Just replying to a private message received below - so that others may benefit

ECLIPSE help needed!
Dear vinomarky,

I read from the forums that you are quite knowledgable in ECLIPSE..

i need some help here i am a student doing a project in reservoir modelling using ECLIPSE..

the objective of my project is to generate the capillary pressure vs saturation curves and analyze its behavior during imbibition and drainage in IWAG.

can you guide me on how to obtain this output curve?

thank you so much for your help!

Sincerely,

Ivan.
I have never had cause to use imbibition curves, so can not offer a whole lot of help unfortunately. I can, however offer some thoughts as to why they are so rarely used.
(1) Cap pressure curves exhibit hysteresis - that is, the plot of imbibition depends upon where you started from on the drainage curve. Consequently, to map out a robust set of imbibition curves requires quite a few tests starting from different levels of initial saturation. Add into this the fact that if you simply use one core and perform drainage, imbibition, drainage, you'll end up with different drainage curves - and you start to understand that actually measuring the data to create the imbibition curves is difficult if not impossible. You'd have to use a number of cores, each with similar properties and perform successive imbibition tests from different drainage saturation points.
(2) The effects of rel perm shape often outweigh/mask imbibition capillary pressure effects

I'd be interested to hear from the rest of the community - have you had cause to use imbibition curves? did you notice a significantly different outcome over what you'd have achieved with a slightly different shaped rel perm curve anyway?