Understanding the phase diagram will help to:
- Classify reservoirs
- Classify naturally occurring hydrocarbon systems
- Describe the phase behavior of the reservoir fluid.
Cricondentherm – the maximum temperature above which liquid cannot be formed regardless of the pressure.
Cricondenbar – the maximum pressure above which n gas can be formed, regardless of the temperature.
Critical Point – this is the state of temperature and pressure at which all intensive properties of the gas and liquid phases are equal.
Phase envelope – the region wherein gas and liquid co-exist in equilibrium. The region enclosed by the dew and bubble point curve.
Quality Lines – these describe the pressure and temperature conditions for equal volume of liquids. All such lines converge at the critical point.
Bubble Point curve – the line separating the liquid phase region from the two phase region.
Dew Pont curve – the line separating the vapour phase region from the two phase region.