Foamy Oil Formation by Gas Injection and the Effect on Heavy Oil Recovery.

In this study, produced natural gas reinjection process is proposed to form renewed foamy oil for heavy oil recovery. A new experimental procedure was developed to prove that an in situ foamy oil could be formed during the gas injection process. A field scale numerical study was performed to further analyze foamy oil behavior and its influential mechanisms. The study showed that natural gas huff-n-puff process could increase heavy oil recovery by inducing foamy oil. The findings of this study could be useful to solve the problem of disappearance of foamy oil mechanism. [ABSTRACT FROM PUBLISHER]