[blam]

"...or even some sort of heavier petroleum based mud."

Loaded with bacteria, germs and etc.

[MeanWestTexan]

"Loaded with bacteria, germs and etc."

1. I would prefer a lighter brine (salt water)
2. No, you can make it very caustic (or whatever) and eliminate the bacteria, germs, etc.

Or just boil it under pressure.