耐温耐剪切复合微球的合成及性能评价

Preparation and performance evaluation of anti-temperature and anti-shearing compound microspheres

聚丙烯酰胺微球是一种改善油藏非均质性的调剖剂,而常规聚丙烯酰胺微球耐温性、耐剪切性差,限制了微球适用范围。以丙烯酰胺为单体,Span80、Tween80为乳化剂,酚醛树脂为交联剂,在其他条件相同的条件下,采用单次引发法和二次引发法两种合成方案,通过反相悬浮法制备了两种AM/PF复合微球。结果表明,二次合成法AM/PF复合微球优于单次合成法的微球性能。二次合成法合成的AM/PF复合微球在140℃下能够稳定存在120 d,溶胀比率为4.93;在剪切速率为10000 r/min下剪切12 min,粒径下降率为7.69%。

Polyacrylamide microsphere is a kind of profile control agent to improve the heterogeneity of oil reservoir,however the conventional polyacrylamide microspheres have poor temperature resistance and shear resistance,which limited its application range.Two kinds of AM/PF composite microspheres have been synthesized with acrylamide as monomer,single sorbitan oleate(Span80)and polyoxyethylene sorbitan monostearate(Tween80)as the emulsifier,phenolic resin as the crosslinking agent,under the same conditions,by a single initiator method and quadratic initiator method,prepared by inverse suspension method.The results show that the performance of AM/PF compound microspheres is better than that of single composite microspheres.The AM/PF composite microspheres prepared by the secondary synthesis method can be stable for 120 d at 140℃ with a swelling ratio of 4.93.At the shear rate of 10000 r/min for 12 min,the particle size decrease rate was 7.69%.