摘要
Abstract
Micro-crosslinked thermosensitive polymer poly(acrylamide-co-2-acrylamide-2-methylpropanesulfonic acid-co-N-vinyl-epsilon-caprolactam(PAANVCL)was prepared by free radical polymerization using 2-acrylamido-2-methylpropane sulfonic acid,acrylamide,and N-vinylcaprolactam as monomers and N,N'-methylenebisacrylamide as the crosslinking agent.The morphological characteristics of PAANVCL were characterized by FTIR,1H NMR,and SEM.The effects of mass concentration,salt amount,and shear rate on the thermosensitive thickening performance of PAANVCL were investigated,and its temperature resistance was evaluated in bentonite-based slurry.The experimental results show that the lower critical solution temperature of PAANVCL aqueous solution is 82℃,which is significantly higher than that of poly(N-vinylcaprolactam)(32℃).With the increase of mass concentration,the micro-crosslinked structure between PAANVCL molecular chains and the intermolecular hydrophobic association are enhanced,and the tackifying performance of the polymer is improved.With the increase of temperature,the PAANVCL molecular chains change from hydrophilic to hydrophobic,the solution transparency decreases,and the viscosity shows a trend of first decreasing and then increasing.PAANVCL aqueous solution can maintain good thermosensitive tackifying performance in the range of 70-100℃under high salinity conditions and at different shear rates.The viscosity retention rate of the drilling fluid base slurry containing PAANVCL after aging at 160℃for 16 h is as high as 83.3%,which is significantly better than that of PAAMPS.关键词
微交联/温敏聚合物/增黏提切剂/耐温抗盐/抗剪切Key words
micro-crosslinking/thermosensitive polymer/tackifying and shear strength-improving agent/temperature and salt resistance/shear resistance分类
化学工程
