微悬浮乳液堵调剂性能研究

生产实践证实,常规化学堵调剂对层间渗透率级差大于3的地层不能达到理想的调剖和堵水效果.以油溶性树脂为主剂,并添加乳化剂、稳定剂及其他助剂,经乳化机剪切和乳化后,制备成粒径为1～5 μm且性能稳定的水包油微悬浮乳液堵调剂.通过实验确定了该堵调剂的最佳配方：50％～60％（表示质量浓度,以下同）树脂＋0.35％～0.40％十八烷基三甲基氯化铵或0.35％～0.40％十二烷基苯磺酸钠＋0.1％羟甲基纤维素＋0.10％～0.15％氯化钙＋1％～5％石蜡＋水;同时还确定了针对该堵调剂的破乳配方,即当乳化剂为十八烷基三甲基氯化铵时,破乳剂宜选用质量浓度为2％～3％的氢氧化钠水溶液,当乳化剂为十二烷基苯磺酸钠时,破乳剂宜选用质量浓度为3％～5％的氯化钙水溶液.通过对微悬浮乳液堵调剂的油溶率、酸溶率和粒径等各项指标进行性能测试,结果反映出该堵调剂具有良好的选择性及注入性.岩心驱替实验结果表明,该堵调剂的突破压力梯度达26 MPa/m,堵水率大于97％,耐水冲刷性能优于常规凝胶,并且适用于渗透率级差为7的岩心.

反相微乳液法制备磁性分子印迹聚合物微球

以二氯苯酚为模板分子、丙烯酰胺(AM)为功能单体、三羟甲基丙烷三丙烯酸酯(TRIM)为交联单体、Fe3O4为磁性组分,采用反相微乳液悬浮聚合法制备了磁性分子印迹聚合物微球(MMIPMs)。研究了吸附时间、温度、pH对吸附性能的影响,并考察了其重复利用性。结果表明,温度对二氯苯酚-MMIPMs吸附性能影响不大。底物溶液pH对MMIPMs的吸附性能有一定影响,吸附量随pH的升高而增大,当pH为7.0时,吸附量最大。MMIPMs具有良好的重复利用率。

The Surface Imprinted Polystyrene Beads Prepared via Emulsion Templates

In this paper, the surface imprinted cross-linked polystyrene beads were prepared via suspension polymerization with styrene (St), divinylbezene (DVB), polyvinyl alcohol (PVA1788), the mixture of Span 85 and xylene or the mixture of Span 85 and paraffin as monomer, cross-linking agent, dispersion stabilizer and templates, respectively. The results indicate that there are dense cavities on the surface of beads, and the diameter and density of cavity are related with the composition and amount of emulsion template. The forming mechanism of cavity from thermodynamics and dynamics was proposed.