海上油田开发用抗温抗盐乳液聚合物研制与性能评价  

Development and Performance Evaluation of Emulsion Polymer with Temperature Resistance and Salt Resistance Used in Offshore Oilfield Development

作　　者：杨开吉 张颖 魏强[1,2] 程艳 刘全刚[2] YANG Kaiji;ZHANG Ying;WEI Qiang;CHENG Yan;LIU Quangang(CNOOC(Tianjin)Oilfield Chemical Co.,Ltd.,Tianjin,300450,China;CNOOC EnerTech-Drilling&Production Co,Tianjin,300459,China)

机构地区：[1]中海油(天津)油田化工有限公司,天津300450 [2]中海油能源发展股份有限公司工程技术公司,天津300452

出　　处：《石油钻探技术》2024年第4期118-127,共10页Petroleum Drilling Techniques

基　　金：海油发展重大专项“高分子量阳离子乳液聚合物清水剂的开发与应用”(编号:E-J822A008)资助。

摘　　要：为满足海上油田开发对聚合物溶解速度、抗温和抗盐性能的要求,使用自制的高效聚合物乳化剂和热稳定剂,采用低温复合引发体系多段引发,制备了超高相对分子质量的速溶抗温抗盐型乳液聚合物,分析了制备工艺,助溶剂、功能单体和热稳定剂加量对聚合物性能的影响。结果表明,通过工艺优化可制备得到相对分子质量2200万~2400万的聚合物,尿素和硫酸钠可显著提高超高相对分子质量抗温抗盐乳液聚合物的溶解速度;聚合时添加N,N-二甲基丙烯酰胺、自制热稳定剂和2-丙烯酰胺-2-甲基丙磺酸钠,可显著提高聚合物的抗温抗盐性能。采用电镜、激光粒度仪、GPC和TGA等方法,评价了超高相对分子质量抗温抗盐型乳液聚合物的结构及性能,结果表明,制备的聚合物乳胶粒粒径分布均匀、相对分子质量分布窄和耐温性能好,在矿化度35000 mg/L、温度75℃条件下,乳液聚合物30 d的黏度保留率大于90%。研究表明,超高相对分子质量抗温抗盐型乳液聚合物具有速溶、相对分子质量高和抗温抗盐性能好的特点,可以用于海上油田驱油开发。In order to meet the demand for rapid dissolution,temperature resistance,and salt resistance of polymers in offshore oilfield development,the emulsion polymer with ultra-high relative molecular weight,rapid dissolution,temperature resistance,and salt resistance was prepared by low-temperature composite initiation system using self-made high efficient polymer emulsifier and heat stabilizer.In addition,the effects of the preparation process,cosolvent amount,functional monomer amount,and heat stabilizer amount on the performance of polymers were studied.The results show that the polymers with a relative molecular weight of 22–24 million can be obtained through process optimization.Urea and sodium sulfate can significantly improve the dissolution rate of the emulsion polymer with ultra-high relative molecular weight,temperature resistance,and salt resistance.Adding N,N-dimethylacrylamide,self-made heat stabilizer,and sodium 2-acrylamide-2-methylpropane sulfonate during polymerization can significantly improve the temperature resistance and salt resistance of the polymer.The structure and properties of the emulsion polymer with ultra-high relative molecular weight,temperature resistance,and salt resistance were characterized by electron microscopy,laser particle analyzer,gel permeation chromatography(GPC),and thermogravimetry(TGA).The results indicated that the prepared polymer has uniform emulsion particle distribution,narrow relative molecular weight distribution,and good temperature resistance.The viscosity retention rate of the emulsion polymer within 30 days was more than 90%at a salinity of 35000 mg/L and temperature of 75°C.The results reveal that the emulsion polymer with ultra-high relative molecular weight,temperature resistance,and salt resistance has the characteristics of rapid dissolution,high relative molecular weight,and good temperature resistance and salt resistance and can be widely used in offshore oilfield development by oil displacement.

关 键 词：海上油田 反相乳液聚合 聚合物 驱油 热稳定性 抗盐特性 

分 类 号：TE357.461[石油与天然气工程—油气田开发工程]