EN11.14.05 : Water-Oil-Solid Interfacial Interaction on Oil-Wet Nanotextured Surfaces

5:00 PM–7:00 PM Apr 5, 2018

PCC North, 300 Level, Exhibit Hall C-E

Qiaoyu Ge1 Hongxia Li1 Aikifa Raza1 TieJun Zhang1

1, Masdar Institute, Abu Dhabi, , United Arab Emirates

Effective oil removal from rock surface highly depends on the surface wettability and interfacial interaction among water, gas, oil and reservoir rock. Utilization of surface engineering, including morphology control, surface chemistry alteration and fluid infusion, has led to great advances in enhancing oil mobility. When a nanotextured surface is infused with a low surface tension oil (positive spreading coefficient), intrusive water droplets will be cloaked by the light oil layer and drag the oil along the injection fluid flow. In order to taking advantage of this cloaking-driving oil drainage mechanism, properly designed nanotextured surfaces are used in lab experiments to mimic reservoir rock and study microscopic oil displacement process. In this work, we investigate the effect of solid surface wettability and oil properties, including surface tension and viscosity, on water-oil-solid interfacial interactions through experiments in both optical microscopy and environmental scanning electron microscopy (ESEM). Different types of nanoparticles, such as calcined carbon-silica and calcium carbonate nanoparticles, are deposited on surfaces to tailor the wettability. These nanotextured surfaces are further infused by oil with different surface tensions and thus different spreading coefficients, causing different level of oil cloaking on water droplets. Thickness of the cloaking oil layer and emulsion flow rate are measured to quantify oil removal effectiveness. This study provides some fundamental insights into interfacial interaction among oil, gas, water and solid towards revealing pore-scale oil displacement mechanism.