Free Gas 1 : Gas produced from the gas cap of an oil reservoir. Different from solution gas in that free gas has not been dissolved in produced liquids but exists as a separate and distinct substance in the reservoir. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}