【摘要】 海上油田聚合物驱配液过程产生的微纳米气泡氧化降解会造成聚丙烯酰胺（HPAM）黏度损失。分析了不同充气条件下HPAM溶液黏度保留率的变化规律，并结合动态激光散射、生物显微镜、红外光谱等技术研究了驱配液过程中微纳米气泡对HPAM溶液结构的影响。结果表明，以空气为气源，用微纳米气泡发生器循环20min后的模拟矿化水配制的HPAM溶液黏度保留率下降幅度最大，黏均相对分子质量也最低。这是由于氧气与溶液中的HPAM分子发生化学反应，出现了氧化降解现象，含有空气的微纳米气泡增大了溶液中氧气的溶解度并产生了羟基自由基（·OH），导致黏度保留率降低；不充气时，由于机械剪切作用HPAM溶液在配制过程中也会产生微纳米气泡，但溶液质量浓度过大，不利于微纳米气泡的分散，从而减缓了黏度保留率的降低幅度；微纳米气泡在溶液中的稳定时间比大气泡更长，且会影响聚合物的粒径分布，使其平均粒径增大，粒径分布不均匀。更多还原

【Abstract】 During the injection process, micro-nano bubbles are generated in the oil-displacing agent polyacrylamide(HPAM)system. This will lead to the oxidative degradation of HPAM and the loss of viscosity. In order to determine the effect of micronano bubbles on the change rule of the viscosity retention rate and structure of HPAM solution, the viscosity retention rate at different aeration conditions was studied, and technologies such as dynamic laser scattering, biological microscopy, and infrared spectroscopy were carried out. Results showed that the viscosity retention rate of HPAM sample, which was prepared with simulated mineralized water after 20 mins circulation of the micro-nano bubbles generator with air as the gas source, decreases the most, and its viscosity average molecular weight is also the lowest. This is attributed to the chemical reaction between oxygen and HPAM molecules in the solution, leading to oxidative degradation. The micro-nano bubbles containing air increase the solubility of oxygen in the solution and generate hydroxyl radicals(·OH), thereby reducing the viscosity retention. In the absence of inflation,micro-nano bubbles are formed in the HPAM solution during the preparation process due to mechanical shear, but the high concentration of the solution hinders the dispersion of micro-nano bubbles, thereby slowing down the decrease in viscosity retention. In addition, micro-nano bubbles have a longer stabilization time in solution than large bubbles, and will affect the particle size distribution of the polymer, resulting in uneven particle size distribution and larger average particle size.更多还原