Near-miscible supercritical <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e911" altimg="si56.svg"><mml:msub><mml:mrow><mml:mi mathvariant="normal">CO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> injection in oil-wet carbonate: A pore-scale experimental investigation of wettability state and three-phase flow behavior

Near-miscible supercritical CO2 (scCO2) injection and its underlying pore-scale physics were experimentally investigated in an oil-wet carbonate rock at elevated temperature and pressure conditions using X-ray microtomography. The results of in situ contact angle measurements yielded direct evidence showing that the scCO2 injection triggered a wettability reversal process resulting in reduced oil-wetness. As the scCO2 injection progressed, we...