Abstract In this study, the effect of polymer structure, the degree of hydrolysis, chemical structure of monomer in the backbone, and charge distribution of monomer groups on rheological and filtration properties of Bentonite (Bent)/polymer dispersions were assessed. Two different water-soluble polymers were employed to investigate the rheological and filtration properties of Bent/polymer dispersions. The polymers evaluated are a copolymer of acrylamide and 2-acrylamido-2-methylpropane sulfonic acid (AM-AMPS) (P1) and a terpolymer of acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, and N-Vinylpyrrolidone (AM-AMPS-NVP) (P2). The objective of this work was to study the rheological and filtration properties of Bent/polymer dispersions in deionized and salt water at different temperatures (25 °C and 85 °C). The steady shear rheological data was fitted to Herschel-Bulkley model to compute rheological parameters like yield stress, consistency index, and flow behavior index. The incorporation of polymers in Bent dispersions improved the rheological properties of the Bent dispersions. Addition of electrolyte in Bent/polymer dispersions led to a slight decrease in the rheological properties of all developed dispersions. The Bent/P2 dispersion revealed superior rheological properties compared to the other Bent and Bent/polymer dispersions in both deionized and salt water. TEM analysis of Bent/polymer dispersions was carried out to study the morphology of dispersions. LP/LT and HP/HT filtration experiments were performed in deionized and salt water at 25 °C and 85 °C, respectively, and results showed that Bent/P2 dispersion had minimum filtrate volume and filter cake thickness compared to the Bent dispersion. The permeability of filter cakes was determined using Darcy's law and filter cake morphologies were studied using SEM analysis. The excellent rheological and filtration properties of Bent/P2 dispersion was attributed to the presence of NVP monomer group in P2 polymer, which is stable towards elevated temperatures and high salinity environments. The exceptional filtration and rheological properties of P2 polymer make it a suitable candidate for the development of high-performance drilling fluids.

中文翻译：

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粘土-聚合物系统的流变和过滤性能：聚合物结构的影响

摘要 本研究评估了聚合物结构、水解程度、主链中单体的化学结构和单体基团的电荷分布对膨润土（Bent）/聚合物分散体的流变和过滤性能的影响。使用两种不同的水溶性聚合物来研究弯曲/聚合物分散体的流变和过滤性能。所评估的聚合物是丙烯酰胺和 2-丙烯酰胺-2-甲基丙磺酸 (AM-AMPS) (P1) 的共聚物以及丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸和 N-乙烯基吡咯烷酮 (AM-AMPS) 的三元共聚物-NVP) (P2)。这项工作的目的是研究弯曲/聚合物分散体在不同温度（25 °C 和 85 °C）下在去离子和盐水中的流变和过滤性能。将稳态剪切流变数据拟合到 Herschel-Bulkley 模型中以计算流变参数，如屈服应力、稠度指数和流动行为指数。在 Bent 分散体中加入聚合物改善了 Bent 分散体的流变性能。在弯曲/聚合物分散体中添加电解质导致所有开发的分散体的流变性能略有下降。在去离子和盐水中，与其他弯曲和弯曲/聚合物分散体相比，弯曲/P2 分散体显示出优异的流变特性。进行弯曲/聚合物分散体的 TEM 分析以研究分散体的形态。LP/LT 和 HP/HT 过滤实验分别在 25 °C 和 85 °C 的去离子水和盐水中进行，结果表明，与 Bent 分散体相比，Bent/P2 分散体具有最小的滤液体积和滤饼厚度。使用达西定律确定滤饼的渗透性，并使用SEM分析研究滤饼形态。Bent/P2 分散体优异的流变和过滤性能归因于 P2 聚合物中 NVP 单体基团的存在，该基团在高温和高盐度环境下稳定。P2 聚合物卓越的过滤和流变特性使其成为开发高性能钻井液的合适候选者。Bent/P2 分散体优异的流变和过滤性能归因于 P2 聚合物中 NVP 单体基团的存在，该基团在高温和高盐度环境下稳定。P2 聚合物卓越的过滤和流变特性使其成为开发高性能钻井液的合适候选者。Bent/P2 分散体优异的流变和过滤性能归因于 P2 聚合物中 NVP 单体基团的存在，该基团在高温和高盐度环境下稳定。P2 聚合物卓越的过滤和流变特性使其成为开发高性能钻井液的合适候选者。