水包水型疏水缔合聚丙烯酰胺增稠剂的合成及在压裂中的应用

发布时间：2018-10-25 19:15

【摘要】：以丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸和芥酸酰胺羟丙基磺基甜菜碱为原料,采用水分散聚合方式合成出水包水型疏水缔合聚丙烯酰胺增稠剂,通过FTIR和TG对增稠剂的结构及热解质量进行了测试。分析了OWPAM乳液增稠剂的基本性能及水溶液的微观和宏观性能,结果表明,在单体芥酸CAB用量为4.0%时,乳液的产率、平均粒径、表观黏度和稳定性达到最优,黏均分子量为2.43×10~6g/mol;OWPAM乳液的临界胶束缔合浓度(CAC)值为0.32%,当浓度大于CAC值后水溶液体系内的缔合形式以分子间缔合为主,OWPAM乳液在0.1%、流速10m/s时减阻率为72%。助黏剂TR-1质量分数为1.0%时可将0.5%水溶液黏度增加至160mPa·s,复配成的压裂液具有较好耐温耐剪切性、黏弹性和悬砂性,在APS质量分数为0.05%时,测试时间为2h压裂液可以完全破胶,能够达到压裂液的使用标准。
[Abstract]:Hydrophobically associating polyacrylamide thickener was synthesized from acrylamide, 2-acrylamide 2-methylpropanesulfonic acid and erucide-aminohydroxypropyl sulfobetaine by water dispersion polymerization. The structure and pyrolysis quality of thickener were tested by FTIR and TG. The basic properties of OWPAM emulsion thickener and the microcosmic and macroscopic properties of aqueous solution were analyzed. The results showed that the emulsion yield, average particle size, apparent viscosity and stability were optimal when the amount of erucic acid CAB was 4.0. The viscosity average molecular weight is 2.43 脳 10 ~ (-1) g / mol; The critical micelle association concentration (CAC) of OWPAM emulsion is 0.32. When the concentration is higher than CAC value, the main form of association in aqueous solution is intermolecular association. The OWPAM emulsion is 0.1 and the drag reduction rate is 72 when the flow rate of 10m/s is 10m/s. The viscosity of 0.5% aqueous solution can be increased to 160mPa s when the mass fraction of TR-1 is 1.0. The composite fracturing fluid has good temperature and shear resistance, viscoelasticity and suspending sand. When the mass fraction of APS is 0.05, The test time is 2 h, the fracturing fluid can break completely, and it can reach the standard of fracturing fluid.
【作者单位】：教育部轻化工助剂化学与技术重点实验室陕西科技大学;陕西延长石油(集团)有限责任公司研究院;
【基金】：国家科技重大专项项目(2017ZX05039004、ycsy2017QNJJB-08)
【分类号】：TE39

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