耐温抗盐缔合聚合物的合成及性能评价

Synthesis and properties of heat-tolerance and salt-resistance hydrophobically associating water-soluble polymer

针对胜利油区三类油藏高温高盐的环境,采用胶束聚合法合成了一种耐温抗盐缔合聚合物HAWSP,研究了引发剂、表面活性剂、缔合单体DiC8AM物质的量分数及耐温抗盐功能单体AMPS-Na质量分数对HAWSP合成的影响,将其分子结构进行核磁共振氢谱表征,并对其溶液性能进行评价.HAWSP的最佳合成条件为：复合引发剂为Y4,表面活性剂为NS,DiC8AM物质的量分数为1.4％～1.6％,AMPS-Na质量分数为15％～17.5％.核磁共振氢谱证实HAWSP由AM,DiC8AM和AMPS-Na共聚而成.随着溶液中钙镁离子质量浓度的增加,HAWSP溶液的粘度保留率为55％～60％,而抗盐高分子质量聚合物PAM溶液的仅为30％～40％;在90℃高温下经120 d老化后,质量浓度为1 500mg/L的HAWSP溶液的粘度为15 mPa·s,而相同质量浓度的PAM溶液在老化时间超过60 d后产生沉淀,HAWSP的耐温抗盐、老化稳定和驱油性能明显优于PAM,原油采收率提高幅度也明显高于PAM,可用作三次采油驱油剂.

The heat-tolerance and salt-resistance hydrophobically associating water-soluble polymers is successfully synthesized bymeans of micellar copolymerization.The effects of initiator,solubilization surfactant,hydrophobic monomer and functional monomercontent on tackify performance are studied.A preliminary evaluation is done on the heat-tolerance and salt-resistance performance,the long-term stability performance and oil displacement performance.With the increase of the concentration of calcium and magne-sium ions in solution,the viscosity retention rates of HAWSP solutions are located in the range of 55%-60%,while the PAM's rates on-ly vary from 30% to 40%.After aging for 120 days at 90 ℃,the viscosity of HAWSP solution at the concentration of 1 500 mg/L is 15mPa·s,while the PAMisprecipitated after aging for more than 60 days.Theexperimental resultsshowthat theheat-toleranceandsalt-resistance copolymers have excellent viscous performance,long-term stability and good effect on oil displacement by using complex ini-tiatorY4,surfactantNS,hydrophobic monomer molarity at 1.4-1.6mol % and functional monomer AMPS-Na content of 15-17.5 wt%.