Ca-SA/P(AM-AMPS)微球的制备及性能研究

Preparation of Ca-SA/P(AM-AMPS) microsphere and their properties

针对聚丙烯酰胺类调剖剂耐温性能不佳,常温溶胀较快的问题,通过在聚丙烯酰胺P(AM-AMPS)微球表面包覆海藻酸钠(SA)并用Ca2+交联固化制备海藻酸钙/聚丙烯酰胺(Ca-SA/P(AM-AMPS))微球来改善其耐温性能。通过傅里叶变换红外光谱、扫描电镜、透射电镜和纳米粒度及Zeta电位仪对微球的结构、形貌及性能进行了表征。结果表明,在不同SA质量分数下微球平均粒径在47~92 nm之间,当SA质量分数为8%时,Ca-SA/P(AM-AMPS)微球的感温溶胀性能最佳,在20℃下可溶胀2.52倍,较P(AM-AMPS)微球下降42%;在60℃下可溶胀3.35倍,较P(AM-AMPS)微球提高52%。Ca-SA/P(AM-AMPS)微球在常温下溶胀较慢,在高温下快速溶胀且溶胀倍率更大,能够更好地匹配注入调剖工艺,实现高效调剖驱油的作用。

Polyacrylamide profile control agents have the problems of poor temperature resistance and rapid swelling at room temperature.Calcium alginate/Polyacrylamide(Ca-SA/P(AM-AMPS)) microspheres were prepared by cross-linking Ca^(2+) with sodium alginate(SA) on the surface of microspheres to improve their properties.FT-IR,SEM,TEM,Nano Sizer and Zeta-potential Tester were used to analyze the structure,morphology and properties of the microspheres.The results showed that the average particle size of Ca-SA/P(AM-AMPS) microspheres ranged from 47 nm to 92 nm at different SA mass fraction.When the mass fraction of SA was 8%,the swelling property of Ca-SA/P(AM-AMPS) microspheres was the best.The swelling property of Ca-SA/P(AM-AMPS) microspheres was 2.52 times at 20 ℃,which was 42% lower than that of P(AM-AMPS) microspheres.At 60 ℃,the swelling property of Ca-SA/P(AM-AMPS) microspheres was 3.35 times,52% higher than P(AM-AMPS) microspheres.The results show that Ca-SA/P(AM-AMPS) microspheres swell slowly at room temperature,and swell quickly at high temperature with a larger swelling,which can better match the injection profile control process and achieve efficient profile control and oil displacement.