部分水解聚丙烯酰胺水动力学尺寸测定的影响因素分析及其应用

Influence Factors and Their Application in Determination of Hydrodynamic Size of Partially Hydrolyzed Polyacrylamide

应用微孔滤膜法对部分水解聚丙烯酰胺(HPAM)水动力学尺寸进行测定。考察过滤压力、HPAM质量浓度、HPAM相对分子质量、配液用水及机械剪切作用等因素对HPAM水动力学尺寸的影响。实验结果表明,当过滤压力为0.08 MPa时,随HPAM相对分子质量的增大,HPAM质量浓度的增加,HPAM水动力学尺寸增大;配液用水矿化度越高,HPAM水动力学尺寸越小;当HPAM质量浓度较低时,机械剪切作用对于HPAM水动力学尺寸降低的影响尤为明显。水动力学尺寸可作为判断驱油体系与孔喉匹配性的基础,指导油田聚合物驱方案的优化设计。

The hydrodynamic size of partially hydrolyzed polyacrylamide（HPAM） was determined by the microporous membrane method. The influences of filtration pressure, mass concentration of HPAM, its relative molecular mass, injected water or reinjected wastewater, and shearing strength on the hydrodynamic size were investigated. The results indicated that, when filtration pressure was 0.08 MPa, the HPAM hydrodynamic size increased with increasing the relative molecular mass and concentration of the HPAM. The higher the salinity of the injected water and reinjected wastewater, the smaller the HPAM hydrodynamic size. The mechanical shearing action had obviously effect on the hydrodynamic size of HPAM with low concentration. The hydrodynamic size can be used as a basis for the judgment of the fit between polymer flooding and pore throat, which can guide the optimization design of oilfield polymer flooding projects.