耐盐型疏水缔合聚合物的制备及流变性能

Synthesis and Rheological Properties of An Ultra-high Salt Polymer as Fracturing Fluid System

摘要:

采用丙烯酰胺(AM)、丙烯酸(AA)、2-丙烯酰胺-2-甲基丙烷磺酸(AMPS)和水溶性阴离子疏水单体UUC制备了新型耐盐疏水缔合聚合物UUCPAM。聚合放热测试表明，疏水单体含量的增加导致放热时间的延长，更有利于疏水结构的形成。微观结构测试表明，聚合物具有复杂的网状结构，在NaCl盐溶液中网状结构更为明显。流变测试结果表明，聚合物在盐溶液中具有良好的耐温和抗剪切性能。聚合物质量分数为0.3 wt%，温度90℃，剪切速率170s-1和20000 mg/L氯化钠条件下，剪切后表观粘度大于80 mPa•s。在20000mg/L模拟地下水条件下，剪切后粘度为70 mPa•s，加入表面活性剂SDS后，粘度增加到170 mPa•s。储能模量G'随着聚合物质量分数的增加而增大，体系弹性增强。同时疏水结构单元数量增加，形成致密的空间网络结构。因此，该聚合物具有良好的耐盐性能和广阔的应用前景。

Abstract:

Herein, a novel ultra-high salt hydrophobic association polymer UUCPAM was produced using acrylamide, acrylic acid, 2-acrylamide-2-methyl propane sulfonic acid, and hydrophobic monomer UUC. The scanning electron microscopy and transmission electron microscopy studies showed that the polymer had complex network structures and this phenomenon was considerably noticeable in NaCl solution. Rheology studies indicated that the polymer had good temperature and shear resistance in NaCl solution. Moreover, the apparent viscosity of the polymer solution remained greater than 80 mPa?s when 0.3 wt% UUCPAM was added at 90?C, shear rate of 170 s?1, and 20000 mg/L NaCl solution. The storage modulus increased with an increase in the polymer concentration, indicating super elasticity. Meanwhile, the number of hydrophobic micro-zones increased, forming dense spatial network structures. Drag reduction performance test showed that when UUCPAM was remained in low concentration, its drug reduction effect was better than that of PAM which demonstrated its good property as fracturing fluid.