四元共聚物压裂液稠化剂的制备与性能评价

Preparation and Performance Evaluation of Tetra-polymer Thickener for Fracturing Fluid

谢艳新 陈可可 苏君慧 王 辉 杨 倩

XIE Yanxin CHEN Keke SU Junhui WANG Hui YANG Qian

为获得耐温性能优良的压裂液，以丙烯酰胺（AM）、丙烯酸（AA）为骨架单体，2-丙烯酰胺基-2-甲基丙磺酸（AMPS）和β-环糊精（β-CD）为功能单体制得四元共聚物压裂液稠化剂（MASD），通过红外光谱仪和核磁共振波谱仪表征了 MASD的结构，评价了 MASD的性能，研究了 MASD和有机锆交联剂组成的压裂液的耐温抗剪切性和对岩心的伤害性。结果表明，在单体总加量 23%、AM∶AA∶AMPS∶β-CD质量比 7∶1∶1∶1、引发剂加量 0.3%（以单体质量计）、溶液 pH值为 7、引发温度在 40℃的条件下反应 0.5 h后再在 60℃下反应 8 h制得的 MASD在 250℃下的化学结构稳定，具有良好的流变性和增黏能力，0.6%的 MASD溶液室温下的黏度为 72 mPa·s，携砂性能较好，陶粒的沉降速率为 1.78×10-4 m/min。0.6% MASD与 0.5%有机锆交联剂组成的压裂液具有良好的耐温抗剪切能力，在 120℃和 140℃、170 s-1下剪切 90 min后的黏度约为 170 mPa·s；对岩心的伤害率低（14.27%），可用于中高温压裂施工。图 7表 8参 16

In order to obtain fracturing fluid with excellent temperature resistance，tetra-polymer thickener MASD for fracturing fluid was prepared using acrylamide（AM）and acrylic acid（AA）as backbone monomers and 2-acrylamide-2-methyl propane sulfonic acid（AMPS）and β-cyclodextrins（β-CD）as functional monomers. The structure of MASD was characterized with FTIR spectrum and 1H-NMR spectrum，and the major performance of MASD was evaluated. Furthermore，the temperature and shearing resistance，core damage property of the fracturing fluid，which was composed of MASD and organic zirconium crosslinking agent，were studied. The results showed that MASD had stable chemical structure at 250℃ ，good rheological property and strong thickening ability，which synthesized on the condition of 23% total concentration of monomers，7∶1∶1∶1 mass ratio of AM∶AA∶AMPS∶β-CD，0.3% initiator dosage in terms of monomers mass，7 pH value，initiating at 40℃ for 0.5 h and then continuing at 60℃ for 8 hrs. The viscosity of 0.6% MASD solution was 72 mPa·s at room temperature. The rate of sand sedimentation was 1.78×10-4m/min，indicating good sand carrying capacity of MASD solution. The fracturing fluid containing 0.6% MASD and 0.5% organic zirconium crosslinking agent had good temperature and shearing resistance. The final viscosity of fracturing fluid system was about 170 mPa·s after continuously shearing for 90 min at 120℃ or 140℃ and 170 s-1. The core damage rate of fracturing fluid was low to 14.27%. The thickener MASD could be used for medium-high temperature fracturing construction.