Quantifying the impact of surface roughness on contact angle dynamics under varying conditions

Despite extensive research in recent years to clarify the role of fluid composition on reservoir wettability, understanding the properties of rock and its solid surface characteristics and their effects on wettability and its alteration remains limited and requires further investigation. This study utilized sandpaper with different roughness levels to examine the effect of roughness on the contact angles of n-heptane, crude oil (CO), brine, and deionized water (DW) with solid surfaces. In a DW-air-solid system, the measurements indicate that increasing the surface roughness beyond a certain point decreases the surface's affinity for the fluid. A similar trend was observed with the brine, although the contact…