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利用动态光散射(DLS)、电镜扫描(SEM)和岩心驱替实验等方法,对高温高矿化度条件下聚合物溶液和“聚合物/表面活性剂”二元复合驱油体系中聚合物分子线团尺寸及其影响因素和在中低渗油藏环境下的渗流特性进行了实验研究,并对其渗流规律进行了机理分析.结果表明,在高温高矿化度条件下,随聚合物浓度增加,聚合物溶液和“聚合物/表面活性剂”二元复合驱油体系中聚合物分子线团尺寸Dh都呈现“先增大后减小”的变化规律.非离子型表面活性剂以胶束聚集体形式吸附在聚合物分子链上,造成二元复合驱油体系中聚合物分子线团尺寸Dh大于聚合物溶液.在溶剂水矿化度较高和岩心渗透率较低条件下,后续注入水的冲刷和稀释作用造成岩心内滞留聚合物浓度降低,聚合物分子线团尺寸Dh增加,最终导致聚合物溶液和“聚合物/表面活性剂”复合体系的残余阻力系数大于阻力系数.
The influences of high temperature and high salinity on the polymer solution and the “polymer / surfactant” binary compound flooding system were investigated by dynamic light scattering (DLS), electron microscopy (SEM) and core flooding experiments. The molecular size of the polymer and its influencing factors and the seepage characteristics under the condition of medium and low permeability reservoirs were studied experimentally and the mechanism of seepage flow was analyzed.The results show that under the conditions of high temperature and high salinity, The concentration of polymer increases, the polymer molecular coil diameter Dh in polymer solution and polymer / surfactant / binary composite flooding system shows the variation law of “first increase then decrease” The ionic surfactant adsorbed on the molecular chain of the polymer as micellar aggregates resulted in the polymer molecular coil diameter Dh greater than the polymer solution in the binary composite flooding system.When the solvent water has a high salinity and core penetration At lower rates, flushing and dilution of the subsequent injection of water resulted in a decrease in the concentration of retained polymer in the core and an increase in the molecular size of the polymer molecule, Dh, which eventually led to the polymer solution and polymer / surfactant composite system The residual resistance coefficient is greater than Coefficient.