改性聚合物压裂液的合成及其性能

为了提高油田压裂改造中常用水基压裂液的耐温和耐盐性能,本文以丙烯酸(AA)、丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和季铵盐型长尾疏水单体(DS)为原料,制备了疏水改性聚合物增稠剂(AAAD)。 有机硼酸盐与葡萄糖酸钠形成配合物(GS-2)为交联剂,再加入其它添加剂,AAAD通过交联反应,制备出改性聚合物压裂液。 评价了该体系的流变性、黏弹性、耐温性、抗盐性和破胶性等性能。 结果表明,压裂液在温度150 ℃、剪切速率170 s^-1条件下具有良好的流变性能;在90 ℃,破胶剂过硫酸铵质量分数为0.01%条件下,4 h即可破胶,破胶液黏度为1.6 mPa·s。

Synthesis and Properties of Modified Polymer Fracturing Fluid

In order to improve the temperate and salt tolerance performance of water base fracturing fluid used in fracturing and reconstruction of oil field, acrylic acid(AA), acrylamide(AM), 2-acrylamide-2-methyl propane sulfonic acid(AMPS) and cationic hydrophobic long chain monomer(DS) were used as raw materials to prepare a modified hydrophobic polymer thickener(AAAD). A new fracturing fluid system was prepared using AAAD as the thickening agent, the complex of organic borates and sodium gluconate(GS-2) as the crosslinking agent. The system rheology and viscoelasticity, temperature resistance, salt resistance and gel breaking performance were evaluated. The results show that the fracturing fluid has good rheological properties at 150 ℃ with the shear rate of 170 s^-1. The gel can be broken within 4 h at 90 ℃ and the viscosity of the gel breaking liquid is 1.6 mPa·s when mass fraction of ammonium persulfate is 0.01%.