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首页> 外文期刊>Journal of Applied Polymer Science >Controllable preparation, rheology, and plugging property of micron-grade polyacrylamide microspheres as a novel profile control and flooding agent
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Controllable preparation, rheology, and plugging property of micron-grade polyacrylamide microspheres as a novel profile control and flooding agent

机译：微米级聚丙烯酰胺微球作为新型调剖剂和驱油剂的可控制备，流变学和封堵性能

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A series of micron-grade polyacrylamide microspheres were prepared by inverse suspension polymerization of acrylamide (AM) and N,N′-methylene bisacrylamide (MBA) in oil phase, with Span80 and Tween80 as dispersion stabilizers, and ammonium persulfate (APS) as an initiator. The conversion rate and coagulum rate were introduced to optimize the inverse suspension polymerization conditions of micron-grade polyacrylamide microspheres. The swelling property of polyacrylamide microspheres in aqueous solution and the rheology of polyacrylamide microspheres suspension were characterized. The matching factor was introduced to characterize the matching relationship between the particle size of polyacrylamide microspheres and pore-throat size of reservoirs. The optimized synthesis results show that the conversion rate is high, and the coagulum rate is low when the mass ratio of Span80 to Tween80 is 3: 1. The particle size of the polyacrylamide microspheres is controlled by varying the concentration of dispersion stabilizer. The polyacrylamide microspheres show an obvious swelling property, which depends on the concentration of NaCl and temperature. The polyacrylamide microspheres suspension shows different rheological properties at different temperature and shear rate. When the temperature is low, it behaves as pseudoplastic fluid, dilatant fluid and quasi-newtonian fluid in turn with the increase of shear rate. When the temperature is high, it behaves as dilatant fluid and quasi-newtonian fluid in turn with the increase of shear rate. The micron-grade polyacrylamide microspheres prefer to plug sand pack with optimal matching factor. When the matching factor is 1.35-1.55, the polyacrylamide microspheres can be transported into the deep area of sand pack, and the ultimate plugging rate is more than 85%, which indicates that the matching factor is an effective parameter to evaluate the matching relationship between polyacrylamide microspheres and reservoirs.
机译：以Span80和Tween80为分散稳定剂，过硫酸铵（APS）为原料，通过丙烯酰胺（AM）和N，N'-亚甲基双丙烯酰胺（MBA）在油相中反相悬浮聚合制备了一系列微米级聚丙烯酰胺微球。启动器。引入转化率和凝结速率以优化微米级聚丙烯酰胺微球的反相悬浮聚合条件。表征了聚丙烯酰胺微球在水溶液中的溶胀性能和聚丙烯酰胺微球悬浮液的流变性。引入匹配因子来表征聚丙烯酰胺微球粒径与储层孔喉尺寸的匹配关系。优化的合成结果表明，当Span80与Tween80的质量比为3：1时，转化率高，凝结率低。通过改变分散稳定剂的浓度可以控制聚丙烯酰胺微球的粒径。聚丙烯酰胺微球显示出明显的溶胀性，这取决于NaCl的浓度和温度。聚丙烯酰胺微球悬浮液在不同的温度和剪切速率下表现出不同的流变性。当温度较低时，随着剪切速率的增加，其又依次表现为假塑性流体，膨胀流体和准牛顿流体。当温度高时，随着剪切速率的增加，它又表现为膨胀流体和准牛顿流体。微米级聚丙烯酰胺微球更喜欢以最佳匹配系数塞入砂土。当匹配因子为1.35-1.55时，聚丙烯酰胺微球可以被运入沙堆的深部区域，最终堵塞率为85％以上，表明该匹配因子是评价两者之间匹配关系的有效参数。聚丙烯酰胺微球和储层。

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