Research progress of nanomaterials for oil displacement in enhancing oil recovery
Due to the increasing demand for oil resources and the growing challenges associated with extraction,the field of enhanced recovery technology requires continuous innovation.Nanomaterials represent a promising type of material with unique properties resulting from their nano-scale dimensions and distinct grain boundary structure.These properties afford nanomaterials significant potential for use in enhanced oil recovery applications.This paper provided a systematic review of the mechanisms by which nanomaterials improved chemical recovery,including the reduction of surface/interfacial tension to increase the number of capillaries,contribution to structural separation forces for oil stripping from rock surfaces at a microscopic level and enhancement of wettability to improve water seepage and absorption.Improving the stability of emulsions and foams would in turn enhance the stability of the system.Increasing the ratio of flow rate would improve volumetric wave efficiency.Asphalt deposition could be inhibited with catalytic asphalt decomposition,which prevented pore clogging and reduced formation damage.Particle transportation could also be inhibited,which reduced formation damage.Cases of nanomaterials were cited as means to enhance oil recovery in low permeability reservoirs,thick oil reservoirs and reservoirs with high water content.And challenges in the large-scale use of such materials in oilfields were identified.
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