# Theoretical Residue Gas

## Definition - What does Theoretical Residue Gas mean?

Theoretical Residual Gas is the volume of residual gas that theoretically remains in each well completion and/or for gas plants after taking into consideration the losses/consumption for shrinkage, plant fuel and plant vent/flare. In order to calculate the Theoretical Residue Gas remaining, the sum total of gaseous components is measured in MMBTU (equivalent of 1 million British Thermal Units) and is determined by chromatographic analysis.

## Petropedia explains Theoretical Residue Gas

The following are the steps which are used to calculate the Theoretical Residual Gas remaining in a well:

- The recovered natural gas liquid volumes are converted into equivalent gas volumes in MMBTU.
- Gas consumption in terms of plant fuel and gas flare is then converted into equivalent gas volumes in MMBTU. These are recorded by the plant operator.
- Theoretical Residual Gas Remaining is then calculated by subtracting the sum total of point 1 and point 2 from the wet gas equivalents (in MMBTU).