二元复合驱采出液性能变化规律实验研究

针对辽河油田锦16块实施无碱二元复合驱采出液回注的问题，通过室内驱替实验模拟该区块实施二元复合驱的采出液，测定不同注入阶段采出液的聚合物质量浓度、表面活性剂质量分数、界面张力、黏弹性及流变性，研究二元复合驱采出液的性能变化规律。结果表明：采出液中聚合物质量浓度和表面活性剂质量分数随着注入孔隙体积倍数的增加而增加，注入0.54 PV时达到最大值，之后随着注入孔隙体积倍数的增加而降低；采出液的界面张力介于0．8～7．0mN／m；采出液具有一定的黏弹性；不同注入阶段的采出液表现出了剪切稀释性和剪切增稠性的流变规律。

Experimental study on performance variation law of produced fluid in binary combination flooding

Aiming at the reinjection problem of produced fluid implemented non-alkali binary combination flooding in Jin 16 biocek of Liaohe Oilfield, polymer concentration of the produced fluid, surfactant concentration, interfaeial tension, viscoelasticity and rheology at different injection stages are determined through the experimental simulation of laboratory displacement of produced fluid implemented hinary comhination flooding in the block. And performance change law of produced fluid in binary combination flooding is analyzed. The results show that the polymer concentration and surfaetaut concentration are increased with the increase of the injection pore volume in produced fluid, and that the concentration is up to maximal value when the injection pore volume reaches about 0.54 and that subsequently the concentration is deereased with the increase of injection pore volume. The interracial tension of produced fluid is between 0.8 and 7.0 mN/m. Produced fluid has certain viscoelasticity. The produced fluid shows the theological law of shear thinning and shear thickening at different injection phases.