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首页> 外文期刊>Journal of Applied Polymer Science >Gelation mechanism and rheological properties of polyacrylamide crosslinking with polyethyleneimine and its plugging performance in air-foam displacement
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Gelation mechanism and rheological properties of polyacrylamide crosslinking with polyethyleneimine and its plugging performance in air-foam displacement

机译：聚乙烯亚胺与聚乙烯交联的聚丙烯酰胺交联的凝胶化机理及流变性能及其在空气泡沫位移中的堵塞性能

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摘要

Gels based on polyacrylamide crosslinking with polyethyleneimine have attracted attention because of their resulting high strength and good thermal stability. This study investigated the gelation mechanism of the polymeric gel and its plugging performance in air-foam flooding. An optic microrheology analyzer was used to monitor the gelation process. The crosslinking reaction occurred in two steps, as determined from the elasticity factor curves, and the polymeric gels adopted a semisolid state from solution, as determined from the solid liquid balance curves. The elastic modulus values were higher than the viscous modulus values, indicating that mature gels were elastic-based materials. The yield stress increased gradually with increasing polymer dosage, which was consistent with the breakthrough pressure and the trend of displacement pressure. The mature gels showed significant thixotropy. In the core displacement test, the preferred injection volume of the gel was 0.1 pore volume, and the stable pressure of the foam flooding was increased by about three times after the core was plugged. The blocking effect for cores with small original permeability was better than that with large permeability. The best blocking resulted from simultaneous treatment of both ends of the cores, followed by front-end treatment and rear-end treatment. (C) 2017 Wiley Periodicals, Inc.
机译：基于聚乙烯亚胺的聚丙烯酰胺交联的凝胶由于它们而引起了高度强度和良好的热稳定性，因此引起了注意力。本研究研究了聚合物凝胶的凝胶化机理及其在空气泡沫泛洪中的堵塞性能。光学微流学分析仪用于监测凝胶化过程。发生在两个步骤中的交联反应，从弹性系数曲线来确定，并且所述聚合物凝胶从溶液通过半固体状态，如从固体液体平衡曲线来确定。弹性模量值高于粘性模量值，表明成熟凝胶是基于弹性的材料。随着聚合物剂量的增加，屈服应力逐渐增加，这与突破压力和排量压力的趋势一致。成熟凝胶显示出显着的触变性。在核心置换试验中，凝胶的优选注射体积为0.1孔体积，堵塞核心后泡沫洪水的稳定压力大约三次。具有小原始渗透性的核心的阻塞效果优于具有大的渗透性的磁芯。最好的阻挡引起了核心两端的同时处理，然后进行前端处理和后端处理。 （c）2017 Wiley期刊，Inc。

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