β-环糊精功能化聚丙烯酰胺纳米复合材料的制备及其在提高采收率中的应用

Preparation of β-Cyclodextrin Functionalized Polyacrylamide Nanocomposite and Its Application in Enhanced Oil Recovery

实验条件下,用马来酸酐对β-环糊精进行了改性。以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙烷磺酸(AMPS)和改性β-环糊精(MAH-β-CD)为原料,采用自由基聚合法合成了一种新型水溶性纳米复合材料(AAMC-S1)。在性能评价实验中,与聚合物AM/AMPS/MAH-β-CD(AAMC-S0)相比,AAMC-S1纳米复合材料在增稠性、耐温性、耐盐性和抗剪切性等方面表现良好。无机纳米Si O_(2)的引入使AAMC-S1结构具有刚性,其网络结构更加致密。基于室内驱替试验,AAMC-S1纳米复合材料的阻力系数(RF)为22.31,残余阻力系数(RRF)为5.58,而AAMC-S0的阻力系数及余阻力系数为17.71和2.73。提高采收率试验表明,AAMC-S1可显著提高原油采收率13.25%,而AMC-S0仅为7.12%。

Cyclodextrin was successfully modified by maleic anhydride under certain experimental conditions.A novel water-soluble nanocomposite(AAMC-S1)consisting of nano-SiO_(2) was synthesized by free-radical polymerization using acrylamide(AM),2-acrylamido-2-methyl propane sulfonic acid(AMPS)and modified b-cyclodextrin(MAH-β-CD)as raw materials.In the performance evaluation experiments,the AAMC-S1 nanocomposite demonstrated desirable properties in terms of its thickening ability,temperature resistance,salt tolerance and shear resistance compared to those of the pure polymer AM/AMPS/MAH-β-CD(denoted AAMC-S0).Desirable properties could be attributed to the introduction of inorganic nano-SiO_(2),which endowed the AAMC-S1 structure with rigidity and made the network structure denser and stronger.Based on the indoor displacement test,the AAMC-S1 nanocomposite gave a resistance factor(RF)of 22.31 and a residual resistance factor(RRF)of 5.58,compared with 17.71 and 2.73 for AAMC-S0.The enhanced oil recovery test showed that AAMC-S1 could remarkably enhance 13.25% of oil recovery while AAMC-S0 could enhance 7.12% of oil recovery.