What is the term for a gas that remains a vapor in the reservoir and does not drop out as a liquid under separator conditions?

• A. Wet gas
• B. Dry gas
• C. Retrograde gas
• D. Condensate gas

Answer: (B)

The gas remains in vapor form at separator conditions, which is described by the term dry gas. In gas processing, liquids condense out of the gas only if the gas crosses its dew point at the given pressure and temperature. If the reservoir gas stays above that dew point under separator conditions, no liquids drop out and the output is essentially free of condensates. That contrasts with wet gas, which contains condensable hydrocarbons that do drop out as liquids in the separator; retrograde gas refers to gas condensing into liquids inside a condensate reservoir when pressure changes, not at surface separation; and condensate gas typically implies production with liquid condensate present. So the best fit for a vapor that doesn’t drop out as liquid is dry gas.