Fluids return due to Pressure changes

Have you ever asked by company man in location like this:
Company man : Cementer how much will the fluids return to your displacement tank ? will your displacement tank capacity enough to take it all ?
Cementer : Well we already talk about it don't we ? (good answer)
Cementer : Why should I know about it ? (bad answer)

If you don't know how much fluids will return back to your tank, and it is oil base mud which is can make spill to the environment ? that's the problem when your displacement tank unable to take it all, and its all spilled out from your cement unit
but that's not the point I want to share for this time, for some people fluids return sometimes neglect-able because they using water base mud that got no compressible factor, but for oil base mud which is compressible its differences cause they will have to turn its bubble, to common fluids when they got applied pressure. like picture below 


















Just like the old times lectures say "Refer to the fluids system, its divide into Bingham Plastic, Dilatation Fluids, which is different to one another to handle it, because they require pressure before they start to move from their static condition to mobile one....bla bla bla bla bla"

OK back to the topic, link below can help you to determine how much fluids return to your displacement tank after the displacement.

Determine Flow Back Volume to Surface

Hopes this share will help you