Physically based capillary pressure correlation for mixed-wet reservoirs from a bundle-of-tubes model

It is shown that the main characteristics of mixed-wet capillary pressure curves with hysteretic scanning loops can be reproduced by a bundle-of-triangular-tubes model. Accurate expressions for the entry pressures are employed, truly accounting for the mixed wettability and the diverse fluid configurations that arise from contact-angle hysteresis and pore shape. The simulated curves are compared with published correlations that have been Suggested by inspection of laboratory data from core plug experiments.