[Eric in the Ozarks]

I understand they use steam to losen up heavy oil deposits in the Edmonton area. Don't think the H2O is a replacement or "filler."

[Guillermo]

There was/is a FReeper who was involved in water injection in Kuwait at least a few years back.

Don't remember his handle, but he went under "Caiaphas" in the FR chat room.

This was just what he told me. I guess they use different methods depending on location, geology, etc.