一种油田压裂用耐高温聚合物增稠剂 PAS-1研制

Development of High-temperature Polymer Thickening Agent PAS-1 for Oilfield Fracturing Fluid

陈效领 李帅帅 苏盈豪 胡儒丽 唐菲利

CHEN Xiaoling LI Shuaishuai SU Yinghao HU Ruli TANG Feili

为配制热稳定性优良的压裂液， 以丙烯酰胺、 丙烯酸为骨架单体， 磺酸基单体、 阳离子单体、 亲水长链单体为功能单体合成了一种可以用于地层温度在 200℃以上的压裂液增稠剂 PAS-1。通过研究单体比例及其他反应条件对增稠剂性能的影响确定了 PAS-1最佳合成条件， 通过红外光谱和核磁共振氢谱表征了其分子结构， 并评价了其作为压裂液增稠剂 PAS-1的主要性能。研究结果表明： 增稠剂 PAS-1的最佳合成条件为： 单体 AM、 AA、PSN、 APEG、 DMDAAC 摩尔比 4.5∶2.5∶0.80∶0.0040∶0.18， 引发剂过硫酸铵用量为单体总质量 0.8%， 引发温度40℃下反应 30 min 后在 60℃下保温反应 24 h。增稠剂 PAS-1高分子本身在 300℃以内具有较好的热稳定性， 增稠剂 PAS-1还具有较强的增黏能力， 质量分数 0.6%的 PAS-1溶液黏度达 43.7 mPa·s。1.0%增稠剂 PAS-1基液中加入 0.6%有机钛锆复合交联剂 SJ66， 支撑剂沉降速率为 0.095 mm/min， 表明合成的增稠剂配制的压裂液交联体系具有优良的悬砂性能。1%增稠剂 PAS-1+0.6%有机钛锆复合交联剂 SJ66的压裂液具有较好的耐温抗剪切能力， 在温度 200℃、 剪切速率 170 s-1下剪切 2 h后的压裂液黏度保留值在 50 mPa· s以上， 可满足高温压裂液的施工性能要求。图8表6参12

In order to prepare the fracturing fluid with good heat resistance， a acrylamide copolymer thickening agent PAS-1 was prepared using acrylamide and acrylic acid as backbone monomers and sulfonic acid group monomer、 cationic monomer and long hydrophilic chain monomer as functional monomers. The best synthesis conditions were optimized by investigating the effect of the monomer proportioning and reactive conditions on its performance. The structure of the copolymer was characterized and the major performance of the formed fracturing fluid was evaluated. The optimization of experimental conditions was concluded as follows: the mole ratio of AM， AA， PSN， AP and DMDAAC was 4.5∶2.5∶0.80∶0.0040∶0.18；the initiator ammonium persulfate（APS） concentration was 0.8%；and the reaction was initiated at the temperature of 40℃ for 30 min and continued at the temperature of 60℃ for 24 h. The thickening agent PAS-1 had xcellent thermal stability at the high temperature within 300℃. The thickening agent PAS-1 had strong ability of increasing viscosity， and the viscosity of the PAS-1 solutions was up to be 43.7 mPa·s at the mass fraction of 0.6%. the sedimentation velocity of the proppants was 0.095 mm/min when the proppants was placed into the fracturing fluid containing 1% PAS-1 and 0.6% cross-linking agent SJ66， indicating that the fracturing fluid prepared by thickening agent PAS-1 had excellent sand-carrying ability. The final viscosity of the formed fracturing fluid system was above 50 mPa·s after continuously shearing for 120 min at the speed of 170 s-1 and at the temperature of 200℃ ， possessing a good performance of temperature tolerance and shearing resistance. Therefore， the thickening agent PAS-1 could meet the performance requirements of high temperature fracturing fluid.

10.19346/j.cnki.1000-4092.2016.06.008