Manipulation of star-like polymer flooding systems based on their comprehensive solution properties and flow behavior in porous media

摘要

In this study, novel star-like polymers (SLPs) with four-gradient molecular weight (M-w), consisting of nano-silica as the core and a layer of hydrophilic chains as the shell, were fabricated via mild water free-radical polymerization. The comprehensive properties of SLP flooding systems prepared with brine were investigated to elucidate their underlying applications by combining static measurements, filterable tests, two-serial cores displacement experiments, and polymer flooding tests for enhanced oil recovery (EOR). The specific injectivity index was proposed, for the first time, to demonstrate the flow behavior of SLP solutions in conglomerate rocks.