含疏水长链烷烃和亲水聚醚长链段单体结构单元的两亲驱油聚合物
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中海油能源发展科研项目“油水响应聚合物产品研发与应用”(项目编号HFKJ-ZX-GJ-2022-03-02)


An Amphiphilic Oil Displacement Polymer Containing Hydrophobic Long-chain Alkanes and Hydrophilic Polyether Long-chain Monomer Structural Units
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    摘要:

    为提高聚合物驱油剂的耐温耐盐和抗剪切性能,采用自由基水溶液聚合,以丙烯酰胺(AM)、丙烯酸(AA)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)和自主研发的长链烷基聚醚类两亲功能单体(POM)为原料,以低温引发的方式合成了两亲驱油聚合物(HAP),通过测定合成聚合物的特性黏数和增黏性确定了最佳合成条件,研究了HAP的溶解性、增黏性、抗剪切性、耐盐性、稳定性和驱油性能,并与市售耐温抗盐聚丙烯酰胺进行比较。结果表明, HAP的最佳合成条件为:单体总质量分数为 20%,POM加量为单体总质量的0.4%~0.8%,AMPS加量为8%,引发剂加量为单体总质量的 0.1%~0.4%,引发温度为 0 ℃。HAP 具有较好的溶解性和增黏性。0.175 g HAP 在75 ℃ 100 g模拟渤海海水中的溶解时间为30 min,溶液的表观黏度为55.8 mPa·s。在75 ℃下,0.175% HAP的抗剪切性、耐盐性、稳定性和驱油效果较好。随着剪切速率从 7.34 s-1 增至 100 s-1,HAP 溶液的黏度保留率为27.8%;在模拟海水矿化度增至30 g/L 时,HAP溶液的黏度为75 mPa·s;老化90 d后,HAP溶液的黏度为36 mPa· s;岩心驱替实验中,0.175% HAP溶液的最终采收率比相同浓度的市售耐温抗盐聚丙烯酰胺高8.8百分点。四元共聚物HAP表现出良好的溶解性、增黏性、抗剪切性、耐盐性、长期耐温稳定性和较高的原油采收率,性能优于市售耐温抗盐聚丙烯酰胺。

    Abstract:

    In order to improve the temperature,salt and shear resistance of polymer oil displacement agents,an amphiphilic oil displacement polymer (HAP) was synthesized by free radical aqueous solution polymerization and low temperature induced methods,using acrylamide(AM),acrylic acid(AA),2-acrylamide-2-methylpropanesulfonic acid(AMPS),and independently developed long-chain alkyl polyether amphiphilic functional monomer(POM)as raw materials. The optimum reaction condition was determined by examining the intrinsic viscosity and viscosity enhancement of HAP. The solubility,viscosity enhancement, shear resistance,salt resistance,long-term stability,and oil displacement performance of HAP were studied,and then compared with those of commercially available temperature and salt resistant polyacrylamide. The results showed that the optimum synthesis condition for HAP was obtained as follows:20% total monomer mass fraction,0.4%—0.8% POM dosage of total monomer mass, 8% AMPS,0.1%—0.4% initiator,and 0 ℃ initiation temperature. 0.175% HAP solution was prepared by simulating Bohai Sea seawater. The dissolution time of HAP was 30 minutes at 75 ℃,and then the apparent viscosity was 55.8 mPa s. At 75 ℃,0.175%HAP exhibited good shear resistance,salt resistance,stability and oil displacement effect. The viscosity retention rate of HAP solution was 27.8% when the shear rate increased from 7.34 s-1 to 100 s-1. When the salinity of simulated seawater increased to 30 g/L,the viscosity of HAP solution was 75 mPa s. After aging at 75 ℃ for 90 days,the viscosity of HAP solution became 36 mPa s. The core displacement experiment results showed that the final recovery rate of 0.175% HAP solution was 8.8 percentage points higher than that of commercially available polyacrylamide with temperature and salt resistance. The synthesized quaternary copolymer HAP exhibited excellent solubility,viscosity enhancement,shear resistance,salt resistance,long-term temperature stability,and high crude oil recovery rate,with better performance than commercially available temperature and salt resistant polyacrylamide.

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张 静,陈 斌,苏延辉,王 滨,康 蕾,刘观军,徐 浩,吴晓燕.含疏水长链烷烃和亲水聚醚长链段单体结构单元的两亲驱油聚合物[J].油田化学,2024,41(4):632-639.
ZHANG Jing, CHEN Bin, SU Yanhui, WANG Bin, KANG Lei, LIU Guanjun, XU Hao, WU Xiaoyan. An Amphiphilic Oil Displacement Polymer Containing Hydrophobic Long-chain Alkanes and Hydrophilic Polyether Long-chain Monomer Structural Units[J]. OILFIELD CHEMISTRY,2024,41(4):632-639.

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