ABSTRACT
The conditions in the reservoir will also change as a result of production. A reservoir fluid, which in the exploration phase was either single-phase gas or single-phase oil, may after some time of production split into two phases. The phase split is the result of material being removed from the reservoir. With more space available for the remaining reservoir fluid, the pressure will decrease and may after some time reach the saturation pressure, at which a second phase (gas or oil) starts to form.
