Wang Zhiyong, Lin Meiqin, Gu Meng, Dong Zhaoxia, Zhang Juan, Yang Zihao
Research Institute of Enhanced Oil Recovery, China University of Petroleum Beijing 102249 China
RSC Adv. 2018 May 30;8(35):19765-19775. doi: 10.1039/c8ra02747a. eCollection 2018 May 25.
In order to obtain polymer microspheres for profile control and water shutoff with high temperature resistance and good swelling properties, micrometer microspheres with a double crosslinked structure were synthesized using the monomers acrylamide (AM), -vinylpyrrolidone (NVP) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS), an initiator of potassium persulfate, a crosslinking agent of ,-methylene bis acrylamide and zirconium acetate. The crosslinked Zr-AM/NVP/AMPS microspheres were fully characterized with several means including FT-IR, C NMR, TG-DSC and SEM. Metal crosslinking was introduced into the polymer microspheres to improve the temperature resistance by crosslinking the hydrolyzed polymer molecular chains. The results of optical microscopy and scanning electron microscopy demonstrated that a double crosslinked structure (DCS) was formed inside the Zr-AM/NVP/AMPS microspheres. It is regrettable that there is no three-dimensional network structure in the microspheres with single organic crosslinked structure (SCS). In aqueous solution, the DCS polymer microspheres were able to maintain long-term thermal stability for 150 days even at a high temperature of 140 °C. The microspheres with SCS can only be preserved for 5 days in high temperature aqueous solution at 140 °C. The TGA-DSC results indicated that the aerobic temperature capability of the DCS microspheres has been greatly improved compared with HPAM and SCS microspheres. The DCS microspheres with ultra-high temperature resistance will have broad application prospects in high temperature reservoirs.
为了获得具有耐高温和良好溶胀性能的调剖堵水聚合物微球，以丙烯酰胺（AM）、N-乙烯基吡咯烷酮（NVP）和2-丙烯酰胺-2-甲基丙磺酸（AMPS）为单体，过硫酸钾为引发剂，N,N'-亚甲基双丙烯酰胺和醋酸锆为交联剂，合成了具有双交联结构的微米级微球。采用傅里叶变换红外光谱（FT-IR）、碳核磁共振（C NMR）、热重-差示扫描量热法（TG-DSC）和扫描电子显微镜（SEM）等多种手段对交联后的Zr-AM/NVP/AMPS微球进行了全面表征。通过使水解的聚合物分子链交联，将金属交联引入聚合物微球中以提高其耐温性。光学显微镜和扫描电子显微镜的结果表明，Zr-AM/NVP/AMPS微球内部形成了双交联结构（DCS）。遗憾的是，具有单一有机交联结构（SCS）的微球中没有三维网络结构。在水溶液中，即使在140℃的高温下，DCS聚合物微球也能够保持150天的长期热稳定性。具有SCS的微球在140℃的高温水溶液中只能保存5天。热重-差示扫描量热法（TGA-DSC）结果表明，与部分水解聚丙烯酰胺（HPAM）和SCS微球相比，DCS微球的好氧温度性能有了很大提高。具有超高耐温性的DCS微球在高温油藏中将具有广阔的应用前景。
