绝热反应合成AM/AMPS共聚物及其性能

Synthesis and Performance of AM/AMPS Copolymer by Adiabatic Reaction

摘要:

选用过硫酸铵(（NH4）2S2O8)和亚硫酸氢钠（NaHSO3）为氧化-还原引发体系，以N , N , N′, N′-四甲基乙二胺（TMEDA）、乙二胺四乙酸二钠（EDTA-2Na）和尿素为助剂，采用水溶液绝热反应合成丙烯酰胺（AM）/2-丙烯酰胺基-2-甲基丙磺酸（AMPS）共聚物，考察了AM与AMPS绝热共聚合的放热过程，并对共聚物的结构和主要性能进行了考察。结果表明，降低引发温度和减小引发剂的用量，有利于聚合物分子链的增长，合成的共聚物溶解性好，相对分子质量达2500万；在95℃、河南油田油藏模拟盐水中，共聚物具有优异的增粘性和耐温抗高盐性能；在动态流变测试中表现出较强的粘弹性。在95℃、采用新鲜污水配制共聚物溶液，60d的黏度保留率达到84.2%，模拟油藏条件进行驱油效果评价，可提高原油采收率达17.38%。

Abstract:

AM/AMPS copolymer was synthesized in aqueous solution using adiabatic reaction. The polymerization was initiated by (NH4)2S2O8-NaHSO3 as the redox initiation system, and TMEDA, urea and EDTA-2Na were added at the same time. The exothermic process of adiabatic polymerization, the structure and the properties of copolymer were investigated. The results showed that the molecular weight of copolymer could reach 2.5×107 by falling initiation temperature and reducing initiator concentration, and the solubility of copolymer was perfect. In addition, the copolymer solution had significant capacities of increasing viscosity, excellent heat resistance and salt tolerance, and strong viscoelasticity at high temperature. The viscosity retention rate of copolymer solution was as higher as 84.2%, under the condition of fresh brine, 95℃ and a 60-day aging test. The polymer flooding could enhance oil recovery by 17.38% according to simulation displacement evaluation.