Shear thickening solution is rarely encountered but the solution with low concentration and high salinity is really desired in enhanced oil recovery. In this paper, we developed a comb micro-block hydrophobic association polymer (CBHAP). The polymer solution with high salinity showed an obvious shear thickening behavior, even if the polymer concentration was very low (1 g/L). In addition, with the increase in salinity (> 20 g/L) and temperature, shear thickening phenomenon will be more obvious. We analyzed that the unique rheological behavior was influenced by the comb micro-blocked structure and the forces transition from intramolecular to intermolecular when the curled polymer chains were stretched under shearing. In porous media, high permeability and low flow rate were beneficial to achieve the shear thickening flow. The unique property will endow CBHAP better mobility control ability than conventional polymers, especially in high permeability reservoirs or fractured reservoirs.

中文翻译：

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疏水缔合聚合物的盐诱导剪切增稠行为及其在提高石油采收率方面的潜力

剪切稠化溶液很少遇到，但在提高采收率中确实需要低浓度和高盐度的溶液。在本文中，我们开发了一种梳状微嵌段疏水缔合聚合物（CBHAP）。高盐度聚合物溶液表现出明显的剪切增稠行为，即使聚合物浓度非常低（1 g/L）。此外，随着盐度（> 20 g/L）和温度的升高，剪切增稠现象会更加明显。我们分析了独特的流变行为受到梳状微嵌段结构的影响，并且当卷曲的聚合物链在剪切下拉伸时，力从分子内转变为分子间。在多孔介质中，高渗透率和低流速有利于实现剪切增稠流。