Synthesis of a salt-responsive hydrophobically associating polymer for fracturing fluid based on self-assembling transition
Synthesis of a salt-responsive hydrophobically associating polymer for fracturing fluid based on self-assembling transition
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DOI：
10.1016/j.molliq.2022.120201
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发表时间：
2022-09-13
影响因子：
6
通讯作者：
Peng, Rui
中科院分区：
文献类型：
--
作者：
Wang, Quanhang;Mao, Jincheng;Peng, Rui
合成并表征了分子量为1.21 x 10（6）g/mol的盐响应性疏水缔合聚合物（HSRP）。通过对单体的选择和聚合体系的调整，使其具有强缔合、低分子量的特点。由于HSRP分子结构的特殊性，它对盐离子具有很高的灵敏度。通过各种实验测试，进一步拓展和补充了疏水缔合水溶性聚合物的盐增稠效应。在盐水中，HSRP表现出较低的表观粘度和剪切应力。此外，HSRP表现出更好的触变性能和粘弹性行为随着盐度的增加，这归因于自组装转变。从宏观性质和微观机理两个方面研究了盐度对超分子自组装行为和HSRP流变性能的影响。提出了一个合理的盐响应行为的核壳模型：亲水性主链卷曲，形成一个壳，疏水性支链相互关联，形成一个核心。在盐水中，HSRP表现出良好的粘弹性和低摩擦。由于其具有良好的盐敏性能，在三次采油、压裂等方面具有广阔的应用前景。(c)2022爱思唯尔有限公司版权所有。
A salt-responsive hydrophobically associating polymer (HSRP) with a molecular weight of 1.21 x 10(6) g/mol was synthesized and characterized. It has the characteristics of strong association and low molecular weight by choosing monomers and adjusting the polymerization system. HSRP exhibited a high sensitivity to salt ions owing to the peculiarities of its molecular structure. Through various experimental tests, this study further expanded and complemented the salt-thickening effect of hydrophobic association water-soluble polymers. In brine, HSRP exhibited low apparent viscosity and shear stress. In addition, HSRP demonstrated better thixotropic properties and viscoelastic behavior as the salinity increased, which was attributed to a self-assembling transition. The effect of salinity on self-assembling behavior of supermolecules and rheological properties of HSRP was examined through macroscopic properties and microscopic mechanisms. A reasonable core-shell model was proposed for the salt-responsive behavior: The hydrophilic backbones curled up, forming a shell, and the hydrophobic branched chains interassociated to form a core. In brine, HSRP displayed excellent viscoelasticity and low friction. It is expected to find wide applications in tertiary recovery and fracturing in saline reservoirs based on its excellent salt-responsive properties.(c) 2022 Elsevier B.V. All rights reserved.