三元复合驱室内物理模拟实验研究——天然岩心与人造岩心的差异

Laboratory Physical Simulation Experiment of ASP Flood- ing-Difference Between Natural and Artificial Core

在三元复合驱室内物理模拟实验中,选取两种相对分子质量(1 200×104和2 000×104)的聚合物以及两种岩心(人造岩心和天然岩心).研究了三元复合体系注入段塞大小和注入前置及后续段塞大小等不同注入方式对驱替效果的影响.实验结果表明,使用不同相对分子质量聚合物配制的三元体系,其高浓度小段塞比低浓度大段塞的驱油效率高,而且高相对分子质量聚合物驱比低相对分子质量聚合物驱效果的差别更明显;在注入方式相同的条件下,人造岩心的驱油效果优于天然岩心;随着化学剂用量的降低,这种差异会更大.

In this paper a series of laboratory physical simulation experiments are conducted to study the effect of the slug size ( including the main slug, prepositive slug and protective slug) on displacing efficiency in ASP flooding. Two polymers and two types of core (nature core and synthetic core) are chosen in this study. The results show that the high concentration (small slug) is better than the low concentration (large slug) , and the difference is larger when the polymer of higher molecular weight is used. When the injection mode is same, the numerical value of EOR (enhanced oil recovery by ASP flooding) on synthetic core is higher than that on nature core, the difference would enlarge as the amount of chemical is decreased.