Phase Diagram

Understanding the phase diagram will help to:

  • Classify reservoirs
  • Classify naturally occurring hydrocarbon systems
  • Describe the phase behavior of the reservoir fluid.

 

phasediagram.PNG

Phase Diagram

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.

 

 

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