An Experimental Study of Enhanced Oil Recovery EOR Using a Green Nano-Suspension

摘要

In this work, a novel nano-suspension (NS), which was mainly composed of a surface functionalized nano- cellulose, was successfully developed for "green" chemical EOR use. The rheological analysis indicated that this NS was a pseudo-plastic (shear-thinning) fluid and presented noticeable viscoelasticity. The oil displacement behaviors of this NS were thoroughly examined using core flooding methods. The EOR efficiency dependence of the NS on permeability, oil viscosity and injected volume was included. The experimental results showed that the NS flooding (NSF) further improved the oil recovery by 3-17% on the basis of water flooding. Furthermore, micro flow tests were conducted in a visual micro-model to study its flow behaviors in porous media and EOR mechanisms. Through the micro-model, the displacement behaviors and mechanisms including emulsification, dragging/squeezing and wettability alteration, were visually observed. These properties promise this NS as a green displacement agent for chemical EOR.