驱油用水溶性AM-AA-NVP-DAMA四元共聚物的合成及性能

Synthesis and Performance of a Water-Soluble AM-AA-NVP-DAMA Tetra-Copolymer for Enhanced Oil Recovery

摘要:

由1,3-丙二胺和马来酸酐制备的功能单体(DAMA)与丙烯酰胺(AM)、丙烯酸(AA)、N-乙烯基吡咯烷酮(NVP)共聚制备出了一种水溶性AM-AA-NVP-DAMA四元共聚物。共聚反应的条件为：m(AM)∶m(AA)=3∶2，引发剂用量0.5 wt%，反应温度40 ℃，反应时间8 h，pH为7.0。利用红外光谱(IR)、核磁(1H NMR)以及扫描电镜对该共聚物进行了表征。性能研究表明该共聚物在95 ℃下的黏度保留率比部分水解聚丙烯酰胺(HPAM)高16.2 %；在1.8 wt% NaCl条件下的黏度保留率比HPAM高8.7 %；在0.09 wt% CaCl2条件下的黏度保留率比HPAM高9.4 %；经过500 s-1剪切5 min后的黏度保留率比HPAM高16.3 %；60 ℃下0.2 wt%共聚物溶液提高的采收率比HPAM高5.07 %。

Abstract:

A functional monomer (DAMA) was prepared with 1,3-Diaminopropane and maleic anhydride, and then a water-soluble AM-AA-NVP-DAMA tetra-copolymer was polymerized by free radical polymerization using DAMA, N-Vinyl-2-pyrrolidone (NVP), acrylamide (AM), and acrylic acid (AA) as raw materials. The synthesis conditions were as follows: m (AM): m (MA) was 3:2, initiator was 0.5 wt%, temperature was 40 oC, reaction time was 8 h, and pH was 7.0. The AM-AA-NVP-DAMA copolymer was characterized by infrared spectroscopy (IR), 1H NMR, and scanning electron microscope (SEM). It was found that the viscosity retention rate of AM-AA-NVP-DAMA was 16.2 % higher than that of partially hydrolyzed polyacrylamide (HPAM) at 95 oC, the viscosity retention rate of this copolymer in 1.8 wt% NaCl brine was 8.7 % higher than that of HPAM, the viscosity retention rate of this copolymer in 0.09 wt% CaCl2 brine was 9.4 % higher than that of HPAM, and the viscosity retention rate of this copolymer sheared at 500s-1 for 5 min was 16.3 % higher than that of HPAM. It was also found that the enhanced oil recovery (EOR) of 0.2 wt% copolymer solutions was 5.07 % higher than that of HPAM at 60 oC.