压裂用疏水缔合聚合物溶液性质及减阻性能研究

摘要：以一种功能性疏水单体与丙烯酰胺（AM）、丙烯酸（AA）和2-丙烯酰胺-2-甲基丙磺酸（AMPS）为原料，合成了一种疏水缔合聚合物HAWP-18。采用流变仪考察了疏水缔合聚合物HAWP-18的耐剪切性能、黏弹性及触变性，结果表明，HAWP-18属于假塑性流体，临界缔合浓度为2.31g/L，表现出较强的耐剪切性能；黏弹性测试表明，HAWP-18是典型的黏弹性结构流体，具有较宽的线性黏弹区，该体系的储能模量G''大于损耗模量G''，并且黏度越大，弹性特征越强；采用稳态剪切测试研究了不同质量浓度HAWP-18的剪切应力与剪切速率的关系，HAWP-18具有触变性，并且触变性随质量浓度增大而增强；使用自制摩阻测试仪测定了不同质量浓度HAWP-1的减阻性能，结果表明，HAWP-18减阻率随质量浓度的增加先上升后降低。HAWP-18的耐剪切性及其良好的黏弹性、触变性和减阻性能为其应用于压裂液提供了实验支撑。

Study of Solution Properties and Drag Reduction of Hydrophobically Associating Polymer for Fracturing Fluids

Abstract:A hydrophobically associating polymer HAWP-18 was synthesized by using a functional hydrophobic monomer, acrylamide (AM), acrylic acid (AA) and 2-Acrylamido-2-methylpropane sulfonic acid (AMPS) as raw materials. Properties of shearing resistance, viscoelasticity and thixotropy of hydrophobic associating polymer HAWP-18 was investigated by using rheometer. The results show that HAWP-18 solutions were pseudoplastic fluid and exhibited stronger shearing resistance, and the critical associating concentration of HAWP-18 solution was 2.31g/L. According to the viscoelasticity results, HAWP-18 is a typical viscoelastic structure fluid and has a relatively wide linear viscoelastic region. The value of storage modulus (G'') is larger than loss modulus (G''). The higher the viscosity was, the stronger the elastic characteristic of HAWP-18 was. The variation of shear stress with shear rate was also discussed by using steady-state shear test of HAWP-18 with different mass concentrations. It was shown that HAWP-18 had thixotropy property. With the increment of the mass concentration, the thixotropy property enhanced. The drag reduction property of HAWP-18 solutions with different mass concentrations was tested by using homemade friction tester. The drag reduction test showed that the drag reduction rate of HAWP-18 increased at first and decreased latter with the increment of the HAWP-18. The shearing resistance, good viscoelasticity, thixotropy, and drag reduction of HAWP-18 provide experimental support for its application in fracturing fluids.