The Discovery of Calcite Intrinsic Wettability by the First-Ever Optical Illumination Inside Dark Fluid using IRIDW Apparatus

Wettability is one of the critical physical-chemical properties controlling multiphase flow in porous media. Therefore, it is vital to identify the wettability for each rock type when building 3D geological models for predicting the fluid flow behavior using a numerical simulator. Wettability-unique relative permeability curves are part of each flow simulator's rock type for proper simulation predictions. The reference approach for wettability determination is contact angle measurement. The literature recoded the wettability of contact angle measurement inside transparent fluid like water and decane. However, we need to visualize and measure the water-rock contact angle inside dark fluid like the hydrocarbon. We propose visualizing and measuring the wettability contact angle for rock-water inside dark hydrocarbon fluid. We use the Illumination through Rock Inside Dark fluid for Wettability measurement (IRIDW) apparatus.