentration of microspheres is greater than 0.4%, the plugging rate is more than 80%. The best injection mode of polymer microspheres and surfactant is slug injection with volume ratio of 1:1. The application effect of this technology in Ansai Oilfield is good, and the cumulative oil increase is 3576t, showing good technical adaptability.

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  • 收稿日期: 2020-10-20
  • 最后修改日期: 2020-11-16
  • 录用日期: 2020-11-23
  • 在线发布日期: 2022-02-22
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