摘要
以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和氢氧化钠(Na OH)为原料,采用过硫酸铵[(NH4)2S2O8]、亚硫酸钠(Na2SO3)和四甲基脲[N(CH3)2CON(CH3)2]作为新型复合引发体系,通过共聚后水解工艺,合成了高分子量三元共聚物(AM-AANa-AMPSNa).考察了引发剂用量、单体浓度、p H和引发温度对共聚物黏均分子量的影响.确定最优条件为:引发剂用量0.035%,单体质量浓度为25%,介质p H 7,引发温度0℃.通过红外光谱和核磁碳谱表征了其结构,并系统评价了其理化性能指标、黏弹性、注入性和驱油性能.结果表明,该共聚物较高分子量部分水解聚丙烯酰胺(HPAM)具有更优异的耐温抗盐性能.其黏均相对分子量达到3000万以上,在胜利油田III型盐水中,浓度1500 mg/L,温度85℃条件下,溶液表观黏度达到17.7 m Pa s,岩心驱油实验在水驱采收率51.8%基础上,可再提高15.8%.上述性能表明,该高分子量三元共聚物有望应用在高温高盐油藏三次采油技术中.
The copolymer（AM-AANa-AMPSNa） was synthesized by solution polymerization of acrylamide（AM）, 2-acrylamide-2-methylpropanesulfonic acid（AMPS） and sodium hydroxide（Na OH） with（NH4）2S2O8, Na2SO3 and N（CH3）2CON（CH3）2 as initiator. The effects of initiator content, monomer concentration, p H and reaction temperature on the viscosity-average molecular weight were investigated, and the optimal conditions were obtained： the initiator content of 0.035%, the monomer concentration of 25%, p H 7, reaction temperature of 0 °C. The structure of copolymer was characterized by IR spectrum and 13 C NMR spectroscopy. In the performance experiments, physicochemical properties, viscoelasticity, injection, oil displacement were evaluated. Results indicated that the copolymer（AM-AANaAMPSNa） demonstrated superior temperature-resistance and salt-resistance compared to higher molecular weight partially hydrolyzed polyacrylamide（HPAM）. It was found that the viscosity-average molecular weight of the copolymer could reach 3.0 × 107, and the viscosity of the copolymer solution, obtained with Shengli III salt water could reach 17.7 m Pa s at the concentration of 1500 mg/L at 85 °C. The simulative oil displacement signified that copolymers（AM-AANa-AMPSNa） could remarkably enhance 15.8% of oil recovery ratio, especially after water flooding at the oil recovery ratio of 51.8%. These features indicated that the copolymers had a great potential application for tertiary oil recovery, especially in high-temperature and high-mineralization oil fields.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2014年第11期1762-1770,共9页
SCIENTIA SINICA Chimica
基金
中国石油化工股份有限公司技术开发项目(209001)资助
关键词
三次采油
聚合物驱油
耐温抗盐
黏弹性
聚丙烯酰胺
tertiary oil recovery
polymerflooding
temperature-tolerated and salt-resisted polymers
viscoelasticity
polyacrylamide
