Thanks for all that. Sounds like you know your stuff.
Are you in the field? Or did you just sleep at a Holiday Inn last night? That’s from a Holiday Inn TV commercial 10 or so years ago. :)
Co2 was ben tried before in the domestic market for aiding oil out of the ground, not necessarily fracing, mostly boosting these down holes pressures of wells.
There are lots of places in the USA where they extract the gas from the NG stream prior to putting into the PPL systems. When Co2 is used in heavier oils, the Co2 becomes entrapped in the oil. Then when transported to storage tanks it settles out after reacting with the water portion of the BS&W and creates carbonic acid.
Not good stuff for ordinary and typical carbon steel materials normally used in oil refining.
When this was identified years ago the oil producers had a very hard time selling their tainted oil, or is now sold to very few and at a heavy discount.
Oil field back in the 80’s.