The conditions under which oil or gas phases exist are a matter of considerable practical importance. The experimental or the mathematical determinations of these conditions are conveniently expressed in different types of diagrams commonly called phase diagrams. One such diagram is called the pressure-temperature diagram.Figure shows a typical pressure-temperature diagram of a multicomponent system with a specific overall composition.
These multicomponent pressure-temperature diagrams are essentially used to:
- Classify reservoirs
- Classify the naturally occurring hydrocarbon systems
- Describe the phase behavior of the reservoir fluid
