Preference of nanoporous graphene to Single-Walled Carbon Nanotube (SWCNT) for preparing silica nanohybrid Pickering emulsion for potential Chemical Enhanced Oil Recovery (C-EOR)

We prepared nanoporous graphene/silica nanohybrid and demonstrated its better pickering emulsion properties for chemical enhanced oil recovery in comparison to the similar silica nanohybrid with a single-walled carbon nanotube. the samples were characterized with x-ray diffraction (xrd), field emission scanning electron microscopy (fe-sem), and thermal gravimetry analysis (tga). emulsion phase morphology was investigated with optical microscopic image. evaluation results demonstrated that the best samples are 70% nanoporous graphene/si02 (both methods) and 70% swcnt/si02 nanohybrid (method 1). contact angle measurement results showed that 70% nanoporous graphene/si02 nanohybrid (method 2) is more effective in the improvement of the stone reservoir wettability alteration from oil-wet to water-wet. interfacial tension results indicate that the maximum amount is related to the injection of water, and the minimum amount is related to the injection of nanofluid of 70% nanoporous graphene/si02 nanohybrid (method 2). this result indicates the preference of 70% nanoporous graphene/si02 nanohybrid (method 2) for decreasing the interfacial tension in comparison to the other samples.