纳米聚合物微球/表面活性剂复合调驱体系评价及应用
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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”(项目编号2017ZX05013-005)


Evaluation and Application of Polymer Microsphere and Surfactant Compound 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。以丙烯酸、2-丙烯酰 胺-2-甲基丙磺酸、2-巯基苯甲酸、过硫酸铵、亚硫酸氢钠等为原料制备聚合物微球,以烷醇酰胺聚氧乙烯聚醚磺 酸盐与椰子油脂肪酸二乙醇酰胺为原料制得表面活性剂。研究了表面活性剂和表面活性剂/聚合物微球混合液 的油水界面张力,考察了聚合物微球与混合液的调驱性能,优选了复合调驱注入方式,并在安塞油田进行了现场 应用。结果表明,聚合物微球初始粒径为50~300 nm,具有水化膨胀特性,膨胀倍数为20~100倍。微球在水化 膨胀过程中产生聚集特性,分散性、球形度均较好,且粒径呈高斯正态分布。表面活性剂适宜用量为3 g/L。聚合 物微球加入表面活性剂后混合液黏度增大,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,导致油水界面张力降幅变小,不利于表面活性剂驱油。聚合物微球溶液对岩心的封堵性较好,微球质量浓度 大于4 g/L时的封堵率约80%。体积比为1∶1的聚合物微球与表面活性剂段塞式注入岩心的驱油效果好于二者 混合式注入。该体系在安塞油田现场的应用效果显著,累计增油3576 t。

    Abstract:

    According to the characteristics of Changqing low permeability reservoir,polymer microsphere and surfactant compound profile control and oil recovery technology was proposed. Polymer microsphere was prepared by acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid,2-mercaptobenzoic acid,ammonium persulfate and sodium bisulfite. Surfactant complex system was prepared by alkanolamide polyoxyethylene polyether sulfonate and coconut oil fatty acid diethanolamide. The oil-water interfacial tension of surfactant and surfactant/polymer microsphere mixture was studied,the profile control and displacement performance of polymer microsphere and mixture was investigated,and the injection mode of compound flooding was optimized. Finally,it was applied on Ansai oilfield. The results showed that the initial particle size of polymer microsphere was generally 50—300 nm. It had hydration expansion characteristic with expansion ratio of 20—100 times. The aggregation characteristic of microspheres during hydration and expansion was observed by SEM. The microspheres had good dispersion and sphericity,and the particle size distribution was Gaussian normal distribution. The most economical concentration of surfactant was 3 g/L. The viscosity of the mixture increased after adding surfactant to polymer microsphere,and the dispersed phase particle of microsphere shielded the interfacial activity and micelle formation ability of surfactant,which resulted in the decrease of interfacial tension and was not conducive to surfactant flooding. Polymer microsphere solution had good plugging performance to core. When the mass concentration of microsphere was greater than 4 g/L,the plugging rate was about 80%. The oil displacement efficiency of polymer microsphere and surfactant by slug injection mode with volume ratio of 1∶1 was better than that by mixed injection of two systems. The application effect of this technology in Ansai oilfield was good,and the cumulative oil increase was 3576 t.

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  • 在线发布日期: 2022-04-25
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