The Effect of Polymer Mixing Time on the Strength of HPAM-Cr(III) Gels

IF 0.5 Q4 CHEMISTRY, MULTIDISCIPLINARY
I. Gussenov
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引用次数: 0

Abstract

The dissolution of hydrolyzed polyacrylamide, commonly used in gel treatments for enhanced oil recovery, takes between 2‒3 to over 24 h at 20‒25 °C. The duration is influenced by factors such as polymer molecular weight and brine salinity. In injection/production wells, gel treatments often involve injecting 50‒150 m3 of polymer solution within 1‒2 days, resulting in the injection of partially dissolved polymer. This raises concerns about the stability and strength of gels containing partially dissolved polymer particles. This study demonstrates that when undissolved polymer particles are kept suspended during the gelation process, there is no significant visual distinction between gels obtained from 30 min or 12 h of polymer mixing. Additionally, viscometer measurements reveal that gels formed with shorter polymer mixing times exhibit higher resistance to shearing. This observation supports the concept that undissolved polymer particles act as a composite material, improving the gel strength. This paper does not advocate for the use of partially dissolved polymer gelants. Undissolved polymer particles cannot effectively penetrate porous media. Gelants containing such particles are primarily suited for addressing fracture conformance issues. Therefore, future research will focus on examining the impact of polymer mixing time on gel syneresis and resistance to washout from fractures.
聚合物混合时间对 HPAM-Cr(III) 凝胶强度的影响
水解聚丙烯酰胺通常用于提高石油采收率的凝胶处理中,在 20-25 °C的温度下,其溶解过程需要 2-3 到 24 小时。持续时间受聚合物分子量和盐水盐度等因素的影响。在注水井/生产井中,凝胶处理通常需要在 1-2 天内注入 50-150 立方米的聚合物溶液,从而导致注入部分溶解的聚合物。这就引起了人们对含有部分溶解聚合物颗粒的凝胶稳定性和强度的担忧。本研究表明,当未溶解的聚合物颗粒在凝胶化过程中保持悬浮状态时,混合聚合物 30 分钟或 12 小时后得到的凝胶在视觉上没有明显区别。此外,粘度计测量结果表明,聚合物混合时间较短形成的凝胶具有较高的抗剪切性。这一观察结果支持了未溶解聚合物颗粒作为复合材料提高凝胶强度的概念。本文不主张使用部分溶解的聚合物凝胶剂。未溶解的聚合物颗粒无法有效渗透多孔介质。含有此类颗粒的凝胶剂主要用于解决断裂一致性问题。因此,未来的研究将侧重于研究聚合物混合时间对凝胶滞后性和抗裂缝冲刷性的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Eurasian Chemico-Technological Journal
Eurasian Chemico-Technological Journal CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
1.10
自引率
20.00%
发文量
6
审稿时长
20 weeks
期刊介绍: The journal is designed for publication of experimental and theoretical investigation results in the field of chemistry and chemical technology. Among priority fields that emphasized by chemical science are as follows: advanced materials and chemical technologies, current issues of organic synthesis and chemistry of natural compounds, physical chemistry, chemical physics, electro-photo-radiative-plasma chemistry, colloids, nanotechnologies, catalysis and surface-active materials, polymers, biochemistry.
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