纳微米聚合物颗粒分散体系微孔滤膜流动特征

Flow Characteristics of Nano/Micron-Sized Polymer Particles Aqueous Solution Through Microporous Membrane

为了评价纳微米聚合物颗粒分散体系在低渗透油藏中的流动特征,利用微孔滤膜模拟低渗透油藏的喉道,采用激光粒度仪和微孔滤膜过滤装置,对其流动特征及其影响因素进行了研究。结果表明:水化时间小于120 h时,聚合物颗粒的封堵作用较强;水化时间大于120h后,聚合物颗粒逐级调驱能力增强;随着压力差增大,聚合物颗粒储层深处逐级调驱的效果增强,压力差大于0.15 MPa后,逐级调驱效果增加的速度明显加快;随着滤膜孔径减小,聚合物颗粒过滤速度急剧降低,在0.45,0.80μm微孔滤膜上粒径为1.68μm聚合物颗粒具有很强的封堵能力,而在3.0μm微孔滤膜上具有较强的储层深部逐级调驱效果;随着聚合物颗粒浓度增加,储层深部逐级调驱效果变弱,颗粒浓度增至2.0 g/L后,聚合物颗粒已经没有深部逐级调驱的效果。

To evaluate percolation ability of aqueous dispersion system of nano/micron-sized polymer particles in low permeability reservoir,the flow characteristic and its influence factors are studied by laser particle size analyzer and filtration device of microporous membranes which are simulated as pore throat of low permeability reservoir.The results show that the nano/micron-sized polymer particles have stronger plugging effect in hydration time of less than 120 h.After hydration time of more than 120 h,deep profile control effect of nano/micron-sized polymer particles gradually increases.With increasing pressure difference,nano/micron-sized polymer particles have stronger deep profile control effect which increases faster after larger than pressure differentials of 0.15 MPa.When pore sizes of microporous membrane decrease,the filtration rate of polymer particles decreases rapidly.Therefore polymer particles with particle size of 1.68 μm have stronger plugging effect in the0.45,0.80 μm microporous membrane,but they have stronger deep profile control effect in 3.0 μm microporous membrane.The deep profile control effect of nano/ micron-sized polymer particles decreases with increasing particle concentration.After particles concentration increases to 2.0 g/L,the polymer particles already have no deep profile control effect.