I know that typical values for connate water saturation are anywhere from 15-30%. However, I've seen some people using 3-6% initial Sw in their reserves calculations. This seems very low to me. The reserves predictions are in very clean, 1-2 Darcy rock. Is this value too low? They say that...
I have a quick spreadsheet that calculates static BHP from SITP using the Cullender & Smith method.
Email me @ ryanguillory@hotmail.com
if you want it.
It's not good to use seawater for workover operations b/c the barium in the seawater will mix with the sulfate in the formation water to form scale. This happend to us on a well a few months ago. We spent all kind of money on this new chemical BJ has to dissolve the scale.
This is often called "mud acid" or "clay acid". We used it sometimes when we are encountering a real shaly sand with a lot of damage. Most people try to stay away from it b/c it often causes upsets with the processing system.