The processes of drainage and imbibition, which are manifested in capillary pressure curves, are fundamental to understanding how hydrocarbons move and are absorbed into the subsoil. Factors such as wettability, assessed through methods such as Amott's, and edge effects are important considerations in the interpretation of capillary pressure curves and reservoir modeling. The variability in capillary pressure, evidenced by hysteresis in the curves, as well as the influence of relative permeability, are crucial aspects in the characterization of reservoirs and in the application of reservoir models. In addition, average capillary pressure curves and their relationship to wettability are essential to understanding the efficiency of hydrocarbon recovery in a reservoir.