提输卤管道用减阻剂的合成、表征及其性能

为了降低深层卤水提输过程的能耗,开展耐温耐盐的提输卤管道用减阻剂研究具有重要的现实意义。以丙烯酰胺(AM),2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和丙烯酸(AA)为单体,采用氧化还原引发剂体系水溶液聚合法合成耐温耐盐的提输卤管道用减阻聚合物P(AM/AMPS/AA)。以聚合物在常温卤水管道中的减阻率为考核指标,设计四因素三水平正交试验,确定最佳合成条件为:反应系统pH为1,反应温度为30℃,单体质量配比为m(AM)∶m(AM PS)∶m(AA)=15∶3∶2,引发剂加入质量为单体总质量的0.04%。根据在线红外分析结果确定最佳反应时间为3 h。利用FTIR和1H NM R等手段对P(AM/AM PS/AA)的结构进行表征并用多角激光光散射仪测定其分子量。在自制的减阻率测试环道上对合成聚合物的减阻性能进行测试,合成聚合物表现出较好的耐温耐盐性能,减阻效果明显。如在模拟卤水质量浓度150 g/L、水温15℃、流量950 L/h、减阻剂用量为20 mg时,合成减阻聚合物的减阻率可以达到41.2%。与现有减阻剂相比,合成的P(AM/AMPS/AA)减阻聚合物减阻性能大幅度提高,具有较好的开发应用前景。

Preparation,characterization and performance of drag reduction agent used in pipeline of brine mining and transportation

In order to reduce the energy consumption of the deep brine extraction process, the research on heat resistance and salt tolerance of halogen pipeline drag reduction agent has important practical significance. The synthesis of P(AM/AMPS/AA)adopted redox system by initiated acrylamide(AM)and 2-acrylamide-2-methyl-1-propanesulfonic acid(AMPS)and acrylic acid(AA)in aqueous solution was studied. The optimum experimental conditions were obtained by orthogonal experimental design and online reaction infrared spectrogram. The optimum conditions were as the followings, temperature was 30 ℃, pH value was 1, the monomer mass ratio was 15∶3∶2, the initiator concentration was 0.04%, and the optimized reaction time was 3 h.The structure of P(AM/AMPS/AA)was characterized by FTIR and 1H NMR, and the molecular weight was tested by MALLS. The drag reduction performance of the synthetic polymer was tested on a self-made test pipeline, and the polymer showed better heat resistance and salt resistance, and the drag reduction effect was obvious.When the simulation of brine salinity was 150 g/L, the water temperature was 15 ℃, the flow rate was 950 L/h, the dosage was 20 mg, the polymer drag reduction rate could reach 41.2%. Compared with the existing drag reducing agent, the drag reduction performance was greatly improved, which would have good development and application.